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

文章来源: mybatis XML中 遍历map写法