容器及微服务后端开发学习记录（四）——Mybatis的学习

滴水恩情 发表于 2022-9-16 17:21:15

后端开发学习记录（四）——Mybatis的学习

Mybaits

Mybaits官方文档

官方文档mybatis – MyBatis 3 | Introduction
Mybaits

一、简介

Ⅰ什么是Mybaits

https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818110543119-468769355.png

[*]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(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)

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><dependency>
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><groupId>org.mybatis</groupId>
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><artifactId>mybatis</artifactId>
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><version>3.5.4</version>
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers></dependency>

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
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>mysql<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>mysql-connector-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>8.0.12<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><dependency>
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><groupId>org.mybatis</groupId>
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><artifactId>mybatis</artifactId>
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><version>3.5.4</version>
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers></dependency><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>junit<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>junit<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>4.12<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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>
[*]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
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818110624112-864268924.png
正确创建一个Maven项目的图示：
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818110715782-440181045.png
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）
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 "-//mybatis.org//DTD Config 3.0//EN"
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>"http://mybatis.org/dtd/mybatis-3-config.dtd">

<configuration>
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><environments default="development">
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><environment id="development">
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><transactionManager type="JDBC"/>
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><dataSource type="POOLED">
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 name="driver" value="com.mysql.jdbc.Driver"/>
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 name="url" value="jdbc:mysql://localhost:3306/mybatis?userSSL=true&useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC"/>
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 name="username" value="root"/>
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 name="password" value="123456"/>
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers></dataSource>
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers></environment>
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers></environments>
</configuration>
[*]编写mybatis工具类（写死的，这是固定步骤）
package com.Ji.utils;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;

//sqlSessionFactory --> sqlSession 工厂模式
public class MybatisUtils {

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

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>static {
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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>//使用Mybatis第一步：获取sqlSessionFactory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><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>String resource = "mybatis-config.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>InputStream inputStream = Resources.getResourceAsStream(resource);
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 (IOException 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>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>}
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>}

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>//既然有了 SqlSessionFactory，顾名思义，我们可以从中获得 SqlSession 的实例.
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 提供了在数据库执行 SQL 命令所需的所有方法。
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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();
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>}
}
Ⅲ编写代码

[*]实体类
package com.Ji.pojo;

//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 pwd ;

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 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>public User(int id, String name, String pwd){
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>this.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>this.name = 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><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>this.pwd = pwd;
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>}

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 int getId() {
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 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>public void setId(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><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>this.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>public String getName() {
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 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>}

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

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

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 setPwd(String pwd) {
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>this.pwd = pwd;
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>}

<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>@Override
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 String toString() {
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 "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>"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>", name='" + 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><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>", pwd='" + pwd + '\'' +
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>'}';
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>}
}
[*]Dao接口
public interface UserDao {
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 List<User> getUserList();
}
[*]接口实现类（由原来的UserDaoImpl转变为一个Mapper配置文件）
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 "-//mybatis.org//DTD Mapper 3.0//EN"
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>"http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.kuang.dao.UserDao">
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 id="getUserList" resultType="com.kuang.pojo.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>select * from USER
</select>
</mapper>
resultType="com.Ji.pojo.User" 返回结果集

[*]测试
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111022759-951462188.png
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>资源过滤问题，之前在Maven中强调过！！！
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818110931471-596012373.png

