MyBatis查詢，返回值Map或List

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、接口定義

 

/**
 * 獲取僅含一個的map（map的size=字段個數）
 * @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、接口定義

 

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