mysql 编号生成

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1、序列号生成的方法

DELIMITER $$CREATE DEFINER=`root`@`localhost` FUNCTION `get_workNo`() RETURNS varchar(45) CHARSET utf8BEGINDECLARE newWorkNo varCHAR (45) ;DECLARE currentDate varCHAR (15) ;-- 当前日期,有可能包含时分秒     DECLARE maxNo INT DEFAULT 0 ;DECLARE oldWorkNo VARCHAR (25) DEFAULT '' ;-- 离现在最近的满足条件的订单编号     SELECT SUBSTRING(DATE_FORMAT(NOW(), '%Y%m'),3,6) INTO currentDate ;SELECT IFNULL(workNo, '') INTO oldWorkNo       FROM operation_work       WHERE SUBSTRING(workNo, 3, 4) = currentDate          ORDER BY id DESC LIMIT 1 ; -- 有多条时只显示离现在最近的一条     IF oldWorkNo != '' THEN     SET maxNo = CONVERT(SUBSTRING(oldWorkNo, -4), DECIMAL) ;-- SUBSTRING(oldOrderNo, -5)：订单编号如果不为‘‘截取订单的最后5位     END IF ;SELECT     CONCAT('TS', currentDate,  LPAD((maxNo + 1), 4, '0')) INTO newWorkNo ;RETURN newWorkNo;END$$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 ROWbegin SET @workNo = get_workNo();           set NEW.workNo=@workNo;end

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