MySQL递归查询树状表的子节点、父节点

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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));*/