mybatisplus使用xml的示例详解

一、配置xml路径

二、编写Mapper里面的方法

三、编写sql

四、测试

五、更改Mapper里面方法入参

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

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