当遇到实体类属性过于庞大，或者数据库字段过多，不好查询所需要的数据，可以用Map传参。使用方法如下

1.编写接口中的方法(注意参数为Map)

//根据map查询用户
    User getUserByID2(Map map);

2.编写Mapper.xml

<!--万能Map-->
    <select id="getUserByID2" resultType="com.Google.pojo.User" parameterType="Map">
        select * from user where id=#{userid}
    </select>

3.实现

    public void getUserByID2(){
        SqlSession sqlSession = sqlSessionFactory.getsqlSession();
        userMapper mapper = sqlSession.getMapper(userMapper.class);
        Map<String, Object> map = new HashMap<>();
        map.put("userid",3);
        User userByID2 = mapper.getUserByID2(map);
        System.out.println(userByID2);
        sqlSession.close();
    }

标签：Map,map,userMapper,sqlSession,参数,userByID2,getUserByID2,路子
来源： https://www.cnblogs.com/luoking/p/15816840.html