1、序列号生成的方法
DELIMITER $$
CREATE DEFINER=`root`@`localhost` FUNCTION `get_workNo`() RETURNS varchar(45) CHARSET utf8
BEGIN
DECLARE newWorkNo varCHAR (45) ;
DECLARE currentDate varCHAR (15) ;-- 当前日期,有可能包含时分秒
DECLARE maxNo INT DEFAULT 0 ;
DECLARE oldWorkNo VARCHAR (25) DEFAULT '' ;-- 离现在最近的满足条件的订单编号
SELECT SUBSTRING(DATE_FORMAT(NOW(), '%Y%m'),3,6) INTO currentDate ;
SELECT IFNULL(workNo, '') INTO oldWorkNo
FROM operation_work
WHERE SUBSTRING(workNo, 3, 4) = currentDate
ORDER BY id DESC LIMIT 1 ; -- 有多条时只显示离现在最近的一条
IF oldWorkNo != '' THEN
SET maxNo = CONVERT(SUBSTRING(oldWorkNo, -4), DECIMAL) ;-- SUBSTRING(oldOrderNo, -5)：订单编号如果不为‘‘截取订单的最后5位
END IF ;
SELECT
CONCAT('TS', currentDate, LPAD((maxNo + 1), 4, '0')) INTO newWorkNo ;
RETURN newWorkNo;
END$$
DELIMITER ;
2、插入数据时的触发器
USE `it_system`;
DELIMITER $$
CREATE DEFINER=`root`@`localhost` TRIGGER `operation_work_BINS` BEFORE INSERT ON `operation_work` FOR EACH ROW
begin SET @workNo = get_workNo();
set NEW.workNo=@workNo;
end
