Sql server SQL Server过程更新和合并问题

所以我正在做一个非常简单的更新过程，就像我以前做的一样，但是当我通过它运行执行时，它不会更新。我已经查看了好几次，没有发现任何错误，为什么它不会导致更新通过它。我的手动更新工作正常，所以我想我要么错过了一些非常明显的东西，要么这是与coalesce函数有关的东西。任何帮助都会很好。眼睛越多越开心

USE AdventureWorks2012
GO

CREATE PROCEDURE UpdateCreditCard
@CreditCardID INT,
@CardType nvarchar(50) = NULL,
@CardNumber nvarchar(25) = NULL,
@ExpMonth tinyint = NULL,
@ExpYear smallint = NULL
AS 
BEGIN

UPDATE [Sales].[CreditCard]
SET
    @CardType  = COALESCE(@CardType,CardType),
    @CardNumber  = COALESCE(@CardNumber,CardNumber),
    @ExpMonth  = COALESCE(@ExpMonth,ExpMonth),
    @ExpYear  = COALESCE(@ExpYear,ExpYear)
FROM Sales.CreditCard
WHERE @CreditCardID = CreditCardID
END

---

---

您正在更新

信用卡

表中的

变量

而不是

列

.....
SET
@CardType  = COALESCE(@CardType,CardType),   -- here you are updating the @CardType variable
.....

试试这个

CREATE PROCEDURE UpdateCreditCard
@CreditCardID INT,
@CardType nvarchar(50) = NULL,
@CardNumber nvarchar(25) = NULL,
@ExpMonth tinyint = NULL,
@ExpYear smallint = NULL
AS 
BEGIN

UPDATE [Sales].[CreditCard]
SET
    CardType  = COALESCE(@CardType,CardType),
    CardNumber  = COALESCE(@CardNumber,CardNumber),
    ExpMonth  = COALESCE(@ExpMonth,ExpMonth),
    ExpYear  = COALESCE(@ExpYear,ExpYear)
FROM Sales.CreditCard
WHERE   CreditCardID=@CreditCardID
END

---

运行

从Sales.CreditCard中选择*时会发生什么情况，其中creditcardd=19267

。检查是否有行returnedIt只返回旧数据，而没有返回更新的数据。先生，你太棒了，我一遍又一遍地查看它，没有意识到我把变量更新了，而不是列。这很有魅力。我将不得不注意那些愚蠢的错误。@MikeyZ-每个人都会犯这样的错误。不需要在

SO中使用sir这个词
CREATE PROCEDURE UpdateCreditCard
@CreditCardID INT,
@CardType nvarchar(50) = NULL,
@CardNumber nvarchar(25) = NULL,
@ExpMonth tinyint = NULL,
@ExpYear smallint = NULL
AS 
BEGIN

UPDATE [Sales].[CreditCard]
SET
    CardType  = COALESCE(@CardType,CardType),
    CardNumber  = COALESCE(@CardNumber,CardNumber),
    ExpMonth  = COALESCE(@ExpMonth,ExpMonth),
    ExpYear  = COALESCE(@ExpYear,ExpYear)
FROM Sales.CreditCard
WHERE   CreditCardID=@CreditCardID
END