编写简单的事务应用

begin transaction tran_bank;

declare @tran_error int;

set @tran_error = 0;

begin try

update bank set totalMoney = totalMoney - 10000 where userName = 'jack';

set @tran_error = @tran_error + @@error;

update bank set totalMoney = totalMoney + 10000 where userName = 'jason';

set @tran_error = @tran_error + @@error;

end try

begin catch

print '出现异常，错误编号：' + convert(varchar, error_number()) + '， 错误消息：' + error_message();

set @tran_error = @tran_error + 1;

end catch

if (@tran_error > 0)

begin

--执行出错，回滚事务

rollback tran;

print '转账失败，取消交易';

end

else

begin

--没有异常，提交事务

commit tran;

print '转账成功';

end

go