DROP PROCEDURE IF EXISTS pro_getNewCG;-- 如果存在,刪除名爲 pro_getNewCG 的存儲過程
CREATE PROCEDURE pro_getNewCG (OUT id VARCHAR(20)) -- 創建存儲過程 名爲:pro_getNewCG 帶一個輸出參數 id
BEGIN -- 固定格式 以 BEGIN 開始 ,END 結束
DECLARE taday VARCHAR (20);-- 申明變量 格式: Declare 變量名 變量類型
DECLARE counts INT;
DECLARE adds INT;
DECLARE maxx VARCHAR (20);
SET taday = DATE_FORMAT(NOW(), '%Y%m%d');-- 給變量賦值 格式 Set = 值
SELECT count(*) INTO counts FROM Stock WHERE substring(sId, 3, 8) = taday; -- 改變變量值 格式 SELECT 結果 INTO 變量名 FROM 表 WHERE 條件
IF (counts > 0) THEN SELECT max( CONVERT (substring(sId, 3, 12), signed)) INTO maxx FROM Stock WHERE substring(sId, 3, 8) = taday;
SET maxx = substring(maxx, 9, LENGTH(maxx) - 8);
IF (maxx = '') THEN SET adds = 1; -- 判斷 格式 IF ELSE END IF
ELSE SET adds = CAST(maxx AS UNSIGNED INTEGER) + 1;
END IF;
SET maxx = CONCAT(taday, adds);
SET id = CONCAT('CG', taday);
SET id = CONCAT('CG', CONVERT(maxx, signed));
ELSE SET id = CONCAT('CG', taday);
END IF;
END;