后端开发学习记录（四）——Mybatis的学习

滴水恩情 · 2022-9-16 17:21:15

Mybaits

Mybaits官方文档

官方文档mybatis – MyBatis 3 | Introduction
Mybaits

一、简介

Ⅰ什么是Mybaits

MyBatis 是一款优秀的持久层框架;
它支持自定义 SQL、存储过程以及高级映射。MyBatis 免除了几乎所有的 JDBC 代码以及设置参数和获取结果集的工作。MyBatis 可以通过简单的 XML 或注解来配置和映射原始类型、接口和 Java POJO（Plain Old Java Objects，普通老式 Java 对象）为数据库中的记录。
MyBatis本是apache的一个开源项目iBatis，2010年这个项目由apache software foundation迁移到了[google code](https://baike.baidu.com/item/google code/2346604)，并且改名为MyBatis。2013年11月迁移到Github。
iBATIS一词来源于“internet”和“abatis”的组合，是一个基于Java的持久层框架。iBATIS提供的持久层框架包括SQL Maps和Data Access Objects（DAOs）。
当前，最新版本是MyBatis 3.5.9，其发布时间是2021年12月26日。
如何获得Mybaits？
- Github源码下载Search · Mybaits (github.com)
- Maven仓库(手打)
  2. <mappers>
  3. <typeAliases>
  4. <typeAliases>
  5. <mappers>
  6. <mappers>
  7. <mappers>
  8. <settings>
  9. <setting name="logImpl" value="STDOUT_LOGGING"/>
  10. </settings><package name="com.Ji.dao"/>
  11. </mappers><mapper />
  12. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
  13. </mappers><package name="com.kuang.pojo"/>
  14. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
  15. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
  16. </mappers><dependency>
  17. <mappers>
  18. <typeAliases>
  19. <typeAliases>
  20. <mappers>
  21. <mappers>
  22. <mappers>
  23. <settings>
  24. <setting name="logImpl" value="STDOUT_LOGGING"/>
  25. </settings><package name="com.Ji.dao"/>
  26. </mappers><mapper />
  27. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
  28. </mappers><package name="com.kuang.pojo"/>
  29. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
  30. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
  31. </mappers><mappers>
  32. <typeAliases>
  33. <typeAliases>
  34. <mappers>
  35. <mappers>
  36. <mappers>
  37. <settings>
  38. <setting name="logImpl" value="STDOUT_LOGGING"/>
  39. </settings><package name="com.Ji.dao"/>
  40. </mappers><mapper />
  41. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
  42. </mappers><package name="com.kuang.pojo"/>
  43. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
  44. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
  45. </mappers><groupId>org.mybatis</groupId>
  46. <mappers>
  47. <typeAliases>
  48. <typeAliases>
  49. <mappers>
  50. <mappers>
  51. <mappers>
  52. <settings>
  53. <setting name="logImpl" value="STDOUT_LOGGING"/>
  54. </settings><package name="com.Ji.dao"/>
  55. </mappers><mapper />
  56. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
  57. </mappers><package name="com.kuang.pojo"/>
  58. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
  59. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
  60. </mappers><mappers>
  61. <typeAliases>
  62. <typeAliases>
  63. <mappers>
  64. <mappers>
  65. <mappers>
  66. <settings>
  67. <setting name="logImpl" value="STDOUT_LOGGING"/>
  68. </settings><package name="com.Ji.dao"/>
  69. </mappers><mapper />
  70. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
  71. </mappers><package name="com.kuang.pojo"/>
  72. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
  73. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
  74. </mappers><artifactId>mybatis</artifactId>
  75. <mappers>
  76. <typeAliases>
  77. <typeAliases>
  78. <mappers>
  79. <mappers>
  80. <mappers>
  81. <settings>
  82. <setting name="logImpl" value="STDOUT_LOGGING"/>
  83. </settings><package name="com.Ji.dao"/>
  84. </mappers><mapper />
  85. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
  86. </mappers><package name="com.kuang.pojo"/>
  87. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
  88. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
  89. </mappers><mappers>
  90. <typeAliases>
  91. <typeAliases>
  92. <mappers>
  93. <mappers>
  94. <mappers>
  95. <settings>
  96. <setting name="logImpl" value="STDOUT_LOGGING"/>
  97. </settings><package name="com.Ji.dao"/>
  98. </mappers><mapper />
  99. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
  100. </mappers><package name="com.kuang.pojo"/>
  101. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
  102. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
  103. </mappers><version>3.5.4</version>
  104. <mappers>
  105. <typeAliases>
  106. <typeAliases>
  107. <mappers>
  108. <mappers>
  109. <mappers>
  110. <settings>
  111. <setting name="logImpl" value="STDOUT_LOGGING"/>
  112. </settings><package name="com.Ji.dao"/>
  113. </mappers><mapper />
  114. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
  115. </mappers><package name="com.kuang.pojo"/>
  116. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
  117. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
  118. </mappers></dependency>
  复制代码

Ⅱ持久化

数据持久化

持久化就是将程序的数据在持久状态和瞬时状态转化的过程
内存：断电即失
数据库（Jdbc）,io文件持久化。

为什么要持久化？
有一些对象，不能让他丢掉
内存太贵
Ⅲ持久层

Dao层、Service层、Controller层

完成持久化工作的代码块
层界限十分明显

Ⅳ为什么需要MyBatis

帮助程序员将数据存入到数据库中
方便
传统的JDBC代码太复杂了，简化，框架，自动化
不用MyBatis也可以，技术没有高低之分
优点：
- 简单易学
- 灵活
- sql和代码的分离，提高了可维护性。
- 提供映射标签，支持对象与数据库的orm字段关系映射
- 提供对象关系映射标签，支持对象关系组建维护
- 提供xml标签，支持编写动态sql

二、第一个Mybaits程序

思路：搭建环境 --> 导入MyBatis --> 编写代码 --> 测试
Ⅰ搭建环境

创建一个普通的maven项目
删除src目录（就可以把此工程当做父工程了，然后创建子工程）
导入maven依赖
1. <mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers><mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers><mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers><mappers>
44. <typeAliases>
45. <typeAliases>
46. <mappers>
47. <mappers>
48. <mappers>
49. <settings>
50. <setting name="logImpl" value="STDOUT_LOGGING"/>
51. </settings><package name="com.Ji.dao"/>
52. </mappers><mapper />
53. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
54. </mappers><package name="com.kuang.pojo"/>
55. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
56. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
57. </mappers>mysql<mappers>
58. <typeAliases>
59. <typeAliases>
60. <mappers>
61. <mappers>
62. <mappers>
63. <settings>
64. <setting name="logImpl" value="STDOUT_LOGGING"/>
65. </settings><package name="com.Ji.dao"/>
66. </mappers><mapper />
67. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
68. </mappers><package name="com.kuang.pojo"/>
69. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
70. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
71. </mappers><mappers>
72. <typeAliases>
73. <typeAliases>
74. <mappers>
75. <mappers>
76. <mappers>
77. <settings>
78. <setting name="logImpl" value="STDOUT_LOGGING"/>
79. </settings><package name="com.Ji.dao"/>
80. </mappers><mapper />
81. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
82. </mappers><package name="com.kuang.pojo"/>
83. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
84. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
85. </mappers>mysql-connector-java<mappers>
86. <typeAliases>
87. <typeAliases>
88. <mappers>
89. <mappers>
90. <mappers>
91. <settings>
92. <setting name="logImpl" value="STDOUT_LOGGING"/>
93. </settings><package name="com.Ji.dao"/>
94. </mappers><mapper />
95. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
96. </mappers><package name="com.kuang.pojo"/>
97. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
98. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
99. </mappers><mappers>
100. <typeAliases>
101. <typeAliases>
102. <mappers>
103. <mappers>
104. <mappers>
105. <settings>
106. <setting name="logImpl" value="STDOUT_LOGGING"/>
107. </settings><package name="com.Ji.dao"/>
108. </mappers><mapper />
109. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
110. </mappers><package name="com.kuang.pojo"/>
111. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
112. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
113. </mappers>8.0.12<mappers>
114. <typeAliases>
115. <typeAliases>
116. <mappers>
117. <mappers>
118. <mappers>
119. <settings>
120. <setting name="logImpl" value="STDOUT_LOGGING"/>
121. </settings><package name="com.Ji.dao"/>
122. </mappers><mapper />
123. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
124. </mappers><package name="com.kuang.pojo"/>
125. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
126. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
127. </mappers><mappers>
128. <typeAliases>
129. <typeAliases>
130. <mappers>
131. <mappers>
132. <mappers>
133. <settings>
134. <setting name="logImpl" value="STDOUT_LOGGING"/>
135. </settings><package name="com.Ji.dao"/>
136. </mappers><mapper />
137. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
138. </mappers><package name="com.kuang.pojo"/>
139. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
140. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
141. </mappers>
142. <mappers>
143. <typeAliases>
144. <typeAliases>
145. <mappers>
146. <mappers>
147. <mappers>
148. <settings>
149. <setting name="logImpl" value="STDOUT_LOGGING"/>
150. </settings><package name="com.Ji.dao"/>
151. </mappers><mapper />
152. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
153. </mappers><package name="com.kuang.pojo"/>
154. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
155. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
156. </mappers><dependency>
157. <mappers>
158. <typeAliases>
159. <typeAliases>
160. <mappers>
161. <mappers>
162. <mappers>
163. <settings>
164. <setting name="logImpl" value="STDOUT_LOGGING"/>
165. </settings><package name="com.Ji.dao"/>
166. </mappers><mapper />
167. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
168. </mappers><package name="com.kuang.pojo"/>
169. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
170. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
171. </mappers><mappers>
172. <typeAliases>
173. <typeAliases>
174. <mappers>
175. <mappers>
176. <mappers>
177. <settings>
178. <setting name="logImpl" value="STDOUT_LOGGING"/>
179. </settings><package name="com.Ji.dao"/>
180. </mappers><mapper />
181. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
182. </mappers><package name="com.kuang.pojo"/>
183. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
184. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
185. </mappers><groupId>org.mybatis</groupId>
186. <mappers>
187. <typeAliases>
188. <typeAliases>
189. <mappers>
190. <mappers>
191. <mappers>
192. <settings>
193. <setting name="logImpl" value="STDOUT_LOGGING"/>
194. </settings><package name="com.Ji.dao"/>
195. </mappers><mapper />
196. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
197. </mappers><package name="com.kuang.pojo"/>
198. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
199. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
200. </mappers><mappers>
201. <typeAliases>
202. <typeAliases>
203. <mappers>
204. <mappers>
205. <mappers>
206. <settings>
207. <setting name="logImpl" value="STDOUT_LOGGING"/>
208. </settings><package name="com.Ji.dao"/>
209. </mappers><mapper />
210. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
211. </mappers><package name="com.kuang.pojo"/>
212. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
213. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
214. </mappers><artifactId>mybatis</artifactId>
215. <mappers>
216. <typeAliases>
217. <typeAliases>
218. <mappers>
219. <mappers>
220. <mappers>
221. <settings>
222. <setting name="logImpl" value="STDOUT_LOGGING"/>
223. </settings><package name="com.Ji.dao"/>
224. </mappers><mapper />
225. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
226. </mappers><package name="com.kuang.pojo"/>
227. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
228. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
229. </mappers><mappers>
230. <typeAliases>
231. <typeAliases>
232. <mappers>
233. <mappers>
234. <mappers>
235. <settings>
236. <setting name="logImpl" value="STDOUT_LOGGING"/>
237. </settings><package name="com.Ji.dao"/>
238. </mappers><mapper />
239. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
240. </mappers><package name="com.kuang.pojo"/>
241. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
242. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
243. </mappers><version>3.5.4</version>
244. <mappers>
245. <typeAliases>
246. <typeAliases>
247. <mappers>
248. <mappers>
249. <mappers>
250. <settings>
251. <setting name="logImpl" value="STDOUT_LOGGING"/>
252. </settings><package name="com.Ji.dao"/>
253. </mappers><mapper />
254. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
255. </mappers><package name="com.kuang.pojo"/>
256. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
257. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
258. </mappers></dependency><mappers>
259. <typeAliases>
260. <typeAliases>
261. <mappers>
262. <mappers>
263. <mappers>
264. <settings>
265. <setting name="logImpl" value="STDOUT_LOGGING"/>
266. </settings><package name="com.Ji.dao"/>
267. </mappers><mapper />
268. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
269. </mappers><package name="com.kuang.pojo"/>
270. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
271. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
272. </mappers><mappers>
273. <typeAliases>
274. <typeAliases>
275. <mappers>
276. <mappers>
277. <mappers>
278. <settings>
279. <setting name="logImpl" value="STDOUT_LOGGING"/>
280. </settings><package name="com.Ji.dao"/>
281. </mappers><mapper />
282. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
283. </mappers><package name="com.kuang.pojo"/>
284. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
285. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
286. </mappers><mappers>
287. <typeAliases>
288. <typeAliases>
289. <mappers>
290. <mappers>
291. <mappers>
292. <settings>
293. <setting name="logImpl" value="STDOUT_LOGGING"/>
294. </settings><package name="com.Ji.dao"/>
295. </mappers><mapper />
296. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
297. </mappers><package name="com.kuang.pojo"/>
298. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
299. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
300. </mappers><mappers>
301. <typeAliases>
302. <typeAliases>
303. <mappers>
304. <mappers>
305. <mappers>
306. <settings>
307. <setting name="logImpl" value="STDOUT_LOGGING"/>
308. </settings><package name="com.Ji.dao"/>
309. </mappers><mapper />
310. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
311. </mappers><package name="com.kuang.pojo"/>
312. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
313. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
314. </mappers>junit<mappers>
315. <typeAliases>
316. <typeAliases>
317. <mappers>
318. <mappers>
319. <mappers>
320. <settings>
321. <setting name="logImpl" value="STDOUT_LOGGING"/>
322. </settings><package name="com.Ji.dao"/>
323. </mappers><mapper />
324. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
325. </mappers><package name="com.kuang.pojo"/>
326. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
327. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
328. </mappers><mappers>
329. <typeAliases>
330. <typeAliases>
331. <mappers>
332. <mappers>
333. <mappers>
334. <settings>
335. <setting name="logImpl" value="STDOUT_LOGGING"/>
336. </settings><package name="com.Ji.dao"/>
337. </mappers><mapper />
338. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
339. </mappers><package name="com.kuang.pojo"/>
340. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
341. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
342. </mappers>junit<mappers>
343. <typeAliases>
344. <typeAliases>
345. <mappers>
346. <mappers>
347. <mappers>
348. <settings>
349. <setting name="logImpl" value="STDOUT_LOGGING"/>
350. </settings><package name="com.Ji.dao"/>
351. </mappers><mapper />
352. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
353. </mappers><package name="com.kuang.pojo"/>
354. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
355. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
356. </mappers><mappers>
357. <typeAliases>
358. <typeAliases>
359. <mappers>
360. <mappers>
361. <mappers>
362. <settings>
363. <setting name="logImpl" value="STDOUT_LOGGING"/>
364. </settings><package name="com.Ji.dao"/>
365. </mappers><mapper />
366. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
367. </mappers><package name="com.kuang.pojo"/>
368. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
369. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
370. </mappers>4.12<mappers>
371. <typeAliases>
372. <typeAliases>
373. <mappers>
374. <mappers>
375. <mappers>
376. <settings>
377. <setting name="logImpl" value="STDOUT_LOGGING"/>
378. </settings><package name="com.Ji.dao"/>
379. </mappers><mapper />
380. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
381. </mappers><package name="com.kuang.pojo"/>
382. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
383. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
384. </mappers><mappers>
385. <typeAliases>
386. <typeAliases>
387. <mappers>
388. <mappers>
389. <mappers>
390. <settings>
391. <setting name="logImpl" value="STDOUT_LOGGING"/>
392. </settings><package name="com.Ji.dao"/>
393. </mappers><mapper />
394. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
395. </mappers><package name="com.kuang.pojo"/>
396. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
397. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
398. </mappers>test<mappers>
399. <typeAliases>
400. <typeAliases>
401. <mappers>
402. <mappers>
403. <mappers>
404. <settings>
405. <setting name="logImpl" value="STDOUT_LOGGING"/>
406. </settings><package name="com.Ji.dao"/>
407. </mappers><mapper />
408. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
409. </mappers><package name="com.kuang.pojo"/>
410. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
411. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
412. </mappers>
复制代码
创建一个Module

创建Module时要注意，我自己的这个东西是不对的，需要修改

正确创建一个Maven项目的图示：

Ⅱ创建一个模块

详细参考【狂神说Java】Mybatis最新完整教程IDEA版通俗易懂_哔哩哔哩_bilibili
注意21：43的连接数据库和配置Mybatis即：找寻URL和name和password

