mysql 編號產生,mysql編號

來源:互聯網
上載者:User

mysql 編號產生,mysql編號

1、序號產生的方法

DELIMITER $$CREATE DEFINER=`root`@`localhost` FUNCTION `get_workNo`() RETURNS varchar(45) CHARSET utf8BEGINDECLARE newWorkNo varCHAR (45) ;DECLARE currentDate varCHAR (15) ;-- 當前日期,有可能包含時分秒     DECLARE maxNo INT DEFAULT 0 ;DECLARE oldWorkNo VARCHAR (25) DEFAULT '' ;-- 離現在最近的滿足條件的訂單編號     SELECT SUBSTRING(DATE_FORMAT(NOW(), '%Y%m'),3,6) INTO currentDate ;SELECT IFNULL(workNo, '') INTO oldWorkNo       FROM operation_work       WHERE SUBSTRING(workNo, 3, 4) = currentDate          ORDER BY id DESC LIMIT 1 ; -- 有多條時只顯示離現在最近的一條     IF oldWorkNo != '' THEN     SET maxNo = CONVERT(SUBSTRING(oldWorkNo, -4), DECIMAL) ;-- SUBSTRING(oldOrderNo, -5):訂單編號如果不為‘‘截取訂單的最後5位     END IF ;SELECT     CONCAT('TS', currentDate,  LPAD((maxNo + 1), 4, '0')) INTO newWorkNo ;RETURN newWorkNo;END$$DELIMITER ;

2、插入資料時的觸發器

USE `it_system`;DELIMITER $$CREATE DEFINER=`root`@`localhost` TRIGGER `operation_work_BINS` BEFORE INSERT ON `operation_work` FOR EACH ROWbegin SET @workNo = get_workNo();           set NEW.workNo=@workNo;end


相關文章

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.