mybatis XML中 遍历map写法

   <select id="selectMapTest" parameterType="java.util.HashMap" resultMap="BaseResultMap">
        <foreach collection="map1" index="key" item="ent" separator="union">
            SELECT *
            FROM User
            where username=#{key}
            and userpass in
            <foreach collection="ent" item="id" separator="," open="(" close=")">
                #{id}
            </foreach>
        </foreach>

    </select>

　对应的mapper中是：

//map测试
List<User>  selectMapTest(@Param("map1") Map<String,List<Integer>> ma1);

注意:foreach标签中的index就是map的key值