mybatis的mapper返回map结果集

通过MapKey指定map的key值

@MapKey( "id")
Map<Long, UserInfo> getUserInfoMap();

@MapKey( "id")
Map<Long, Map<String,Object>> getUserValueMap();

map的value为java类

<resultMap id="UserResultMap" type="com.xixicat.domain.UserInfo">
<result property="id" column="id" />
<result property="username" column="username" />
<result property="sex" column="sex" />
</resultMap>
<select id="getUserInfoMap" resultMap="UserResultMap">
select id,username,sex from user_info
</select>

map的value为map

<select id="getUserValueMap" resultType="map" >
select id,username,sex from user_info
from user_info
</select>