Mysql 遞歸查詢

定義：父子查詢： 根據父 id 查詢下面所有子節點數據；子父查詢： 根據子 id 查詢上面所有父節點數據；

1 創建表

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 初始化數據：

INSERT INTO `shop` VALUES (‘1‘, ‘0‘, ‘總店‘;
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 向下遞歸

利用find_in_set()函數和group_concat()函數實現遞歸查詢：

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 、調用方法：

select shop_id,parent_id,name from shop where FIND_IN_SET(shop_id,queryChildShop(#{shopId}))

查詢說有父節點為1的門店信息

5 向上遞歸

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、調用方式：

select shop_id,parent_id,name from shop where FIND_IN_SET(shop_id,queryChildrenAreaInfo1(#{shopId}))

查詢id為"7"的節點的所有上級節點：

Mysql 遞歸查詢