编写mybatis的核心配置文件（连接数据库）
1. <?xml version="1.0" encoding="UTF-8" ?>
2. <!DOCTYPE configuration
3. <mappers>
4. <typeAliases>
5. <typeAliases>
6. <mappers>
7. <mappers>
8. <mappers>
9. <settings>
10. <setting name="logImpl" value="STDOUT_LOGGING"/>
11. </settings><package name="com.Ji.dao"/>
12. </mappers><mapper />
13. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
14. </mappers><package name="com.kuang.pojo"/>
15. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
16. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
17. </mappers><mappers>
18. <typeAliases>
19. <typeAliases>
20. <mappers>
21. <mappers>
22. <mappers>
23. <settings>
24. <setting name="logImpl" value="STDOUT_LOGGING"/>
25. </settings><package name="com.Ji.dao"/>
26. </mappers><mapper />
27. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
28. </mappers><package name="com.kuang.pojo"/>
29. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
30. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
31. </mappers>PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
32. <mappers>
33. <typeAliases>
34. <typeAliases>
35. <mappers>
36. <mappers>
37. <mappers>
38. <settings>
39. <setting name="logImpl" value="STDOUT_LOGGING"/>
40. </settings><package name="com.Ji.dao"/>
41. </mappers><mapper />
42. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
43. </mappers><package name="com.kuang.pojo"/>
44. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
45. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
46. </mappers><mappers>
47. <typeAliases>
48. <typeAliases>
49. <mappers>
50. <mappers>
51. <mappers>
52. <settings>
53. <setting name="logImpl" value="STDOUT_LOGGING"/>
54. </settings><package name="com.Ji.dao"/>
55. </mappers><mapper />
56. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
57. </mappers><package name="com.kuang.pojo"/>
58. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
59. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
60. </mappers>"http://mybatis.org/dtd/mybatis-3-config.dtd">
62. <configuration>
63. <mappers>
64. <typeAliases>
65. <typeAliases>
66. <mappers>
67. <mappers>
68. <mappers>
69. <settings>
70. <setting name="logImpl" value="STDOUT_LOGGING"/>
71. </settings><package name="com.Ji.dao"/>
72. </mappers><mapper />
73. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
74. </mappers><package name="com.kuang.pojo"/>
75. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
76. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
77. </mappers><environments default="development">
78. <mappers>
79. <typeAliases>
80. <typeAliases>
81. <mappers>
82. <mappers>
83. <mappers>
84. <settings>
85. <setting name="logImpl" value="STDOUT_LOGGING"/>
86. </settings><package name="com.Ji.dao"/>
87. </mappers><mapper />
88. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
89. </mappers><package name="com.kuang.pojo"/>
90. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
91. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
92. </mappers><mappers>
93. <typeAliases>
94. <typeAliases>
95. <mappers>
96. <mappers>
97. <mappers>
98. <settings>
99. <setting name="logImpl" value="STDOUT_LOGGING"/>
100. </settings><package name="com.Ji.dao"/>
101. </mappers><mapper />
102. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
103. </mappers><package name="com.kuang.pojo"/>
104. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
105. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
106. </mappers><environment id="development">
107. <mappers>
108. <typeAliases>
109. <typeAliases>
110. <mappers>
111. <mappers>
112. <mappers>
113. <settings>
114. <setting name="logImpl" value="STDOUT_LOGGING"/>
115. </settings><package name="com.Ji.dao"/>
116. </mappers><mapper />
117. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
118. </mappers><package name="com.kuang.pojo"/>
119. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
120. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
121. </mappers><mappers>
122. <typeAliases>
123. <typeAliases>
124. <mappers>
125. <mappers>
126. <mappers>
127. <settings>
128. <setting name="logImpl" value="STDOUT_LOGGING"/>
129. </settings><package name="com.Ji.dao"/>
130. </mappers><mapper />
131. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
132. </mappers><package name="com.kuang.pojo"/>
133. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
134. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
135. </mappers><mappers>
136. <typeAliases>
137. <typeAliases>
138. <mappers>
139. <mappers>
140. <mappers>
141. <settings>
142. <setting name="logImpl" value="STDOUT_LOGGING"/>
143. </settings><package name="com.Ji.dao"/>
144. </mappers><mapper />
145. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
146. </mappers><package name="com.kuang.pojo"/>
147. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
148. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
149. </mappers><transactionManager type="JDBC"/>
150. <mappers>
151. <typeAliases>
152. <typeAliases>
153. <mappers>
154. <mappers>
155. <mappers>
156. <settings>
157. <setting name="logImpl" value="STDOUT_LOGGING"/>
158. </settings><package name="com.Ji.dao"/>
159. </mappers><mapper />
160. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
161. </mappers><package name="com.kuang.pojo"/>
162. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
163. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
164. </mappers><mappers>
165. <typeAliases>
166. <typeAliases>
167. <mappers>
168. <mappers>
169. <mappers>
170. <settings>
171. <setting name="logImpl" value="STDOUT_LOGGING"/>
172. </settings><package name="com.Ji.dao"/>
173. </mappers><mapper />
174. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
175. </mappers><package name="com.kuang.pojo"/>
176. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
177. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
178. </mappers><mappers>
179. <typeAliases>
180. <typeAliases>
181. <mappers>
182. <mappers>
183. <mappers>
184. <settings>
185. <setting name="logImpl" value="STDOUT_LOGGING"/>
186. </settings><package name="com.Ji.dao"/>
187. </mappers><mapper />
188. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
189. </mappers><package name="com.kuang.pojo"/>
190. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
191. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
192. </mappers><dataSource type="POOLED">
193. <mappers>
194. <typeAliases>
195. <typeAliases>
196. <mappers>
197. <mappers>
198. <mappers>
199. <settings>
200. <setting name="logImpl" value="STDOUT_LOGGING"/>
201. </settings><package name="com.Ji.dao"/>
202. </mappers><mapper />
203. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
204. </mappers><package name="com.kuang.pojo"/>
205. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
206. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
207. </mappers><mappers>
208. <typeAliases>
209. <typeAliases>
210. <mappers>
211. <mappers>
212. <mappers>
213. <settings>
214. <setting name="logImpl" value="STDOUT_LOGGING"/>
215. </settings><package name="com.Ji.dao"/>
216. </mappers><mapper />
217. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
218. </mappers><package name="com.kuang.pojo"/>
219. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
220. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
221. </mappers><mappers>
222. <typeAliases>
223. <typeAliases>
224. <mappers>
225. <mappers>
226. <mappers>
227. <settings>
228. <setting name="logImpl" value="STDOUT_LOGGING"/>
229. </settings><package name="com.Ji.dao"/>
230. </mappers><mapper />
231. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
232. </mappers><package name="com.kuang.pojo"/>
233. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
234. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
235. </mappers><mappers>
236. <typeAliases>
237. <typeAliases>
238. <mappers>
239. <mappers>
240. <mappers>
241. <settings>
242. <setting name="logImpl" value="STDOUT_LOGGING"/>
243. </settings><package name="com.Ji.dao"/>
244. </mappers><mapper />
245. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
246. </mappers><package name="com.kuang.pojo"/>
247. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
248. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
249. </mappers><property name="driver" value="com.mysql.jdbc.Driver"/>
250. <mappers>
251. <typeAliases>
252. <typeAliases>
253. <mappers>
254. <mappers>
255. <mappers>
256. <settings>
257. <setting name="logImpl" value="STDOUT_LOGGING"/>
258. </settings><package name="com.Ji.dao"/>
259. </mappers><mapper />
260. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
261. </mappers><package name="com.kuang.pojo"/>
262. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
263. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
264. </mappers><mappers>
265. <typeAliases>
266. <typeAliases>
267. <mappers>
268. <mappers>
269. <mappers>
270. <settings>
271. <setting name="logImpl" value="STDOUT_LOGGING"/>
272. </settings><package name="com.Ji.dao"/>
273. </mappers><mapper />
274. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
275. </mappers><package name="com.kuang.pojo"/>
276. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
277. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
278. </mappers><mappers>
279. <typeAliases>
280. <typeAliases>
281. <mappers>
282. <mappers>
283. <mappers>
284. <settings>
285. <setting name="logImpl" value="STDOUT_LOGGING"/>
286. </settings><package name="com.Ji.dao"/>
287. </mappers><mapper />
288. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
289. </mappers><package name="com.kuang.pojo"/>
290. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
291. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
292. </mappers><mappers>
293. <typeAliases>
294. <typeAliases>
295. <mappers>
296. <mappers>
297. <mappers>
298. <settings>
299. <setting name="logImpl" value="STDOUT_LOGGING"/>
300. </settings><package name="com.Ji.dao"/>
301. </mappers><mapper />
302. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
303. </mappers><package name="com.kuang.pojo"/>
304. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
305. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
306. </mappers><property name="url" value="jdbc:mysql://localhost:3306/mybatis?userSSL=true&useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC"/>
307. <mappers>
308. <typeAliases>
309. <typeAliases>
310. <mappers>
311. <mappers>
312. <mappers>
313. <settings>
314. <setting name="logImpl" value="STDOUT_LOGGING"/>
315. </settings><package name="com.Ji.dao"/>
316. </mappers><mapper />
317. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
318. </mappers><package name="com.kuang.pojo"/>
319. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
320. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
321. </mappers><mappers>
322. <typeAliases>
323. <typeAliases>
324. <mappers>
325. <mappers>
326. <mappers>
327. <settings>
328. <setting name="logImpl" value="STDOUT_LOGGING"/>
329. </settings><package name="com.Ji.dao"/>
330. </mappers><mapper />
331. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
332. </mappers><package name="com.kuang.pojo"/>
333. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
334. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
335. </mappers><mappers>
336. <typeAliases>
337. <typeAliases>
338. <mappers>
339. <mappers>
340. <mappers>
341. <settings>
342. <setting name="logImpl" value="STDOUT_LOGGING"/>
343. </settings><package name="com.Ji.dao"/>
344. </mappers><mapper />
345. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
346. </mappers><package name="com.kuang.pojo"/>
347. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
348. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
349. </mappers><mappers>
350. <typeAliases>
351. <typeAliases>
352. <mappers>
353. <mappers>
354. <mappers>
355. <settings>
356. <setting name="logImpl" value="STDOUT_LOGGING"/>
357. </settings><package name="com.Ji.dao"/>
358. </mappers><mapper />
359. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
360. </mappers><package name="com.kuang.pojo"/>
361. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
362. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
363. </mappers><property name="username" value="root"/>
364. <mappers>
365. <typeAliases>
366. <typeAliases>
367. <mappers>
368. <mappers>
369. <mappers>
370. <settings>
371. <setting name="logImpl" value="STDOUT_LOGGING"/>
372. </settings><package name="com.Ji.dao"/>
373. </mappers><mapper />
374. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
375. </mappers><package name="com.kuang.pojo"/>
376. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
377. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
378. </mappers><mappers>
379. <typeAliases>
380. <typeAliases>
381. <mappers>
382. <mappers>
383. <mappers>
384. <settings>
385. <setting name="logImpl" value="STDOUT_LOGGING"/>
386. </settings><package name="com.Ji.dao"/>
387. </mappers><mapper />
388. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
389. </mappers><package name="com.kuang.pojo"/>
390. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
391. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
392. </mappers><mappers>
393. <typeAliases>
394. <typeAliases>
395. <mappers>
396. <mappers>
397. <mappers>
398. <settings>
399. <setting name="logImpl" value="STDOUT_LOGGING"/>
400. </settings><package name="com.Ji.dao"/>
401. </mappers><mapper />
402. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
403. </mappers><package name="com.kuang.pojo"/>
404. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
405. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
406. </mappers><mappers>
407. <typeAliases>
408. <typeAliases>
409. <mappers>
410. <mappers>
411. <mappers>
412. <settings>
413. <setting name="logImpl" value="STDOUT_LOGGING"/>
414. </settings><package name="com.Ji.dao"/>
415. </mappers><mapper />
416. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
417. </mappers><package name="com.kuang.pojo"/>
418. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
419. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
420. </mappers><property name="password" value="123456"/>
421. <mappers>
422. <typeAliases>
423. <typeAliases>
424. <mappers>
425. <mappers>
426. <mappers>
427. <settings>
428. <setting name="logImpl" value="STDOUT_LOGGING"/>
429. </settings><package name="com.Ji.dao"/>
430. </mappers><mapper />
431. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
432. </mappers><package name="com.kuang.pojo"/>
433. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
434. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
435. </mappers><mappers>
436. <typeAliases>
437. <typeAliases>
438. <mappers>
439. <mappers>
440. <mappers>
441. <settings>
442. <setting name="logImpl" value="STDOUT_LOGGING"/>
443. </settings><package name="com.Ji.dao"/>
444. </mappers><mapper />
445. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
446. </mappers><package name="com.kuang.pojo"/>
447. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
448. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
449. </mappers><mappers>
450. <typeAliases>
451. <typeAliases>
452. <mappers>
453. <mappers>
454. <mappers>
455. <settings>
456. <setting name="logImpl" value="STDOUT_LOGGING"/>
457. </settings><package name="com.Ji.dao"/>
458. </mappers><mapper />
459. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
460. </mappers><package name="com.kuang.pojo"/>
461. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
462. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
463. </mappers></dataSource>
464. <mappers>
465. <typeAliases>
466. <typeAliases>
467. <mappers>
468. <mappers>
469. <mappers>
470. <settings>
471. <setting name="logImpl" value="STDOUT_LOGGING"/>
472. </settings><package name="com.Ji.dao"/>
473. </mappers><mapper />
474. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
475. </mappers><package name="com.kuang.pojo"/>
476. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
477. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
478. </mappers><mappers>
479. <typeAliases>
480. <typeAliases>
481. <mappers>
482. <mappers>
483. <mappers>
484. <settings>
485. <setting name="logImpl" value="STDOUT_LOGGING"/>
486. </settings><package name="com.Ji.dao"/>
487. </mappers><mapper />
488. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
489. </mappers><package name="com.kuang.pojo"/>
490. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
491. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
492. </mappers></environment>
493. <mappers>
494. <typeAliases>
495. <typeAliases>
496. <mappers>
497. <mappers>
498. <mappers>
499. <settings>
500. <setting name="logImpl" value="STDOUT_LOGGING"/>
501. </settings><package name="com.Ji.dao"/>
502. </mappers><mapper />
503. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
504. </mappers><package name="com.kuang.pojo"/>
505. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
506. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
507. </mappers></environments>
508. </configuration>
复制代码
编写mybatis工具类（写死的，这是固定步骤）
1. package com.Ji.utils;
3. import org.apache.ibatis.io.Resources;
4. import org.apache.ibatis.session.SqlSession;
5. import org.apache.ibatis.session.SqlSessionFactory;
6. import org.apache.ibatis.session.SqlSessionFactoryBuilder;
8. import java.io.IOException;
9. import java.io.InputStream;
11. //sqlSessionFactory --> sqlSession 工厂模式
12. public class MybatisUtils {
14. <mappers>
15. <typeAliases>
16. <typeAliases>
17. <mappers>
18. <mappers>
19. <mappers>
20. <settings>
21. <setting name="logImpl" value="STDOUT_LOGGING"/>
22. </settings><package name="com.Ji.dao"/>
23. </mappers><mapper />
24. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
25. </mappers><package name="com.kuang.pojo"/>
26. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
27. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
28. </mappers>static SqlSessionFactory sqlSessionFactory = null;
30. <mappers>
31. <typeAliases>
32. <typeAliases>
33. <mappers>
34. <mappers>
35. <mappers>
36. <settings>
37. <setting name="logImpl" value="STDOUT_LOGGING"/>
38. </settings><package name="com.Ji.dao"/>
39. </mappers><mapper />
40. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
41. </mappers><package name="com.kuang.pojo"/>
42. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
43. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
44. </mappers>static {
45. <mappers>
46. <typeAliases>
47. <typeAliases>
48. <mappers>
49. <mappers>
50. <mappers>
51. <settings>
52. <setting name="logImpl" value="STDOUT_LOGGING"/>
53. </settings><package name="com.Ji.dao"/>
54. </mappers><mapper />
55. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
56. </mappers><package name="com.kuang.pojo"/>
57. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
58. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
59. </mappers><mappers>
60. <typeAliases>
61. <typeAliases>
62. <mappers>
63. <mappers>
64. <mappers>
65. <settings>
66. <setting name="logImpl" value="STDOUT_LOGGING"/>
67. </settings><package name="com.Ji.dao"/>
68. </mappers><mapper />
69. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
70. </mappers><package name="com.kuang.pojo"/>
71. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
72. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
73. </mappers>try {
74. <mappers>
75. <typeAliases>
76. <typeAliases>
77. <mappers>
78. <mappers>
79. <mappers>
80. <settings>
81. <setting name="logImpl" value="STDOUT_LOGGING"/>
82. </settings><package name="com.Ji.dao"/>
83. </mappers><mapper />
84. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
85. </mappers><package name="com.kuang.pojo"/>
86. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
87. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
88. </mappers><mappers>
89. <typeAliases>
90. <typeAliases>
91. <mappers>
92. <mappers>
93. <mappers>
94. <settings>
95. <setting name="logImpl" value="STDOUT_LOGGING"/>
96. </settings><package name="com.Ji.dao"/>
97. </mappers><mapper />
98. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
99. </mappers><package name="com.kuang.pojo"/>
100. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
101. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
102. </mappers><mappers>
103. <typeAliases>
104. <typeAliases>
105. <mappers>
106. <mappers>
107. <mappers>
108. <settings>
109. <setting name="logImpl" value="STDOUT_LOGGING"/>
110. </settings><package name="com.Ji.dao"/>
111. </mappers><mapper />
112. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
113. </mappers><package name="com.kuang.pojo"/>
114. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
115. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
116. </mappers>//使用Mybatis第一步：获取sqlSessionFactory对象
117. <mappers>
118. <typeAliases>
119. <typeAliases>
120. <mappers>
121. <mappers>
122. <mappers>
123. <settings>
124. <setting name="logImpl" value="STDOUT_LOGGING"/>
125. </settings><package name="com.Ji.dao"/>
126. </mappers><mapper />
127. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
128. </mappers><package name="com.kuang.pojo"/>
129. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
130. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
131. </mappers><mappers>
132. <typeAliases>
133. <typeAliases>
134. <mappers>
135. <mappers>
136. <mappers>
137. <settings>
138. <setting name="logImpl" value="STDOUT_LOGGING"/>
139. </settings><package name="com.Ji.dao"/>
140. </mappers><mapper />
141. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
142. </mappers><package name="com.kuang.pojo"/>
143. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
144. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
145. </mappers><mappers>
146. <typeAliases>
147. <typeAliases>
148. <mappers>
149. <mappers>
150. <mappers>
151. <settings>
152. <setting name="logImpl" value="STDOUT_LOGGING"/>
153. </settings><package name="com.Ji.dao"/>
154. </mappers><mapper />
155. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
156. </mappers><package name="com.kuang.pojo"/>
157. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
158. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
159. </mappers>String resource = "mybatis-config.xml";
160. <mappers>
161. <typeAliases>
162. <typeAliases>
163. <mappers>
164. <mappers>
165. <mappers>
166. <settings>
167. <setting name="logImpl" value="STDOUT_LOGGING"/>
168. </settings><package name="com.Ji.dao"/>
169. </mappers><mapper />
170. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
171. </mappers><package name="com.kuang.pojo"/>
172. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
173. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
174. </mappers><mappers>
175. <typeAliases>
176. <typeAliases>
177. <mappers>
178. <mappers>
179. <mappers>
180. <settings>
181. <setting name="logImpl" value="STDOUT_LOGGING"/>
182. </settings><package name="com.Ji.dao"/>
183. </mappers><mapper />
184. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
185. </mappers><package name="com.kuang.pojo"/>
186. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
187. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
188. </mappers><mappers>
189. <typeAliases>
190. <typeAliases>
191. <mappers>
192. <mappers>
193. <mappers>
194. <settings>
195. <setting name="logImpl" value="STDOUT_LOGGING"/>
196. </settings><package name="com.Ji.dao"/>
197. </mappers><mapper />
198. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
199. </mappers><package name="com.kuang.pojo"/>
200. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
201. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
202. </mappers>InputStream inputStream = Resources.getResourceAsStream(resource);
203. <mappers>
204. <typeAliases>
205. <typeAliases>
206. <mappers>
207. <mappers>
208. <mappers>
209. <settings>
210. <setting name="logImpl" value="STDOUT_LOGGING"/>
211. </settings><package name="com.Ji.dao"/>
212. </mappers><mapper />
213. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
214. </mappers><package name="com.kuang.pojo"/>
215. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
216. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
217. </mappers><mappers>
218. <typeAliases>
219. <typeAliases>
220. <mappers>
221. <mappers>
222. <mappers>
223. <settings>
224. <setting name="logImpl" value="STDOUT_LOGGING"/>
225. </settings><package name="com.Ji.dao"/>
226. </mappers><mapper />
227. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
228. </mappers><package name="com.kuang.pojo"/>
229. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
230. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
231. </mappers><mappers>
232. <typeAliases>
233. <typeAliases>
234. <mappers>
235. <mappers>
236. <mappers>
237. <settings>
238. <setting name="logImpl" value="STDOUT_LOGGING"/>
239. </settings><package name="com.Ji.dao"/>
240. </mappers><mapper />
241. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
242. </mappers><package name="com.kuang.pojo"/>
243. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
244. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
245. </mappers>sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
246. <mappers>
247. <typeAliases>
248. <typeAliases>
249. <mappers>
250. <mappers>
251. <mappers>
252. <settings>
253. <setting name="logImpl" value="STDOUT_LOGGING"/>
254. </settings><package name="com.Ji.dao"/>
255. </mappers><mapper />
256. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
257. </mappers><package name="com.kuang.pojo"/>
258. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
259. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
260. </mappers><mappers>
261. <typeAliases>
262. <typeAliases>
263. <mappers>
264. <mappers>
265. <mappers>
266. <settings>
267. <setting name="logImpl" value="STDOUT_LOGGING"/>
268. </settings><package name="com.Ji.dao"/>
269. </mappers><mapper />
270. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
271. </mappers><package name="com.kuang.pojo"/>
272. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
273. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
274. </mappers>} catch (IOException e) {
275. <mappers>
276. <typeAliases>
277. <typeAliases>
278. <mappers>
279. <mappers>
280. <mappers>
281. <settings>
282. <setting name="logImpl" value="STDOUT_LOGGING"/>
283. </settings><package name="com.Ji.dao"/>
284. </mappers><mapper />
285. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
286. </mappers><package name="com.kuang.pojo"/>
287. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
288. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
289. </mappers><mappers>
290. <typeAliases>
291. <typeAliases>
292. <mappers>
293. <mappers>
294. <mappers>
295. <settings>
296. <setting name="logImpl" value="STDOUT_LOGGING"/>
297. </settings><package name="com.Ji.dao"/>
298. </mappers><mapper />
299. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
300. </mappers><package name="com.kuang.pojo"/>
301. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
302. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
303. </mappers><mappers>
304. <typeAliases>
305. <typeAliases>
306. <mappers>
307. <mappers>
308. <mappers>
309. <settings>
310. <setting name="logImpl" value="STDOUT_LOGGING"/>
311. </settings><package name="com.Ji.dao"/>
312. </mappers><mapper />
313. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
314. </mappers><package name="com.kuang.pojo"/>
315. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
316. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
317. </mappers>e.printStackTrace();
318. <mappers>
319. <typeAliases>
320. <typeAliases>
321. <mappers>
322. <mappers>
323. <mappers>
324. <settings>
325. <setting name="logImpl" value="STDOUT_LOGGING"/>
326. </settings><package name="com.Ji.dao"/>
327. </mappers><mapper />
328. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
329. </mappers><package name="com.kuang.pojo"/>
330. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
331. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
332. </mappers><mappers>
333. <typeAliases>
334. <typeAliases>
335. <mappers>
336. <mappers>
337. <mappers>
338. <settings>
339. <setting name="logImpl" value="STDOUT_LOGGING"/>
340. </settings><package name="com.Ji.dao"/>
341. </mappers><mapper />
342. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
343. </mappers><package name="com.kuang.pojo"/>
344. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
345. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
346. </mappers>}
347. <mappers>
348. <typeAliases>
349. <typeAliases>
350. <mappers>
351. <mappers>
352. <mappers>
353. <settings>
354. <setting name="logImpl" value="STDOUT_LOGGING"/>
355. </settings><package name="com.Ji.dao"/>
356. </mappers><mapper />
357. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
358. </mappers><package name="com.kuang.pojo"/>
359. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
360. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
361. </mappers>}
363. <mappers>
364. <typeAliases>
365. <typeAliases>
366. <mappers>
367. <mappers>
368. <mappers>
369. <settings>
370. <setting name="logImpl" value="STDOUT_LOGGING"/>
371. </settings><package name="com.Ji.dao"/>
372. </mappers><mapper />
373. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
374. </mappers><package name="com.kuang.pojo"/>
375. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
376. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
377. </mappers>//既然有了 SqlSessionFactory，顾名思义，我们可以从中获得 SqlSession 的实例.
378. <mappers>
379. <typeAliases>
380. <typeAliases>
381. <mappers>
382. <mappers>
383. <mappers>
384. <settings>
385. <setting name="logImpl" value="STDOUT_LOGGING"/>
386. </settings><package name="com.Ji.dao"/>
387. </mappers><mapper />
388. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
389. </mappers><package name="com.kuang.pojo"/>
390. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
391. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
392. </mappers>// SqlSession 提供了在数据库执行 SQL 命令所需的所有方法。
393. <mappers>
394. <typeAliases>
395. <typeAliases>
396. <mappers>
397. <mappers>
398. <mappers>
399. <settings>
400. <setting name="logImpl" value="STDOUT_LOGGING"/>
401. </settings><package name="com.Ji.dao"/>
402. </mappers><mapper />
403. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
404. </mappers><package name="com.kuang.pojo"/>
405. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
406. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
407. </mappers>public static SqlSession getSqlSession(){
408. <mappers>
409. <typeAliases>
410. <typeAliases>
411. <mappers>
412. <mappers>
413. <mappers>
414. <settings>
415. <setting name="logImpl" value="STDOUT_LOGGING"/>
416. </settings><package name="com.Ji.dao"/>
417. </mappers><mapper />
418. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
419. </mappers><package name="com.kuang.pojo"/>
420. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
421. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
422. </mappers><mappers>
423. <typeAliases>
424. <typeAliases>
425. <mappers>
426. <mappers>
427. <mappers>
428. <settings>
429. <setting name="logImpl" value="STDOUT_LOGGING"/>
430. </settings><package name="com.Ji.dao"/>
431. </mappers><mapper />
432. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
433. </mappers><package name="com.kuang.pojo"/>
434. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
435. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
436. </mappers>return sqlSessionFactory.openSession();
437. <mappers>
438. <typeAliases>
439. <typeAliases>
440. <mappers>
441. <mappers>
442. <mappers>
443. <settings>
444. <setting name="logImpl" value="STDOUT_LOGGING"/>
445. </settings><package name="com.Ji.dao"/>
446. </mappers><mapper />
447. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
448. </mappers><package name="com.kuang.pojo"/>
449. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
450. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
451. </mappers>}
452. }
复制代码

