无限极树 sql自定义函数 循环递归

查找rootid的全部子节点

`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;
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END WHILE;

RETURN sTemp;

END // DELIMITER ;`

查找指定id子节点的全部父节点 ` 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 ;`