http://blog.csdn.net/bluestream/article/details/5755176

利用mysql觸發器可以生成如日期(20100721)+編號(0001)的流水號,編號每天都會從0001開始計算

create table orders(orders_id int(10) primary key,customer_name varchar(100)?);

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CREATE TRIGGER tr_orders_id BEFORE INSERT ON orders

FOR EACH ROW BEGIN

declare n int;

select IFNULL(max(right(orders_id,4)),0) into n from orderswhere mid(orders_id,1,8)=DATE_FORMAT(CURDATE(),'%Y%m%d');

set NEW.orders_id=concat(DATE_FORMAT(CURDATE(),'%Y%m%d'),right(10001+n,4));

END;

----------------------------------------------------------------------------

insert into test(customer_name) value('jack');

insert into test(customer_name) value('jason');

-----------------------------------------------------------------------------

orders_id??????????????? customer_name

201007210001?????????????? ?jack

201007210002????????????????jason

.

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