Question

我有一个我正在处理的存储过程非常简单，但却给了我一些奇怪的问题。基本上，如果客户在储蓄账户上提款超过2次，则每次提款时他们会收取1.00服务费。

问题在于我似乎只有一个人，它只收取第四次及以后交易的服务费。

以下是存储过程代码：

IF @AccountType = 'Savings' AND @Type = 'W'
    BEGIN
        SELECT @WithdrawCount = WithdrawalCount
        FROM Accounts
        WHERE AccountID = @AccountID

        IF @WithdrawCount > 2
        BEGIN
            SET @ServiceCharge = 1.00

            UPDATE Accounts SET Balance = Balance - @Amount - @ServiceCharge
            WHERE Balance > 0 AND AccountID = @AccountID

            UPDATE Accounts SET WithdrawalCount = WithdrawalCount + 1
            WHERE Balance > 0 AND AccountID = @AccountID

            INSERT INTO Transactions( AccountID, EmplNo, Amount, Description, EnteredBy, ServiceCharge, Type )
            VALUES( @AccountID, @EmplNo, @Amount, @Description, @EnteredBy, @ServiceCharge, @Type )

            SET @TransID = SCOPE_IDENTITY()
            PRINT @TransID
        END
        ELSE
        BEGIN
            SET @ServiceCharge = 0.00

            UPDATE Accounts SET Balance = Balance - @Amount - @ServiceCharge
            WHERE Balance > 0 AND AccountID = @AccountID

            UPDATE Accounts SET WithdrawalCount = WithdrawalCount + 1
            WHERE Balance > 0 AND AccountID = @AccountID

            INSERT INTO Transactions( AccountID, EmplNo, Amount, Description, EnteredBy, ServiceCharge, Type )
            VALUES( @AccountID, @EmplNo, @Amount, @Description, @EnteredBy, @ServiceCharge, @Type )

            SET @TransID = SCOPE_IDENTITY()
            PRINT @TransID
        END

        SELECT @WithdrawCount = WithdrawalCount
        FROM Accounts
        WHERE AccountID = @AccountID
    END

我还完成了每个条件（> = 3，= 3，＆lt; 3）都有if块的版本，但也没有成功。每次我制作一个不同的版本，一旦撤销计数达到3就应该被绊倒，但事实并非如此。任何建议都很棒。

Answer 1

在递增之前，您正在检查提款计数。即第3次，在更新之前，withdrawCount的值将为2而不是3。只需检查它是否大于1或先增加

即使满足条件，IF块也不会被触发

1 个答案: