MySQL递归查询树状表的子节点、父节点

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));
*/