建立 根據父節點查詢子節點的function

DELIMITER $$

USE `dpp_new`$$

DROP FUNCTION IF EXISTS `getChildLst`$$

CREATE DEFINER=`tag`@`localhost` FUNCTION `getChildLst`(rootId INT) RETURNS VARCHAR(1000) CHARSET utf8 COLLATE utf8_unicode_ci
BEGIN
	DECLARE sTemp VARCHAR(1000);
		DECLARE sTempChd VARCHAR(1000);
		SET sTemp = '$';
		SET sTempChd =CAST(rootId AS CHAR);
		WHILE sTempChd IS NOT NULL DO
			SET sTemp = CONCAT(sTemp,',',sTempChd);
			SELECT GROUP_CONCAT(area_id) INTO sTempChd FROM com_area WHERE FIND_IN_SET(up_area_id,sTempChd)>0;
		END WHILE;
		RETURN sTemp;
		
    END$$

DELIMITER ;
 

建立 根據子節點查詢父節點的function

DELIMITER $$

USE `dpp_new`$$

DROP FUNCTION IF EXISTS `getParentList`$$

CREATE DEFINER=`tag`@`localhost` FUNCTION `getParentList`(rootId INT) RETURNS VARCHAR(1000) CHARSET utf8 COLLATE utf8_unicode_ci
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(up_area_id) INTO sParentTemp FROM com_area WHERE FIND_IN_SET(area_id,sParentTemp)>0; 
	END WHILE; 
	RETURN sParentList; 
    END$$

DELIMITER ;
 

驗 證查詢：

 SELECT getChildLst(1100);
SELECT * FROM com_area   WHERE FIND_IN_SET(area_id, getChildLst(1300));

SELECT * FROM com_area   WHERE FIND_IN_SET(area_id, getParentList(1310));