CREATE TABLE IF NOT EXISTS order_seq(
timestr INT NOT NULL,
order_sn INT NOT NULL);
建立過程
DROP PROCEDURE IF EXISTS `seq_no`;
CREATE DEFINER = `root`@`localhost` PROCEDURE `seq_no`()
BEGIN
DECLARE v_cnt INT; /*聲明變量*/
DECLARE v_timestr INT;
DECLARE rowcount BIGINT;
SET v_timestr=DATE_FORMAT(NOW(),'%Y%m%d'); /*當天日期號*/
SELECT ROUND(RAND()*100,0)+1 INTO v_cnt;/*取隨機數*/
START TRANSACTION; /*啟動事務*/
UPDATE order_seq SET order_sn=order_sn+v_cnt WHERE timestr=v_timestr;/*再前面數據基礎上累加，不會出現重復單號*/
IF ROW_COUNT()=0 THEN
INSERT INTO order_seq(timestr,order_sn) VALUES(v_timestr,v_cnt);
END IF;/*行數為0插入數據*/
SELECT CONCAT(v_timestr,LPAD(order_sn,7,0)) AS order_sn /*日期與隨機數拼接*/
FROM order_seq WHERE timestr=v_timestr;
COMMIT;
END;