Ⅲ编写代码

实体类
1. package com.Ji.pojo;
3. //实体类
4. public class User {
5. <mappers>
6. <typeAliases>
7. <typeAliases>
8. <mappers>
9. <mappers>
10. <mappers>
11. <settings>
12. <setting name="logImpl" value="STDOUT_LOGGING"/>
13. </settings><package name="com.Ji.dao"/>
14. </mappers><mapper />
15. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
16. </mappers><package name="com.kuang.pojo"/>
17. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
18. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
19. </mappers>private int id;
20. <mappers>
21. <typeAliases>
22. <typeAliases>
23. <mappers>
24. <mappers>
25. <mappers>
26. <settings>
27. <setting name="logImpl" value="STDOUT_LOGGING"/>
28. </settings><package name="com.Ji.dao"/>
29. </mappers><mapper />
30. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
31. </mappers><package name="com.kuang.pojo"/>
32. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
33. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
34. </mappers>private String name;
35. <mappers>
36. <typeAliases>
37. <typeAliases>
38. <mappers>
39. <mappers>
40. <mappers>
41. <settings>
42. <setting name="logImpl" value="STDOUT_LOGGING"/>
43. </settings><package name="com.Ji.dao"/>
44. </mappers><mapper />
45. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
46. </mappers><package name="com.kuang.pojo"/>
47. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
48. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
49. </mappers>private String pwd ;
51. <mappers>
52. <typeAliases>
53. <typeAliases>
54. <mappers>
55. <mappers>
56. <mappers>
57. <settings>
58. <setting name="logImpl" value="STDOUT_LOGGING"/>
59. </settings><package name="com.Ji.dao"/>
60. </mappers><mapper />
61. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
62. </mappers><package name="com.kuang.pojo"/>
63. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
64. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
65. </mappers>public User(){}
67. <mappers>
68. <typeAliases>
69. <typeAliases>
70. <mappers>
71. <mappers>
72. <mappers>
73. <settings>
74. <setting name="logImpl" value="STDOUT_LOGGING"/>
75. </settings><package name="com.Ji.dao"/>
76. </mappers><mapper />
77. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
78. </mappers><package name="com.kuang.pojo"/>
79. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
80. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
81. </mappers>public User(int id, String name, String pwd){
82. <mappers>
83. <typeAliases>
84. <typeAliases>
85. <mappers>
86. <mappers>
87. <mappers>
88. <settings>
89. <setting name="logImpl" value="STDOUT_LOGGING"/>
90. </settings><package name="com.Ji.dao"/>
91. </mappers><mapper />
92. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
93. </mappers><package name="com.kuang.pojo"/>
94. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
95. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
96. </mappers><mappers>
97. <typeAliases>
98. <typeAliases>
99. <mappers>
100. <mappers>
101. <mappers>
102. <settings>
103. <setting name="logImpl" value="STDOUT_LOGGING"/>
104. </settings><package name="com.Ji.dao"/>
105. </mappers><mapper />
106. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
107. </mappers><package name="com.kuang.pojo"/>
108. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
109. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
110. </mappers>this.id = id;
111. <mappers>
112. <typeAliases>
113. <typeAliases>
114. <mappers>
115. <mappers>
116. <mappers>
117. <settings>
118. <setting name="logImpl" value="STDOUT_LOGGING"/>
119. </settings><package name="com.Ji.dao"/>
120. </mappers><mapper />
121. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
122. </mappers><package name="com.kuang.pojo"/>
123. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
124. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
125. </mappers><mappers>
126. <typeAliases>
127. <typeAliases>
128. <mappers>
129. <mappers>
130. <mappers>
131. <settings>
132. <setting name="logImpl" value="STDOUT_LOGGING"/>
133. </settings><package name="com.Ji.dao"/>
134. </mappers><mapper />
135. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
136. </mappers><package name="com.kuang.pojo"/>
137. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
138. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
139. </mappers>this.name = name;
140. <mappers>
141. <typeAliases>
142. <typeAliases>
143. <mappers>
144. <mappers>
145. <mappers>
146. <settings>
147. <setting name="logImpl" value="STDOUT_LOGGING"/>
148. </settings><package name="com.Ji.dao"/>
149. </mappers><mapper />
150. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
151. </mappers><package name="com.kuang.pojo"/>
152. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
153. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
154. </mappers><mappers>
155. <typeAliases>
156. <typeAliases>
157. <mappers>
158. <mappers>
159. <mappers>
160. <settings>
161. <setting name="logImpl" value="STDOUT_LOGGING"/>
162. </settings><package name="com.Ji.dao"/>
163. </mappers><mapper />
164. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
165. </mappers><package name="com.kuang.pojo"/>
166. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
167. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
168. </mappers>this.pwd = pwd;
169. <mappers>
170. <typeAliases>
171. <typeAliases>
172. <mappers>
173. <mappers>
174. <mappers>
175. <settings>
176. <setting name="logImpl" value="STDOUT_LOGGING"/>
177. </settings><package name="com.Ji.dao"/>
178. </mappers><mapper />
179. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
180. </mappers><package name="com.kuang.pojo"/>
181. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
182. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
183. </mappers>}
185. <mappers>
186. <typeAliases>
187. <typeAliases>
188. <mappers>
189. <mappers>
190. <mappers>
191. <settings>
192. <setting name="logImpl" value="STDOUT_LOGGING"/>
193. </settings><package name="com.Ji.dao"/>
194. </mappers><mapper />
195. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
196. </mappers><package name="com.kuang.pojo"/>
197. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
198. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
199. </mappers>public int getId() {
200. <mappers>
201. <typeAliases>
202. <typeAliases>
203. <mappers>
204. <mappers>
205. <mappers>
206. <settings>
207. <setting name="logImpl" value="STDOUT_LOGGING"/>
208. </settings><package name="com.Ji.dao"/>
209. </mappers><mapper />
210. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
211. </mappers><package name="com.kuang.pojo"/>
212. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
213. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
214. </mappers><mappers>
215. <typeAliases>
216. <typeAliases>
217. <mappers>
218. <mappers>
219. <mappers>
220. <settings>
221. <setting name="logImpl" value="STDOUT_LOGGING"/>
222. </settings><package name="com.Ji.dao"/>
223. </mappers><mapper />
224. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
225. </mappers><package name="com.kuang.pojo"/>
226. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
227. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
228. </mappers>return id;
229. <mappers>
230. <typeAliases>
231. <typeAliases>
232. <mappers>
233. <mappers>
234. <mappers>
235. <settings>
236. <setting name="logImpl" value="STDOUT_LOGGING"/>
237. </settings><package name="com.Ji.dao"/>
238. </mappers><mapper />
239. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
240. </mappers><package name="com.kuang.pojo"/>
241. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
242. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
243. </mappers>}
245. <mappers>
246. <typeAliases>
247. <typeAliases>
248. <mappers>
249. <mappers>
250. <mappers>
251. <settings>
252. <setting name="logImpl" value="STDOUT_LOGGING"/>
253. </settings><package name="com.Ji.dao"/>
254. </mappers><mapper />
255. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
256. </mappers><package name="com.kuang.pojo"/>
257. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
258. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
259. </mappers>public void setId(int id) {
260. <mappers>
261. <typeAliases>
262. <typeAliases>
263. <mappers>
264. <mappers>
265. <mappers>
266. <settings>
267. <setting name="logImpl" value="STDOUT_LOGGING"/>
268. </settings><package name="com.Ji.dao"/>
269. </mappers><mapper />
270. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
271. </mappers><package name="com.kuang.pojo"/>
272. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
273. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
274. </mappers><mappers>
275. <typeAliases>
276. <typeAliases>
277. <mappers>
278. <mappers>
279. <mappers>
280. <settings>
281. <setting name="logImpl" value="STDOUT_LOGGING"/>
282. </settings><package name="com.Ji.dao"/>
283. </mappers><mapper />
284. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
285. </mappers><package name="com.kuang.pojo"/>
286. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
287. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
288. </mappers>this.id = id;
289. <mappers>
290. <typeAliases>
291. <typeAliases>
292. <mappers>
293. <mappers>
294. <mappers>
295. <settings>
296. <setting name="logImpl" value="STDOUT_LOGGING"/>
297. </settings><package name="com.Ji.dao"/>
298. </mappers><mapper />
299. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
300. </mappers><package name="com.kuang.pojo"/>
301. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
302. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
303. </mappers>}
305. <mappers>
306. <typeAliases>
307. <typeAliases>
308. <mappers>
309. <mappers>
310. <mappers>
311. <settings>
312. <setting name="logImpl" value="STDOUT_LOGGING"/>
313. </settings><package name="com.Ji.dao"/>
314. </mappers><mapper />
315. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
316. </mappers><package name="com.kuang.pojo"/>
317. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
318. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
319. </mappers>public String getName() {
320. <mappers>
321. <typeAliases>
322. <typeAliases>
323. <mappers>
324. <mappers>
325. <mappers>
326. <settings>
327. <setting name="logImpl" value="STDOUT_LOGGING"/>
328. </settings><package name="com.Ji.dao"/>
329. </mappers><mapper />
330. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
331. </mappers><package name="com.kuang.pojo"/>
332. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
333. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
334. </mappers><mappers>
335. <typeAliases>
336. <typeAliases>
337. <mappers>
338. <mappers>
339. <mappers>
340. <settings>
341. <setting name="logImpl" value="STDOUT_LOGGING"/>
342. </settings><package name="com.Ji.dao"/>
343. </mappers><mapper />
344. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
345. </mappers><package name="com.kuang.pojo"/>
346. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
347. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
348. </mappers>return name;
349. <mappers>
350. <typeAliases>
351. <typeAliases>
352. <mappers>
353. <mappers>
354. <mappers>
355. <settings>
356. <setting name="logImpl" value="STDOUT_LOGGING"/>
357. </settings><package name="com.Ji.dao"/>
358. </mappers><mapper />
359. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
360. </mappers><package name="com.kuang.pojo"/>
361. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
362. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
363. </mappers>}
365. <mappers>
366. <typeAliases>
367. <typeAliases>
368. <mappers>
369. <mappers>
370. <mappers>
371. <settings>
372. <setting name="logImpl" value="STDOUT_LOGGING"/>
373. </settings><package name="com.Ji.dao"/>
374. </mappers><mapper />
375. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
376. </mappers><package name="com.kuang.pojo"/>
377. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
378. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
379. </mappers>public void setName(String name) {
380. <mappers>
381. <typeAliases>
382. <typeAliases>
383. <mappers>
384. <mappers>
385. <mappers>
386. <settings>
387. <setting name="logImpl" value="STDOUT_LOGGING"/>
388. </settings><package name="com.Ji.dao"/>
389. </mappers><mapper />
390. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
391. </mappers><package name="com.kuang.pojo"/>
392. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
393. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
394. </mappers><mappers>
395. <typeAliases>
396. <typeAliases>
397. <mappers>
398. <mappers>
399. <mappers>
400. <settings>
401. <setting name="logImpl" value="STDOUT_LOGGING"/>
402. </settings><package name="com.Ji.dao"/>
403. </mappers><mapper />
404. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
405. </mappers><package name="com.kuang.pojo"/>
406. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
407. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
408. </mappers>this.name = name;
409. <mappers>
410. <typeAliases>
411. <typeAliases>
412. <mappers>
413. <mappers>
414. <mappers>
415. <settings>
416. <setting name="logImpl" value="STDOUT_LOGGING"/>
417. </settings><package name="com.Ji.dao"/>
418. </mappers><mapper />
419. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
420. </mappers><package name="com.kuang.pojo"/>
421. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
422. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
423. </mappers>}
425. <mappers>
426. <typeAliases>
427. <typeAliases>
428. <mappers>
429. <mappers>
430. <mappers>
431. <settings>
432. <setting name="logImpl" value="STDOUT_LOGGING"/>
433. </settings><package name="com.Ji.dao"/>
434. </mappers><mapper />
435. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
436. </mappers><package name="com.kuang.pojo"/>
437. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
438. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
439. </mappers>public String getPwd() {
440. <mappers>
441. <typeAliases>
442. <typeAliases>
443. <mappers>
444. <mappers>
445. <mappers>
446. <settings>
447. <setting name="logImpl" value="STDOUT_LOGGING"/>
448. </settings><package name="com.Ji.dao"/>
449. </mappers><mapper />
450. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
451. </mappers><package name="com.kuang.pojo"/>
452. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
453. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
454. </mappers><mappers>
455. <typeAliases>
456. <typeAliases>
457. <mappers>
458. <mappers>
459. <mappers>
460. <settings>
461. <setting name="logImpl" value="STDOUT_LOGGING"/>
462. </settings><package name="com.Ji.dao"/>
463. </mappers><mapper />
464. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
465. </mappers><package name="com.kuang.pojo"/>
466. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
467. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
468. </mappers>return pwd;
469. <mappers>
470. <typeAliases>
471. <typeAliases>
472. <mappers>
473. <mappers>
474. <mappers>
475. <settings>
476. <setting name="logImpl" value="STDOUT_LOGGING"/>
477. </settings><package name="com.Ji.dao"/>
478. </mappers><mapper />
479. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
480. </mappers><package name="com.kuang.pojo"/>
481. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
482. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
483. </mappers>}
485. <mappers>
486. <typeAliases>
487. <typeAliases>
488. <mappers>
489. <mappers>
490. <mappers>
491. <settings>
492. <setting name="logImpl" value="STDOUT_LOGGING"/>
493. </settings><package name="com.Ji.dao"/>
494. </mappers><mapper />
495. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
496. </mappers><package name="com.kuang.pojo"/>
497. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
498. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
499. </mappers>public void setPwd(String pwd) {
500. <mappers>
501. <typeAliases>
502. <typeAliases>
503. <mappers>
504. <mappers>
505. <mappers>
506. <settings>
507. <setting name="logImpl" value="STDOUT_LOGGING"/>
508. </settings><package name="com.Ji.dao"/>
509. </mappers><mapper />
510. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
511. </mappers><package name="com.kuang.pojo"/>
512. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
513. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
514. </mappers><mappers>
515. <typeAliases>
516. <typeAliases>
517. <mappers>
518. <mappers>
519. <mappers>
520. <settings>
521. <setting name="logImpl" value="STDOUT_LOGGING"/>
522. </settings><package name="com.Ji.dao"/>
523. </mappers><mapper />
524. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
525. </mappers><package name="com.kuang.pojo"/>
526. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
527. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
528. </mappers>this.pwd = pwd;
529. <mappers>
530. <typeAliases>
531. <typeAliases>
532. <mappers>
533. <mappers>
534. <mappers>
535. <settings>
536. <setting name="logImpl" value="STDOUT_LOGGING"/>
537. </settings><package name="com.Ji.dao"/>
538. </mappers><mapper />
539. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
540. </mappers><package name="com.kuang.pojo"/>
541. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
542. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
543. </mappers>}
545. <mappers>
546. <typeAliases>
547. <typeAliases>
548. <mappers>
549. <mappers>
550. <mappers>
551. <settings>
552. <setting name="logImpl" value="STDOUT_LOGGING"/>
553. </settings><package name="com.Ji.dao"/>
554. </mappers><mapper />
555. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
556. </mappers><package name="com.kuang.pojo"/>
557. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
558. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
559. </mappers>@Override
560. <mappers>
561. <typeAliases>
562. <typeAliases>
563. <mappers>
564. <mappers>
565. <mappers>
566. <settings>
567. <setting name="logImpl" value="STDOUT_LOGGING"/>
568. </settings><package name="com.Ji.dao"/>
569. </mappers><mapper />
570. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
571. </mappers><package name="com.kuang.pojo"/>
572. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
573. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
574. </mappers>public String toString() {
575. <mappers>
576. <typeAliases>
577. <typeAliases>
578. <mappers>
579. <mappers>
580. <mappers>
581. <settings>
582. <setting name="logImpl" value="STDOUT_LOGGING"/>
583. </settings><package name="com.Ji.dao"/>
584. </mappers><mapper />
585. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
586. </mappers><package name="com.kuang.pojo"/>
587. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
588. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
589. </mappers><mappers>
590. <typeAliases>
591. <typeAliases>
592. <mappers>
593. <mappers>
594. <mappers>
595. <settings>
596. <setting name="logImpl" value="STDOUT_LOGGING"/>
597. </settings><package name="com.Ji.dao"/>
598. </mappers><mapper />
599. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
600. </mappers><package name="com.kuang.pojo"/>
601. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
602. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
603. </mappers>return "User{" +
604. <mappers>
605. <typeAliases>
606. <typeAliases>
607. <mappers>
608. <mappers>
609. <mappers>
610. <settings>
611. <setting name="logImpl" value="STDOUT_LOGGING"/>
612. </settings><package name="com.Ji.dao"/>
613. </mappers><mapper />
614. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
615. </mappers><package name="com.kuang.pojo"/>
616. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
617. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
618. </mappers><mappers>
619. <typeAliases>
620. <typeAliases>
621. <mappers>
622. <mappers>
623. <mappers>
624. <settings>
625. <setting name="logImpl" value="STDOUT_LOGGING"/>
626. </settings><package name="com.Ji.dao"/>
627. </mappers><mapper />
628. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
629. </mappers><package name="com.kuang.pojo"/>
630. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
631. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
632. </mappers><mappers>
633. <typeAliases>
634. <typeAliases>
635. <mappers>
636. <mappers>
637. <mappers>
638. <settings>
639. <setting name="logImpl" value="STDOUT_LOGGING"/>
640. </settings><package name="com.Ji.dao"/>
641. </mappers><mapper />
642. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
643. </mappers><package name="com.kuang.pojo"/>
644. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
645. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
646. </mappers><mappers>
647. <typeAliases>
648. <typeAliases>
649. <mappers>
650. <mappers>
651. <mappers>
652. <settings>
653. <setting name="logImpl" value="STDOUT_LOGGING"/>
654. </settings><package name="com.Ji.dao"/>
655. </mappers><mapper />
656. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
657. </mappers><package name="com.kuang.pojo"/>
658. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
659. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
660. </mappers>"id=" + id +
661. <mappers>
662. <typeAliases>
663. <typeAliases>
664. <mappers>
665. <mappers>
666. <mappers>
667. <settings>
668. <setting name="logImpl" value="STDOUT_LOGGING"/>
669. </settings><package name="com.Ji.dao"/>
670. </mappers><mapper />
671. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
672. </mappers><package name="com.kuang.pojo"/>
673. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
674. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
675. </mappers><mappers>
676. <typeAliases>
677. <typeAliases>
678. <mappers>
679. <mappers>
680. <mappers>
681. <settings>
682. <setting name="logImpl" value="STDOUT_LOGGING"/>
683. </settings><package name="com.Ji.dao"/>
684. </mappers><mapper />
685. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
686. </mappers><package name="com.kuang.pojo"/>
687. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
688. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
689. </mappers><mappers>
690. <typeAliases>
691. <typeAliases>
692. <mappers>
693. <mappers>
694. <mappers>
695. <settings>
696. <setting name="logImpl" value="STDOUT_LOGGING"/>
697. </settings><package name="com.Ji.dao"/>
698. </mappers><mapper />
699. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
700. </mappers><package name="com.kuang.pojo"/>
701. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
702. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
703. </mappers><mappers>
704. <typeAliases>
705. <typeAliases>
706. <mappers>
707. <mappers>
708. <mappers>
709. <settings>
710. <setting name="logImpl" value="STDOUT_LOGGING"/>
711. </settings><package name="com.Ji.dao"/>
712. </mappers><mapper />
713. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
714. </mappers><package name="com.kuang.pojo"/>
715. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
716. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
717. </mappers>", name='" + name + '\'' +
718. <mappers>
719. <typeAliases>
720. <typeAliases>
721. <mappers>
722. <mappers>
723. <mappers>
724. <settings>
725. <setting name="logImpl" value="STDOUT_LOGGING"/>
726. </settings><package name="com.Ji.dao"/>
727. </mappers><mapper />
728. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
729. </mappers><package name="com.kuang.pojo"/>
730. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
731. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
732. </mappers><mappers>
733. <typeAliases>
734. <typeAliases>
735. <mappers>
736. <mappers>
737. <mappers>
738. <settings>
739. <setting name="logImpl" value="STDOUT_LOGGING"/>
740. </settings><package name="com.Ji.dao"/>
741. </mappers><mapper />
742. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
743. </mappers><package name="com.kuang.pojo"/>
744. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
745. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
746. </mappers><mappers>
747. <typeAliases>
748. <typeAliases>
749. <mappers>
750. <mappers>
751. <mappers>
752. <settings>
753. <setting name="logImpl" value="STDOUT_LOGGING"/>
754. </settings><package name="com.Ji.dao"/>
755. </mappers><mapper />
756. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
757. </mappers><package name="com.kuang.pojo"/>
758. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
759. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
760. </mappers><mappers>
761. <typeAliases>
762. <typeAliases>
763. <mappers>
764. <mappers>
765. <mappers>
766. <settings>
767. <setting name="logImpl" value="STDOUT_LOGGING"/>
768. </settings><package name="com.Ji.dao"/>
769. </mappers><mapper />
770. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
771. </mappers><package name="com.kuang.pojo"/>
772. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
773. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
774. </mappers>", pwd='" + pwd + '\'' +
775. <mappers>
776. <typeAliases>
777. <typeAliases>
778. <mappers>
779. <mappers>
780. <mappers>
781. <settings>
782. <setting name="logImpl" value="STDOUT_LOGGING"/>
783. </settings><package name="com.Ji.dao"/>
784. </mappers><mapper />
785. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
786. </mappers><package name="com.kuang.pojo"/>
787. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
788. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
789. </mappers><mappers>
790. <typeAliases>
791. <typeAliases>
792. <mappers>
793. <mappers>
794. <mappers>
795. <settings>
796. <setting name="logImpl" value="STDOUT_LOGGING"/>
797. </settings><package name="com.Ji.dao"/>
798. </mappers><mapper />
799. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
800. </mappers><package name="com.kuang.pojo"/>
801. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
802. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
803. </mappers><mappers>
804. <typeAliases>
805. <typeAliases>
806. <mappers>
807. <mappers>
808. <mappers>
809. <settings>
810. <setting name="logImpl" value="STDOUT_LOGGING"/>
811. </settings><package name="com.Ji.dao"/>
812. </mappers><mapper />
813. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
814. </mappers><package name="com.kuang.pojo"/>
815. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
816. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
817. </mappers><mappers>
818. <typeAliases>
819. <typeAliases>
820. <mappers>
821. <mappers>
822. <mappers>
823. <settings>
824. <setting name="logImpl" value="STDOUT_LOGGING"/>
825. </settings><package name="com.Ji.dao"/>
826. </mappers><mapper />
827. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
828. </mappers><package name="com.kuang.pojo"/>
829. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
830. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
831. </mappers>'}';
832. <mappers>
833. <typeAliases>
834. <typeAliases>
835. <mappers>
836. <mappers>
837. <mappers>
838. <settings>
839. <setting name="logImpl" value="STDOUT_LOGGING"/>
840. </settings><package name="com.Ji.dao"/>
841. </mappers><mapper />
842. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
843. </mappers><package name="com.kuang.pojo"/>
844. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
845. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
846. </mappers>}
847. }
复制代码
Dao接口
1. public interface UserDao {
2. <mappers>
3. <typeAliases>
4. <typeAliases>
5. <mappers>
6. <mappers>
7. <mappers>
8. <settings>
9. <setting name="logImpl" value="STDOUT_LOGGING"/>
10. </settings><package name="com.Ji.dao"/>
11. </mappers><mapper />
12. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
13. </mappers><package name="com.kuang.pojo"/>
14. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
15. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
16. </mappers>public List<User> getUserList();
17. }
复制代码
接口实现类（由原来的UserDaoImpl转变为一个Mapper配置文件）
1. <?xml version="1.0" encoding="UTF-8" ?>
2. <!DOCTYPE mapper
3. <mappers>
4. <typeAliases>
5. <typeAliases>
6. <mappers>
7. <mappers>
8. <mappers>
9. <settings>
10. <setting name="logImpl" value="STDOUT_LOGGING"/>
11. </settings><package name="com.Ji.dao"/>
12. </mappers><mapper />
13. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
14. </mappers><package name="com.kuang.pojo"/>
15. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
16. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
17. </mappers><mappers>
18. <typeAliases>
19. <typeAliases>
20. <mappers>
21. <mappers>
22. <mappers>
23. <settings>
24. <setting name="logImpl" value="STDOUT_LOGGING"/>
25. </settings><package name="com.Ji.dao"/>
26. </mappers><mapper />
27. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
28. </mappers><package name="com.kuang.pojo"/>
29. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
30. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
31. </mappers>PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
32. <mappers>
33. <typeAliases>
34. <typeAliases>
35. <mappers>
36. <mappers>
37. <mappers>
38. <settings>
39. <setting name="logImpl" value="STDOUT_LOGGING"/>
40. </settings><package name="com.Ji.dao"/>
41. </mappers><mapper />
42. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
43. </mappers><package name="com.kuang.pojo"/>
44. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
45. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
46. </mappers><mappers>
47. <typeAliases>
48. <typeAliases>
49. <mappers>
50. <mappers>
51. <mappers>
52. <settings>
53. <setting name="logImpl" value="STDOUT_LOGGING"/>
54. </settings><package name="com.Ji.dao"/>
55. </mappers><mapper />
56. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
57. </mappers><package name="com.kuang.pojo"/>
58. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
59. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
60. </mappers>"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
63. <mapper namespace="com.kuang.dao.UserDao">
64. <mappers>
65. <typeAliases>
66. <typeAliases>
67. <mappers>
68. <mappers>
69. <mappers>
70. <settings>
71. <setting name="logImpl" value="STDOUT_LOGGING"/>
72. </settings><package name="com.Ji.dao"/>
73. </mappers><mapper />
74. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
75. </mappers><package name="com.kuang.pojo"/>
76. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
77. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
78. </mappers><select id="getUserList" resultType="com.kuang.pojo.User">
79. <mappers>
80. <typeAliases>
81. <typeAliases>
82. <mappers>
83. <mappers>
84. <mappers>
85. <settings>
86. <setting name="logImpl" value="STDOUT_LOGGING"/>
87. </settings><package name="com.Ji.dao"/>
88. </mappers><mapper />
89. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
90. </mappers><package name="com.kuang.pojo"/>
91. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
92. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
93. </mappers>select * from USER
94. </select>
95. </mapper>
复制代码

resultType="com.Ji.pojo.User" 返回结果集

测试

注意点：
报错：org.apache.ibatis.binding.BindingException: Type interface com.kuang.dao.UserDao is not known to the MapperRegistry.
MapperRegistry是什么?
核心配置文件中注册mappers

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>

复制代码

资源过滤问题，之前在Maven中强调过！！！

junit测试
1. <mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers>@Test<mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers>public void test(){<mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers><mappers>
44. <typeAliases>
45. <typeAliases>
46. <mappers>
47. <mappers>
48. <mappers>
49. <settings>
50. <setting name="logImpl" value="STDOUT_LOGGING"/>
51. </settings><package name="com.Ji.dao"/>
52. </mappers><mapper />
53. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
54. </mappers><package name="com.kuang.pojo"/>
55. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
56. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
57. </mappers>//1.获取SqlSession对象<mappers>
58. <typeAliases>
59. <typeAliases>
60. <mappers>
61. <mappers>
62. <mappers>
63. <settings>
64. <setting name="logImpl" value="STDOUT_LOGGING"/>
65. </settings><package name="com.Ji.dao"/>
66. </mappers><mapper />
67. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
68. </mappers><package name="com.kuang.pojo"/>
69. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
70. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
71. </mappers><mappers>
72. <typeAliases>
73. <typeAliases>
74. <mappers>
75. <mappers>
76. <mappers>
77. <settings>
78. <setting name="logImpl" value="STDOUT_LOGGING"/>
79. </settings><package name="com.Ji.dao"/>
80. </mappers><mapper />
81. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
82. </mappers><package name="com.kuang.pojo"/>
83. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
84. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
85. </mappers>SqlSession sqlSession = MybatisUtils.getSqlSession();<mappers>
86. <typeAliases>
87. <typeAliases>
88. <mappers>
89. <mappers>
90. <mappers>
91. <settings>
92. <setting name="logImpl" value="STDOUT_LOGGING"/>
93. </settings><package name="com.Ji.dao"/>
94. </mappers><mapper />
95. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
96. </mappers><package name="com.kuang.pojo"/>
97. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
98. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
99. </mappers><mappers>
100. <typeAliases>
101. <typeAliases>
102. <mappers>
103. <mappers>
104. <mappers>
105. <settings>
106. <setting name="logImpl" value="STDOUT_LOGGING"/>
107. </settings><package name="com.Ji.dao"/>
108. </mappers><mapper />
109. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
110. </mappers><package name="com.kuang.pojo"/>
111. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
112. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
113. </mappers>//2.执行SQL<mappers>
114. <typeAliases>
115. <typeAliases>
116. <mappers>
117. <mappers>
118. <mappers>
119. <settings>
120. <setting name="logImpl" value="STDOUT_LOGGING"/>
121. </settings><package name="com.Ji.dao"/>
122. </mappers><mapper />
123. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
124. </mappers><package name="com.kuang.pojo"/>
125. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
126. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
127. </mappers><mappers>
128. <typeAliases>
129. <typeAliases>
130. <mappers>
131. <mappers>
132. <mappers>
133. <settings>
134. <setting name="logImpl" value="STDOUT_LOGGING"/>
135. </settings><package name="com.Ji.dao"/>
136. </mappers><mapper />
137. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
138. </mappers><package name="com.kuang.pojo"/>
139. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
140. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
141. </mappers>// 方式一：getMapper<mappers>
142. <typeAliases>
143. <typeAliases>
144. <mappers>
145. <mappers>
146. <mappers>
147. <settings>
148. <setting name="logImpl" value="STDOUT_LOGGING"/>
149. </settings><package name="com.Ji.dao"/>
150. </mappers><mapper />
151. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
152. </mappers><package name="com.kuang.pojo"/>
153. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
154. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
155. </mappers><mappers>
156. <typeAliases>
157. <typeAliases>
158. <mappers>
159. <mappers>
160. <mappers>
161. <settings>
162. <setting name="logImpl" value="STDOUT_LOGGING"/>
163. </settings><package name="com.Ji.dao"/>
164. </mappers><mapper />
165. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
166. </mappers><package name="com.kuang.pojo"/>
167. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
168. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
169. </mappers>UserDao userDao = sqlSession.getMapper(UserDao.class);<mappers>
170. <typeAliases>
171. <typeAliases>
172. <mappers>
173. <mappers>
174. <mappers>
175. <settings>
176. <setting name="logImpl" value="STDOUT_LOGGING"/>
177. </settings><package name="com.Ji.dao"/>
178. </mappers><mapper />
179. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
180. </mappers><package name="com.kuang.pojo"/>
181. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
182. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
183. </mappers><mappers>
184. <typeAliases>
185. <typeAliases>
186. <mappers>
187. <mappers>
188. <mappers>
189. <settings>
190. <setting name="logImpl" value="STDOUT_LOGGING"/>
191. </settings><package name="com.Ji.dao"/>
192. </mappers><mapper />
193. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
194. </mappers><package name="com.kuang.pojo"/>
195. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
196. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
197. </mappers>List userList = userDao.getUserList();<mappers>
198. <typeAliases>
199. <typeAliases>
200. <mappers>
201. <mappers>
202. <mappers>
203. <settings>
204. <setting name="logImpl" value="STDOUT_LOGGING"/>
205. </settings><package name="com.Ji.dao"/>
206. </mappers><mapper />
207. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
208. </mappers><package name="com.kuang.pojo"/>
209. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
210. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
211. </mappers><mappers>
212. <typeAliases>
213. <typeAliases>
214. <mappers>
215. <mappers>
216. <mappers>
217. <settings>
218. <setting name="logImpl" value="STDOUT_LOGGING"/>
219. </settings><package name="com.Ji.dao"/>
220. </mappers><mapper />
221. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
222. </mappers><package name="com.kuang.pojo"/>
223. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
224. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
225. </mappers>for (User user : userList) {<mappers>
226. <typeAliases>
227. <typeAliases>
228. <mappers>
229. <mappers>
230. <mappers>
231. <settings>
232. <setting name="logImpl" value="STDOUT_LOGGING"/>
233. </settings><package name="com.Ji.dao"/>
234. </mappers><mapper />
235. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
236. </mappers><package name="com.kuang.pojo"/>
237. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
238. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
239. </mappers><mappers>
240. <typeAliases>
241. <typeAliases>
242. <mappers>
243. <mappers>
244. <mappers>
245. <settings>
246. <setting name="logImpl" value="STDOUT_LOGGING"/>
247. </settings><package name="com.Ji.dao"/>
248. </mappers><mapper />
249. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
250. </mappers><package name="com.kuang.pojo"/>
251. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
252. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
253. </mappers><mappers>
254. <typeAliases>
255. <typeAliases>
256. <mappers>
257. <mappers>
258. <mappers>
259. <settings>
260. <setting name="logImpl" value="STDOUT_LOGGING"/>
261. </settings><package name="com.Ji.dao"/>
262. </mappers><mapper />
263. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
264. </mappers><package name="com.kuang.pojo"/>
265. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
266. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
267. </mappers>System.out.println(user);<mappers>
268. <typeAliases>
269. <typeAliases>
270. <mappers>
271. <mappers>
272. <mappers>
273. <settings>
274. <setting name="logImpl" value="STDOUT_LOGGING"/>
275. </settings><package name="com.Ji.dao"/>
276. </mappers><mapper />
277. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
278. </mappers><package name="com.kuang.pojo"/>
279. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
280. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
281. </mappers><mappers>
282. <typeAliases>
283. <typeAliases>
284. <mappers>
285. <mappers>
286. <mappers>
287. <settings>
288. <setting name="logImpl" value="STDOUT_LOGGING"/>
289. </settings><package name="com.Ji.dao"/>
290. </mappers><mapper />
291. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
292. </mappers><package name="com.kuang.pojo"/>
293. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
294. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
295. </mappers>}<mappers>
296. <typeAliases>
297. <typeAliases>
298. <mappers>
299. <mappers>
300. <mappers>
301. <settings>
302. <setting name="logImpl" value="STDOUT_LOGGING"/>
303. </settings><package name="com.Ji.dao"/>
304. </mappers><mapper />
305. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
306. </mappers><package name="com.kuang.pojo"/>
307. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
308. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
309. </mappers><mappers>
310. <typeAliases>
311. <typeAliases>
312. <mappers>
313. <mappers>
314. <mappers>
315. <settings>
316. <setting name="logImpl" value="STDOUT_LOGGING"/>
317. </settings><package name="com.Ji.dao"/>
318. </mappers><mapper />
319. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
320. </mappers><package name="com.kuang.pojo"/>
321. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
322. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
323. </mappers>//关闭sqlSession<mappers>
324. <typeAliases>
325. <typeAliases>
326. <mappers>
327. <mappers>
328. <mappers>
329. <settings>
330. <setting name="logImpl" value="STDOUT_LOGGING"/>
331. </settings><package name="com.Ji.dao"/>
332. </mappers><mapper />
333. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
334. </mappers><package name="com.kuang.pojo"/>
335. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
336. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
337. </mappers><mappers>
338. <typeAliases>
339. <typeAliases>
340. <mappers>
341. <mappers>
342. <mappers>
343. <settings>
344. <setting name="logImpl" value="STDOUT_LOGGING"/>
345. </settings><package name="com.Ji.dao"/>
346. </mappers><mapper />
347. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
348. </mappers><package name="com.kuang.pojo"/>
349. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
350. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
351. </mappers>sqlSession.close();<mappers>
352. <typeAliases>
353. <typeAliases>
354. <mappers>
355. <mappers>
356. <mappers>
357. <settings>
358. <setting name="logImpl" value="STDOUT_LOGGING"/>
359. </settings><package name="com.Ji.dao"/>
360. </mappers><mapper />
361. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
362. </mappers><package name="com.kuang.pojo"/>
363. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
364. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
365. </mappers>}
复制代码

