FUNCTION

1，FUNCTION-1

CREATE FUNCTION `vendor_area_child_ids`(rootId INT)
 RETURNS varchar(1000)
BEGIN
       DECLARE pTemp VARCHAR(1000);
       DECLARE cTemp VARCHAR(1000);  

       SET pTemp = '$';
       SET cTemp =cast(rootId as CHAR);  

       WHILE cTemp is not null DO
         SET pTemp = concat(pTemp,',',cTemp);
         SELECT group_concat(id) INTO cTemp FROM pd_vendor_area WHERE FIND_IN_SET(parent_id,cTemp)>0;
       END WHILE;
       RETURN pTemp;
END;