SQL Server 简单事务学习

select * from bank
insert into bank values(10000)
insert into bank values(20000)

--打开一个事务
begin tran
--定义临时变量
declare @num int = 0;
update bank set balance=balance-15000 where Id=1
set @num = @num + @@error; --上一条语句出错次数
update bank set balance=balance+15000 where Id=2
set @num = @num + @@error;
if @num <> 0 begin
--回滚事务
rollback tran
end
else  begin
--提交事务
commit tran
end