MySQL递归查询树状表的子节点、父节点具体实现

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。

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） 

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));

*/