MYSQL查询上级和下级
读取 group_id为4的所有下级
SELECT ID.level, DATA.* FROM( SELECT @ids as _ids, ( SELECT @ids := GROUP_CONCAT(group_id) FROM rbac_group WHERE FIND_IN_SET(parent_group_id, @ids) ) as cids, @l := @l+1 as level FROM rbac_group, (SELECT @ids :=4, @l := 0 ) b WHERE @ids IS NOT NULL ) id, rbac_group DATA WHERE FIND_IN_SET(DATA.group_id, ID._ids) ORDER BY level, group_id
读取 group_id为6的所有下级
SELECT ID.level, DATA.* FROM( SELECT @id as _id, ( SELECT @id := parent_group_id FROM rbac_group WHERE group_id = @id ) as _pid, @l := @l+1 as level FROM rbac_group, (SELECT @id := 6, @l := 0 ) b WHERE @id > 0 ) ID, rbac_group DATA WHERE ID._id = DATA.group_id ORDER BY level;