[*]junit测试
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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>//1.获取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>//2.执行SQL<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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>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>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>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>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>//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>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>}
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"/>
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<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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"/>
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</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
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</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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"/>
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</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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"/>
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</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
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</settings><package name="com.Ji.dao"/>
</mappers><mapper />
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</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
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</settings><package name="com.Ji.dao"/>
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</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
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</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
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</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
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</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"/>
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</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
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</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
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<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
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<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
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</settings><package name="com.Ji.dao"/>
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</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
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</mappers><mappers>
<typeAliases>
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<mappers>
<mappers>
<mappers>
<settings>
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<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
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</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
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<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
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</settings><package name="com.Ji.dao"/>
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</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
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</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
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</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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>还有一个报错就是：
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111115722-1270415460.png
将这个改为cj就好了，因为是新版本
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111125076-70627269.png
最后得实现target中有xml才行
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111132345-1226357983.png
命名空间也要注意：
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111140050-333592129.png
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111148913-1288595734.png
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>}}再次温习一般书写步骤
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111213803-1682781263.png
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
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>//查询所有用户<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>public List 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>//插入用户<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>public void addUser(User user);}
[*]编写对应的mapper中的sql语句
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 user (id,name,pwd) values (#{id}, #{name}, #{pwd})
[*]测试
//添加用户<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>@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 addUser(){<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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>mapper.addUser(new User(4,"hui hui~","567"));<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>//增删改一定要提交事务！！！！！<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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.commit();<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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>}注意：增删改查一定要提交事务：
sqlSession.commit();ⅢInsert

[*]编写接口
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>//查询所有用户<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>List 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>//根据ID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 getUserById(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>//添加用户<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>void 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>}
[*]编写对应的mapper中的sql语句
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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.user (id,name,pwd) values (#{id}, #{name}, #{pwd});<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>
[*]测试
//添加用户<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>@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 addUser(){<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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>mapper.addUser(new User(4,"hui hui~","567"));<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>//增删改一定要提交事务！！！！！<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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.commit();<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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>}
Ⅳupdate

[*]编写接口
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>//查询所有用户<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>List 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>//根据ID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 getUserById(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>//添加用户<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>void 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>//修改用户<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>void updateUser(User user);}
[*]编写对应的mapper中的sql语句
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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.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>set name =#{name}, pwd =#{pwd}<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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>
[*]测试
//更新用户<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>@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 updateUser(){<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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>mapper.updateUser(new User(4,"yh","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>sqlSession.commit();<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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>}
ⅤDelete

[*]编写接口
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>//查询所有用户<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>List 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>//根据ID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 getUserById(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>//添加用户<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>void 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>//修改用户<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>void 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>//删除用户<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>void deleteUser(int id);}
[*]编写对应的mapper中的sql语句
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 from mybatis.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>
[*]测试
//删除用户<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>@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 deleteUser(){<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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>mapper.deleteUser(4);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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.commit();<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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>}
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
//用万能Map插入用户
public void addUser2(Map<String,Object> map);
[*]UserMapper.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>insert into user (id,name,password) values (#{userid},#{username},#{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>
[*]测试
//Mapper方法测试@Testpublic void addUser2(){<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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>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>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>map.put("userid",4);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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("username","yuanHui");<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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("password",789);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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.addUser2(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>//增删改一定要提交事务！！！！！<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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.commit();<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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();}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% %
List<User> userList = mapper.getUserLike("%李%");
[*]在sql拼接中使用通配符
select * from user where name like #{value}
[*]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>//模糊查询的实现<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 getUserLike(String value);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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.user where name like #{value};<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>//测试模糊查询<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 getUserLike() {<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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>List<User> userList = mapper.getUserLike("%李%");<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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>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>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>}
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！
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111301300-659278322.png
MyBatis默认的事务管理器就是JDBC ，连接池：POOLED
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111309193-1656365272.png
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111320701-1811924226.png
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=roothttps://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111347803-634094278.png
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）
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111355010-1654335379.png
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111455022-1201657236.png
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.
[*]https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111508630-878924200.png
[*]意在降低冗余的全限定类名书写。
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111523520-226225000.png
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111532446-1120731872.png
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>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!https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111608990-147843303.png
@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>...}Ⅴ设置（Settings）

https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111619838-1859614386.png
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；
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111629005-690042786.png
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>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>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
[*]https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111639914-1884755730.png
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>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：
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111725608-1781932274.png
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！
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111734909-268784979.png
图示理解：
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111743175-1642533857.png
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}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
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111814677-653198829.png
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}解决方法：

[*]起别名
[*]<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 id,name,pwd as password from USER where id = #{id}
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https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111822784-773595622.png
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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>

[*]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）
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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>
[*]如果这个世界总是这么简单就好了。
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111833156-394375067.png
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111841672-182195885.png
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
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111853113-1568730982.png

[*]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>https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111902755-1018091458.png
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
[*]<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>log4j<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>log4j<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>1.2.17
[*]log4j.properties
#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
log4j.rootLogger=DEBUG,console,file

#控制台输出的相关设置
log4j.appender.console = org.apache.log4j.ConsoleAppender
log4j.appender.console.Target = System.out
log4j.appender.console.Threshold=DEBUG
log4j.appender.console.layout = org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=[%c]-%m%n
#文件输出的相关设置
log4j.appender.file = org.apache.log4j.RollingFileAppender
log4j.appender.file.File=./log/rzp.log
log4j.appender.file.MaxFileSize=10mb
log4j.appender.file.Threshold=DEBUG
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=[%p][%d{yy-MM-dd}][%c]%m%n
#日志输出级别
log4j.logger.org.mybatis=DEBUG
log4j.logger.java.sql=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.ResultSet=DEBUG
log4j.logger.java.sq1.PreparedStatement=DEBUG
[*]配置settings为log4j实现
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>
[*]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
Logger logger = Logger.getLogger(UserDaoTest.class);
[*]日志级别
logger.info("info: 测试log4j");
logger.debug("debug: 测试log4j");
logger.error("error:测试log4j");
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818113203600-304821982.png
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 使用MyBatis实现分页，核心SQL

[*]接口
//分页
List<User> getUserByLimit(Map<String,Integer> map);
[*]Mapper.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>select * from user limit #{startIndex},#{pageSize}
[*]测试
@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 getUserByLimit(){<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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>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("startIndex",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>map.put("pageSize",2);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 list = mapper.getUserByLimit(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 (User user : list) {<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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>}
Ⅱ RowBounds分页（通过Java代码层面实现）

不再使用SQL实现分页

[*]接口
//分页2
List<User> getUserByRowBounds();
[*]mapper.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><?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 "-//mybatis.org//DTD Mapper 3.0//EN"
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>"http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.kuang.dao.UserDao">
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 id="getUserList" resultType="com.kuang.pojo.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>select * from USER
</select>
</mapper>
[*]测试
@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>//分页2<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 getUserByRowBounds(){<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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>//RowBounds实现<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>RowBounds rowBounds = new RowBounds(1, 2);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>//通过Java代码层面实现分页<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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.UserMapper.getUserByRowBounds", null, rowBounds);<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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>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>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>}
Ⅲ分页插件（通过第三方插件实现）

MyBatis 分页插件 PageHelper
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111922841-1270390840.png
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
[*]https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111932957-2100100037.png
@Select("select * from user")
List<User> getUsers();
[*]需要在核心配置文件中绑定接口
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>
[*].测试
本质：反射机制实现
底层：动态代理
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818111942562-1069214462.png
**Java的方式不如写resultMap方便**
MyBatis详细执行流程
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818112031159-1027251766.png
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>}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);}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>}}【注意：我们必须将接口文件注册到核心配置文件中】！！！
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818112044632-682476693.png
//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);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
[*]https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818112057423-2071136030.png
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
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818112105930-1189048618.png