可能会遇到的问题：
1.配置文件没有注册
2.绑定接口错误
3.方法名不对
4.返回类型不对
5.Maven导出资源问题(maven中约定大于配置，无法生效的解决方案)

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers> src/main/resources<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>**/*.properties<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>**/*.xml<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>false<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>src/main/java<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>**/*.properties<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>**/*.xml<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>false<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>

复制代码

还有一个报错就是：

将这个改为cj就好了，因为是新版本

最后得实现target中有xml才行

命名空间也要注意：

代码优化
对最新版本的Mybatis而言，用try catch finally 代码块包裹更好，官方建议

package com.Ji.dao;import com.Ji.pojo.User;import com.Ji.utils.MybatisUtils;import org.apache.ibatis.session.SqlSession;import org.junit.Test;import java.util.List;public class UserDaoTest {<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>@Test<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>public void test(){<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>//获得sqlSession对象<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>SqlSession sqlSession = MybatisUtils.getSqlSession();<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>try {<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>//方式一：getMapper<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>UserDao userDao = sqlSession.getMapper(UserDao.class);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>List userList = userDao.getUserList();//<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>//方式二,不推荐，旧版//<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>List userList = sqlSession.selectList("com.Ji.dao.UserDao.getUserList");<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>for (User user : userList) {<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>System.out.println(user);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>}<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>}catch (Exception e){<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>e.printStackTrace();<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>}finally {<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>//关闭SqlSession<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>sqlSession.close();<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>}<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>}}

复制代码

再次温习一般书写步骤

三、CURD

Ⅰnamespace

namespace中的包名要和Dao/Mapper接口的包名一致需要进行匹配，不然会报错
Ⅱselect

选择，查询语句；

id：就是对应的namespace中的方法名；
resultType : Sql语句执行的返回值；
parameterType : 参数类型；

编写接口
1. public interface UserMapper {<mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers>//查询所有用户<mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers>public List getUserList();<mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers>//插入用户<mappers>
44. <typeAliases>
45. <typeAliases>
46. <mappers>
47. <mappers>
48. <mappers>
49. <settings>
50. <setting name="logImpl" value="STDOUT_LOGGING"/>
51. </settings><package name="com.Ji.dao"/>
52. </mappers><mapper />
53. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
54. </mappers><package name="com.kuang.pojo"/>
55. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
56. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
57. </mappers>public void addUser(User user);}
复制代码
编写对应的mapper中的sql语句
1. <mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers>insert into user (id,name,pwd) values (#{id}, #{name}, #{pwd})
复制代码
测试
1. //添加用户<mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers>@Test<mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers>public void addUser(){<mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers><mappers>
44. <typeAliases>
45. <typeAliases>
46. <mappers>
47. <mappers>
48. <mappers>
49. <settings>
50. <setting name="logImpl" value="STDOUT_LOGGING"/>
51. </settings><package name="com.Ji.dao"/>
52. </mappers><mapper />
53. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
54. </mappers><package name="com.kuang.pojo"/>
55. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
56. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
57. </mappers>SqlSession sqlSession = MybatisUtils.getSqlSession();<mappers>
58. <typeAliases>
59. <typeAliases>
60. <mappers>
61. <mappers>
62. <mappers>
63. <settings>
64. <setting name="logImpl" value="STDOUT_LOGGING"/>
65. </settings><package name="com.Ji.dao"/>
66. </mappers><mapper />
67. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
68. </mappers><package name="com.kuang.pojo"/>
69. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
70. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
71. </mappers><mappers>
72. <typeAliases>
73. <typeAliases>
74. <mappers>
75. <mappers>
76. <mappers>
77. <settings>
78. <setting name="logImpl" value="STDOUT_LOGGING"/>
79. </settings><package name="com.Ji.dao"/>
80. </mappers><mapper />
81. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
82. </mappers><package name="com.kuang.pojo"/>
83. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
84. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
85. </mappers>UserMapper mapper = sqlSession.getMapper(UserMapper.class);<mappers>
86. <typeAliases>
87. <typeAliases>
88. <mappers>
89. <mappers>
90. <mappers>
91. <settings>
92. <setting name="logImpl" value="STDOUT_LOGGING"/>
93. </settings><package name="com.Ji.dao"/>
94. </mappers><mapper />
95. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
96. </mappers><package name="com.kuang.pojo"/>
97. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
98. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
99. </mappers><mappers>
100. <typeAliases>
101. <typeAliases>
102. <mappers>
103. <mappers>
104. <mappers>
105. <settings>
106. <setting name="logImpl" value="STDOUT_LOGGING"/>
107. </settings><package name="com.Ji.dao"/>
108. </mappers><mapper />
109. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
110. </mappers><package name="com.kuang.pojo"/>
111. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
112. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
113. </mappers>mapper.addUser(new User(4,"hui hui~","567"));<mappers>
114. <typeAliases>
115. <typeAliases>
116. <mappers>
117. <mappers>
118. <mappers>
119. <settings>
120. <setting name="logImpl" value="STDOUT_LOGGING"/>
121. </settings><package name="com.Ji.dao"/>
122. </mappers><mapper />
123. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
124. </mappers><package name="com.kuang.pojo"/>
125. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
126. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
127. </mappers><mappers>
128. <typeAliases>
129. <typeAliases>
130. <mappers>
131. <mappers>
132. <mappers>
133. <settings>
134. <setting name="logImpl" value="STDOUT_LOGGING"/>
135. </settings><package name="com.Ji.dao"/>
136. </mappers><mapper />
137. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
138. </mappers><package name="com.kuang.pojo"/>
139. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
140. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
141. </mappers>//增删改一定要提交事务！！！！！<mappers>
142. <typeAliases>
143. <typeAliases>
144. <mappers>
145. <mappers>
146. <mappers>
147. <settings>
148. <setting name="logImpl" value="STDOUT_LOGGING"/>
149. </settings><package name="com.Ji.dao"/>
150. </mappers><mapper />
151. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
152. </mappers><package name="com.kuang.pojo"/>
153. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
154. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
155. </mappers><mappers>
156. <typeAliases>
157. <typeAliases>
158. <mappers>
159. <mappers>
160. <mappers>
161. <settings>
162. <setting name="logImpl" value="STDOUT_LOGGING"/>
163. </settings><package name="com.Ji.dao"/>
164. </mappers><mapper />
165. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
166. </mappers><package name="com.kuang.pojo"/>
167. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
168. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
169. </mappers>sqlSession.commit();<mappers>
170. <typeAliases>
171. <typeAliases>
172. <mappers>
173. <mappers>
174. <mappers>
175. <settings>
176. <setting name="logImpl" value="STDOUT_LOGGING"/>
177. </settings><package name="com.Ji.dao"/>
178. </mappers><mapper />
179. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
180. </mappers><package name="com.kuang.pojo"/>
181. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
182. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
183. </mappers><mappers>
184. <typeAliases>
185. <typeAliases>
186. <mappers>
187. <mappers>
188. <mappers>
189. <settings>
190. <setting name="logImpl" value="STDOUT_LOGGING"/>
191. </settings><package name="com.Ji.dao"/>
192. </mappers><mapper />
193. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
194. </mappers><package name="com.kuang.pojo"/>
195. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
196. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
197. </mappers>sqlSession.close();<mappers>
198. <typeAliases>
199. <typeAliases>
200. <mappers>
201. <mappers>
202. <mappers>
203. <settings>
204. <setting name="logImpl" value="STDOUT_LOGGING"/>
205. </settings><package name="com.Ji.dao"/>
206. </mappers><mapper />
207. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
208. </mappers><package name="com.kuang.pojo"/>
209. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
210. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
211. </mappers>}
复制代码
注意：增删改查一定要提交事务：

sqlSession.commit();

复制代码

ⅢInsert

编写接口
1. public interface UserMapper {<mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers>//查询所有用户<mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers>List getUserList();<mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers>//根据ID查询用户<mappers>
44. <typeAliases>
45. <typeAliases>
46. <mappers>
47. <mappers>
48. <mappers>
49. <settings>
50. <setting name="logImpl" value="STDOUT_LOGGING"/>
51. </settings><package name="com.Ji.dao"/>
52. </mappers><mapper />
53. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
54. </mappers><package name="com.kuang.pojo"/>
55. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
56. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
57. </mappers>User getUserById(int id);<mappers>
58. <typeAliases>
59. <typeAliases>
60. <mappers>
61. <mappers>
62. <mappers>
63. <settings>
64. <setting name="logImpl" value="STDOUT_LOGGING"/>
65. </settings><package name="com.Ji.dao"/>
66. </mappers><mapper />
67. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
68. </mappers><package name="com.kuang.pojo"/>
69. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
70. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
71. </mappers>//添加用户<mappers>
72. <typeAliases>
73. <typeAliases>
74. <mappers>
75. <mappers>
76. <mappers>
77. <settings>
78. <setting name="logImpl" value="STDOUT_LOGGING"/>
79. </settings><package name="com.Ji.dao"/>
80. </mappers><mapper />
81. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
82. </mappers><package name="com.kuang.pojo"/>
83. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
84. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
85. </mappers>void addUser(User user);<mappers>
86. <typeAliases>
87. <typeAliases>
88. <mappers>
89. <mappers>
90. <mappers>
91. <settings>
92. <setting name="logImpl" value="STDOUT_LOGGING"/>
93. </settings><package name="com.Ji.dao"/>
94. </mappers><mapper />
95. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
96. </mappers><package name="com.kuang.pojo"/>
97. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
98. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
99. </mappers>}
复制代码
编写对应的mapper中的sql语句
1. <mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers><mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers><mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers><mappers>
44. <typeAliases>
45. <typeAliases>
46. <mappers>
47. <mappers>
48. <mappers>
49. <settings>
50. <setting name="logImpl" value="STDOUT_LOGGING"/>
51. </settings><package name="com.Ji.dao"/>
52. </mappers><mapper />
53. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
54. </mappers><package name="com.kuang.pojo"/>
55. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
56. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
57. </mappers>insert into mybatis.user (id,name,pwd) values (#{id}, #{name}, #{pwd});<mappers>
58. <typeAliases>
59. <typeAliases>
60. <mappers>
61. <mappers>
62. <mappers>
63. <settings>
64. <setting name="logImpl" value="STDOUT_LOGGING"/>
65. </settings><package name="com.Ji.dao"/>
66. </mappers><mapper />
67. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
68. </mappers><package name="com.kuang.pojo"/>
69. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
70. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
71. </mappers>
复制代码
测试
1. //添加用户<mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers>@Test<mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers>public void addUser(){<mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers><mappers>
44. <typeAliases>
45. <typeAliases>
46. <mappers>
47. <mappers>
48. <mappers>
49. <settings>
50. <setting name="logImpl" value="STDOUT_LOGGING"/>
51. </settings><package name="com.Ji.dao"/>
52. </mappers><mapper />
53. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
54. </mappers><package name="com.kuang.pojo"/>
55. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
56. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
57. </mappers>SqlSession sqlSession = MybatisUtils.getSqlSession();<mappers>
58. <typeAliases>
59. <typeAliases>
60. <mappers>
61. <mappers>
62. <mappers>
63. <settings>
64. <setting name="logImpl" value="STDOUT_LOGGING"/>
65. </settings><package name="com.Ji.dao"/>
66. </mappers><mapper />
67. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
68. </mappers><package name="com.kuang.pojo"/>
69. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
70. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
71. </mappers><mappers>
72. <typeAliases>
73. <typeAliases>
74. <mappers>
75. <mappers>
76. <mappers>
77. <settings>
78. <setting name="logImpl" value="STDOUT_LOGGING"/>
79. </settings><package name="com.Ji.dao"/>
80. </mappers><mapper />
81. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
82. </mappers><package name="com.kuang.pojo"/>
83. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
84. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
85. </mappers>UserMapper mapper = sqlSession.getMapper(UserMapper.class);<mappers>
86. <typeAliases>
87. <typeAliases>
88. <mappers>
89. <mappers>
90. <mappers>
91. <settings>
92. <setting name="logImpl" value="STDOUT_LOGGING"/>
93. </settings><package name="com.Ji.dao"/>
94. </mappers><mapper />
95. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
96. </mappers><package name="com.kuang.pojo"/>
97. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
98. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
99. </mappers><mappers>
100. <typeAliases>
101. <typeAliases>
102. <mappers>
103. <mappers>
104. <mappers>
105. <settings>
106. <setting name="logImpl" value="STDOUT_LOGGING"/>
107. </settings><package name="com.Ji.dao"/>
108. </mappers><mapper />
109. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
110. </mappers><package name="com.kuang.pojo"/>
111. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
112. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
113. </mappers>mapper.addUser(new User(4,"hui hui~","567"));<mappers>
114. <typeAliases>
115. <typeAliases>
116. <mappers>
117. <mappers>
118. <mappers>
119. <settings>
120. <setting name="logImpl" value="STDOUT_LOGGING"/>
121. </settings><package name="com.Ji.dao"/>
122. </mappers><mapper />
123. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
124. </mappers><package name="com.kuang.pojo"/>
125. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
126. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
127. </mappers><mappers>
128. <typeAliases>
129. <typeAliases>
130. <mappers>
131. <mappers>
132. <mappers>
133. <settings>
134. <setting name="logImpl" value="STDOUT_LOGGING"/>
135. </settings><package name="com.Ji.dao"/>
136. </mappers><mapper />
137. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
138. </mappers><package name="com.kuang.pojo"/>
139. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
140. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
141. </mappers>//增删改一定要提交事务！！！！！<mappers>
142. <typeAliases>
143. <typeAliases>
144. <mappers>
145. <mappers>
146. <mappers>
147. <settings>
148. <setting name="logImpl" value="STDOUT_LOGGING"/>
149. </settings><package name="com.Ji.dao"/>
150. </mappers><mapper />
151. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
152. </mappers><package name="com.kuang.pojo"/>
153. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
154. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
155. </mappers><mappers>
156. <typeAliases>
157. <typeAliases>
158. <mappers>
159. <mappers>
160. <mappers>
161. <settings>
162. <setting name="logImpl" value="STDOUT_LOGGING"/>
163. </settings><package name="com.Ji.dao"/>
164. </mappers><mapper />
165. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
166. </mappers><package name="com.kuang.pojo"/>
167. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
168. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
169. </mappers>sqlSession.commit();<mappers>
170. <typeAliases>
171. <typeAliases>
172. <mappers>
173. <mappers>
174. <mappers>
175. <settings>
176. <setting name="logImpl" value="STDOUT_LOGGING"/>
177. </settings><package name="com.Ji.dao"/>
178. </mappers><mapper />
179. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
180. </mappers><package name="com.kuang.pojo"/>
181. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
182. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
183. </mappers><mappers>
184. <typeAliases>
185. <typeAliases>
186. <mappers>
187. <mappers>
188. <mappers>
189. <settings>
190. <setting name="logImpl" value="STDOUT_LOGGING"/>
191. </settings><package name="com.Ji.dao"/>
192. </mappers><mapper />
193. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
194. </mappers><package name="com.kuang.pojo"/>
195. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
196. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
197. </mappers>sqlSession.close();<mappers>
198. <typeAliases>
199. <typeAliases>
200. <mappers>
201. <mappers>
202. <mappers>
203. <settings>
204. <setting name="logImpl" value="STDOUT_LOGGING"/>
205. </settings><package name="com.Ji.dao"/>
206. </mappers><mapper />
207. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
208. </mappers><package name="com.kuang.pojo"/>
209. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
210. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
211. </mappers>}
复制代码

Ⅳupdate

编写接口
1. public interface UserMapper {<mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers>//查询所有用户<mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers>List getUserList();<mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers>//根据ID查询用户<mappers>
44. <typeAliases>
45. <typeAliases>
46. <mappers>
47. <mappers>
48. <mappers>
49. <settings>
50. <setting name="logImpl" value="STDOUT_LOGGING"/>
51. </settings><package name="com.Ji.dao"/>
52. </mappers><mapper />
53. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
54. </mappers><package name="com.kuang.pojo"/>
55. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
56. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
57. </mappers>User getUserById(int id);<mappers>
58. <typeAliases>
59. <typeAliases>
60. <mappers>
61. <mappers>
62. <mappers>
63. <settings>
64. <setting name="logImpl" value="STDOUT_LOGGING"/>
65. </settings><package name="com.Ji.dao"/>
66. </mappers><mapper />
67. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
68. </mappers><package name="com.kuang.pojo"/>
69. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
70. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
71. </mappers>//添加用户<mappers>
72. <typeAliases>
73. <typeAliases>
74. <mappers>
75. <mappers>
76. <mappers>
77. <settings>
78. <setting name="logImpl" value="STDOUT_LOGGING"/>
79. </settings><package name="com.Ji.dao"/>
80. </mappers><mapper />
81. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
82. </mappers><package name="com.kuang.pojo"/>
83. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
84. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
85. </mappers>void addUser(User user);<mappers>
86. <typeAliases>
87. <typeAliases>
88. <mappers>
89. <mappers>
90. <mappers>
91. <settings>
92. <setting name="logImpl" value="STDOUT_LOGGING"/>
93. </settings><package name="com.Ji.dao"/>
94. </mappers><mapper />
95. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
96. </mappers><package name="com.kuang.pojo"/>
97. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
98. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
99. </mappers>//修改用户<mappers>
100. <typeAliases>
101. <typeAliases>
102. <mappers>
103. <mappers>
104. <mappers>
105. <settings>
106. <setting name="logImpl" value="STDOUT_LOGGING"/>
107. </settings><package name="com.Ji.dao"/>
108. </mappers><mapper />
109. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
110. </mappers><package name="com.kuang.pojo"/>
111. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
112. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
113. </mappers>void updateUser(User user);}
复制代码
编写对应的mapper中的sql语句
1. <mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers><mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers><mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers><mappers>
44. <typeAliases>
45. <typeAliases>
46. <mappers>
47. <mappers>
48. <mappers>
49. <settings>
50. <setting name="logImpl" value="STDOUT_LOGGING"/>
51. </settings><package name="com.Ji.dao"/>
52. </mappers><mapper />
53. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
54. </mappers><package name="com.kuang.pojo"/>
55. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
56. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
57. </mappers>update mybatis.user<mappers>
58. <typeAliases>
59. <typeAliases>
60. <mappers>
61. <mappers>
62. <mappers>
63. <settings>
64. <setting name="logImpl" value="STDOUT_LOGGING"/>
65. </settings><package name="com.Ji.dao"/>
66. </mappers><mapper />
67. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
68. </mappers><package name="com.kuang.pojo"/>
69. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
70. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
71. </mappers><mappers>
72. <typeAliases>
73. <typeAliases>
74. <mappers>
75. <mappers>
76. <mappers>
77. <settings>
78. <setting name="logImpl" value="STDOUT_LOGGING"/>
79. </settings><package name="com.Ji.dao"/>
80. </mappers><mapper />
81. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
82. </mappers><package name="com.kuang.pojo"/>
83. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
84. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
85. </mappers>set name = #{name}, pwd = #{pwd}<mappers>
86. <typeAliases>
87. <typeAliases>
88. <mappers>
89. <mappers>
90. <mappers>
91. <settings>
92. <setting name="logImpl" value="STDOUT_LOGGING"/>
93. </settings><package name="com.Ji.dao"/>
94. </mappers><mapper />
95. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
96. </mappers><package name="com.kuang.pojo"/>
97. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
98. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
99. </mappers><mappers>
100. <typeAliases>
101. <typeAliases>
102. <mappers>
103. <mappers>
104. <mappers>
105. <settings>
106. <setting name="logImpl" value="STDOUT_LOGGING"/>
107. </settings><package name="com.Ji.dao"/>
108. </mappers><mapper />
109. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
110. </mappers><package name="com.kuang.pojo"/>
111. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
112. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
113. </mappers>where id = #{id};<mappers>
114. <typeAliases>
115. <typeAliases>
116. <mappers>
117. <mappers>
118. <mappers>
119. <settings>
120. <setting name="logImpl" value="STDOUT_LOGGING"/>
121. </settings><package name="com.Ji.dao"/>
122. </mappers><mapper />
123. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
124. </mappers><package name="com.kuang.pojo"/>
125. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
126. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
127. </mappers>
复制代码
测试
1. //更新用户<mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers>@Test<mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers>public void updateUser(){<mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers><mappers>
44. <typeAliases>
45. <typeAliases>
46. <mappers>
47. <mappers>
48. <mappers>
49. <settings>
50. <setting name="logImpl" value="STDOUT_LOGGING"/>
51. </settings><package name="com.Ji.dao"/>
52. </mappers><mapper />
53. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
54. </mappers><package name="com.kuang.pojo"/>
55. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
56. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
57. </mappers>SqlSession sqlSession = MybatisUtils.getSqlSession();<mappers>
58. <typeAliases>
59. <typeAliases>
60. <mappers>
61. <mappers>
62. <mappers>
63. <settings>
64. <setting name="logImpl" value="STDOUT_LOGGING"/>
65. </settings><package name="com.Ji.dao"/>
66. </mappers><mapper />
67. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
68. </mappers><package name="com.kuang.pojo"/>
69. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
70. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
71. </mappers><mappers>
72. <typeAliases>
73. <typeAliases>
74. <mappers>
75. <mappers>
76. <mappers>
77. <settings>
78. <setting name="logImpl" value="STDOUT_LOGGING"/>
79. </settings><package name="com.Ji.dao"/>
80. </mappers><mapper />
81. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
82. </mappers><package name="com.kuang.pojo"/>
83. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
84. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
85. </mappers>UserMapper mapper = sqlSession.getMapper(UserMapper.class);<mappers>
86. <typeAliases>
87. <typeAliases>
88. <mappers>
89. <mappers>
90. <mappers>
91. <settings>
92. <setting name="logImpl" value="STDOUT_LOGGING"/>
93. </settings><package name="com.Ji.dao"/>
94. </mappers><mapper />
95. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
96. </mappers><package name="com.kuang.pojo"/>
97. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
98. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
99. </mappers><mappers>
100. <typeAliases>
101. <typeAliases>
102. <mappers>
103. <mappers>
104. <mappers>
105. <settings>
106. <setting name="logImpl" value="STDOUT_LOGGING"/>
107. </settings><package name="com.Ji.dao"/>
108. </mappers><mapper />
109. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
110. </mappers><package name="com.kuang.pojo"/>
111. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
112. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
113. </mappers>mapper.updateUser(new User(4,"yh","111"));<mappers>
114. <typeAliases>
115. <typeAliases>
116. <mappers>
117. <mappers>
118. <mappers>
119. <settings>
120. <setting name="logImpl" value="STDOUT_LOGGING"/>
121. </settings><package name="com.Ji.dao"/>
122. </mappers><mapper />
123. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
124. </mappers><package name="com.kuang.pojo"/>
125. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
126. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
127. </mappers><mappers>
128. <typeAliases>
129. <typeAliases>
130. <mappers>
131. <mappers>
132. <mappers>
133. <settings>
134. <setting name="logImpl" value="STDOUT_LOGGING"/>
135. </settings><package name="com.Ji.dao"/>
136. </mappers><mapper />
137. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
138. </mappers><package name="com.kuang.pojo"/>
139. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
140. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
141. </mappers>sqlSession.commit();<mappers>
142. <typeAliases>
143. <typeAliases>
144. <mappers>
145. <mappers>
146. <mappers>
147. <settings>
148. <setting name="logImpl" value="STDOUT_LOGGING"/>
149. </settings><package name="com.Ji.dao"/>
150. </mappers><mapper />
151. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
152. </mappers><package name="com.kuang.pojo"/>
153. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
154. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
155. </mappers><mappers>
156. <typeAliases>
157. <typeAliases>
158. <mappers>
159. <mappers>
160. <mappers>
161. <settings>
162. <setting name="logImpl" value="STDOUT_LOGGING"/>
163. </settings><package name="com.Ji.dao"/>
164. </mappers><mapper />
165. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
166. </mappers><package name="com.kuang.pojo"/>
167. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
168. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
169. </mappers>sqlSession.close();<mappers>
170. <typeAliases>
171. <typeAliases>
172. <mappers>
173. <mappers>
174. <mappers>
175. <settings>
176. <setting name="logImpl" value="STDOUT_LOGGING"/>
177. </settings><package name="com.Ji.dao"/>
178. </mappers><mapper />
179. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
180. </mappers><package name="com.kuang.pojo"/>
181. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
182. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
183. </mappers>}
复制代码

