mybatis用Map<Long,List<String>>作为参数

mapper.xml文件里的
<insert id="insertByMap" parameterType="java.util.Map">
    insert ignore into custom_search_enums (`search_field_id`,`value`) values
    <foreach collection="searchKeyMap" index="fieldId" item="key">
        <foreach collection="key" item="enum" separator=",">
            <trim prefix="(" suffix=")">
                #{fieldId},#{enum}
            </trim>
        </foreach>
    </foreach>
</insert>

mapper里的方法：

void insertByMap(@Param("searchKeyMap") Map<Long, Set<String>> map);