MySQL父子节点查询
作者:互联网
MySQL父子结点递归查询
表结构:
1 CREATE TABLE `agency` ( 2 `id` varchar(32) NOT NULL COMMENT '编号', 3 `name` varchar(30) NOT NULL COMMENT '名称', 4 `addr` varchar(100) NOT NULL COMMENT '位置', 5 `pId` varchar(32) DEFAULT NULL COMMENT '父ID', 6 PRIMARY KEY (`id`) 7 ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
表数据:
查询子结点的所有父结点:
添加函数:findParent
1 CREATE FUNCTION `findParent`(`subId` varchar(32)) RETURNS varchar(4000) 2 BEGIN 3 DECLARE sTemp VARCHAR(1000); 4 DECLARE sTempPar VARCHAR(1000); 5 SET sTemp = ''; 6 SET sTempPar =subId; 7 #循环递归 8 WHILE sTempPar is not null DO 9 #判断是否是第一个,不加的话第一个会为空 10 IF sTemp != '' THEN 11 SET sTemp = concat(sTemp,',',sTempPar); 12 ELSE 13 SET sTemp = sTempPar; 14 END IF; 15 SET sTemp = concat(sTemp,',',sTempPar); 16 SELECT group_concat(pid) INTO sTempPar FROM agency where pid<>id and FIND_IN_SET(id,sTempPar)>0; 17 END WHILE; 18 RETURN sTemp; 19 END
调用示例:
1 select * from agency where FIND_IN_SET(id,findParent('6'))
显示结果:
查询根结点的所有子结点:
添加函数:findSubNode
1 CREATE FUNCTION `findSubNode`(`orgid` varchar(32)) RETURNS varchar(4000) 2 BEGIN 3 DECLARE oTemp VARCHAR(4000); 4 DECLARE oTempChild VARCHAR(4000); 5 SET oTemp = ''; 6 SET oTempChild = orgid; 7 WHILE oTempChild IS NOT NULL 8 DO 9 SET oTemp = CONCAT(oTemp,',',oTempChild); 10 SELECT GROUP_CONCAT(id) INTO oTempChild FROM agency WHERE FIND_IN_SET(pId,oTempChild) > 0; 11 END WHILE; 12 RETURN oTemp; 13 END
调用示例:
1 select * from agency where FIND_IN_SET(id,findSubNode('2'))
显示结果:
标签:sTempPar,SET,varchar,查询,sTemp,MySQL,id,oTempChild,节点 来源: https://www.cnblogs.com/wdzhz/p/10748765.html