Question

我试图在不使用存储过程的情况下编写嵌套事务。它的结构是什么。我尝试了但是得到了一些错误。我的一些变量没有发现，当我试图声明它们时，它说它们已经被声明了。

Begin Transaction campOffer
    Begin Transaction loyaltyCard
        Begin Transaction marketingList
            Insert Into marketing_list values (@custID, @name, @dOB,  
  @gender, @parish, @mobile, @mProvider, @mStatus)
            Select @@TRANCOUNT

            Commit Transaction
        End

        Insert Into Loyalty_Card (Member_ID) Values (@memID)
        Select @@TRANCOUNT

        Commit Transaction
    End

    Insert Into Campaign_Offer values (@offID, @offDate, @custID, @offValue, @prodName, @accepStatus, @empID)
    Select @@TRANCOUNT

    Commit Transaction
End

Answer 1

嵌套交易是一个神话。好。你可以拥有它们。但SQL Server仅将最外层事务视为真实事务。你不能回滚内在的。它将回滚最外层的事务。有关详细信息，请参阅COMMIT和ROLLBACK语句的MSDN常规备注部分。

您对BEGIN TRANSACTION有一个小问题。这不是像BEGIN这样的块语句。因此，一旦声明了变量，它的范围就不会留在COMMIT或ROLLBACK语句中。

Begin Transaction campOffer --@@TRANCOUNT = 1
Begin Transaction loyaltyCard --@@TRANCOUNT = 2
Begin Transaction marketingList --@@TRANCOUNT = 3
Insert Into marketing_list values (@custID, @name, @dOB, @gender,
    @parish, @mobile, @mProvider, @mStatus)
Select @@TRANCOUNT

Commit Transaction --@@TRANCOUNT = 2
--END -- does not correspond to any BEGIN statement

Insert Into Loyalty_Card (Member_ID) Values (@memID)
Select @@TRANCOUNT

Commit Transaction --@@TRANCOUNT = 1
-- END -- does not correspond to any BEGIN statement

Insert Into Campaign_Offer values (@offID, @offDate, @custID, @offValue, @prodName, @accepStatus, @empID)
Select @@TRANCOUNT

Commit Transaction --@@TRANCOUNT = 0... outer transaction is now committed.
--END -- does not correspond to any BEGIN statement

Answer 2

- 在存储过程之外，您必须声明然后为所有参数设置值。

    declare @custID as int, @name as varchar(10), @dOB as date,@gender as varchar(1) 
    --.... (do this for all with appropriate data types)

    -- then set the desired values.
    Set @custID = 101;
        Set @name = 'johnny';
        --(Set all param values)


    Begin Transaction campOffer
    Begin Transaction loyaltyCard
        Begin Transaction marketingList
            Insert Into marketing_list values (@custID, @name, @dOB,  
                                                @gender, @parish, @mobile, @mProvider, @mStatus)
            Select @@TRANCOUNT

            Commit Transaction
        End

        Insert Into Loyalty_Card (Member_ID) Values (@memID)
        Select @@TRANCOUNT

        Commit Transaction
    End

    Insert Into Campaign_Offer values (@offID, @offDate, @custID, @offValue, @prodName, @accepStatus, @empID)
    Select @@TRANCOUNT

    Commit Transaction
End

如何在没有存储过程的情况下执行嵌套事务？

2 个答案: