mybatisplus使用xml的示例详解

一、配置xml路径

mybatis-plus:
mapper-locations: classpath:mapper/*.xml

二、编写Mapper里面的方法

public interface UserMapper extends BaseMapper {
List findAll();

List<User> selectByXml(@Param("name") String name);
}

三、编写sql

<select id="selectByXml" resultType="com.example.mybatisplusdemo.sample.model.User">
   select *
   from user
   <where>
       <if test="name != null and name != ''">
           and name = #{name}
       </if>
   </where>
</select>

四、测试

@Test
void test7(){
List users = userMapper.selectByXml("Jone");
users.stream().forEach(System.out::println);
}

结果：

==>  Preparing: select * from user WHERE name = ?
==> Parameters: Jone(String)
<==    Columns: ID, NAME, AGE, EMAIL
<==        Row: 1, Jone, 18, test1@baomidou.com
<==      Total: 1

五、更改Mapper里面方法入参

public interface UserMapper extends BaseMapper {
List findAll();

// List selectByXml(@Param("name") String name);

List<User> selectByXml(@Param("ew") Wrapper<User> queryWrapper);
}

<select id="selectByXml" resultType="com.example.mybatisplusdemo.sample.model.User">
   select *
   from user
    ${ew.customSqlSegment}
</select>

测试：

@Test
void test7(){
   List<User> users = userMapper.selectByXml(new QueryWrapper<User>().eq("name","Jone"));
   users.stream().forEach(System.out::println);
}

执行结果：

==>  Preparing: select * from user WHERE (name = ?)
==> Parameters: Jone(String)
<==    Columns: ID, NAME, AGE, EMAIL
<==        Row: 1, Jone, 18, test1@baomidou.com
<==      Total: 1

来源：https://www.cnblogs.com/shigongp/p/16607212.html