ⅤDelete

编写接口
1. public interface UserMapper {<mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers>//查询所有用户<mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers>List getUserList();<mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers>//根据ID查询用户<mappers>
44. <typeAliases>
45. <typeAliases>
46. <mappers>
47. <mappers>
48. <mappers>
49. <settings>
50. <setting name="logImpl" value="STDOUT_LOGGING"/>
51. </settings><package name="com.Ji.dao"/>
52. </mappers><mapper />
53. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
54. </mappers><package name="com.kuang.pojo"/>
55. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
56. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
57. </mappers>User getUserById(int id);<mappers>
58. <typeAliases>
59. <typeAliases>
60. <mappers>
61. <mappers>
62. <mappers>
63. <settings>
64. <setting name="logImpl" value="STDOUT_LOGGING"/>
65. </settings><package name="com.Ji.dao"/>
66. </mappers><mapper />
67. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
68. </mappers><package name="com.kuang.pojo"/>
69. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
70. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
71. </mappers>//添加用户<mappers>
72. <typeAliases>
73. <typeAliases>
74. <mappers>
75. <mappers>
76. <mappers>
77. <settings>
78. <setting name="logImpl" value="STDOUT_LOGGING"/>
79. </settings><package name="com.Ji.dao"/>
80. </mappers><mapper />
81. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
82. </mappers><package name="com.kuang.pojo"/>
83. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
84. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
85. </mappers>void addUser(User user);<mappers>
86. <typeAliases>
87. <typeAliases>
88. <mappers>
89. <mappers>
90. <mappers>
91. <settings>
92. <setting name="logImpl" value="STDOUT_LOGGING"/>
93. </settings><package name="com.Ji.dao"/>
94. </mappers><mapper />
95. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
96. </mappers><package name="com.kuang.pojo"/>
97. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
98. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
99. </mappers>//修改用户<mappers>
100. <typeAliases>
101. <typeAliases>
102. <mappers>
103. <mappers>
104. <mappers>
105. <settings>
106. <setting name="logImpl" value="STDOUT_LOGGING"/>
107. </settings><package name="com.Ji.dao"/>
108. </mappers><mapper />
109. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
110. </mappers><package name="com.kuang.pojo"/>
111. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
112. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
113. </mappers>void updateUser(User user);<mappers>
114. <typeAliases>
115. <typeAliases>
116. <mappers>
117. <mappers>
118. <mappers>
119. <settings>
120. <setting name="logImpl" value="STDOUT_LOGGING"/>
121. </settings><package name="com.Ji.dao"/>
122. </mappers><mapper />
123. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
124. </mappers><package name="com.kuang.pojo"/>
125. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
126. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
127. </mappers>//删除用户<mappers>
128. <typeAliases>
129. <typeAliases>
130. <mappers>
131. <mappers>
132. <mappers>
133. <settings>
134. <setting name="logImpl" value="STDOUT_LOGGING"/>
135. </settings><package name="com.Ji.dao"/>
136. </mappers><mapper />
137. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
138. </mappers><package name="com.kuang.pojo"/>
139. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
140. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
141. </mappers>void deleteUser(int id);}
复制代码
编写对应的mapper中的sql语句
1. <mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers><mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers><mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers><mappers>
44. <typeAliases>
45. <typeAliases>
46. <mappers>
47. <mappers>
48. <mappers>
49. <settings>
50. <setting name="logImpl" value="STDOUT_LOGGING"/>
51. </settings><package name="com.Ji.dao"/>
52. </mappers><mapper />
53. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
54. </mappers><package name="com.kuang.pojo"/>
55. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
56. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
57. </mappers>delete from mybatis.user where id = #{id};<mappers>
58. <typeAliases>
59. <typeAliases>
60. <mappers>
61. <mappers>
62. <mappers>
63. <settings>
64. <setting name="logImpl" value="STDOUT_LOGGING"/>
65. </settings><package name="com.Ji.dao"/>
66. </mappers><mapper />
67. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
68. </mappers><package name="com.kuang.pojo"/>
69. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
70. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
71. </mappers>
复制代码
测试
1. //删除用户<mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers>@Test<mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers>public void deleteUser(){<mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers><mappers>
44. <typeAliases>
45. <typeAliases>
46. <mappers>
47. <mappers>
48. <mappers>
49. <settings>
50. <setting name="logImpl" value="STDOUT_LOGGING"/>
51. </settings><package name="com.Ji.dao"/>
52. </mappers><mapper />
53. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
54. </mappers><package name="com.kuang.pojo"/>
55. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
56. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
57. </mappers>SqlSession sqlSession = MybatisUtils.getSqlSession();<mappers>
58. <typeAliases>
59. <typeAliases>
60. <mappers>
61. <mappers>
62. <mappers>
63. <settings>
64. <setting name="logImpl" value="STDOUT_LOGGING"/>
65. </settings><package name="com.Ji.dao"/>
66. </mappers><mapper />
67. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
68. </mappers><package name="com.kuang.pojo"/>
69. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
70. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
71. </mappers><mappers>
72. <typeAliases>
73. <typeAliases>
74. <mappers>
75. <mappers>
76. <mappers>
77. <settings>
78. <setting name="logImpl" value="STDOUT_LOGGING"/>
79. </settings><package name="com.Ji.dao"/>
80. </mappers><mapper />
81. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
82. </mappers><package name="com.kuang.pojo"/>
83. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
84. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
85. </mappers>UserMapper mapper = sqlSession.getMapper(UserMapper.class);<mappers>
86. <typeAliases>
87. <typeAliases>
88. <mappers>
89. <mappers>
90. <mappers>
91. <settings>
92. <setting name="logImpl" value="STDOUT_LOGGING"/>
93. </settings><package name="com.Ji.dao"/>
94. </mappers><mapper />
95. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
96. </mappers><package name="com.kuang.pojo"/>
97. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
98. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
99. </mappers><mappers>
100. <typeAliases>
101. <typeAliases>
102. <mappers>
103. <mappers>
104. <mappers>
105. <settings>
106. <setting name="logImpl" value="STDOUT_LOGGING"/>
107. </settings><package name="com.Ji.dao"/>
108. </mappers><mapper />
109. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
110. </mappers><package name="com.kuang.pojo"/>
111. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
112. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
113. </mappers>mapper.deleteUser(4);<mappers>
114. <typeAliases>
115. <typeAliases>
116. <mappers>
117. <mappers>
118. <mappers>
119. <settings>
120. <setting name="logImpl" value="STDOUT_LOGGING"/>
121. </settings><package name="com.Ji.dao"/>
122. </mappers><mapper />
123. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
124. </mappers><package name="com.kuang.pojo"/>
125. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
126. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
127. </mappers><mappers>
128. <typeAliases>
129. <typeAliases>
130. <mappers>
131. <mappers>
132. <mappers>
133. <settings>
134. <setting name="logImpl" value="STDOUT_LOGGING"/>
135. </settings><package name="com.Ji.dao"/>
136. </mappers><mapper />
137. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
138. </mappers><package name="com.kuang.pojo"/>
139. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
140. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
141. </mappers>sqlSession.commit();<mappers>
142. <typeAliases>
143. <typeAliases>
144. <mappers>
145. <mappers>
146. <mappers>
147. <settings>
148. <setting name="logImpl" value="STDOUT_LOGGING"/>
149. </settings><package name="com.Ji.dao"/>
150. </mappers><mapper />
151. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
152. </mappers><package name="com.kuang.pojo"/>
153. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
154. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
155. </mappers><mappers>
156. <typeAliases>
157. <typeAliases>
158. <mappers>
159. <mappers>
160. <mappers>
161. <settings>
162. <setting name="logImpl" value="STDOUT_LOGGING"/>
163. </settings><package name="com.Ji.dao"/>
164. </mappers><mapper />
165. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
166. </mappers><package name="com.kuang.pojo"/>
167. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
168. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
169. </mappers>sqlSession.close();<mappers>
170. <typeAliases>
171. <typeAliases>
172. <mappers>
173. <mappers>
174. <mappers>
175. <settings>
176. <setting name="logImpl" value="STDOUT_LOGGING"/>
177. </settings><package name="com.Ji.dao"/>
178. </mappers><mapper />
179. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
180. </mappers><package name="com.kuang.pojo"/>
181. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
182. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
183. </mappers>}
复制代码

Ⅵ万能Map

假设，我们的实体类，或者数据库中的表，字段或者参数过多，我们应该考虑使用Map!

UserMapper接口
1. //用万能Map插入用户
2. public void addUser2(Map<String,Object> map);
复制代码
UserMapper.xml
1. <mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers><mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers><mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers><mappers>
44. <typeAliases>
45. <typeAliases>
46. <mappers>
47. <mappers>
48. <mappers>
49. <settings>
50. <setting name="logImpl" value="STDOUT_LOGGING"/>
51. </settings><package name="com.Ji.dao"/>
52. </mappers><mapper />
53. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
54. </mappers><package name="com.kuang.pojo"/>
55. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
56. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
57. </mappers>insert into user (id,name,password) values (#{userid},#{username},#{password});<mappers>
58. <typeAliases>
59. <typeAliases>
60. <mappers>
61. <mappers>
62. <mappers>
63. <settings>
64. <setting name="logImpl" value="STDOUT_LOGGING"/>
65. </settings><package name="com.Ji.dao"/>
66. </mappers><mapper />
67. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
68. </mappers><package name="com.kuang.pojo"/>
69. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
70. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
71. </mappers>
复制代码
测试
1. //Mapper方法测试@Testpublic void addUser2(){<mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers>SqlSession sqlSession = MybatisUtils.getSqlSession();<mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers>UserMapper mapper = sqlSession.getMapper(UserMapper.class);<mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers>HashMap map = new HashMap();<mappers>
44. <typeAliases>
45. <typeAliases>
46. <mappers>
47. <mappers>
48. <mappers>
49. <settings>
50. <setting name="logImpl" value="STDOUT_LOGGING"/>
51. </settings><package name="com.Ji.dao"/>
52. </mappers><mapper />
53. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
54. </mappers><package name="com.kuang.pojo"/>
55. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
56. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
57. </mappers>map.put("userid",4);<mappers>
58. <typeAliases>
59. <typeAliases>
60. <mappers>
61. <mappers>
62. <mappers>
63. <settings>
64. <setting name="logImpl" value="STDOUT_LOGGING"/>
65. </settings><package name="com.Ji.dao"/>
66. </mappers><mapper />
67. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
68. </mappers><package name="com.kuang.pojo"/>
69. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
70. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
71. </mappers>map.put("username","yuanHui");<mappers>
72. <typeAliases>
73. <typeAliases>
74. <mappers>
75. <mappers>
76. <mappers>
77. <settings>
78. <setting name="logImpl" value="STDOUT_LOGGING"/>
79. </settings><package name="com.Ji.dao"/>
80. </mappers><mapper />
81. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
82. </mappers><package name="com.kuang.pojo"/>
83. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
84. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
85. </mappers>map.put("password",789);<mappers>
86. <typeAliases>
87. <typeAliases>
88. <mappers>
89. <mappers>
90. <mappers>
91. <settings>
92. <setting name="logImpl" value="STDOUT_LOGGING"/>
93. </settings><package name="com.Ji.dao"/>
94. </mappers><mapper />
95. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
96. </mappers><package name="com.kuang.pojo"/>
97. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
98. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
99. </mappers>mapper.addUser2(map);<mappers>
100. <typeAliases>
101. <typeAliases>
102. <mappers>
103. <mappers>
104. <mappers>
105. <settings>
106. <setting name="logImpl" value="STDOUT_LOGGING"/>
107. </settings><package name="com.Ji.dao"/>
108. </mappers><mapper />
109. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
110. </mappers><package name="com.kuang.pojo"/>
111. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
112. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
113. </mappers>//增删改一定要提交事务！！！！！<mappers>
114. <typeAliases>
115. <typeAliases>
116. <mappers>
117. <mappers>
118. <mappers>
119. <settings>
120. <setting name="logImpl" value="STDOUT_LOGGING"/>
121. </settings><package name="com.Ji.dao"/>
122. </mappers><mapper />
123. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
124. </mappers><package name="com.kuang.pojo"/>
125. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
126. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
127. </mappers>sqlSession.commit();<mappers>
128. <typeAliases>
129. <typeAliases>
130. <mappers>
131. <mappers>
132. <mappers>
133. <settings>
134. <setting name="logImpl" value="STDOUT_LOGGING"/>
135. </settings><package name="com.Ji.dao"/>
136. </mappers><mapper />
137. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
138. </mappers><package name="com.kuang.pojo"/>
139. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
140. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
141. </mappers>sqlSession.close();}
复制代码
Map传递参数，直接在sql中取出key即可！【parameter=“map”】
对象传递参数，直接在sql中取出对象的属性即可！【parameter=“Object”】
只有一个基本类型参数的情况下，可以直接在sql中取到多个参数用Map , 或者注解！

Ⅶ模糊查询

模糊查询这么写？

Java代码执行的时候，传递通配符% %
1. List<User> userList = mapper.getUserLike("%李%");
复制代码
在sql拼接中使用通配符
1. select * from user where name like #{value}
复制代码
代码
1. <mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers>//模糊查询的实现<mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers>List getUserLike(String value);
复制代码
1. <mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers><mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers><mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers><mappers>
44. <typeAliases>
45. <typeAliases>
46. <mappers>
47. <mappers>
48. <mappers>
49. <settings>
50. <setting name="logImpl" value="STDOUT_LOGGING"/>
51. </settings><package name="com.Ji.dao"/>
52. </mappers><mapper />
53. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
54. </mappers><package name="com.kuang.pojo"/>
55. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
56. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
57. </mappers><mappers>
58. <typeAliases>
59. <typeAliases>
60. <mappers>
61. <mappers>
62. <mappers>
63. <settings>
64. <setting name="logImpl" value="STDOUT_LOGGING"/>
65. </settings><package name="com.Ji.dao"/>
66. </mappers><mapper />
67. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
68. </mappers><package name="com.kuang.pojo"/>
69. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
70. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
71. </mappers> select * from mybatis.user where name like #{value};<mappers>
72. <typeAliases>
73. <typeAliases>
74. <mappers>
75. <mappers>
76. <mappers>
77. <settings>
78. <setting name="logImpl" value="STDOUT_LOGGING"/>
79. </settings><package name="com.Ji.dao"/>
80. </mappers><mapper />
81. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
82. </mappers><package name="com.kuang.pojo"/>
83. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
84. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
85. </mappers><mappers>
86. <typeAliases>
87. <typeAliases>
88. <mappers>
89. <mappers>
90. <mappers>
91. <settings>
92. <setting name="logImpl" value="STDOUT_LOGGING"/>
93. </settings><package name="com.Ji.dao"/>
94. </mappers><mapper />
95. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
96. </mappers><package name="com.kuang.pojo"/>
97. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
98. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
99. </mappers>
复制代码
1. <mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers>//测试模糊查询<mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers>@Test<mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers>public void getUserLike() {<mappers>
44. <typeAliases>
45. <typeAliases>
46. <mappers>
47. <mappers>
48. <mappers>
49. <settings>
50. <setting name="logImpl" value="STDOUT_LOGGING"/>
51. </settings><package name="com.Ji.dao"/>
52. </mappers><mapper />
53. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
54. </mappers><package name="com.kuang.pojo"/>
55. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
56. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
57. </mappers><mappers>
58. <typeAliases>
59. <typeAliases>
60. <mappers>
61. <mappers>
62. <mappers>
63. <settings>
64. <setting name="logImpl" value="STDOUT_LOGGING"/>
65. </settings><package name="com.Ji.dao"/>
66. </mappers><mapper />
67. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
68. </mappers><package name="com.kuang.pojo"/>
69. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
70. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
71. </mappers>SqlSession sqlSession = MybatisUtils.getSqlSession();<mappers>
72. <typeAliases>
73. <typeAliases>
74. <mappers>
75. <mappers>
76. <mappers>
77. <settings>
78. <setting name="logImpl" value="STDOUT_LOGGING"/>
79. </settings><package name="com.Ji.dao"/>
80. </mappers><mapper />
81. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
82. </mappers><package name="com.kuang.pojo"/>
83. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
84. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
85. </mappers><mappers>
86. <typeAliases>
87. <typeAliases>
88. <mappers>
89. <mappers>
90. <mappers>
91. <settings>
92. <setting name="logImpl" value="STDOUT_LOGGING"/>
93. </settings><package name="com.Ji.dao"/>
94. </mappers><mapper />
95. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
96. </mappers><package name="com.kuang.pojo"/>
97. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
98. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
99. </mappers>UserMapper mapper = sqlSession.getMapper(UserMapper.class);<mappers>
100. <typeAliases>
101. <typeAliases>
102. <mappers>
103. <mappers>
104. <mappers>
105. <settings>
106. <setting name="logImpl" value="STDOUT_LOGGING"/>
107. </settings><package name="com.Ji.dao"/>
108. </mappers><mapper />
109. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
110. </mappers><package name="com.kuang.pojo"/>
111. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
112. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
113. </mappers><mappers>
114. <typeAliases>
115. <typeAliases>
116. <mappers>
117. <mappers>
118. <mappers>
119. <settings>
120. <setting name="logImpl" value="STDOUT_LOGGING"/>
121. </settings><package name="com.Ji.dao"/>
122. </mappers><mapper />
123. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
124. </mappers><package name="com.kuang.pojo"/>
125. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
126. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
127. </mappers>List<User> userList = mapper.getUserLike("%李%");<mappers>
128. <typeAliases>
129. <typeAliases>
130. <mappers>
131. <mappers>
132. <mappers>
133. <settings>
134. <setting name="logImpl" value="STDOUT_LOGGING"/>
135. </settings><package name="com.Ji.dao"/>
136. </mappers><mapper />
137. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
138. </mappers><package name="com.kuang.pojo"/>
139. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
140. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
141. </mappers><mappers>
142. <typeAliases>
143. <typeAliases>
144. <mappers>
145. <mappers>
146. <mappers>
147. <settings>
148. <setting name="logImpl" value="STDOUT_LOGGING"/>
149. </settings><package name="com.Ji.dao"/>
150. </mappers><mapper />
151. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
152. </mappers><package name="com.kuang.pojo"/>
153. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
154. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
155. </mappers>for (User user : userList) {<mappers>
156. <typeAliases>
157. <typeAliases>
158. <mappers>
159. <mappers>
160. <mappers>
161. <settings>
162. <setting name="logImpl" value="STDOUT_LOGGING"/>
163. </settings><package name="com.Ji.dao"/>
164. </mappers><mapper />
165. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
166. </mappers><package name="com.kuang.pojo"/>
167. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
168. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
169. </mappers><mappers>
170. <typeAliases>
171. <typeAliases>
172. <mappers>
173. <mappers>
174. <mappers>
175. <settings>
176. <setting name="logImpl" value="STDOUT_LOGGING"/>
177. </settings><package name="com.Ji.dao"/>
178. </mappers><mapper />
179. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
180. </mappers><package name="com.kuang.pojo"/>
181. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
182. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
183. </mappers><mappers>
184. <typeAliases>
185. <typeAliases>
186. <mappers>
187. <mappers>
188. <mappers>
189. <settings>
190. <setting name="logImpl" value="STDOUT_LOGGING"/>
191. </settings><package name="com.Ji.dao"/>
192. </mappers><mapper />
193. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
194. </mappers><package name="com.kuang.pojo"/>
195. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
196. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
197. </mappers>System.out.println(user);<mappers>
198. <typeAliases>
199. <typeAliases>
200. <mappers>
201. <mappers>
202. <mappers>
203. <settings>
204. <setting name="logImpl" value="STDOUT_LOGGING"/>
205. </settings><package name="com.Ji.dao"/>
206. </mappers><mapper />
207. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
208. </mappers><package name="com.kuang.pojo"/>
209. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
210. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
211. </mappers><mappers>
212. <typeAliases>
213. <typeAliases>
214. <mappers>
215. <mappers>
216. <mappers>
217. <settings>
218. <setting name="logImpl" value="STDOUT_LOGGING"/>
219. </settings><package name="com.Ji.dao"/>
220. </mappers><mapper />
221. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
222. </mappers><package name="com.kuang.pojo"/>
223. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
224. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
225. </mappers>}<mappers>
226. <typeAliases>
227. <typeAliases>
228. <mappers>
229. <mappers>
230. <mappers>
231. <settings>
232. <setting name="logImpl" value="STDOUT_LOGGING"/>
233. </settings><package name="com.Ji.dao"/>
234. </mappers><mapper />
235. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
236. </mappers><package name="com.kuang.pojo"/>
237. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
238. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
239. </mappers><mappers>
240. <typeAliases>
241. <typeAliases>
242. <mappers>
243. <mappers>
244. <mappers>
245. <settings>
246. <setting name="logImpl" value="STDOUT_LOGGING"/>
247. </settings><package name="com.Ji.dao"/>
248. </mappers><mapper />
249. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
250. </mappers><package name="com.kuang.pojo"/>
251. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
252. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
253. </mappers>sqlSession.close();<mappers>
254. <typeAliases>
255. <typeAliases>
256. <mappers>
257. <mappers>
258. <mappers>
259. <settings>
260. <setting name="logImpl" value="STDOUT_LOGGING"/>
261. </settings><package name="com.Ji.dao"/>
262. </mappers><mapper />
263. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
264. </mappers><package name="com.kuang.pojo"/>
265. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
266. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
267. </mappers>}
复制代码

注意点：
{} 就是编译好SQL语句再取值.

${} 就是取值以后再去编译SQL语句.
所以#{}不存在sql注入问题
四、配置解析

Ⅰ核心配置文件

官方建议使用mybatis-config.xml的名称
Mybatis的配置文件包含了会深深影响MyBatis行为的设置和属性信息。

configuration（配置）
properties（属性）
settings（设置）
typeAliases（类型别名）
typeHandlers（类型处理器）
objectFactory（对象工厂）
plugins（插件）
environments（环境配置）
environment（环境变量）
transactionManager（事务管理器）
dataSource（数据源）
databaseIdProvider（数据库厂商标识）
mappers（映射器）

Ⅱ环境配置 (environments)

MyBatis 可以配置成适应多种环境
不过要记住：尽管可以配置多个环境，但每个 SqlSessionFactory 实例只能选择一种环境
学会使用配置多套运行环境！

MyBatis默认的事务管理器就是JDBC ，连接池：POOLED

Ⅲ属性 (properties)

我们可以通过properties属性来实现引用配置文件
这些属性可以在外部进行配置，并可以进行动态替换。你既可以在典型的 Java 属性文件中配置这些属性，也可以在 properties 元素的子元素中设置。
即：【db.poperties】
1.编写一个配置文件

driver=com.mysql.cj.jdbc.Driver
url=jdbc:mysql://localhost:3306/mybatis?userSSL=true&useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC
username=root
password=root

复制代码

1.可以直接引入外部文件 (比如我们把db.properties的文件如上重新注册一遍)
2.可以在其中增加一些属性配置（可以在db.properties中写一半，再在xml中进行配置）

3.如果两个文件有同一个字段，优先使用外部配置文件的（同时设置了pwd，首先使用外部文件的！！！)

Ⅳ类型别名（typeAliases）

类型别名可为 Java 类型设置一个缩写名字。它仅用于 XML 配置.
意在降低冗余的全限定类名书写。
1. <mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers>
复制代码

也可以指定一个包，每一个在包 domain.blog 中的 Java Bean，在没有注解的情况下，会使用 Bean 的首字母小写的非限定类名来作为它的别名。比如 domain.blog.Author 的别名为 author,；若有注解，则别名为其注解值。见下面的例子：

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>

复制代码

在实体类比较少的时候，使用第一种方式。如果实体类十分多，建议用第二种扫描包的方式。
第一种可以DIY别名，第二种不行，如果非要改，需要在实体上增加注解。(增加注解后我们放在config里面的!

@Alias("author")public class Author {<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>...}

复制代码

Ⅴ设置（Settings）

Ⅵ其他配置

typeHandlers（类型处理器）
objectFactory（对象工厂）
plugins 插件
- mybatis-generator-core
- mybatis-plus
- 通用mapper

Ⅶ映射器（mappers）

MapperRegistry：注册绑定我们的Mapper文件；

方式一：【推荐使用】

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>

复制代码

方式二：使用class文件绑定注册(步骤比较繁琐)<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers> 实际应用中常常会用到

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>

复制代码

注意点：

接口和他的Mapper配置文件必须同名（就是你不能写一个UserDao的接口，然后xml里面注册的时UserMapper.xml，两个文件名称必须相同）
接口和他的Mapper配置文件必须在同一个包下

方式三：使用包扫描进行注入

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>

复制代码

Ⅷ作用域和生命周期

生命周期和作用域是至关重要的，因为错误的使用会导致非常严重的并发问题。
流程分析：

SqlSessionFactoryBuilder:

一旦创建了SqlSessionFactory，就不再需要它了
局部变量
SqlSessionFactory:
说白了就可以想象为：数据库连接池
SqlSessionFactory一旦被创建就应该在应用的运行期间一直存在，没有任何理由丢弃它或重新创建一个实例。
因此SqlSessionFactory的最佳作用域是应用作用域（ApplocationContext）。程序开始就执行，程序结束就结束
最简单的就是使用单例模式或静态单例模式。

SqlSession：

连接到连接池的一个请求（直到程序结束时就不存在了）
SqlSession 的实例不是线程安全的，因此是不能被共享的，所以它的最佳的作用域是请求或方法作用域。
用完之后需要赶紧关闭，否则资源被占用！

图示理解：

五、解决属性名和字段不一样的问题

Ⅰ问题

数据库中的字段

//实体类public class User {<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>private int id;<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>private String name;<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>private String password ;//把之前的pwd改成了password}

复制代码

新建一个项目，拷贝之前的，测试实体类字段不一致的情况
测试出现问题

select * from user where id = #{id}
类型处理器
//原本的查询语句查不出来我们没有一一对应的字段，因此我们需要类型处理器来处理与数据库的问题
select id,name,pwd from user where id = #{id}

复制代码

解决方法：

起别名
1. <mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers>select id,name,pwd as password from USER where id = #{id}
复制代码

ⅡresultMap

结果集映射:让数据库中的实体类映射到xml中

id name pwd 我们xml需求的
id name password 我们实体类中存在的

复制代码

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>select * from USER where id = #{id}<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>

复制代码

resultMap 元素是 MyBatis 中最重要最强大的元素。
ResultMap 的设计思想是，对简单的语句做到零配置，对于复杂一点的语句，只需要描述语句之间的关系就行了。（结果集映射）
ResultMap 的优秀之处——你完全可以不用显式地配置它们。（即：我们只需要动变过的东西就好了，已经定义好的东西不需要改变）
1. <mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers><mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers><mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers><mappers>
44. <typeAliases>
45. <typeAliases>
46. <mappers>
47. <mappers>
48. <mappers>
49. <settings>
50. <setting name="logImpl" value="STDOUT_LOGGING"/>
51. </settings><package name="com.Ji.dao"/>
52. </mappers><mapper />
53. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
54. </mappers><package name="com.kuang.pojo"/>
55. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
56. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
57. </mappers><mappers>
58. <typeAliases>
59. <typeAliases>
60. <mappers>
61. <mappers>
62. <mappers>
63. <settings>
64. <setting name="logImpl" value="STDOUT_LOGGING"/>
65. </settings><package name="com.Ji.dao"/>
66. </mappers><mapper />
67. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
68. </mappers><package name="com.kuang.pojo"/>
69. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
70. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
71. </mappers><mappers>
72. <typeAliases>
73. <typeAliases>
74. <mappers>
75. <mappers>
76. <mappers>
77. <settings>
78. <setting name="logImpl" value="STDOUT_LOGGING"/>
79. </settings><package name="com.Ji.dao"/>
80. </mappers><mapper />
81. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
82. </mappers><package name="com.kuang.pojo"/>
83. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
84. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
85. </mappers><mappers>
86. <typeAliases>
87. <typeAliases>
88. <mappers>
89. <mappers>
90. <mappers>
91. <settings>
92. <setting name="logImpl" value="STDOUT_LOGGING"/>
93. </settings><package name="com.Ji.dao"/>
94. </mappers><mapper />
95. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
96. </mappers><package name="com.kuang.pojo"/>
97. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
98. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
99. </mappers><mappers>
100. <typeAliases>
101. <typeAliases>
102. <mappers>
103. <mappers>
104. <mappers>
105. <settings>
106. <setting name="logImpl" value="STDOUT_LOGGING"/>
107. </settings><package name="com.Ji.dao"/>
108. </mappers><mapper />
109. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
110. </mappers><package name="com.kuang.pojo"/>
111. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
112. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
113. </mappers><mappers>
114. <typeAliases>
115. <typeAliases>
116. <mappers>
117. <mappers>
118. <mappers>
119. <settings>
120. <setting name="logImpl" value="STDOUT_LOGGING"/>
121. </settings><package name="com.Ji.dao"/>
122. </mappers><mapper />
123. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
124. </mappers><package name="com.kuang.pojo"/>
125. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
126. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
127. </mappers><mappers>
128. <typeAliases>
129. <typeAliases>
130. <mappers>
131. <mappers>
132. <mappers>
133. <settings>
134. <setting name="logImpl" value="STDOUT_LOGGING"/>
135. </settings><package name="com.Ji.dao"/>
136. </mappers><mapper />
137. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
138. </mappers><package name="com.kuang.pojo"/>
139. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
140. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
141. </mappers>select * from USER where id = #{id}<mappers>
142. <typeAliases>
143. <typeAliases>
144. <mappers>
145. <mappers>
146. <mappers>
147. <settings>
148. <setting name="logImpl" value="STDOUT_LOGGING"/>
149. </settings><package name="com.Ji.dao"/>
150. </mappers><mapper />
151. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
152. </mappers><package name="com.kuang.pojo"/>
153. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
154. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
155. </mappers>
复制代码
如果这个世界总是这么简单就好了。

