sqlserver 2008实现的转账事务模拟

use master

drop table customer

create table customer(

id int primary key,

account decimal check(account>0),

name varchar(20)

)

--use master

alter table dbo.customer

add check(customer.account>0)

select * from customer

insert into customer values(2012090101,2000,'张三');

insert into customer values(2012090102,1000,'李四');

insert into customer values(2012090103,1000,'王五');

begin transaction

declare @sum int

set @sum=0

update customer set account-=200 where customer.id=2012090101

set @sum+=@@ERROR

update customer set account+=200 where customer.id=2012090102

set @sum+=@@ERROR

--update customer set account-=100 where customer.id=2012090103

if @sum<>0

begin

 print '转账失败'

 rollback transaction

end

else

 begin

 print '成功转账'

 commit transaction

 end

go

select * from customer