Java13、Spring之JdbcTemplate - Powered by Discuz! Archiver

卖不甜枣 发表于 2023-8-31 22:39:24

13、Spring之JdbcTemplate

13.1、环境搭建

13.1.1、创建module

https://img2023.cnblogs.com/blog/2052479/202308/2052479-20230821075157720-1152690363.png
13.1.2、选择maven

https://img2023.cnblogs.com/blog/2052479/202308/2052479-20230821075240605-213462184.png
13.1.3、设置module名称和路径

https://img2023.cnblogs.com/blog/2052479/202308/2052479-20230821075337632-380435964.png
https://img2023.cnblogs.com/blog/2052479/202308/2052479-20230821075354646-2126198626.png
13.1.4、module初始状态

https://img2023.cnblogs.com/blog/2052479/202308/2052479-20230821075430986-2007689193.png
13.1.5、配置打包方式和依赖

https://img2023.cnblogs.com/blog/2052479/202308/2052479-20230821075931061-1738081325.png
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>

<groupId>org.rain</groupId>
<artifactId>spring_jdbcTemplate</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>

<dependencies>


   <dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-context</artifactId>
         <version>5.3.1</version>
   </dependency>




   <dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-orm</artifactId>
         <version>5.3.1</version>
   </dependency>


   <dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-test</artifactId>
         <version>5.3.1</version>
   </dependency>


   <dependency>
         <groupId>junit</groupId>
         <artifactId>junit</artifactId>
         <version>4.12</version>
         <scope>test</scope>
   </dependency>


   <dependency>
         <groupId>mysql</groupId>
         <artifactId>mysql-connector-java</artifactId>
         <version>5.1.49</version>
   </dependency>


   <dependency>
         <groupId>com.alibaba</groupId>
         <artifactId>druid</artifactId>
         <version>1.0.31</version>
   </dependency>
</dependencies>

</project>13.1.6、创建jdbc.properties文件

https://img2023.cnblogs.com/blog/2052479/202308/2052479-20230821080226842-614629684.png
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssm?characterEncoding=utf-8
jdbc.username=root
jdbc.password=root13.1.7、创建Spring的配置文件

https://img2023.cnblogs.com/blog/2052479/202308/2052479-20230821080841951-412842136.png
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns:context="http://www.springframework.org/schema/context"
   xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">

<context:property-placeholder location="jdbc.properties"></context:property-placeholder>

<bean id="datasource" >

   <property name="driverClassName" value="${jdbc.driver}"></property>
   <property name="url" value="${jdbc.url}"></property>
   <property name="username" value="${jdbc.username}"></property>
   <property name="password" value="${jdbc.password}"></property>
</bean>

<bean id="jdbcTemplate" >

   <property name="dataSource" ref="datasource"></property>
</bean>

</beans>13.2、Spring整合Junit4单元测试

13.2.1、创建测试类

https://img2023.cnblogs.com/blog/2052479/202308/2052479-20230822080023003-1215908616.png
package org.rain.spring.test;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

/**
* @author liaojy
* @date 2023/8/22 - 7:43
*/

// @RunWith注解：表示使用 SpringJUnit4ClassRunner 运行器来运行测试方法
// 这样测试类便在Spring的测试环境中执行，此时就可以通过注入的方式直接获取IOC容器中的bean
@RunWith(SpringJUnit4ClassRunner.class)
// @ContextConfiguration注解：用来指定加载ApplicationContext的配置文件或配置类
@ContextConfiguration("classpath:spring-jdbc.xml")
public class JdbcTemplateTest {

@Autowired
private JdbcTemplate jdbcTemplate;

@Test
public void testInsert(){
   String sql = "insert into t_user values(null,?,?,?,?,?)";
   jdbcTemplate.update(sql,"jdbcTemplate","123",23,"男","123@qq.com");
}

}13.2.2、执行测试方法

https://img2023.cnblogs.com/blog/2052479/202308/2052479-20230822080211410-164430355.png
++++++++++++++++++++++++++++++分割线++++++++++++++++++++++++++++++
JdbcTemplate的增删改都是用update这个方法
https://img2023.cnblogs.com/blog/2052479/202308/2052479-20230822080858065-1400611250.png
++++++++++++++++++++++++++++++分割线++++++++++++++++++++++++++++++
https://img2023.cnblogs.com/blog/2052479/202308/2052479-20230822080915439-2097599058.png
13.3、JdbcTemplate的查询功能

13.3.1、创建实体类User

https://img2023.cnblogs.com/blog/2052479/202308/2052479-20230822081516402-1340415087.png
package org.rain.spring.pojo;

/**
* @author liaojy
* @date 2023/8/22 - 8:12
*/
public class User {

private Integer id;

private String username;

private String password;

private Integer age;

private String gender;

private String email;

public User(Integer id, String username, String password, Integer age, String gender, String email) {
   this.id = id;
   this.username = username;
   this.password = password;
   this.age = age;
   this.gender = gender;
   this.email = email;
}

public User() {
}

public Integer getId() {
   return id;
}

public void setId(Integer id) {
   this.id = id;
}

public String getUsername() {
   return username;
}

public void setUsername(String username) {
   this.username = username;
}

public String getPassword() {
   return password;
}

public void setPassword(String password) {
   this.password = password;
}

public Integer getAge() {
   return age;
}

public void setAge(Integer age) {
   this.age = age;
}

public String getGender() {
   return gender;
}

public void setGender(String gender) {
   this.gender = gender;
}

public String getEmail() {
   return email;
}

public void setEmail(String email) {
   this.email = email;
}

@Override
public String toString() {
   return "User{" +
            "id=" + id +
            ", username='" + username + '\'' +
            ", password='" + password + '\'' +
            ", age=" + age +
            ", gender='" + gender + '\'' +
            ", email='" + email + '\'' +
            '}';
}
}13.3.2、查询单条数据

https://img2023.cnblogs.com/blog/2052479/202308/2052479-20230824071512686-818347005.png
@Test
public void testGetUserById(){
   String sql = "select * from t_user where id = ?";
   // 第一个参数是设置要执行的sql语句，第二个参数是设置查询结果和实体类的对应关系，后面的参数列表是设置sql语句中占位符的值
   User user = jdbcTemplate.queryForObject(sql, new BeanPropertyRowMapper<User>(User.class), 10);
   System.out.println(user);
}13.3.3、查询多条数据

https://img2023.cnblogs.com/blog/2052479/202308/2052479-20230824072213209-1688512457.png
@Test
public void testGetAllUser(){
   String sql = "select * from t_user";
   List<User> users = jdbcTemplate.query(sql, new BeanPropertyRowMapper<User>(User.class));
   for (User user : users) {
         System.out.println(user);
   }
}13.3.4、查询单行单列

https://img2023.cnblogs.com/blog/2052479/202308/2052479-20230824073006609-560744893.png
@Test
public void testUserCount(){
   String sql = "select count(*) from t_user";
   // 第二个参数是设置查询结果对应的Java类型；如果sql中有占位符，后面可以用参数列表来设置sql语句中占位符的值
   Integer integer = jdbcTemplate.queryForObject(sql, Integer.class);
   System.out.println("用户数量为："+integer);
}
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13、Spring之JdbcTemplate