六、日志

Ⅰ日志工厂

如果一个数据库操作，出现了异常，我们需要排错，日志就是最好的助手！
曾经：sout（输出）、debug

SLF4J
LOG4J 【掌握】
LOG4J2
JDK_LOGGING
COMMONS_LOGGING
STDOUT_LOGGING 【掌握】
NO_LOGGING
在MyBatis中具体使用哪一个日志实现，在设置中设定

STDOUT_LOGGING
标准的日志工厂的实现STDOUT_LOGGING

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>

复制代码

读日志！！！
ⅡLog4j

什么是Log4j？

Log4j是Apache的一个开源项目，通过使用Log4j，我们可以控制日志信息输送的目的地是控制台、文件、GUI组件；
我们也可以控制每一条日志的输出格式；
通过定义每一条日志信息的级别，我们能够更加细致地控制日志的生成过程；
最令人感兴趣的就是，这些可以通过一个配置文件来灵活地进行配置，而不需要修改应用的代码。

先导入log4j的包
1. <mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers><mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers><mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers><mappers>
44. <typeAliases>
45. <typeAliases>
46. <mappers>
47. <mappers>
48. <mappers>
49. <settings>
50. <setting name="logImpl" value="STDOUT_LOGGING"/>
51. </settings><package name="com.Ji.dao"/>
52. </mappers><mapper />
53. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
54. </mappers><package name="com.kuang.pojo"/>
55. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
56. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
57. </mappers><mappers>
58. <typeAliases>
59. <typeAliases>
60. <mappers>
61. <mappers>
62. <mappers>
63. <settings>
64. <setting name="logImpl" value="STDOUT_LOGGING"/>
65. </settings><package name="com.Ji.dao"/>
66. </mappers><mapper />
67. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
68. </mappers><package name="com.kuang.pojo"/>
69. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
70. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
71. </mappers>
复制代码
1. <mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers>log4j<mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers>log4j<mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers>1.2.17
复制代码
log4j.properties
1. #将等级为DEBUG的日志信息输出到console和file这两个目的地，console和file的定义在下面的代码
2. log4j.rootLogger=DEBUG,console,file
4. #控制台输出的相关设置
5. log4j.appender.console = org.apache.log4j.ConsoleAppender
6. log4j.appender.console.Target = System.out
7. log4j.appender.console.Threshold=DEBUG
8. log4j.appender.console.layout = org.apache.log4j.PatternLayout
9. log4j.appender.console.layout.ConversionPattern=[%c]-%m%n
10. #文件输出的相关设置
11. log4j.appender.file = org.apache.log4j.RollingFileAppender
12. log4j.appender.file.File=./log/rzp.log
13. log4j.appender.file.MaxFileSize=10mb
14. log4j.appender.file.Threshold=DEBUG
15. log4j.appender.file.layout=org.apache.log4j.PatternLayout
16. log4j.appender.file.layout.ConversionPattern=[%p][%d{yy-MM-dd}][%c]%m%n
17. #日志输出级别
18. log4j.logger.org.mybatis=DEBUG
19. log4j.logger.java.sql=DEBUG
20. log4j.logger.java.sql.Statement=DEBUG
21. log4j.logger.java.sql.ResultSet=DEBUG
22. log4j.logger.java.sq1.PreparedStatement=DEBUG
复制代码
配置settings为log4j实现
1. <mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers><mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers><mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers><mappers>
44. <typeAliases>
45. <typeAliases>
46. <mappers>
47. <mappers>
48. <mappers>
49. <settings>
50. <setting name="logImpl" value="STDOUT_LOGGING"/>
51. </settings><package name="com.Ji.dao"/>
52. </mappers><mapper />
53. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
54. </mappers><package name="com.kuang.pojo"/>
55. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
56. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
57. </mappers><mappers>
58. <typeAliases>
59. <typeAliases>
60. <mappers>
61. <mappers>
62. <mappers>
63. <settings>
64. <setting name="logImpl" value="STDOUT_LOGGING"/>
65. </settings><package name="com.Ji.dao"/>
66. </mappers><mapper />
67. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
68. </mappers><package name="com.kuang.pojo"/>
69. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
70. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
71. </mappers><mappers>
72. <typeAliases>
73. <typeAliases>
74. <mappers>
75. <mappers>
76. <mappers>
77. <settings>
78. <setting name="logImpl" value="STDOUT_LOGGING"/>
79. </settings><package name="com.Ji.dao"/>
80. </mappers><mapper />
81. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
82. </mappers><package name="com.kuang.pojo"/>
83. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
84. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
85. </mappers>
复制代码
测试运行

Log4j简单使用

在要使用Log4j的类中，导入包 import org.apache.log4j.Logger;
日志对象，参数为当前类的class对象
1. Logger logger = Logger.getLogger(UserDaoTest.class);
复制代码
日志级别
1. logger.info("info: 测试log4j");
2. logger.debug("debug: 测试log4j");
3. logger.error("error:测试log4j");
复制代码

1.info
2.debug
3.erro
七、分页

思考：为什么分页？

减少数据的处理量

Ⅰ使用Limit分页（通过sql层面实现）

sql 语法：SELECT * from user limit startIndex,pageSize

复制代码

使用MyBatis实现分页，核心SQL

接口
1. //分页
2. List<User> getUserByLimit(Map<String,Integer> map);
复制代码
Mapper.xml
1. <mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers>select * from user limit #{startIndex},#{pageSize}
复制代码
测试
1. @Test<mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers>public void getUserByLimit(){<mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers><mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers>SqlSession sqlSession = MybatisUtils.getSqlSession();<mappers>
44. <typeAliases>
45. <typeAliases>
46. <mappers>
47. <mappers>
48. <mappers>
49. <settings>
50. <setting name="logImpl" value="STDOUT_LOGGING"/>
51. </settings><package name="com.Ji.dao"/>
52. </mappers><mapper />
53. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
54. </mappers><package name="com.kuang.pojo"/>
55. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
56. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
57. </mappers><mappers>
58. <typeAliases>
59. <typeAliases>
60. <mappers>
61. <mappers>
62. <mappers>
63. <settings>
64. <setting name="logImpl" value="STDOUT_LOGGING"/>
65. </settings><package name="com.Ji.dao"/>
66. </mappers><mapper />
67. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
68. </mappers><package name="com.kuang.pojo"/>
69. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
70. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
71. </mappers>UserMapper mapper = sqlSession.getMapper(UserMapper.class);<mappers>
72. <typeAliases>
73. <typeAliases>
74. <mappers>
75. <mappers>
76. <mappers>
77. <settings>
78. <setting name="logImpl" value="STDOUT_LOGGING"/>
79. </settings><package name="com.Ji.dao"/>
80. </mappers><mapper />
81. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
82. </mappers><package name="com.kuang.pojo"/>
83. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
84. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
85. </mappers><mappers>
86. <typeAliases>
87. <typeAliases>
88. <mappers>
89. <mappers>
90. <mappers>
91. <settings>
92. <setting name="logImpl" value="STDOUT_LOGGING"/>
93. </settings><package name="com.Ji.dao"/>
94. </mappers><mapper />
95. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
96. </mappers><package name="com.kuang.pojo"/>
97. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
98. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
99. </mappers>HashMap map = new HashMap();<mappers>
100. <typeAliases>
101. <typeAliases>
102. <mappers>
103. <mappers>
104. <mappers>
105. <settings>
106. <setting name="logImpl" value="STDOUT_LOGGING"/>
107. </settings><package name="com.Ji.dao"/>
108. </mappers><mapper />
109. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
110. </mappers><package name="com.kuang.pojo"/>
111. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
112. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
113. </mappers><mappers>
114. <typeAliases>
115. <typeAliases>
116. <mappers>
117. <mappers>
118. <mappers>
119. <settings>
120. <setting name="logImpl" value="STDOUT_LOGGING"/>
121. </settings><package name="com.Ji.dao"/>
122. </mappers><mapper />
123. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
124. </mappers><package name="com.kuang.pojo"/>
125. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
126. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
127. </mappers>map.put("startIndex",1);<mappers>
128. <typeAliases>
129. <typeAliases>
130. <mappers>
131. <mappers>
132. <mappers>
133. <settings>
134. <setting name="logImpl" value="STDOUT_LOGGING"/>
135. </settings><package name="com.Ji.dao"/>
136. </mappers><mapper />
137. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
138. </mappers><package name="com.kuang.pojo"/>
139. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
140. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
141. </mappers><mappers>
142. <typeAliases>
143. <typeAliases>
144. <mappers>
145. <mappers>
146. <mappers>
147. <settings>
148. <setting name="logImpl" value="STDOUT_LOGGING"/>
149. </settings><package name="com.Ji.dao"/>
150. </mappers><mapper />
151. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
152. </mappers><package name="com.kuang.pojo"/>
153. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
154. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
155. </mappers>map.put("pageSize",2);<mappers>
156. <typeAliases>
157. <typeAliases>
158. <mappers>
159. <mappers>
160. <mappers>
161. <settings>
162. <setting name="logImpl" value="STDOUT_LOGGING"/>
163. </settings><package name="com.Ji.dao"/>
164. </mappers><mapper />
165. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
166. </mappers><package name="com.kuang.pojo"/>
167. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
168. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
169. </mappers><mappers>
170. <typeAliases>
171. <typeAliases>
172. <mappers>
173. <mappers>
174. <mappers>
175. <settings>
176. <setting name="logImpl" value="STDOUT_LOGGING"/>
177. </settings><package name="com.Ji.dao"/>
178. </mappers><mapper />
179. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
180. </mappers><package name="com.kuang.pojo"/>
181. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
182. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
183. </mappers>List list = mapper.getUserByLimit(map);<mappers>
184. <typeAliases>
185. <typeAliases>
186. <mappers>
187. <mappers>
188. <mappers>
189. <settings>
190. <setting name="logImpl" value="STDOUT_LOGGING"/>
191. </settings><package name="com.Ji.dao"/>
192. </mappers><mapper />
193. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
194. </mappers><package name="com.kuang.pojo"/>
195. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
196. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
197. </mappers><mappers>
198. <typeAliases>
199. <typeAliases>
200. <mappers>
201. <mappers>
202. <mappers>
203. <settings>
204. <setting name="logImpl" value="STDOUT_LOGGING"/>
205. </settings><package name="com.Ji.dao"/>
206. </mappers><mapper />
207. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
208. </mappers><package name="com.kuang.pojo"/>
209. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
210. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
211. </mappers>for (User user : list) {<mappers>
212. <typeAliases>
213. <typeAliases>
214. <mappers>
215. <mappers>
216. <mappers>
217. <settings>
218. <setting name="logImpl" value="STDOUT_LOGGING"/>
219. </settings><package name="com.Ji.dao"/>
220. </mappers><mapper />
221. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
222. </mappers><package name="com.kuang.pojo"/>
223. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
224. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
225. </mappers><mappers>
226. <typeAliases>
227. <typeAliases>
228. <mappers>
229. <mappers>
230. <mappers>
231. <settings>
232. <setting name="logImpl" value="STDOUT_LOGGING"/>
233. </settings><package name="com.Ji.dao"/>
234. </mappers><mapper />
235. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
236. </mappers><package name="com.kuang.pojo"/>
237. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
238. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
239. </mappers><mappers>
240. <typeAliases>
241. <typeAliases>
242. <mappers>
243. <mappers>
244. <mappers>
245. <settings>
246. <setting name="logImpl" value="STDOUT_LOGGING"/>
247. </settings><package name="com.Ji.dao"/>
248. </mappers><mapper />
249. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
250. </mappers><package name="com.kuang.pojo"/>
251. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
252. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
253. </mappers>System.out.println(user);<mappers>
254. <typeAliases>
255. <typeAliases>
256. <mappers>
257. <mappers>
258. <mappers>
259. <settings>
260. <setting name="logImpl" value="STDOUT_LOGGING"/>
261. </settings><package name="com.Ji.dao"/>
262. </mappers><mapper />
263. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
264. </mappers><package name="com.kuang.pojo"/>
265. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
266. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
267. </mappers><mappers>
268. <typeAliases>
269. <typeAliases>
270. <mappers>
271. <mappers>
272. <mappers>
273. <settings>
274. <setting name="logImpl" value="STDOUT_LOGGING"/>
275. </settings><package name="com.Ji.dao"/>
276. </mappers><mapper />
277. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
278. </mappers><package name="com.kuang.pojo"/>
279. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
280. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
281. </mappers>}<mappers>
282. <typeAliases>
283. <typeAliases>
284. <mappers>
285. <mappers>
286. <mappers>
287. <settings>
288. <setting name="logImpl" value="STDOUT_LOGGING"/>
289. </settings><package name="com.Ji.dao"/>
290. </mappers><mapper />
291. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
292. </mappers><package name="com.kuang.pojo"/>
293. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
294. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
295. </mappers>}
复制代码

Ⅱ RowBounds分页（通过Java代码层面实现）

不再使用SQL实现分页

接口
1. //分页2
2. List<User> getUserByRowBounds();
复制代码
mapper.xml
1. <mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers><mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers><?xml version="1.0" encoding="UTF-8" ?>
30. <!DOCTYPE mapper
31. <mappers>
32. <typeAliases>
33. <typeAliases>
34. <mappers>
35. <mappers>
36. <mappers>
37. <settings>
38. <setting name="logImpl" value="STDOUT_LOGGING"/>
39. </settings><package name="com.Ji.dao"/>
40. </mappers><mapper />
41. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
42. </mappers><package name="com.kuang.pojo"/>
43. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
44. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
45. </mappers><mappers>
46. <typeAliases>
47. <typeAliases>
48. <mappers>
49. <mappers>
50. <mappers>
51. <settings>
52. <setting name="logImpl" value="STDOUT_LOGGING"/>
53. </settings><package name="com.Ji.dao"/>
54. </mappers><mapper />
55. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
56. </mappers><package name="com.kuang.pojo"/>
57. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
58. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
59. </mappers>PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
60. <mappers>
61. <typeAliases>
62. <typeAliases>
63. <mappers>
64. <mappers>
65. <mappers>
66. <settings>
67. <setting name="logImpl" value="STDOUT_LOGGING"/>
68. </settings><package name="com.Ji.dao"/>
69. </mappers><mapper />
70. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
71. </mappers><package name="com.kuang.pojo"/>
72. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
73. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
74. </mappers><mappers>
75. <typeAliases>
76. <typeAliases>
77. <mappers>
78. <mappers>
79. <mappers>
80. <settings>
81. <setting name="logImpl" value="STDOUT_LOGGING"/>
82. </settings><package name="com.Ji.dao"/>
83. </mappers><mapper />
84. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
85. </mappers><package name="com.kuang.pojo"/>
86. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
87. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
88. </mappers>"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
91. <mapper namespace="com.kuang.dao.UserDao">
92. <mappers>
93. <typeAliases>
94. <typeAliases>
95. <mappers>
96. <mappers>
97. <mappers>
98. <settings>
99. <setting name="logImpl" value="STDOUT_LOGGING"/>
100. </settings><package name="com.Ji.dao"/>
101. </mappers><mapper />
102. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
103. </mappers><package name="com.kuang.pojo"/>
104. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
105. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
106. </mappers><select id="getUserList" resultType="com.kuang.pojo.User">
107. <mappers>
108. <typeAliases>
109. <typeAliases>
110. <mappers>
111. <mappers>
112. <mappers>
113. <settings>
114. <setting name="logImpl" value="STDOUT_LOGGING"/>
115. </settings><package name="com.Ji.dao"/>
116. </mappers><mapper />
117. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
118. </mappers><package name="com.kuang.pojo"/>
119. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
120. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
121. </mappers>select * from USER
122. </select>
123. </mapper>
复制代码
测试
1. @Test<mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers>//分页2<mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers>public void getUserByRowBounds(){<mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers><mappers>
44. <typeAliases>
45. <typeAliases>
46. <mappers>
47. <mappers>
48. <mappers>
49. <settings>
50. <setting name="logImpl" value="STDOUT_LOGGING"/>
51. </settings><package name="com.Ji.dao"/>
52. </mappers><mapper />
53. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
54. </mappers><package name="com.kuang.pojo"/>
55. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
56. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
57. </mappers>SqlSession sqlSession = MybatisUtils.getSqlSession();<mappers>
58. <typeAliases>
59. <typeAliases>
60. <mappers>
61. <mappers>
62. <mappers>
63. <settings>
64. <setting name="logImpl" value="STDOUT_LOGGING"/>
65. </settings><package name="com.Ji.dao"/>
66. </mappers><mapper />
67. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
68. </mappers><package name="com.kuang.pojo"/>
69. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
70. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
71. </mappers><mappers>
72. <typeAliases>
73. <typeAliases>
74. <mappers>
75. <mappers>
76. <mappers>
77. <settings>
78. <setting name="logImpl" value="STDOUT_LOGGING"/>
79. </settings><package name="com.Ji.dao"/>
80. </mappers><mapper />
81. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
82. </mappers><package name="com.kuang.pojo"/>
83. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
84. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
85. </mappers>//RowBounds实现<mappers>
86. <typeAliases>
87. <typeAliases>
88. <mappers>
89. <mappers>
90. <mappers>
91. <settings>
92. <setting name="logImpl" value="STDOUT_LOGGING"/>
93. </settings><package name="com.Ji.dao"/>
94. </mappers><mapper />
95. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
96. </mappers><package name="com.kuang.pojo"/>
97. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
98. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
99. </mappers><mappers>
100. <typeAliases>
101. <typeAliases>
102. <mappers>
103. <mappers>
104. <mappers>
105. <settings>
106. <setting name="logImpl" value="STDOUT_LOGGING"/>
107. </settings><package name="com.Ji.dao"/>
108. </mappers><mapper />
109. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
110. </mappers><package name="com.kuang.pojo"/>
111. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
112. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
113. </mappers>RowBounds rowBounds = new RowBounds(1, 2);<mappers>
114. <typeAliases>
115. <typeAliases>
116. <mappers>
117. <mappers>
118. <mappers>
119. <settings>
120. <setting name="logImpl" value="STDOUT_LOGGING"/>
121. </settings><package name="com.Ji.dao"/>
122. </mappers><mapper />
123. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
124. </mappers><package name="com.kuang.pojo"/>
125. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
126. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
127. </mappers><mappers>
128. <typeAliases>
129. <typeAliases>
130. <mappers>
131. <mappers>
132. <mappers>
133. <settings>
134. <setting name="logImpl" value="STDOUT_LOGGING"/>
135. </settings><package name="com.Ji.dao"/>
136. </mappers><mapper />
137. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
138. </mappers><package name="com.kuang.pojo"/>
139. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
140. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
141. </mappers>//通过Java代码层面实现分页<mappers>
142. <typeAliases>
143. <typeAliases>
144. <mappers>
145. <mappers>
146. <mappers>
147. <settings>
148. <setting name="logImpl" value="STDOUT_LOGGING"/>
149. </settings><package name="com.Ji.dao"/>
150. </mappers><mapper />
151. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
152. </mappers><package name="com.kuang.pojo"/>
153. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
154. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
155. </mappers><mappers>
156. <typeAliases>
157. <typeAliases>
158. <mappers>
159. <mappers>
160. <mappers>
161. <settings>
162. <setting name="logImpl" value="STDOUT_LOGGING"/>
163. </settings><package name="com.Ji.dao"/>
164. </mappers><mapper />
165. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
166. </mappers><package name="com.kuang.pojo"/>
167. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
168. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
169. </mappers>List userList = sqlSession.selectList("com.Ji.dao.UserMapper.getUserByRowBounds", null, rowBounds);<mappers>
170. <typeAliases>
171. <typeAliases>
172. <mappers>
173. <mappers>
174. <mappers>
175. <settings>
176. <setting name="logImpl" value="STDOUT_LOGGING"/>
177. </settings><package name="com.Ji.dao"/>
178. </mappers><mapper />
179. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
180. </mappers><package name="com.kuang.pojo"/>
181. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
182. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
183. </mappers><mappers>
184. <typeAliases>
185. <typeAliases>
186. <mappers>
187. <mappers>
188. <mappers>
189. <settings>
190. <setting name="logImpl" value="STDOUT_LOGGING"/>
191. </settings><package name="com.Ji.dao"/>
192. </mappers><mapper />
193. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
194. </mappers><package name="com.kuang.pojo"/>
195. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
196. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
197. </mappers>for (User user : userList) {<mappers>
198. <typeAliases>
199. <typeAliases>
200. <mappers>
201. <mappers>
202. <mappers>
203. <settings>
204. <setting name="logImpl" value="STDOUT_LOGGING"/>
205. </settings><package name="com.Ji.dao"/>
206. </mappers><mapper />
207. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
208. </mappers><package name="com.kuang.pojo"/>
209. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
210. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
211. </mappers><mappers>
212. <typeAliases>
213. <typeAliases>
214. <mappers>
215. <mappers>
216. <mappers>
217. <settings>
218. <setting name="logImpl" value="STDOUT_LOGGING"/>
219. </settings><package name="com.Ji.dao"/>
220. </mappers><mapper />
221. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
222. </mappers><package name="com.kuang.pojo"/>
223. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
224. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
225. </mappers><mappers>
226. <typeAliases>
227. <typeAliases>
228. <mappers>
229. <mappers>
230. <mappers>
231. <settings>
232. <setting name="logImpl" value="STDOUT_LOGGING"/>
233. </settings><package name="com.Ji.dao"/>
234. </mappers><mapper />
235. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
236. </mappers><package name="com.kuang.pojo"/>
237. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
238. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
239. </mappers>System.out.println(user);<mappers>
240. <typeAliases>
241. <typeAliases>
242. <mappers>
243. <mappers>
244. <mappers>
245. <settings>
246. <setting name="logImpl" value="STDOUT_LOGGING"/>
247. </settings><package name="com.Ji.dao"/>
248. </mappers><mapper />
249. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
250. </mappers><package name="com.kuang.pojo"/>
251. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
252. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
253. </mappers><mappers>
254. <typeAliases>
255. <typeAliases>
256. <mappers>
257. <mappers>
258. <mappers>
259. <settings>
260. <setting name="logImpl" value="STDOUT_LOGGING"/>
261. </settings><package name="com.Ji.dao"/>
262. </mappers><mapper />
263. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
264. </mappers><package name="com.kuang.pojo"/>
265. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
266. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
267. </mappers>}<mappers>
268. <typeAliases>
269. <typeAliases>
270. <mappers>
271. <mappers>
272. <mappers>
273. <settings>
274. <setting name="logImpl" value="STDOUT_LOGGING"/>
275. </settings><package name="com.Ji.dao"/>
276. </mappers><mapper />
277. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
278. </mappers><package name="com.kuang.pojo"/>
279. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
280. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
281. </mappers><mappers>
282. <typeAliases>
283. <typeAliases>
284. <mappers>
285. <mappers>
286. <mappers>
287. <settings>
288. <setting name="logImpl" value="STDOUT_LOGGING"/>
289. </settings><package name="com.Ji.dao"/>
290. </mappers><mapper />
291. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
292. </mappers><package name="com.kuang.pojo"/>
293. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
294. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
295. </mappers>sqlSession.close();<mappers>
296. <typeAliases>
297. <typeAliases>
298. <mappers>
299. <mappers>
300. <mappers>
301. <settings>
302. <setting name="logImpl" value="STDOUT_LOGGING"/>
303. </settings><package name="com.Ji.dao"/>
304. </mappers><mapper />
305. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
306. </mappers><package name="com.kuang.pojo"/>
307. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
308. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
309. </mappers>}
复制代码

Ⅲ分页插件（通过第三方插件实现）

MyBatis 分页插件 PageHelper

注：不管使用哪种分页它的底层都是limi
八、使用注解开发

Ⅰ面向接口开发

三个面向区别

面向对象是指，我们考虑问题时，以对象为单位，考虑它的属性和方法；
面向过程是指，我们考虑问题时，以一个具体的流程（事务过程）为单位，考虑它的实现；
接口设计与非接口设计是针对复用技术而言的，与面向对象（过程）不是一个问题，更多的体现就是对系统整体的架构；

Ⅱ使用注解开发

注解在接口上实现
1. @Select("select * from user")
2. List<User> getUsers();
复制代码
需要在核心配置文件中绑定接口
1. <mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers><mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers><mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers><mappers>
44. <typeAliases>
45. <typeAliases>
46. <mappers>
47. <mappers>
48. <mappers>
49. <settings>
50. <setting name="logImpl" value="STDOUT_LOGGING"/>
51. </settings><package name="com.Ji.dao"/>
52. </mappers><mapper />
53. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
54. </mappers><package name="com.kuang.pojo"/>
55. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
56. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
57. </mappers><mappers>
58. <typeAliases>
59. <typeAliases>
60. <mappers>
61. <mappers>
62. <mappers>
63. <settings>
64. <setting name="logImpl" value="STDOUT_LOGGING"/>
65. </settings><package name="com.Ji.dao"/>
66. </mappers><mapper />
67. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
68. </mappers><package name="com.kuang.pojo"/>
69. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
70. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
71. </mappers>
复制代码
.测试
本质：反射机制实现
底层：动态代理

