MySQL 获取某一个分类ID的所有父或子分类查询结果

创建一个自定义函数：

set global log_bin_trust_function_creators=;

 DELIMITER $$

 USE `dressv_website`$$

 DROP FUNCTION IF EXISTS `fn_QueryRelation`$$

 CREATE DEFINER=`sa`@`%` FUNCTION `fn_QueryRelation`(AreaId INT,Relation TINYINT()) RETURNS VARCHAR() CHARSET utf8
 BEGIN
 DECLARE sTemp VARCHAR();
 DECLARE sTempChd VARCHAR();
 SET sTemp = '$';
 SET sTempChd = CAST(AreaId AS CHAR);
 IF Relation= THEN
 WHILE sTempChd IS NOT NULL DO
 SET sTemp = CONCAT(sTemp,',',sTempChd);
 SELECT GROUP_CONCAT(parentId) INTO sTempChd FROM product_leimu WHERE FIND_IN_SET(id,sTempChd)>;
 END WHILE;
 ELSE
 WHILE sTempChd IS NOT NULL DO
 SET sTemp = CONCAT(sTemp,',',sTempChd);
 SELECT GROUP_CONCAT(id) INTO sTempChd FROM product_leimu WHERE FIND_IN_SET(parentId,sTempChd)>;
 END WHILE;
 END IF;
 RETURN sTemp;
     END$$

 DELIMITER ;

fn_QueryRelation

查询语句：

 SELECT * FROM product_leimu WHERE FIND_IN_SET(id, fn_QueryRelation(,)); 

MYSQL