标签：arc pre inno _id http 方式 rem drop ret
Mysql 递归查询
定义：父子查询： 根据父 id 查询下面所有子节点数据；子父查询： 根据子 id 查询上面所有父节点数据；
1 创建表
DROP TABLE IF EXISTS `shop`; CREATE TABLE `shop` ( `shop_id` int(11) NOT ‘0‘ AUTO_INCREMENT, `parent_id` int(11) DEFAULT ‘0‘, `name` varchar(255) DEFAULT ‘0‘, PRIMARY KEY (`shop_id`) ) ENGINE=InnoDB AUTO_INCREMENT=65 DEFAULT CHARSET=utf8;
2 初始化数据：
INSERT INTO `shop` VALUES (‘1‘, ‘0‘, ‘总店‘; INSERT INTO `shop` VALUES (‘2‘, ‘1‘, ‘分店1‘; INSERT INTO `shop` VALUES (‘3‘, ‘1‘, ‘分店2‘); INSERT INTO `shop` VALUES (‘4‘, ‘1‘, ‘分店3‘); INSERT INTO `shop` VALUES (‘5‘, ‘1‘, ‘分店4‘); INSERT INTO `shop` VALUES (‘6‘, ‘1‘, ‘分店5‘); INSERT INTO `shop` VALUES (‘7‘, ‘1‘, ‘分店6‘);
3 向下递归
利用find_in_set()函数和group_concat()函数实现递归查询：
DROP FUNCTION IF EXISTS queryChildrShop; CREATE FUNCTION queryChildrShop(shopid INT) RETURNS VARCHAR(4000) BEGIN DECLARE sTemp VARCHAR(4000); DECLARE sTempChd VARCHAR(4000); SET sTemp=‘‘; SET sTempChd = CAST(shopid AS CHAR); WHILE sTempChd IS NOT NULL DO SET sTemp= CONCAT(sTemp,‘,‘,sTempChd); SELECT GROUP_CONCAT(shop_id) INTO sTempChd FROM shop WHERE FIND_IN_SET(parent_Id,sTempChd)>0; END WHILE; RETURN sTemp; END;
4 、调用方法：
select shop_id,parent_id,name from shop where FIND_IN_SET(shop_id,queryChildShop(#{shopId}))
查询说有父节点为1的门店信息
5 向上递归
DROP FUNCTION IF EXISTS queryChildrenAreaInfo1; CREATE FUNCTION queryChildrenAreaInfo1(areaId INT) RETURNS VARCHAR(4000) BEGIN DECLARE sTemp VARCHAR(4000); DECLARE sTempChd VARCHAR(4000); SET sTemp=‘$‘; SET sTempChd = CAST(areaId AS CHAR); SET sTemp = CONCAT(sTemp,‘,‘,sTempChd); SELECT parentId INTO sTempChd FROM t_areainfo WHERE id = sTempChd; WHILE sTempChd <> 0 DO SET sTemp = CONCAT(sTemp,‘,‘,sTempChd); SELECT parentId INTO sTempChd FROM t_areainfo WHERE id = sTempChd; END WHILE; RETURN sTemp; END;
6、调用方式：
select shop_id,parent_id,name from shop where FIND_IN_SET(shop_id,queryChildrenAreaInfo1(#{shopId}))
查询id为"7"的节点的所有上级节点：
标签：arc pre inno _id http 方式 rem drop ret
原文地址：https://www.cnblogs.com/keepruning/p/9112645.html
