VB.net SQL錯誤必須聲明標量變量

Question

您好我一直停留很長一段時間在這個簡單而鈍消息「必須聲明標量變量」

我有插入vb.net和SQL代碼數據轉換成簡單的表格。它適用於示例數據，但是當我嘗試使用參數（insertcommand.Parameters.Add（「@ ID」，SqlDbType.Int，3）.Value = 50）時，它給我帶來了錯誤。如果我只用一個數字替換@ID就行。

最終.Value = txtid.text如果我可以得到參數的工作。

感謝您的幫助。

 Dim connection As New SqlConnection 
    Dim connectionString As String = 
      "Data Source=LAPTOP-PC\SQLEXPRESS2008;Initial Catalog=golf;" & 
      "Integrated Security=True" 
    connection.ConnectionString = connectionString 
    Dim insertcommand As New SqlCommand 
    insertcommand.Connection = connection 

    insertcommand.Parameters.Add("@ID", SqlDbType.Int, 3).Value = 50 
    'Must declare the scalar variable 

    Dim insertStatement As String = 
    "INSERT INTO Golf (ID, Title, Firstname, Surname, Gender, DOB, Street, Suburb, City, [Available week days], Handicap)" & 
    "Values(@ID, 'Mr', 'Howard', 'The Duck', 'm', '12/12/23', 'asd', 'sdf', 'City', '0', '56') " 

    Using insertconnection As New SqlConnection(connectionString) 
     Dim adapter As New SqlDataAdapter() 
     Try 
      insertconnection.Open() 
      adapter.InsertCommand = insertconnection.CreateCommand 
      adapter.InsertCommand.CommandText = insertStatement 
      adapter.InsertCommand.ExecuteNonQuery() 

      MsgBox("Data Inserted !! ") 
     Catch ex As Exception 
      MsgBox(ex.ToString) 
     End Try 

    End Using 

Answer 1

的代碼之前聲明的參數是一個位混合起來 - 你建立一個SqlCommand對象，然後不使用它。試試這個：

Using connection As New SqlConnection("Data Source=LAPTOP-PC\SQLEXPRESS2008;Initial Catalog=golf;Integrated Security=True") 
    Dim insertStatement As String = _ 
    "INSERT INTO Golf (ID, Title, Firstname, Surname, Gender, DOB, Street, Suburb, City, [Available week days], Handicap)" _ 
    & "Values(@ID, 'Mr', 'Howard', 'The Duck', 'm', '12/12/23', 'asd', 'sdf', 'City', '0', '56') " 
    Using insertcommand As New SqlCommand(insertStatement, connection) 
     connection.Open() 
     insertcommand.Parameters.AddWithValue("@ID", txtid.Text) 
     insertcommand.ExecuteNonQuery() 
    End Using 
End Using 

Answer 2

嘗試使用

insertcommand.Parameters.AddWithValue("@ID", 50); 

看到一些文檔在這裏：http://msdn.microsoft.com/it-it/library/system.data.sqlclient.sqlcommand.parameters.aspx

Answer 3

爲什麼不只是寫串入一個變量，使用這個變量插入到你的餐桌？

dim ID as string = txtid.text 

如果你想將數據寫入到一個表，你必須把它包起來這樣'data'，就像你與「鴨子」，例如做了。這意味着你的命令字符串必須是這樣的：

"Values('" & ID & "', 'Mr', 'Howard', 'The Duck', 'm', '12/12/23', 'asd', 'sdf', 'City', '0', '56') " 

Answer 4

你需要使用這樣

SqlParameter @ID = new SqlParameter();