MyBatis XML 配置文件之从配置规范到 CRUD 开发实践记录

# 数据库连接配置
spring:
  datasource:
    url: jdbc:mysql://127.0.0.1:3306/mybatis_test?characterEncoding=utf8&useSSL=false
    username: root
    password: root
    driver-class-name: com.mysql.cj.jdbc.Driver

#驱动类名称
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
#数据库连接的url
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/mybatis_test?characterEncoding=utf8&useSSL=false
#连接数据库的用户名
spring.datasource.username=root
#连接数据库的密码
spring.datasource.password=root

mybatis:
  # 配置 mybatis xml 的文件路径，在 resources/mapper 创建所有表的 xml 文件
  mapper-locations: classpath:mapper/**Mapper.xml
   configuration: # 配置打印 MyBatis日志
     log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
     map-underscore-to-camel-case: true #配置驼峰自动转换

# 配置 mybatis xml 的文件路径，在 resources/mapper 创建所有表的 xml 文件
mybatis.mapper-locations=classpath:mapper/**Mapper.xml
# 配置打印 MyBatis 日志
mybatis.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl
# 配置驼峰自动转换
mybatis.configuration.map-underscore-to-camel-case=true

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="对应的Mapper接口的全限定类名">
</mapper>

<mapper namespace="com.mybatis.demo.mapper.UserInfoXMLMapper">
      <!-- SQL语句   -->
</mapper>

@Mapper
public interface UserInfoXMLMapper {
}

 <insert id="insertUserInfo" parameterType="com.mybatis.demo.model.UserInfo">
        insert into user_info(username,password,age) values (#{username},#{password},#{age})
    </insert>

@Mapper
public interface UserInfoXMLMapper {
       Integer insertUserInfo(UserInfo userInfo);
}

@SpringBootTest
class UserInfoXMLMapperTest {
     @Autowired
     private UserInfoXMLMapper userInfoXMLMapper;
    @Test
    void insertUserInfo() {
        UserInfo userInfo=new UserInfo();
        userInfo.setUsername("张三");
        userInfo.setPassword("123");
        userInfo.setAge(13);
        System.out.println(userInfoXMLMapper.insertUserInfo(userInfo));
    }
}

 </insert>
    <insert id="insertUserInfo2" parameterType="com.mybatis.demo.model.UserInfo" useGeneratedKeys="true" keyProperty="id">
        insert into user_info(username,password,age) values (#{username},#{password},#{age})
    </insert>

<delete id="deleteUser">
        delete from user_info where username=(#{username})
    </delete>

Integer deleteUser(UserInfo userInfo);

@Test
    void deleteUser() {
        UserInfo userInfo=new UserInfo();
        userInfo.setUsername("张三");
        userInfoXMLMapper.deleteUser(userInfo);
    }

    <select id="selectUserById" resultType="com.mybatis.demo.model.UserInfo">
        select username,password,age,phone from user_info where id=(#{id})
    </select>

UserInfo selectUserById(Integer id);

@Test
    void selectUserById() {
        userInfoXMLMapper.selectUserById(1);
    }

Integer updateUser(String username,Integer id);

<update id="updateUser">
        update user_info set username=#{username} where id=#{id}
    </update>

 @Test
    void updateUser() {
        userInfoXMLMapper.updateUser("lisi",2);
    }