[*]在项目中导入lombok的jar包
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>org.projectlombok<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>lombok<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>1.18.10<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>provided
[*]在程序上加注解
@Getter and @Setter<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>@FieldNameConstants<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>@ToString<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>@EqualsAndHashCode<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>@AllArgsConstructor, @RequiredArgsConstructor and @NoArgsConstructor<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>@Log, @Log4j, @Log4j2, @Slf4j, @XSlf4j, @CommonsLog, @JBossLog, @Flogger, @CustomLog<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>@Data<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>@Builder<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>@SuperBuilder<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>@Singular<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>@Delegate<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>@Value<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>@Accessors<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>@Wither<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>@With<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>@SneakyThrows<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>@val说明：
@Data@AllArgsConstructor@NoArgsConstructor@ToStringpublic 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 ;}https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818112119399-1626992286.png
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】
[*]https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818112127679-2031860690.png
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');多对一关系的形成：
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818112135496-1650306861.png
Ⅰ 测试环境搭建

[*]导入Lombok
[*]新建实体类Teacher，Student
package com.Ji.pojo;import lombok.Data;@Datapublic class 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>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>//学生需要关联一个老师<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 Teacher teacher;}package com.Ji.pojo;import lombok.Data;@Datapublic class Teacher {<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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;}
[*]建立Mapper接口
public interface StudentMapper1 {
}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>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 teacher where id = #{tid}") Teacher getTeacher(@Param("tid") int id);}
[*]建立Mapper.XML文件

[*]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】
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>
[*]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>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>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：
@Datapublic class 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>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 int tid;}@Datapublic class Teacher {<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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>//一个老师拥有多个学生<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 List students;}
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> SELECTs.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)])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 * frommybatis.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>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！
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818112200690-208834618.png
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创建一个基础工程

[*]导包
[*]编写配置文件
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 "-//mybatis.org//DTD Config 3.0//EN"
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>"http://mybatis.org/dtd/mybatis-3-config.dtd">

<configuration>
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><environments default="development">
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><environment id="development">
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
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</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><transactionManager type="JDBC"/>
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><dataSource type="POOLED">
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
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</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
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<mappers>
<settings>
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</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
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</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><property name="driver" value="com.mysql.jdbc.Driver"/>
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
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</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
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<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
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</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 name="url" value="jdbc:mysql://localhost:3306/mybatis?userSSL=true&useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC"/>
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
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<settings>
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</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
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</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
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</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
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<mappers>
<mappers>
<settings>
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</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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 name="username" value="root"/>
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
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</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
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<mappers>
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<settings>
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</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
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</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
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</mappers><property name="password" value="123456"/>
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</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>
[*]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; }
[*]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);}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>ⅠIF

https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818112215639-1403691827.png
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);}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>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>}Ⅱ choose (when, otherwise)

https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818112226143-875573588.png
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);}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>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>}Ⅲ trim (where, set)

https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818112235610-523196515.png
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>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>采用如上的代码运行结果为：
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818112244585-1042756094.png
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>}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>}查询结果如下：
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818112255106-781418928.png
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
[*]https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818112303871-751750254.png
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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>父标签：trim
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818112310741-1620803406.png
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。
[*]https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818112318143-697799863.png
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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> 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
[*]https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818112327638-299199202.png
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
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</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>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>
[*]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>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

https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818112338049-230234781.png

[*]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
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818112346103-2031775072.png
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;}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);}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>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>}}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！
sqlSession.clearCache();
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818112358175-457382491.png
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

https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818112405593-1061831121.png
https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818112413738-345188277.png

[*]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> 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
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers><mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>也可以自定义参数
<mappers>
<typeAliases>
<typeAliases>
<mappers>
<mappers>
<mappers>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings><package name="com.Ji.dao"/>
</mappers><mapper />
</mappers><mapper resource="com/Ji/dao/UserMapper.xml"/>
</mappers><package name="com.kuang.pojo"/>
</typeAliases><typeAlias type="com.Ji.pojo.User" alias="User"/>
</typeAliases><mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>
[*]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！
Cause: java.io.NotSerializableException: com.kuang.pojo.User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

https://img2022.cnblogs.com/blog/2817260/202208/2817260-20220818112425639-1091694214.png
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>
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后端开发学习记录（四）——Mybatis的学习