snd-escloud/target/classes/mapper/sys/UserGroupDao.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="platform.modules.sys.dao.UserGroupDao">
    <select id="findByGroupName" resultType="String">
        select r.name from sys_user_group  ur
        left join sys_group r on r.id=ur.group_id
        where user_id=#{userId}

    </select>

    <select id="findByGroupIds" resultType="Integer">
        select  group_id from sys_user_group
        where user_id=#{userId}

    </select>

    <select id="findUserIdsByGroupName" resultType="String">
        select group_concat(ur.user_id) 
        	from sys_user_group  ur
        	left join sys_group g on g.id = ur.group_id
        where g.name = #{groupName}

    </select>

    <select id="findByGroupId" resultType="platform.modules.sys.entity.UserGroup">
        select  
        		g.*,
        		u.approve_level
        	from sys_user_group g
        	left join z_user u on u.id = g.user_id
        	where g.group_id=#{id}

    </select>

    <select id="findByUserId" resultType="platform.modules.sys.entity.UserGroup">
        select  *  from sys_user_group
        where user_id=#{userId}

    </select>
    <select id="findUserIdByGroupName" resultType="Integer">
        select  user_Id  from sys_user_group
        where group_id =
        (SELECT id from sys_group where name = #{str} )

    </select>

</mapper>