mysql樹查詢，sql遞歸函數

mysql樹查詢，sql遞歸函數

select cateID from goodscategory  where FIND_IN_SET(cateID ,getGoodsChildLst('43242'))


CREATE FUNCTION `getGoodsChildLst`(rootId INT)
     RETURNS varchar(1000)
     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(cateID) INTO sTempChd FROM goodscategory where FIND_IN_SET(parentCateID,sTempChd)>0;
      END WHILE;
       RETURN sTemp;
     END