mysql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嘛）

 

CREATE FUNCTION `getChildList`(rootId INT)RETURNS varchar(1000)BEGINDECLARE sChildList VARCHAR(1000);DECLARE sChildTemp VARCHAR(1000);SET sChildTemp =cast(rootId as CHAR);WHILE sChildTemp is not null DOIF (sChildList is not null) THENSET sChildList = concat(sChildList,',',sChildTemp);ELSESET 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)BEGINDECLARE sParentList varchar(1000);DECLARE sParentTemp varchar(1000);SET sParentTemp =cast(rootId as CHAR);WHILE sParentTemp is not null DOIF (sParentList is not null) THENSET sParentList = concat(sParentTemp,',',sParentList);ELSESET 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));*/