mysql编写函数返回某个节点的所有父节点组成的字符串。

认真读代码即可看懂，其中 -1为根节点的父级编号。其余多看几遍即可读懂。直接粘贴到navacat 下执行即可。

--获取某个节点所有父节点编号函数？
    DROP FUNCTION IF EXISTS `bhpp2.0_evenmngtservice`.`getParentLst`;
	DELIMITER ;;
	CREATE DEFINER=`root`@`localhost` FUNCTION `bhpp2.0_evenmngtservice`.`getParentLst`(`thingNum` varchar(30)) RETURNS varchar(21845) CHARSET utf8
	BEGIN
	  DECLARE sTemp VARCHAR(21845); 
	  DECLARE sTempParent VARCHAR(30); 
	  DECLARE sTempThingNum VARCHAR(30); 

		SET sTemp = '^'; 
		SET sTempParent = thingNum; 

		WHILE sTempParent !="" AND sTempParent !="-1"   DO 
		  SET sTemp = concat(sTemp,',',sTempParent); 
		  SET sTempThingNum="";
		  SELECT beet.parentthingnum INTO sTempThingNum FROM `bhpp2.0_evenmngtservice`.`eventmngt_thing` beet where FIND_IN_SET(beet.thingnum,sTempParent)>0; 
		  SET sTempParent=sTempThingNum;	
	  END WHILE; 
		RETURN sTemp; 
	END
	;;
	DELIMITER ;