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=1;

DELIMITER $$

USE `dressv_website`$$

DROP FUNCTION IF EXISTS `fn_QueryRelation`$$

CREATE DEFINER=`sa`@`%` FUNCTION `fn_QueryRelation`(AreaId INT,Relation TINYINT(1)) RETURNS VARCHAR(4000) CHARSET utf8
BEGIN
DECLARE sTemp VARCHAR(4000);
DECLARE sTempChd VARCHAR(4000);
SET sTemp = '$';
SET sTempChd = CAST(AreaId AS CHAR);
IF Relation=0 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)>0;
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)>0;
END WHILE;
END IF;
RETURN sTemp;
    END$$

DELIMITER ;

查询语句：

SELECT * FROM product_leimu WHERE FIND_IN_SET(id, fn_QueryRelation(11,0));