1.在springBootStudio项目中添加Module。

2.选择Spring Initializr，点击next。

3.Group填写com.chanchifeng，Artifact填写mysql。

4.勾选SQL中的MySQL和JDBC，点击next。

5.Content_root和Module file location选择springBootStudio项目路径。

6.修改pom.xml的MySQL版本号，核心代码如下：

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<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jdbc</artifactId>
    </dependency>

    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.46</version>
        <scope>runtime</scope>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>

</dependencies>

7.在MySQL中创建一张user表。

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SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for user
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user`  (
  `id` int(32) NOT NULL AUTO_INCREMENT COMMENT '主键',
  `name` varchar(10) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '用户名',
  `password` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '密码',
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 4 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES (1, '李四', 'e10adc3949ba59abbe56e057f20f883e');
INSERT INTO `user` VALUES (2, '张三', 'e10adc3949ba59abbe56e057f20f883e');
INSERT INTO `user` VALUES (3, '阿华', 'e10adc3949ba59abbe56e057f20f883e');

SET FOREIGN_KEY_CHECKS = 1;

8.在application.properties中添加连接MySQL数据库的信息，信息如下：

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###  MySQL 连接信息
spring.datasource.url = jdbc:mysql://127.0.0.1:3306/test?useSSL=true
spring.datasource.username = root
spring.datasource.password = 1qaz2wsx
spring.datasource.driver-class-name = com.mysql.jdbc.Driver

9.在项目中创建一个model包，在其下创建User的类，代码如下：

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public class User {

    private String id;
    private String name;
    private String password;

    public String getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPassword() {
        return password;
    }

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

    @Override
    public String toString() {
        return "AyUser{" +
                "id='" + id + '\'' +
                ", name='" + name + '\'' +
                ", password='" + password + '\'' +
                '}';
    }

}

10.为com.chanchifeng.mysql.MysqlApplicationTests测试类，测试MySQL是否连接成功，核心代码如下：

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@RunWith(SpringRunner.class)
@SpringBootTest
public class MysqlApplicationTests {

    @Autowired
    private JdbcTemplate jdbcTemplate;

    @Test
    public void contextLoads() {
        List<Map<String, Object>> result = jdbcTemplate.queryForList("SELECT * FROM user");
        System.out.println("query result is " + result.size());
        System.out.println("success");
    }

    @Test
    public void testMysqlForUpdate(){
        jdbcTemplate.execute("update user set name='porschan99' where id = 2");
        System.out.println("suc ");
    }

    @Test
    public void mySqlTest(){
        String s = "SELECT * FROM user";
        List<User> userList = jdbcTemplate.query(s, (tempUser, i) -> {
            User user = new User();
            user.setId(tempUser.getString("id"));
            user.setName(tempUser.getString("name"));
            user.setPassword(tempUser.getString("password"));
            return user;
        });
        for (User user : userList) {
            System.out.println(user.toString());
        }
    }

}

11.可以测试contextLoads、testMysqlForUpdate和mySqlTest，其中可以测试contextLoads测试类的输出结果如下：