Question

当我尝试通过传递@ID和@Name来运行更新信用卡类型时，我收到一条错误消息：

Msg 2786, Level 16, State 1, Procedure sp_SaveCreditCardType, Line 29
The data type of substitution parameter 1 does not match the expected type of the format specification.

问题在于我的代码片段使用以下语句检查CreditCardTypes表中是否存在id：

-- make sure the ID is a valid number
        IF NOT EXISTS (SELECT * FROM CreditCardTypes WHERE ID = @ID)
            BEGIN
                RAISERROR('The Credit Card ID ''%s'' does not exist. Update Failed.', 15, 1, @ID)
                RETURN -100
            END

有没有人知道为什么这可能会给我一个错误？我已经看到很多以这种方式使用if exists（）的例子，但由于某种原因它给了我一个错误。

这是整个过程。

CREATE PROCEDURE dbo.sp_SaveCreditCardType 
(
@ID int = null, 
@Name varchar(50),
@Description varchar(150) = null 
)
AS

DECLARE 
@Err INT

BEGIN 
SET NOCOUNT ON 

-- check to make sure a Name was passed in
IF @Name IS NULL
    BEGIN
        RAISERROR('A Name was not specified. Execution aborted.', 15, 1, @Name)
        RETURN -100
    END

-- check to see if an ID is passed
IF @ID IS NOT NULL AND @ID <> 0
    BEGIN
        -- make sure the ID is a valid number
        IF NOT EXISTS (SELECT * FROM CreditCardTypes WHERE ID = @ID)
            BEGIN
                RAISERROR('The Credit Card ID ''%s'' does not exist. Update Failed.', 15, 1, @ID)
                RETURN -100
            END

        -- update an existing credit card type
        UPDATE CreditCardTypes 
            SET Name = @Name, 
                [Description] = @Description
            WHERE ID = @ID
        SET @Err = @@ERROR
            IF @Err <> 0 GOTO ErrorHandler
    END
ELSE
    BEGIN
        -- first check to make sure the credit card type doesn't already exist
        IF NOT EXISTS (SELECT * FROM CreditCardTypes WHERE Name = @Name)
            BEGIN
                -- insert a new credit card type
                INSERT INTO CreditCardTypes (Name, [Description])
                VALUES (@Name, @Description)

                SET @Err = @@ERROR
                    IF @Err <> 0 GOTO ErrorHandler
            END
        ELSE
            RAISERROR('The Credit Card Type ''%s'' already exists. Insert failed.', 15, 1, @Name)
            RETURN -100
    END

SET @Err = @@ERROR
    IF @Err <> 0 GOTO ErrorHandler
RETURN 0

ErrorHandler:
    RAISERROR('An error occured while saving the credit card type ''%s''', 16, 1, @Name) WITH LOG
    RETURN -100
END
GO

Answer 1

变化：

RAISERROR('The Credit Card ID ''%s'' does not exist. Update Failed.', 15, 1, @ID)

要：

RAISERROR('The Credit Card ID ''%d'' does not exist. Update Failed.', 15, 1, @ID)

%s用于替换字符串...但%d是整数的替换参数。

RAISERROR in MSDN

IF EXISTS（）的问题

1 个答案: