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;

 1 DELIMITER $$

 2 

 3 USE `dressv_website`$$

 4 

 5 DROP FUNCTION IF EXISTS `fn_QueryRelation`$$

 6 

 7 CREATE DEFINER=`sa`@`%` FUNCTION `fn_QueryRelation`(AreaId INT,Relation TINYINT(1)) RETURNS VARCHAR(4000) CHARSET utf8

 8 BEGIN

 9 DECLARE sTemp VARCHAR(4000);

10 DECLARE sTempChd VARCHAR(4000);

11 SET sTemp = '$';

12 SET sTempChd = CAST(AreaId AS CHAR);

13 IF Relation=0 THEN 

14 WHILE sTempChd IS NOT NULL DO

15 SET sTemp = CONCAT(sTemp,',',sTempChd);

16 SELECT GROUP_CONCAT(parentId) INTO sTempChd FROM product_leimu WHERE FIND_IN_SET(id,sTempChd)>0;

17 END WHILE;

18 ELSE

19 WHILE sTempChd IS NOT NULL DO

20 SET sTemp = CONCAT(sTemp,',',sTempChd);

21 SELECT GROUP_CONCAT(id) INTO sTempChd FROM product_leimu WHERE FIND_IN_SET(parentId,sTempChd)>0;

22 END WHILE;

23 END IF;

24 RETURN sTemp;

25     END$$

26 

27 DELIMITER ;

fn_QueryRelation

查询语句：

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

MYSQL