MySQL生成订单号

生成订单号有很多种方式，下面介绍一种自定义函数的方式生产订单号的方式。

 表设计:

CREATE TABLE `t_bizserial` (
  `tagid` int(11) NOT NULL COMMENT '识别号',
  `tradeday` varchar(6) NOT NULL COMMENT '当前交易日',
  `maxbizno` int(11) NOT NULL COMMENT '当前业务号',
  `startno` int(11) NOT NULL COMMENT '当前业务号',
  `prefix` varchar(2) NOT NULL COMMENT '前缀',
  PRIMARY KEY (`tagid`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8

函数:

DELIMITER $$

USE `db_shoping`$$

DROP FUNCTION IF EXISTS `f_getorderno`$$

CREATE DEFINER=`db_shoping`@`%` FUNCTION `f_getorderno`(p_tagid TINYINT) RETURNS VARCHAR(20) CHARSET utf8
    MODIFIES SQL DATA
BEGIN
  
  DECLARE v_tradeday VARCHAR(6);
  DECLARE v_curday VARCHAR(6);
  DECLARE v_prefix VARCHAR(2);
  
  SET v_curday = RIGHT(DATE_FORMAT(CURDATE(),'%Y%m%d'),6);
  SELECT `tradeday`,prefix INTO v_tradeday,v_prefix FROM t_bizserial WHERE tagid = p_tagid;
 
  IF (v_curday <> v_tradeday) THEN
    UPDATE t_bizserial SET 
      `tradeday` = v_curday,
      `maxbizno` = `startno`
    WHERE tagid = p_tagid;
  END IF;
  
  UPDATE t_bizserial SET maxbizno=1+@mno:=maxbizno
  WHERE tagid=p_tagid;
  
  RETURN CONCAT(v_prefix,RIGHT(DATE_FORMAT(CURDATE(),'%Y%m%d'),6),LPAD(@mno,8,'0'));
END$$

DELIMITER ;