将nvarchar值'Internet Explorer 3 original'转换为数据类型int时转换失败 [英] Conversion failed when converting the nvarchar value 'Internet Explorer 3 original' to data type int

问题描述

在SQL Server 2008（TSQL）中，我创建了一个这样的存储过程：

In SQL Server 2008 (TSQL), I've created a stored procedure like this:

CREATE PROCEDURE SP_1_10_2
AS
declare @mostValuableBook nvarchar(255)
SELECT @mostValuableBook = Name
FROM books
WHERE price =
    ( SELECT MAX(price)
      FROM books
      WHERE izd LIKE '%BHV%' );
return @mostValuableBook
GO

但是，当我试图执行时它：

But, when I'm trying to execute it:

declare @x nvarchar(255)
EXECUTE @x = SP_1_10_2;
SELECT 'The most expensive BHV book:', @x AS 'Name'
GO

我收到错误：

转换nvarchar值时转换失败'Internet
资源管理器3原始'到数据类型int。

似乎问题在于行

EXECUTE @x = SP_1_10_2;

你能告诉我有什么问题吗？为什么要尝试转换为int？

Can you please tell me what's wrong? Why is it trying to convert to int?

推荐答案

RETURN 不能用于返回 nvarchar / varchar 等。 RETURN用于返回一个整数，这可以表示为某种状态代码1 = True / 0 = False。阅读更多关于返回的信息： http://msdn.microsoft.com/en-us /library/ms174998.aspx

RETURN cannot be used to return nvarchar / varchar such as you have. RETURN is used to return an integer, this can be expressed as some sort of status code 1=True / 0=False. Read more about return here: http://msdn.microsoft.com/en-us/library/ms174998.aspx

在您的情况下，您只需要使用 OUTPUT 变量类似于C＃或C ++中的pass-by-ref。您将变量传递给sproc，sproc修改它，并在 SELECT ... 之后得到预期的结果。

In your case, you simply need to use OUTPUT variables which is similiar to pass-by-ref in C# or C++. You pass the variable to the sproc, the sproc modifies it, and you get the expected results after a SELECT....

更改它以使您的参数成为输出参数：

Change it so that your parameters becomes an output parameter:

CREATE PROCEDURE SP_1_10_2
@mostValueableBook nvarchar(255) output
AS
SELECT @mostValuableBook = Name
FROM books
WHERE price =
    ( SELECT MAX(price)
      FROM books
      WHERE izd LIKE '%BHV%' );
SELECT @mostValuableBook
GO

这样称呼：

DECLARE @theValBook nvarchar(255)
EXECUTE SP_1_10_2 @mostValuableBook = @theValBook output

然后你可以说：

SELECT'最贵的书是'，@ theValBook

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