查找rootid的所有子节点
`DELIMITER //
DROP FUNCTION IF EXISTS getChildLst;
CREATE FUNCTION getChildLst(rootId INT)
RETURNS varchar(1000) READS SQL DATA BEGIN DECLARE sTemp VARCHAR(1000);
DECLARE sTempChd VARCHAR(1000);
SET sTemp = '$';
SET sTempChd =cast(rootId as CHAR);
WHILE sTempChd is not null DO
SET sTemp = concat(sTemp,',',sTempChd);
SELECT group_concat(id) INTO sTempChd FROM project_tags where
FIND_IN_SET(p_id,sTempChd)>0;
END WHILE;
RETURN sTemp;
END // DELIMITER ;`
查找指定id子节点的所有父节点 ` DELIMITER //
DROP FUNCTION IF EXISTS Fun_RecursionDict;
CREATE FUNCTION Fun_RecursionDict (pid INT)
RETURNS VARCHAR(4000)
BEGIN
DECLARE sTemp VARCHAR(4000);
DECLARE sTempChd VARCHAR(4000);
SET sTemp = '$';
SET sTempChd = cast(pid as char);
WHILE sTempChd is not NULL DO
SET sTemp = CONCAT(sTemp,',',sTempChd);
SELECT group_concat(id) INTO sTempChd FROM project_tags where
FIND_IN_SET(p_id,sTempChd)>0;
END WHILE;
return sTemp;
END;
DELIMITER ;`
