MyBatis查询，返回值Map或List<Map>

https://www.cnblogs.com/xiaoliu66007/p/7908181.html

 

一、返回值Map

1、mapper.xml

 

<select id="selectUserMapLimitOne" resultType="java.util.HashMap">
    select id,name
    from
    user order by id desc limit 1
</select>

 

2、接口定义

 

/**
 * 获取仅含一个的map（map的size=字段个数）
 * @return
 */
Map<String,Object> selectUserMapLimitOne();

 

二、返回值List<Map>

1、mapper.xml

 

 

<select id="selectUserMapList" resultType="java.util.HashMap">
    select id,name from
    user order by id desc limit 2
</select>

 

2、接口定义

 

/**
 * 获取map list
 * @return
 */
List<Map<String,Object>> selectUserMapList();