Question

我有一个表格，用于存储付款明细与列：（paymentmethod - 包括支票，现金或信用卡），（Checknumber），（Cardholdersname），（{ {1}}）。

问题是：如何在creditcardnumber为paymentmethod时进行验证，或在cash后进行检查，Cardholdersname应留空，creditcardnumber为{ {1}}然后paymentmethod应留空。

Answer 1

你真的有两个不同的表：

PaymentDetails(ID, PaymentMethod) and
CreditCardDetails (PaymentDetailsID, CardholderName, CreditCardNumber)

两个表中的所有列都是不可为空的。

可以将所有三种情况保存在同一个表中。在这种情况下，请尝试以下方法：

CREATE TABLE [dbo].[PaymentDetails]
(
    ID INT IDENTITY(1,1) NOT NULL,
    PaymentMethod INT NOT NULL CHECK (PaymentMethod IN (1,2,3)), -- Cash, Check, Credit
    CheckNumber int NULL,
    CardHoldersName nvarchar(100) NULL,
    CreditCardNumber varchar(20) NULL
)

ALTER TABLE [dbo].[PaymentDetails]
    ADD CONSTRAINT [PaymentTypeConstraint] 
    CHECK  ((PaymentMethod = 1 AND CheckNumber IS NULL AND 
                                   CardholdersName IS NULL AND
                                   CreditCardNumber IS NULL) OR
            (PaymentMethod = 2 AND CheckNumber IS NOT NULL AND 
                                   CardholdersName IS NULL AND
                                   CreditCardNumber IS NULL) OR
            (PaymentMethod = 3 AND CheckNumber IS NULL AND 
                                   CardholdersName IS NOT NULL AND
                                   CreditCardNumber IS NOT NULL));

sql server 2005约束和验证

1 个答案: