ASP.NET SQL Server存儲過程

Question

所以我想從我的存儲過程擦除從數據庫中GUID @value和檢索的返回值

這是我的存儲過程

ALTER PROCEDURE dbo.verifGuids 
@value char(36), 
@message char(1)Output 
AS 
Begin 

DECLARE @SelectValue char(36) 

select @SelectValue = value FROM guids WHERE @value=value; 

If @value=@SelectValue 
BEGIN 
DELETE value FROM guids WHERE @value=value ; 
SET @message = 0 
END 
Else 
BEGIN 
Set @message = 1 
END 

Return @message 
END 

這是我在asp.net vb.code

Dim guids As String = (Request.QueryString("ID")) 
     'stored procedure get Guid 
     Dim intRowsAff As Integer 
     Dim connectionString As String = WebConfigurationManager.ConnectionStrings("BecsEtMuseauxSQL").ConnectionString 
     Dim con As SqlConnection = New SqlConnection(connectionString) 
     Dim cmd As New SqlCommand("verifGuids", con) 
     cmd.CommandType = CommandType.StoredProcedure 
     cmd.Parameters.Add("@value", SqlDbType.Char, 36).Value = guids 
     Dim returnvalue As New SqlParameter("@message", SqlDbType.Char, 1) 
     returnvalue.Direction = ParameterDirection.Output 
     cmd.Parameters.Add(returnvalue) 

     Try 
      cmd.Connection.Open() 
      intRowsAff = cmd.ExecuteNonQuery() 
      Dim retour As String = (cmd.Parameters("@message").Value.ToString()) 
      If retour = 0 Then 

       InformationLabel.Text = "Votre compte à été vérifier vous pouver vous connecter sur le site" 
      Else 

       InformationLabel.Text = "Votre compte n'est pas aprouvé veuiller vérifier dans vos mail le message de confirmation de votre compte " 
      End If 
     Catch ex As Exception 
      InformationLabel.Text = ex.Message & ex.Source & intRowsAff '& " record(s) inserted" 
     End Try 


     cmd.Connection.Close() 

    End If 

我趕上了錯誤

對象名稱 '價值' 不valid..Net SqlClient數據Provider0

我不明白我做錯了......

這是Vb.net ...

謝謝

Answer 1

我覺得你在你的存儲過程的代碼有一個錯誤：

select @SelectValue = value FROM guids WHERE @value=value; 

這是錯誤的 - 它應該是

SELECT @SelectValue = value FROM guids WHERE value = @value 

同樣在這裏：

DELETE value FROM guids WHERE @value=value ; 

必須將列（value）與傳入的參數（@value）進行比較，而不是反過來！因此，將其更改爲：

DELETE FROM guids WHERE value = @value 

，你應該罰款

你的存儲過程是太多太複雜....你可以把它簡化爲：

ALTER PROCEDURE dbo.verifGuids 
    @value char(36), 
    @message char(1) OUTPUT 
AS 
BEGIN 
    -- this will *already* delete only if the "value" column matches your "@value" 
    -- parameter - there's really no need to first do a SELECT on that table to 
    -- verify that! 
    DELETE FROM dbo.guids WHERE value = @value; 

    IF @@ROWCOUNT > 0 
     SET @message = 0 -- if you deleted anything - the set @message to "0" 
    ELSE 
     SET @message = 1 

    RETURN @message 
END 

Answer 2

你必須使用Out參數作爲返回值。你可以參考這個網站 Parameter Directions，並且你也檢查MSDN Documentaion

Answer 3

你需要改變您在存儲過程中的刪除語句爲：

DELETE FROM test WHERE code=@valueGuid 

Answer 4

將您的ParameterDirection.Output更改爲ParameterDirection.ReturnValue