**Java的方式不如写resultMap方便 **

MyBatis详细执行流程

Ⅲ注解CURD

设置自动提交事物，在MybatisUtils.xml里面

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>public static SqlSession getSqlSession(){<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>return sqlSessionFactory.openSession(true);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>}

复制代码

接口：

//使用注解代替xmlpublic interface UserMapper {<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>@Select("select * from user")<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>List getUsers();<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>@Select("select * from user where id = #{id}")<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>User getUserById(@Param("id") int id);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>@Insert("insert into user(id,name,pwd) values (#{id},#{name},#{password})")<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>int addUser(User user);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>@Update("update user set name = #{name}, pwd = #{password} where id = #{id}")<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>int updateUser(User user);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>@Delete("delete from user where id = #{uid} ")<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>int deleteUser(@Param("uid") int id);}

复制代码

测试类：

public class UserMapperTest {<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>@Test<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>public void test(){<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>SqlSession sqlSession = MybatisUtils.getSqlSession();<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>UserMapper mapper = sqlSession.getMapper(UserMapper.class);//取出//<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>List users = mapper.getUsers();//<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>for (User user : users) {//<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>System.out.println(user);//<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>}//查//<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>User userById = mapper.getUserById(1);//<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>System.out.println(userById);//<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>mapper.addUser(new User(5,"hello","111"));//<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>mapper.updateUser(new User(4,"hello update","000"));//删<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers> mapper.deleteUser(5);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>sqlSession.close();<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>}}

复制代码

【注意：我们必须将接口文件注册到核心配置文件中】！！！

//方法存在多个参数，所有的参数前面必须加上@Param("id")注解，且取出的id以Param为主
@Delete("delete from user where id = ${uid}")
int deleteUser(@Param("uid") int id);

复制代码

关于@Param( )注解

基本类型的参数或者String类型，需要加上
引用类型不需要加
如果只有一个基本类型的话，可以忽略，但是建议大家都加上
我们在SQL中引用的就是我们这里的@Param()中设定的属性名
#{} 和 ${}的区别

九、Lombok

(需要偷懒的可以使用，但不建议使用！！！)

Lombok项目是一个Java库，它会自动插入编辑器和构建工具中，
Lombok提供了一组有用的注释，用来消除Java类中的大量样板代码。
仅五个字符(@Data)就可以替换数百行代码从而产生干净，简洁且易于维护的Java类。

使用步骤：

在IDEA中安装Lombok插件
新版已经内置在IDEA中

在项目中导入lombok的jar包
1. <mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers>org.projectlombok<mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers>lombok<mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers>1.18.10<mappers>
44. <typeAliases>
45. <typeAliases>
46. <mappers>
47. <mappers>
48. <mappers>
49. <settings>
50. <setting name="logImpl" value="STDOUT_LOGGING"/>
51. </settings><package name="com.Ji.dao"/>
52. </mappers><mapper />
53. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
54. </mappers><package name="com.kuang.pojo"/>
55. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
56. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
57. </mappers>provided
复制代码
在程序上加注解
1. @Getter and @Setter<mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers>@FieldNameConstants<mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers>@ToString<mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers>@EqualsAndHashCode<mappers>
44. <typeAliases>
45. <typeAliases>
46. <mappers>
47. <mappers>
48. <mappers>
49. <settings>
50. <setting name="logImpl" value="STDOUT_LOGGING"/>
51. </settings><package name="com.Ji.dao"/>
52. </mappers><mapper />
53. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
54. </mappers><package name="com.kuang.pojo"/>
55. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
56. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
57. </mappers>@AllArgsConstructor, @RequiredArgsConstructor and @NoArgsConstructor<mappers>
58. <typeAliases>
59. <typeAliases>
60. <mappers>
61. <mappers>
62. <mappers>
63. <settings>
64. <setting name="logImpl" value="STDOUT_LOGGING"/>
65. </settings><package name="com.Ji.dao"/>
66. </mappers><mapper />
67. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
68. </mappers><package name="com.kuang.pojo"/>
69. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
70. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
71. </mappers>@Log, @Log4j, @Log4j2, @Slf4j, @XSlf4j, @CommonsLog, @JBossLog, @Flogger, @CustomLog<mappers>
72. <typeAliases>
73. <typeAliases>
74. <mappers>
75. <mappers>
76. <mappers>
77. <settings>
78. <setting name="logImpl" value="STDOUT_LOGGING"/>
79. </settings><package name="com.Ji.dao"/>
80. </mappers><mapper />
81. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
82. </mappers><package name="com.kuang.pojo"/>
83. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
84. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
85. </mappers>@Data<mappers>
86. <typeAliases>
87. <typeAliases>
88. <mappers>
89. <mappers>
90. <mappers>
91. <settings>
92. <setting name="logImpl" value="STDOUT_LOGGING"/>
93. </settings><package name="com.Ji.dao"/>
94. </mappers><mapper />
95. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
96. </mappers><package name="com.kuang.pojo"/>
97. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
98. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
99. </mappers>@Builder<mappers>
100. <typeAliases>
101. <typeAliases>
102. <mappers>
103. <mappers>
104. <mappers>
105. <settings>
106. <setting name="logImpl" value="STDOUT_LOGGING"/>
107. </settings><package name="com.Ji.dao"/>
108. </mappers><mapper />
109. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
110. </mappers><package name="com.kuang.pojo"/>
111. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
112. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
113. </mappers>@SuperBuilder<mappers>
114. <typeAliases>
115. <typeAliases>
116. <mappers>
117. <mappers>
118. <mappers>
119. <settings>
120. <setting name="logImpl" value="STDOUT_LOGGING"/>
121. </settings><package name="com.Ji.dao"/>
122. </mappers><mapper />
123. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
124. </mappers><package name="com.kuang.pojo"/>
125. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
126. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
127. </mappers>@Singular<mappers>
128. <typeAliases>
129. <typeAliases>
130. <mappers>
131. <mappers>
132. <mappers>
133. <settings>
134. <setting name="logImpl" value="STDOUT_LOGGING"/>
135. </settings><package name="com.Ji.dao"/>
136. </mappers><mapper />
137. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
138. </mappers><package name="com.kuang.pojo"/>
139. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
140. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
141. </mappers>@Delegate<mappers>
142. <typeAliases>
143. <typeAliases>
144. <mappers>
145. <mappers>
146. <mappers>
147. <settings>
148. <setting name="logImpl" value="STDOUT_LOGGING"/>
149. </settings><package name="com.Ji.dao"/>
150. </mappers><mapper />
151. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
152. </mappers><package name="com.kuang.pojo"/>
153. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
154. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
155. </mappers>@Value<mappers>
156. <typeAliases>
157. <typeAliases>
158. <mappers>
159. <mappers>
160. <mappers>
161. <settings>
162. <setting name="logImpl" value="STDOUT_LOGGING"/>
163. </settings><package name="com.Ji.dao"/>
164. </mappers><mapper />
165. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
166. </mappers><package name="com.kuang.pojo"/>
167. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
168. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
169. </mappers>@Accessors<mappers>
170. <typeAliases>
171. <typeAliases>
172. <mappers>
173. <mappers>
174. <mappers>
175. <settings>
176. <setting name="logImpl" value="STDOUT_LOGGING"/>
177. </settings><package name="com.Ji.dao"/>
178. </mappers><mapper />
179. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
180. </mappers><package name="com.kuang.pojo"/>
181. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
182. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
183. </mappers>@Wither<mappers>
184. <typeAliases>
185. <typeAliases>
186. <mappers>
187. <mappers>
188. <mappers>
189. <settings>
190. <setting name="logImpl" value="STDOUT_LOGGING"/>
191. </settings><package name="com.Ji.dao"/>
192. </mappers><mapper />
193. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
194. </mappers><package name="com.kuang.pojo"/>
195. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
196. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
197. </mappers>@With<mappers>
198. <typeAliases>
199. <typeAliases>
200. <mappers>
201. <mappers>
202. <mappers>
203. <settings>
204. <setting name="logImpl" value="STDOUT_LOGGING"/>
205. </settings><package name="com.Ji.dao"/>
206. </mappers><mapper />
207. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
208. </mappers><package name="com.kuang.pojo"/>
209. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
210. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
211. </mappers>@SneakyThrows<mappers>
212. <typeAliases>
213. <typeAliases>
214. <mappers>
215. <mappers>
216. <mappers>
217. <settings>
218. <setting name="logImpl" value="STDOUT_LOGGING"/>
219. </settings><package name="com.Ji.dao"/>
220. </mappers><mapper />
221. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
222. </mappers><package name="com.kuang.pojo"/>
223. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
224. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
225. </mappers>@val
复制代码
说明：
1. @Data@AllArgsConstructor@NoArgsConstructor@ToStringpublic class User {<mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers>private int id;<mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers>private String name;<mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers>private String password ;}
复制代码

十、多对一处理

多对一：

多个学生，对应一个老师
对于学生而言，关联–-多个学生，关联一个老师【多对一】
对于老师而言，集合–-一个老师，有很多个学生【一对多】

SQL语句：

CREATE TABLE `teacher` (
`id` INT(10) NOT NULL,
`name` VARCHAR(30) DEFAULT NULL,
PRIMARY KEY (`id`)
)ENGINE = INNODB DEFAULT CHARSET=utf8
INSERT INTO teacher(`id`,`name`) VALUES (1,'秦老师');
CREATE TABLE `student` (
`id` INT(10) NOT NULL,
`name` VARCHAR(30) DEFAULT NULL,
`tid` INT(10) DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `fktid`(`tid`),
CONSTRAINT `fktid` FOREIGN KEY (`tid`) REFERENCES `teacher` (`id`)
)ENGINE = INNODB DEFAULT CHARSET=utf8
INSERT INTO `student`(`id`,`name`,`tid`) VALUES ('1','小明','1');
INSERT INTO `student`(`id`,`name`,`tid`) VALUES ('2','小红','1');
INSERT INTO `student`(`id`,`name`,`tid`) VALUES ('3','小张','1');
INSERT INTO `student`(`id`,`name`,`tid`) VALUES ('4','小李','1');
INSERT INTO `student`(`id`,`name`,`tid`) VALUES ('5','小王','1');

复制代码

多对一关系的形成：

Ⅰ 测试环境搭建

导入Lombok
新建实体类Teacher，Student
1. package com.Ji.pojo;import lombok.Data;@Datapublic class Student {<mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers>private int id;<mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers>private String name;<mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers>//学生需要关联一个老师<mappers>
44. <typeAliases>
45. <typeAliases>
46. <mappers>
47. <mappers>
48. <mappers>
49. <settings>
50. <setting name="logImpl" value="STDOUT_LOGGING"/>
51. </settings><package name="com.Ji.dao"/>
52. </mappers><mapper />
53. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
54. </mappers><package name="com.kuang.pojo"/>
55. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
56. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
57. </mappers>private Teacher teacher;}
复制代码
1. package com.Ji.pojo;import lombok.Data;@Datapublic class Teacher {<mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers>private int id;<mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers>private String name;}
复制代码
建立Mapper接口
1. public interface StudentMapper1 {
2. }
复制代码
1. package com.Ji.dao;import com.Ji.pojo.Teacher;import org.apache.ibatis.annotations.Param;import org.apache.ibatis.annotations.Select;public interface TeacherMapper {<mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers>@Select("select * from teacher where id = #{tid}") Teacher getTeacher(@Param("tid") int id);}
复制代码
建立Mapper.XML文件
1. [/code][code]
复制代码
在核心配置文件中绑定注册我们的Mapper接口或者文件！【方式很多,随心选】
1. <mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers><mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers><mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers><mappers>
44. <typeAliases>
45. <typeAliases>
46. <mappers>
47. <mappers>
48. <mappers>
49. <settings>
50. <setting name="logImpl" value="STDOUT_LOGGING"/>
51. </settings><package name="com.Ji.dao"/>
52. </mappers><mapper />
53. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
54. </mappers><package name="com.kuang.pojo"/>
55. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
56. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
57. </mappers><mappers>
58. <typeAliases>
59. <typeAliases>
60. <mappers>
61. <mappers>
62. <mappers>
63. <settings>
64. <setting name="logImpl" value="STDOUT_LOGGING"/>
65. </settings><package name="com.Ji.dao"/>
66. </mappers><mapper />
67. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
68. </mappers><package name="com.kuang.pojo"/>
69. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
70. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
71. </mappers><mappers>
72. <typeAliases>
73. <typeAliases>
74. <mappers>
75. <mappers>
76. <mappers>
77. <settings>
78. <setting name="logImpl" value="STDOUT_LOGGING"/>
79. </settings><package name="com.Ji.dao"/>
80. </mappers><mapper />
81. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
82. </mappers><package name="com.kuang.pojo"/>
83. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
84. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
85. </mappers>
复制代码
测试查询是否能够成功！
mapper标签中,xml用resource,注解要用class!!!不然会找不到

Ⅱ按照结果嵌套处理

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>select s.id sid,s.name sname,t.name tname<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>from mybatis.student s,mybatis.teacher t<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>where s.tid = t.id<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>

复制代码

Ⅲ按照查询嵌套处理

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers> select * from mybatis.student<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>select * from mybatis.teacher where id = #{id}<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>

复制代码

对象使用：association<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>property="teacher" column="tid"就是之前解决名字和字段不一致的问题，我们增加了javaType类型和select的这个属性
集合使用：collection

回顾Mysql多对一查询方式：

子查询
联表查询

十一、一对多处理

比如：一个老师拥有多个学生！
对于老师而言，就是一对多的关系！
**环境搭建 **

环境搭建，和刚才一样
实体类：
1. @Datapublic class Student {<mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers>private int id;<mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers>private String name;<mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers>private int tid;}
复制代码
1. @Datapublic class Teacher {<mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers>private int id;<mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers>private String name;<mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers>//一个老师拥有多个学生<mappers>
44. <typeAliases>
45. <typeAliases>
46. <mappers>
47. <mappers>
48. <mappers>
49. <settings>
50. <setting name="logImpl" value="STDOUT_LOGGING"/>
51. </settings><package name="com.Ji.dao"/>
52. </mappers><mapper />
53. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
54. </mappers><package name="com.kuang.pojo"/>
55. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
56. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
57. </mappers>private List students;}
复制代码

Ⅰ按照结果嵌套处理

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers> SELECT s.id sid,s.name sname,t.name tname,t.id,tid<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>from student s,teacher t<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>where s.tid = t.id and t.id = #{tid}<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>

复制代码

复杂的属性，我们需要单独处理对象：association 集合：collection
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers> javaType="" 指定属性的类型！<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers> 集合中的泛型信息，我们使用ofType获取

查询结果

Teacher(id=1, name=秦老师, students=[
Student(id=1, name=小明, tid=1),
Student(id=2, name=小红, tid=1),
Student(id=3, name=小张, tid=1),
Student(id=4, name=小李, tid=1),
Student(id=5, name=小王, tid=1)])

复制代码

Ⅱ按照查询嵌套处理

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>select * from mybatis.teacher where id = #{tid}<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>select * from mybatis.student where tid = #{tid}<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>

复制代码

Ⅲ小结

关联-association【多对一】
集合-collection【一对多】
javaType & ofType
javaType 用来指定实体类中属性的类型
ofType 用来指定映射到List或者集合中的pojo类型，泛型中的约束类型！

注意点：保证SQL的可读性，尽量保证通俗易懂

注意一对多和多对一中，属性名和字段的问题！
如果问题不好排查错误，可以使用日志，建议使用Log4j

面试高频

Mysql引擎
InnoDB底层原理
索引
索引优化

十二、动态SQL

什么是动态SQL：动态SQL就是指根据不同的条件生成不同的SQL语句
利用动态SQL这一特性可以彻底摆脱这种痛苦。

在 MyBatis 之前的版本中，需要花时间了解大量的元素。借助功能强大的基于 OGNL 的表达式，MyBatis 3 替换了之前的大部分元素，大大精简了元素种类，现在要学习的元素种类比原来的一半还要少。
if
choose (when, otherwise)
trim (where, set)
foreach

搭建环境

CREATE TABLE `blog`(
`id` VARCHAR(50) NOT NULL COMMENT '博客id',
`title` VARCHAR(100) NOT NULL COMMENT '博客标题',
`author` VARCHAR(30) NOT NULL COMMENT '博客作者',
`create_time` DATETIME NOT NULL COMMENT '创建时间',
`views` INT(30) NOT NULL COMMENT '浏览量'
)ENGINE=INNODB DEFAULT CHARSET=utf8

复制代码

创建一个基础工程

导包
编写配置文件
1. <?xml version="1.0" encoding="UTF-8" ?>
2. <!DOCTYPE configuration
3. <mappers>
4. <typeAliases>
5. <typeAliases>
6. <mappers>
7. <mappers>
8. <mappers>
9. <settings>
10. <setting name="logImpl" value="STDOUT_LOGGING"/>
11. </settings><package name="com.Ji.dao"/>
12. </mappers><mapper />
13. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
14. </mappers><package name="com.kuang.pojo"/>
15. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
16. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
17. </mappers><mappers>
18. <typeAliases>
19. <typeAliases>
20. <mappers>
21. <mappers>
22. <mappers>
23. <settings>
24. <setting name="logImpl" value="STDOUT_LOGGING"/>
25. </settings><package name="com.Ji.dao"/>
26. </mappers><mapper />
27. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
28. </mappers><package name="com.kuang.pojo"/>
29. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
30. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
31. </mappers>PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
32. <mappers>
33. <typeAliases>
34. <typeAliases>
35. <mappers>
36. <mappers>
37. <mappers>
38. <settings>
39. <setting name="logImpl" value="STDOUT_LOGGING"/>
40. </settings><package name="com.Ji.dao"/>
41. </mappers><mapper />
42. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
43. </mappers><package name="com.kuang.pojo"/>
44. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
45. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
46. </mappers><mappers>
47. <typeAliases>
48. <typeAliases>
49. <mappers>
50. <mappers>
51. <mappers>
52. <settings>
53. <setting name="logImpl" value="STDOUT_LOGGING"/>
54. </settings><package name="com.Ji.dao"/>
55. </mappers><mapper />
56. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
57. </mappers><package name="com.kuang.pojo"/>
58. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
59. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
60. </mappers>"http://mybatis.org/dtd/mybatis-3-config.dtd">
62. <configuration>
63. <mappers>
64. <typeAliases>
65. <typeAliases>
66. <mappers>
67. <mappers>
68. <mappers>
69. <settings>
70. <setting name="logImpl" value="STDOUT_LOGGING"/>
71. </settings><package name="com.Ji.dao"/>
72. </mappers><mapper />
73. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
74. </mappers><package name="com.kuang.pojo"/>
75. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
76. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
77. </mappers><environments default="development">
78. <mappers>
79. <typeAliases>
80. <typeAliases>
81. <mappers>
82. <mappers>
83. <mappers>
84. <settings>
85. <setting name="logImpl" value="STDOUT_LOGGING"/>
86. </settings><package name="com.Ji.dao"/>
87. </mappers><mapper />
88. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
89. </mappers><package name="com.kuang.pojo"/>
90. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
91. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
92. </mappers><mappers>
93. <typeAliases>
94. <typeAliases>
95. <mappers>
96. <mappers>
97. <mappers>
98. <settings>
99. <setting name="logImpl" value="STDOUT_LOGGING"/>
100. </settings><package name="com.Ji.dao"/>
101. </mappers><mapper />
102. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
103. </mappers><package name="com.kuang.pojo"/>
104. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
105. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
106. </mappers><environment id="development">
107. <mappers>
108. <typeAliases>
109. <typeAliases>
110. <mappers>
111. <mappers>
112. <mappers>
113. <settings>
114. <setting name="logImpl" value="STDOUT_LOGGING"/>
115. </settings><package name="com.Ji.dao"/>
116. </mappers><mapper />
117. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
118. </mappers><package name="com.kuang.pojo"/>
119. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
120. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
121. </mappers><mappers>
122. <typeAliases>
123. <typeAliases>
124. <mappers>
125. <mappers>
126. <mappers>
127. <settings>
128. <setting name="logImpl" value="STDOUT_LOGGING"/>
129. </settings><package name="com.Ji.dao"/>
130. </mappers><mapper />
131. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
132. </mappers><package name="com.kuang.pojo"/>
133. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
134. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
135. </mappers><mappers>
136. <typeAliases>
137. <typeAliases>
138. <mappers>
139. <mappers>
140. <mappers>
141. <settings>
142. <setting name="logImpl" value="STDOUT_LOGGING"/>
143. </settings><package name="com.Ji.dao"/>
144. </mappers><mapper />
145. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
146. </mappers><package name="com.kuang.pojo"/>
147. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
148. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
149. </mappers><transactionManager type="JDBC"/>
150. <mappers>
151. <typeAliases>
152. <typeAliases>
153. <mappers>
154. <mappers>
155. <mappers>
156. <settings>
157. <setting name="logImpl" value="STDOUT_LOGGING"/>
158. </settings><package name="com.Ji.dao"/>
159. </mappers><mapper />
160. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
161. </mappers><package name="com.kuang.pojo"/>
162. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
163. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
164. </mappers><mappers>
165. <typeAliases>
166. <typeAliases>
167. <mappers>
168. <mappers>
169. <mappers>
170. <settings>
171. <setting name="logImpl" value="STDOUT_LOGGING"/>
172. </settings><package name="com.Ji.dao"/>
173. </mappers><mapper />
174. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
175. </mappers><package name="com.kuang.pojo"/>
176. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
177. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
178. </mappers><mappers>
179. <typeAliases>
180. <typeAliases>
181. <mappers>
182. <mappers>
183. <mappers>
184. <settings>
185. <setting name="logImpl" value="STDOUT_LOGGING"/>
186. </settings><package name="com.Ji.dao"/>
187. </mappers><mapper />
188. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
189. </mappers><package name="com.kuang.pojo"/>
190. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
191. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
192. </mappers><dataSource type="POOLED">
193. <mappers>
194. <typeAliases>
195. <typeAliases>
196. <mappers>
197. <mappers>
198. <mappers>
199. <settings>
200. <setting name="logImpl" value="STDOUT_LOGGING"/>
201. </settings><package name="com.Ji.dao"/>
202. </mappers><mapper />
203. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
204. </mappers><package name="com.kuang.pojo"/>
205. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
206. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
207. </mappers><mappers>
208. <typeAliases>
209. <typeAliases>
210. <mappers>
211. <mappers>
212. <mappers>
213. <settings>
214. <setting name="logImpl" value="STDOUT_LOGGING"/>
215. </settings><package name="com.Ji.dao"/>
216. </mappers><mapper />
217. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
218. </mappers><package name="com.kuang.pojo"/>
219. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
220. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
221. </mappers><mappers>
222. <typeAliases>
223. <typeAliases>
224. <mappers>
225. <mappers>
226. <mappers>
227. <settings>
228. <setting name="logImpl" value="STDOUT_LOGGING"/>
229. </settings><package name="com.Ji.dao"/>
230. </mappers><mapper />
231. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
232. </mappers><package name="com.kuang.pojo"/>
233. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
234. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
235. </mappers><mappers>
236. <typeAliases>
237. <typeAliases>
238. <mappers>
239. <mappers>
240. <mappers>
241. <settings>
242. <setting name="logImpl" value="STDOUT_LOGGING"/>
243. </settings><package name="com.Ji.dao"/>
244. </mappers><mapper />
245. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
246. </mappers><package name="com.kuang.pojo"/>
247. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
248. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
249. </mappers><property name="driver" value="com.mysql.jdbc.Driver"/>
250. <mappers>
251. <typeAliases>
252. <typeAliases>
253. <mappers>
254. <mappers>
255. <mappers>
256. <settings>
257. <setting name="logImpl" value="STDOUT_LOGGING"/>
258. </settings><package name="com.Ji.dao"/>
259. </mappers><mapper />
260. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
261. </mappers><package name="com.kuang.pojo"/>
262. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
263. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
264. </mappers><mappers>
265. <typeAliases>
266. <typeAliases>
267. <mappers>
268. <mappers>
269. <mappers>
270. <settings>
271. <setting name="logImpl" value="STDOUT_LOGGING"/>
272. </settings><package name="com.Ji.dao"/>
273. </mappers><mapper />
274. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
275. </mappers><package name="com.kuang.pojo"/>
276. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
277. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
278. </mappers><mappers>
279. <typeAliases>
280. <typeAliases>
281. <mappers>
282. <mappers>
283. <mappers>
284. <settings>
285. <setting name="logImpl" value="STDOUT_LOGGING"/>
286. </settings><package name="com.Ji.dao"/>
287. </mappers><mapper />
288. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
289. </mappers><package name="com.kuang.pojo"/>
290. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
291. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
292. </mappers><mappers>
293. <typeAliases>
294. <typeAliases>
295. <mappers>
296. <mappers>
297. <mappers>
298. <settings>
299. <setting name="logImpl" value="STDOUT_LOGGING"/>
300. </settings><package name="com.Ji.dao"/>
301. </mappers><mapper />
302. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
303. </mappers><package name="com.kuang.pojo"/>
304. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
305. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
306. </mappers><property name="url" value="jdbc:mysql://localhost:3306/mybatis?userSSL=true&useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC"/>
307. <mappers>
308. <typeAliases>
309. <typeAliases>
310. <mappers>
311. <mappers>
312. <mappers>
313. <settings>
314. <setting name="logImpl" value="STDOUT_LOGGING"/>
315. </settings><package name="com.Ji.dao"/>
316. </mappers><mapper />
317. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
318. </mappers><package name="com.kuang.pojo"/>
319. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
320. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
321. </mappers><mappers>
322. <typeAliases>
323. <typeAliases>
324. <mappers>
325. <mappers>
326. <mappers>
327. <settings>
328. <setting name="logImpl" value="STDOUT_LOGGING"/>
329. </settings><package name="com.Ji.dao"/>
330. </mappers><mapper />
331. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
332. </mappers><package name="com.kuang.pojo"/>
333. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
334. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
335. </mappers><mappers>
336. <typeAliases>
337. <typeAliases>
338. <mappers>
339. <mappers>
340. <mappers>
341. <settings>
342. <setting name="logImpl" value="STDOUT_LOGGING"/>
343. </settings><package name="com.Ji.dao"/>
344. </mappers><mapper />
345. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
346. </mappers><package name="com.kuang.pojo"/>
347. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
348. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
349. </mappers><mappers>
350. <typeAliases>
351. <typeAliases>
352. <mappers>
353. <mappers>
354. <mappers>
355. <settings>
356. <setting name="logImpl" value="STDOUT_LOGGING"/>
357. </settings><package name="com.Ji.dao"/>
358. </mappers><mapper />
359. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
360. </mappers><package name="com.kuang.pojo"/>
361. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
362. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
363. </mappers><property name="username" value="root"/>
364. <mappers>
365. <typeAliases>
366. <typeAliases>
367. <mappers>
368. <mappers>
369. <mappers>
370. <settings>
371. <setting name="logImpl" value="STDOUT_LOGGING"/>
372. </settings><package name="com.Ji.dao"/>
373. </mappers><mapper />
374. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
375. </mappers><package name="com.kuang.pojo"/>
376. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
377. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
378. </mappers><mappers>
379. <typeAliases>
380. <typeAliases>
381. <mappers>
382. <mappers>
383. <mappers>
384. <settings>
385. <setting name="logImpl" value="STDOUT_LOGGING"/>
386. </settings><package name="com.Ji.dao"/>
387. </mappers><mapper />
388. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
389. </mappers><package name="com.kuang.pojo"/>
390. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
391. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
392. </mappers><mappers>
393. <typeAliases>
394. <typeAliases>
395. <mappers>
396. <mappers>
397. <mappers>
398. <settings>
399. <setting name="logImpl" value="STDOUT_LOGGING"/>
400. </settings><package name="com.Ji.dao"/>
401. </mappers><mapper />
402. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
403. </mappers><package name="com.kuang.pojo"/>
404. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
405. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
406. </mappers><mappers>
407. <typeAliases>
408. <typeAliases>
409. <mappers>
410. <mappers>
411. <mappers>
412. <settings>
413. <setting name="logImpl" value="STDOUT_LOGGING"/>
414. </settings><package name="com.Ji.dao"/>
415. </mappers><mapper />
416. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
417. </mappers><package name="com.kuang.pojo"/>
418. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
419. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
420. </mappers><property name="password" value="123456"/>
421. <mappers>
422. <typeAliases>
423. <typeAliases>
424. <mappers>
425. <mappers>
426. <mappers>
427. <settings>
428. <setting name="logImpl" value="STDOUT_LOGGING"/>
429. </settings><package name="com.Ji.dao"/>
430. </mappers><mapper />
431. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
432. </mappers><package name="com.kuang.pojo"/>
433. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
434. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
435. </mappers><mappers>
436. <typeAliases>
437. <typeAliases>
438. <mappers>
439. <mappers>
440. <mappers>
441. <settings>
442. <setting name="logImpl" value="STDOUT_LOGGING"/>
443. </settings><package name="com.Ji.dao"/>
444. </mappers><mapper />
445. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
446. </mappers><package name="com.kuang.pojo"/>
447. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
448. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
449. </mappers><mappers>
450. <typeAliases>
451. <typeAliases>
452. <mappers>
453. <mappers>
454. <mappers>
455. <settings>
456. <setting name="logImpl" value="STDOUT_LOGGING"/>
457. </settings><package name="com.Ji.dao"/>
458. </mappers><mapper />
459. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
460. </mappers><package name="com.kuang.pojo"/>
461. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
462. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
463. </mappers></dataSource>
464. <mappers>
465. <typeAliases>
466. <typeAliases>
467. <mappers>
468. <mappers>
469. <mappers>
470. <settings>
471. <setting name="logImpl" value="STDOUT_LOGGING"/>
472. </settings><package name="com.Ji.dao"/>
473. </mappers><mapper />
474. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
475. </mappers><package name="com.kuang.pojo"/>
476. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
477. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
478. </mappers><mappers>
479. <typeAliases>
480. <typeAliases>
481. <mappers>
482. <mappers>
483. <mappers>
484. <settings>
485. <setting name="logImpl" value="STDOUT_LOGGING"/>
486. </settings><package name="com.Ji.dao"/>
487. </mappers><mapper />
488. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
489. </mappers><package name="com.kuang.pojo"/>
490. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
491. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
492. </mappers></environment>
493. <mappers>
494. <typeAliases>
495. <typeAliases>
496. <mappers>
497. <mappers>
498. <mappers>
499. <settings>
500. <setting name="logImpl" value="STDOUT_LOGGING"/>
501. </settings><package name="com.Ji.dao"/>
502. </mappers><mapper />
503. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
504. </mappers><package name="com.kuang.pojo"/>
505. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
506. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
507. </mappers></environments>
508. </configuration><mappers>
509. <typeAliases>
510. <typeAliases>
511. <mappers>
512. <mappers>
513. <mappers>
514. <settings>
515. <setting name="logImpl" value="STDOUT_LOGGING"/>
516. </settings><package name="com.Ji.dao"/>
517. </mappers><mapper />
518. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
519. </mappers><package name="com.kuang.pojo"/>
520. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
521. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
522. </mappers><mappers>
523. <typeAliases>
524. <typeAliases>
525. <mappers>
526. <mappers>
527. <mappers>
528. <settings>
529. <setting name="logImpl" value="STDOUT_LOGGING"/>
530. </settings><package name="com.Ji.dao"/>
531. </mappers><mapper />
532. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
533. </mappers><package name="com.kuang.pojo"/>
534. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
535. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
536. </mappers><mappers>
537. <typeAliases>
538. <typeAliases>
539. <mappers>
540. <mappers>
541. <mappers>
542. <settings>
543. <setting name="logImpl" value="STDOUT_LOGGING"/>
544. </settings><package name="com.Ji.dao"/>
545. </mappers><mapper />
546. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
547. </mappers><package name="com.kuang.pojo"/>
548. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
549. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
550. </mappers><mappers>
551. <typeAliases>
552. <typeAliases>
553. <mappers>
554. <mappers>
555. <mappers>
556. <settings>
557. <setting name="logImpl" value="STDOUT_LOGGING"/>
558. </settings><package name="com.Ji.dao"/>
559. </mappers><mapper />
560. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
561. </mappers><package name="com.kuang.pojo"/>
562. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
563. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
564. </mappers><mappers>
565. <typeAliases>
566. <typeAliases>
567. <mappers>
568. <mappers>
569. <mappers>
570. <settings>
571. <setting name="logImpl" value="STDOUT_LOGGING"/>
572. </settings><package name="com.Ji.dao"/>
573. </mappers><mapper />
574. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
575. </mappers><package name="com.kuang.pojo"/>
576. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
577. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
578. </mappers><mappers>
579. <typeAliases>
580. <typeAliases>
581. <mappers>
582. <mappers>
583. <mappers>
584. <settings>
585. <setting name="logImpl" value="STDOUT_LOGGING"/>
586. </settings><package name="com.Ji.dao"/>
587. </mappers><mapper />
588. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
589. </mappers><package name="com.kuang.pojo"/>
590. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
591. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
592. </mappers><mappers>
593. <typeAliases>
594. <typeAliases>
595. <mappers>
596. <mappers>
597. <mappers>
598. <settings>
599. <setting name="logImpl" value="STDOUT_LOGGING"/>
600. </settings><package name="com.Ji.dao"/>
601. </mappers><mapper />
602. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
603. </mappers><package name="com.kuang.pojo"/>
604. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
605. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
606. </mappers><mappers>
607. <typeAliases>
608. <typeAliases>
609. <mappers>
610. <mappers>
611. <mappers>
612. <settings>
613. <setting name="logImpl" value="STDOUT_LOGGING"/>
614. </settings><package name="com.Ji.dao"/>
615. </mappers><mapper />
616. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
617. </mappers><package name="com.kuang.pojo"/>
618. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
619. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
620. </mappers><mappers>
621. <typeAliases>
622. <typeAliases>
623. <mappers>
624. <mappers>
625. <mappers>
626. <settings>
627. <setting name="logImpl" value="STDOUT_LOGGING"/>
628. </settings><package name="com.Ji.dao"/>
629. </mappers><mapper />
630. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
631. </mappers><package name="com.kuang.pojo"/>
632. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
633. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
634. </mappers><mappers>
635. <typeAliases>
636. <typeAliases>
637. <mappers>
638. <mappers>
639. <mappers>
640. <settings>
641. <setting name="logImpl" value="STDOUT_LOGGING"/>
642. </settings><package name="com.Ji.dao"/>
643. </mappers><mapper />
644. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
645. </mappers><package name="com.kuang.pojo"/>
646. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
647. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
648. </mappers><mappers>
649. <typeAliases>
650. <typeAliases>
651. <mappers>
652. <mappers>
653. <mappers>
654. <settings>
655. <setting name="logImpl" value="STDOUT_LOGGING"/>
656. </settings><package name="com.Ji.dao"/>
657. </mappers><mapper />
658. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
659. </mappers><package name="com.kuang.pojo"/>
660. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
661. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
662. </mappers><mappers>
663. <typeAliases>
664. <typeAliases>
665. <mappers>
666. <mappers>
667. <mappers>
668. <settings>
669. <setting name="logImpl" value="STDOUT_LOGGING"/>
670. </settings><package name="com.Ji.dao"/>
671. </mappers><mapper />
672. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
673. </mappers><package name="com.kuang.pojo"/>
674. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
675. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
676. </mappers><mappers>
677. <typeAliases>
678. <typeAliases>
679. <mappers>
680. <mappers>
681. <mappers>
682. <settings>
683. <setting name="logImpl" value="STDOUT_LOGGING"/>
684. </settings><package name="com.Ji.dao"/>
685. </mappers><mapper />
686. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
687. </mappers><package name="com.kuang.pojo"/>
688. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
689. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
690. </mappers><mappers>
691. <typeAliases>
692. <typeAliases>
693. <mappers>
694. <mappers>
695. <mappers>
696. <settings>
697. <setting name="logImpl" value="STDOUT_LOGGING"/>
698. </settings><package name="com.Ji.dao"/>
699. </mappers><mapper />
700. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
701. </mappers><package name="com.kuang.pojo"/>
702. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
703. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
704. </mappers><mappers>
705. <typeAliases>
706. <typeAliases>
707. <mappers>
708. <mappers>
709. <mappers>
710. <settings>
711. <setting name="logImpl" value="STDOUT_LOGGING"/>
712. </settings><package name="com.Ji.dao"/>
713. </mappers><mapper />
714. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
715. </mappers><package name="com.kuang.pojo"/>
716. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
717. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
718. </mappers>
复制代码
编写实体类

