MySQL递归查询树状表的子节点、父节点_MySQL
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简介:mysql5.0.94版本,该版本以及较高级的版本(5.5、6等等)尚未支持循环递归查询,和sqlserver、oracle相比,mysql难于在树状表中层层遍历的子节点。本程序重点参考了下面的资料,写了两个sql存储过程,子节点查询算是照搬了,父节点查询是逆思维弄的。
资料参考:http://blog.csdn.net/ACMAIN_CHM/article/details/4142971#comments
表结构和表数据就不公示了,查询的表user_role,主键是id,每条记录有parentid字段(对应该记录的父节点,当然,一个父节点自然会有一个以上的子节点嘛)
CREATE FUNCTION `getChildList`(rootId INT) RETURNS varchar(1000) BEGIN DECLARE sChildList VARCHAR(1000); DECLARE sChildTemp VARCHAR(1000); SET sChildTemp =cast(rootId as CHAR); WHILE sChildTemp is not null DO IF (sChildList is not null) THEN SET sChildList = concat(sChildList,',',sChildTemp); ELSE SET sChildList = concat(sChildTemp); END IF; SELECT group_concat(id) INTO sChildTemp FROM user_role where FIND_IN_SET(parentid,sChildTemp)>0; END WHILE; RETURN sChildList; END;/*获取子节点*//*调用: 1、select getChildList(0) id; 2、select * 5From user_role where FIND_IN_SET(id, getChildList(2));*/CREATE FUNCTION `getParentList`(rootId INT) RETURNS varchar(1000) BEGIN DECLARE sParentList varchar(1000); DECLARE sParentTemp varchar(1000); SET sParentTemp =cast(rootId as CHAR); WHILE sParentTemp is not null DO IF (sParentList is not null) THEN SET sParentList = concat(sParentTemp,',',sParentList); ELSE SET sParentList = concat(sParentTemp); END IF; SELECT group_concat(parentid) INTO sParentTemp FROM user_role where FIND_IN_SET(id,sParentTemp)>0; END WHILE; RETURN sParentList; END;/*获取父节点*//*调用: 1、select getParentList(6) id; 2、select * From user_role where FIND_IN_SET(id, getParentList(2));*/

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