從sql server數據庫中刪除信息

Question

我想使用他/她的用戶id從Web服務器數據庫中將客戶信息從Microsoft SQL Server數據庫中刪除到Web表單上，我可以得到一些幫助。

Answer 1

你可以通過編寫一個類將定義一個客戶是什麼開始：

Public Class Customer 
    Public Property Id As Integer 
    Public Property FirstName As String 
    Public Property LastName As String 
End Class 

然後一個方法來從數據庫中檢索該客戶：

Public Function GetCustomer(ByVal CustomerId As Integer) As Customer 
    Using conn = New SqlConnection("Data Source=serverName;Initial Catalog=databaseName;User Id=username;Password=password;") 
     Using cmd = conn.CreateCommand() 
      conn.Open() 
      cmd.CommandText = "SELECT id, first_name, last_name FROM customers WHERE id = @id" 
      cmd.Parameters.AddWithValue("@id", CustomerId) 
      Using reader = cmd.ExecuteReader() 
       While reader.Read() 
        Dim Customer = New Customer() 
        Customer.Id = reader.GetInt32(reader.GetOrdinal("id")) 
        Customer.FirstName = reader.GetInt32(reader.GetOrdinal("first_name")) 
        Customer.LastName = reader.GetInt32(reader.GetOrdinal("last_name")) 
        Return Customer 
       End While 
      End Using 
     End Using 
    End Using 
    Return Nothing 
End Function 

，最後調用這個函數您的網頁表單：

Dim Customer = GetCustomer(123) 
FirstNameTextBox.Text = Customer.FirstName 
... 

如果您想避免在喲中編寫SQL查詢你的代碼你可以使用ORM，如Entity Framework。