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,'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
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