text: SELECT
  	id
  FROM
  	(
  	SELECT
  		t1.id,
  	IF
  		 ( find_in_set( p_id, @pids ) > 0, @pids := concat( @pids, ',', id ), 0 ) AS ischild
  	FROM
  		( SELECT id, p_id FROM sys_admin t ORDER BY p_id, id ) t1,
  		( SELECT @pids := 18555972869325 ) t2
  		) t3
  WHERE
  	ischild != 0
  
  
  	// 递归查询自己ID下面的节点
  