事务==流程控制 确保流程只能成功或者失败，若出现错误会自动回到原点
具体的实现代码如下：
1 begin tran 2 insert into student values('111','王五','男','1999-09-09','95033') 3 if @@ERROR>0 4 goto tranrollback--直接到tranrollback 5 insert into course values('3-102','语文','804') 6 if @@ERROR>0 7 goto tranrollback 8 insert into score values('111','3-102',98) 9 if @@ERROR>0 10 begin 11 tranrollback:---回滚事务 12 rollback tran 13 end 14 else 15 commit tran--提交事务 16 17 18 -------------------格式--------------------
1 begin tran 2 if @@error>0 3 goto tranrollback 4 …… 5 if @@error>0 6 begin 7 tranrollback: 8 rollback tran 9 end 10 else 11 commit tran