@Data public class Blog {<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers> private String id;<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers> private String title;<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers> private String author;<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers> private Date createTime; //属性名和字段名不一致<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers> private int views; }

复制代码

编写实体类对应Mapper接口和Mapper.XML文件

接口：

public interface BlogMapper {<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>//插入数据<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>int addBlog(Blog blog);}

复制代码

xml

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>insert into mybatis.blog (id,title,author,create_time,views)<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>values(#{id},#{title},#{author},#{createTime},#{views});<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>

复制代码

ⅠIF

编写接口：

public interface BlogMapper {<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>//插入数据<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>int addBlog(Blog blog);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>//查询博客<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>List queryBlogIF(Map map);}

复制代码

xml：
为了方便拼接的，习惯性拼接1=1，这样后面添加的都可以用 and 连接省去后期需要去掉第一个and

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>select * from mybatis.blog where 1=1<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>and title = #{title}<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>and author = #{author}<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>

复制代码

测试：（在map.put中输入的是数据库的列名和需要查询的名字）

@Test<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>public void queryBlogIF(){<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>SqlSession sqlSession = MybatisUtils.getSqlSession();<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>BlogMapper mapper = sqlSession.getMapper(BlogMapper.class);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>HashMap map = new HashMap();//<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>map.put("title","Mybatis");<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>map.put("author","Kuang shen");<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>List blogs = mapper.queryBlogIF(map);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>for (Blog blog:blogs){<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>System.out.println(blog);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>}<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>sqlSession.close();<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>}

复制代码

Ⅱ choose (when, otherwise)

choose的作用就是有id我就查ID，有title我就查title
并且when标签中第一个不需要加and，之后的得加and，意思就是如果第一个不成立那么第二个再继续成立
接口：

public interface BlogMapper {<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>//插入数据<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>int addBlog(Blog blog);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>//查询博客<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>List queryBlogIF(Map map);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>List queryBlogChoose(Map map);}

复制代码

xml：

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>select * from mybatis.blog<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>title = #{title}<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>and author = #{author}<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>and views = #{views}<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>

复制代码

测试类：

@Test<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>public void queryBlogIF(){<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>SqlSession sqlSession = MybatisUtils.getSqlSession();<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>BlogMapper mapper = sqlSession.getMapper(BlogMapper.class);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>HashMap map = new HashMap();//<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>map.put("title","Mybatis");//<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>map.put("author","Kuang shen");<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>map.put("title","Java");<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>map.put("views","9999");<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>List blogs = mapper.queryBlogChoose(map);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>for (Blog blog:blogs){<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>System.out.println(blog);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>}<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>sqlSession.close();<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>}

复制代码

Ⅲ trim (where, set)

Where标签

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>select * from mybatis.blog<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>and title = #{title}<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>and author = #{author}<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>

复制代码

where标签对1=1的优化：（即采用where标签取消对where sql 语句的书写）

之前的代码<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers> select * from mybatis.blog where 1=1<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>and title = #{title}<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>and author = #{author}<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>

复制代码

采用如上的代码运行结果为：

我们在测试中的代码没有写map.put("title","Mybatis");

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>@Test<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>public void queryBlogIF(){<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>SqlSession sqlSession = MybatisUtils.getSqlSession();<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>BlogMapper mapper = sqlSession.getMapper(BlogMapper.class);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>HashMap map = new HashMap();//<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>map.put("title","Mybatis");<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>map.put("author","Kuang shen");<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>List blogs = mapper.queryBlogIF(map);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>for (Blog blog:blogs){<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>System.out.println(blog);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>}<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>sqlSession.close();<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>}

复制代码

当我们写了map.put("title","Mybatis");

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>@Test<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>public void queryBlogIF(){<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>SqlSession sqlSession = MybatisUtils.getSqlSession();<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>BlogMapper mapper = sqlSession.getMapper(BlogMapper.class);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>HashMap map = new HashMap();<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>map.put("title","Mybatis");<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>map.put("author","Kuang shen");<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>List blogs = mapper.queryBlogIF(map);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>for (Blog blog:blogs){<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>System.out.println(blog);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>}<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>sqlSession.close();<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>}

复制代码

查询结果如下：

Set标签
明确两个作用：

set语句里面如果能执行成功，那就走里面的功能
如果存在逗号，那么set方法会自动地去除

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>update mybatis.blog<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>title = #{title},<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>author = #{author}<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>where id = #{id}<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>

复制代码

父标签：trim

所谓的动态SQL，本质还是SQL语句，只是我们可以在SQL层面，去执行一个逻辑代码
Ⅳ Foreach

动态 SQL 的另一个常见使用场景是对集合进行遍历（尤其是在构建 IN 条件语句的时候）。
foreach 元素的功能非常强大，它允许你指定一个集合，声明可以在元素体内使用的集合项（item）和索引（index）变量。它也允许你指定开头与结尾的字符串以及集合项迭代之间的分隔符。这个元素也不会错误地添加多余的分隔符，看它多智能！
提示你可以将任何可迭代对象（如 List、Set 等）、Map 对象或者数组对象作为集合参数传递给 foreach。当使用可迭代对象或者数组时，index 是当前迭代的序号，item 的值是本次迭代获取到的元素。当使用 Map 对象（或者 Map.Entry 对象的集合）时，index 是键，item 是值。

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers> select * from mybatis.blog<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>id = #{id}<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>

复制代码

动态SQL就是在拼接SQL语句，我们只要保证SQL的正确性，按照SQL的格式，去排列组合就可以了。
建议：

先在Mysql中写出完整的SQL，再对应的去修改成我们的动态SQL实现通用即可！
查询结果如下：id被拼接成了or了

Ⅴ SQL片段

有的时候，我们可以能会将一些功能的部分抽取出来，方便复用！
sql标签类似于将sql公共部分进行分类化，然后再我们需要用的这段代码中引入它们

使用SQL标签抽取公共的部分
1. <mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers><mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers><mappers>
30. <typeAliases>
31. <typeAliases>
32. <mappers>
33. <mappers>
34. <mappers>
35. <settings>
36. <setting name="logImpl" value="STDOUT_LOGGING"/>
37. </settings><package name="com.Ji.dao"/>
38. </mappers><mapper />
39. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
40. </mappers><package name="com.kuang.pojo"/>
41. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
42. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
43. </mappers><mappers>
44. <typeAliases>
45. <typeAliases>
46. <mappers>
47. <mappers>
48. <mappers>
49. <settings>
50. <setting name="logImpl" value="STDOUT_LOGGING"/>
51. </settings><package name="com.Ji.dao"/>
52. </mappers><mapper />
53. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
54. </mappers><package name="com.kuang.pojo"/>
55. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
56. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
57. </mappers><mappers>
58. <typeAliases>
59. <typeAliases>
60. <mappers>
61. <mappers>
62. <mappers>
63. <settings>
64. <setting name="logImpl" value="STDOUT_LOGGING"/>
65. </settings><package name="com.Ji.dao"/>
66. </mappers><mapper />
67. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
68. </mappers><package name="com.kuang.pojo"/>
69. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
70. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
71. </mappers>title = #{title}<mappers>
72. <typeAliases>
73. <typeAliases>
74. <mappers>
75. <mappers>
76. <mappers>
77. <settings>
78. <setting name="logImpl" value="STDOUT_LOGGING"/>
79. </settings><package name="com.Ji.dao"/>
80. </mappers><mapper />
81. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
82. </mappers><package name="com.kuang.pojo"/>
83. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
84. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
85. </mappers><mappers>
86. <typeAliases>
87. <typeAliases>
88. <mappers>
89. <mappers>
90. <mappers>
91. <settings>
92. <setting name="logImpl" value="STDOUT_LOGGING"/>
93. </settings><package name="com.Ji.dao"/>
94. </mappers><mapper />
95. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
96. </mappers><package name="com.kuang.pojo"/>
97. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
98. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
99. </mappers><mappers>
100. <typeAliases>
101. <typeAliases>
102. <mappers>
103. <mappers>
104. <mappers>
105. <settings>
106. <setting name="logImpl" value="STDOUT_LOGGING"/>
107. </settings><package name="com.Ji.dao"/>
108. </mappers><mapper />
109. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
110. </mappers><package name="com.kuang.pojo"/>
111. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
112. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
113. </mappers><mappers>
114. <typeAliases>
115. <typeAliases>
116. <mappers>
117. <mappers>
118. <mappers>
119. <settings>
120. <setting name="logImpl" value="STDOUT_LOGGING"/>
121. </settings><package name="com.Ji.dao"/>
122. </mappers><mapper />
123. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
124. </mappers><package name="com.kuang.pojo"/>
125. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
126. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
127. </mappers><mappers>
128. <typeAliases>
129. <typeAliases>
130. <mappers>
131. <mappers>
132. <mappers>
133. <settings>
134. <setting name="logImpl" value="STDOUT_LOGGING"/>
135. </settings><package name="com.Ji.dao"/>
136. </mappers><mapper />
137. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
138. </mappers><package name="com.kuang.pojo"/>
139. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
140. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
141. </mappers><mappers>
142. <typeAliases>
143. <typeAliases>
144. <mappers>
145. <mappers>
146. <mappers>
147. <settings>
148. <setting name="logImpl" value="STDOUT_LOGGING"/>
149. </settings><package name="com.Ji.dao"/>
150. </mappers><mapper />
151. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
152. </mappers><package name="com.kuang.pojo"/>
153. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
154. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
155. </mappers><mappers>
156. <typeAliases>
157. <typeAliases>
158. <mappers>
159. <mappers>
160. <mappers>
161. <settings>
162. <setting name="logImpl" value="STDOUT_LOGGING"/>
163. </settings><package name="com.Ji.dao"/>
164. </mappers><mapper />
165. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
166. </mappers><package name="com.kuang.pojo"/>
167. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
168. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
169. </mappers>and author = #{author}<mappers>
170. <typeAliases>
171. <typeAliases>
172. <mappers>
173. <mappers>
174. <mappers>
175. <settings>
176. <setting name="logImpl" value="STDOUT_LOGGING"/>
177. </settings><package name="com.Ji.dao"/>
178. </mappers><mapper />
179. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
180. </mappers><package name="com.kuang.pojo"/>
181. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
182. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
183. </mappers><mappers>
184. <typeAliases>
185. <typeAliases>
186. <mappers>
187. <mappers>
188. <mappers>
189. <settings>
190. <setting name="logImpl" value="STDOUT_LOGGING"/>
191. </settings><package name="com.Ji.dao"/>
192. </mappers><mapper />
193. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
194. </mappers><package name="com.kuang.pojo"/>
195. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
196. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
197. </mappers><mappers>
198. <typeAliases>
199. <typeAliases>
200. <mappers>
201. <mappers>
202. <mappers>
203. <settings>
204. <setting name="logImpl" value="STDOUT_LOGGING"/>
205. </settings><package name="com.Ji.dao"/>
206. </mappers><mapper />
207. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
208. </mappers><package name="com.kuang.pojo"/>
209. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
210. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
211. </mappers>
复制代码
在需要使用的地方使用Include标签引用即可

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers> select * from mybatis.blog<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>

复制代码

注意事项：

最好基于单表来定义SQL片段！
不要存在where标签

十三、缓存

Ⅰ简介

什么是缓存 [ Cache ] ？

存在内存中的临时数据。
将用户经常查询的数据放在缓存（内存）中，用户去查询数据就不用从磁盘上（关系型数据库查询文件）查询，从缓存中查询，从而提高查询效率，解决了高并发系统的性能问题。

为什么使用缓存？
减少和数据库的交互次数，减少系统开销，提高系统效率。
什么样的数据能使用缓存？
经常查询并且不经常改变的数据。【可以使用缓存】
经常查询且不经常改变的数据<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>【不可以使用缓存】

ⅡMybatis缓存

Mybatis包含一个非常强大的查询缓存特性，它可以非常方便地定制和配置缓存。缓存可以极大的提升查询效率。
Mybatis系统中默认定义了两级缓存：一级缓存和二级缓存
- 默认情况下，只有一级缓存开启。（SqlSession级别的缓存，也称为本地缓存）
- 二级缓存需要手动开启和配置，它是基于namespace级别的缓存。
- 为了提高扩展性，Mybatis定义了缓存接口Cache，我们可以通过实现Cache接口来自定义二级缓存。

Ⅲ一级缓存

一级缓存也叫本地缓存：
- 与数据库同一次会话期间查询到的数据会放在本地缓存中。
- 以后如果需要获取相同的数据，直接从缓存中拿，没必要再去查询数据库

测试步骤：

开启日志！
测试在一个Session中查询两次相同记录
查看日志输出

代码：
实体类：

package com.Ji.pojo;import lombok.Data;@Datapublic class User {<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>private int id;<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>private String name;<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>private String pwd;}

复制代码

接口：

import com.Ji.pojo.User;import org.apache.ibatis.annotations.Param;public interface UserMapper {<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>//查询用户<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>User queryUserById(@Param("id") int id);}

复制代码

xml：

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>select * from user where id = #{id}<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>

复制代码

测试类：

import com.Ji.dao.UserMapper;import com.Ji.pojo.User;import com.Ji.utils.MybatisUtils;import org.apache.ibatis.session.SqlSession;import org.junit.Test;public class MyTest {<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>@Test<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>public void test(){<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>SqlSession sqlSession = MybatisUtils.getSqlSession();<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>UserMapper mapper = sqlSession.getMapper(UserMapper.class);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>User user1 = mapper.queryUserById(1);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>System.out.println(user1);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>System.out.println("================分割线====================");<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>User user2 = mapper.queryUserById(1);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>System.out.println(user2);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>System.out.println(user1 == user2 );<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>sqlSession.close();<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>}}

复制代码

缓存失效的情况：

查询不同的东西；
增删改操作，可能会改变原来的数据，所以必定会刷新缓存！没有更新的也会执行一起sql语句
查询不同的Mapper.xml
手动清理缓存！
1. sqlSession.clearCache();
复制代码

小结：一级缓存默认是开启的，只在一次SqlSession中有效，也就是拿到连接到关闭连接这个区间段！
一级缓存相当于一个Map。
Ⅳ二级缓存

二级缓存也叫全局缓存，一级缓存作用域太低了，所以诞生了二级缓存；
基于namespace级别的缓存，一个名称空间，对应一个二级缓存；
工作机制
- 一个会话查询一条数据，这个数据就会被放在当前会话的一级缓存中；
- 如果当前会话关闭了，这个会话对应的一级缓存就没了；但是我们想要的是，会话关闭了，一级缓存中的数据被保存到二级缓存中；
- 新的会话查询信息，就可以从二级缓存中获取内容；
- 不同的mapper查出的数据就会放在自己对应的缓存（map）中；

开启缓存<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>

复制代码

步骤：

在mybatis-config.xml开启全局缓存
在要使用二级缓存的Mapper中开启
1. <mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers><mappers>
16. <typeAliases>
17. <typeAliases>
18. <mappers>
19. <mappers>
20. <mappers>
21. <settings>
22. <setting name="logImpl" value="STDOUT_LOGGING"/>
23. </settings><package name="com.Ji.dao"/>
24. </mappers><mapper />
25. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
26. </mappers><package name="com.kuang.pojo"/>
27. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
28. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
29. </mappers>
复制代码
也可以自定义参数
1. <mappers>
2. <typeAliases>
3. <typeAliases>
4. <mappers>
5. <mappers>
6. <mappers>
7. <settings>
8. <setting name="logImpl" value="STDOUT_LOGGING"/>
9. </settings><package name="com.Ji.dao"/>
10. </mappers><mapper />
11. </mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
12. </mappers><package name="com.kuang.pojo"/>
13. </typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
14. </typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
15. </mappers>
复制代码
测试
- 问题：如果没有自定义参数，则会报错，我们需要将实体类序列化！
  1. Cause: java.io.NotSerializableException: com.kuang.pojo.User
  复制代码
  小结：
  - 只要开启了二级缓存，在同一个Mapper下就有效；
  - 所有的数据都会先放在一级缓存中；
  - 只有当会话提交或者关闭的时候，才会提交到二级缓存中！

Ⅴ缓存原理

Ⅵ自定义缓存-ehcache

Ehcache是一种广泛使用的开源Java分布式缓存，主要面向通用缓存。
要在程序中使用ehcache，先要导包！
在mapper中指定使用我们的ehcache缓存实现！
目前：Redis数据库来做缓存！K-V

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>

复制代码

免责声明：如果侵犯了您的权益，请联系站长，我们会及时删除侵权内容，谢谢合作！

		自动登录	找回密码
密码			立即注册

后端开发学习记录（四）——Mybatis的学习

本帖子中包含更多资源

0 个回复

快速回复

楼主热帖

标签云

浏览过的版块