从sql server数据库中删除信息

Question

我想使用他/她的用户id从Web服务器数据库中将客户信息从Microsoft SQL Server数据库中删除到Web表单上，我可以得到一些帮助。

Answer 1

你可以通过编写一个类将定义一个客户是什么开始：

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

然后一个方法来从数据库中检索该客户：

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 

，最后调用这个函数您的网页表单：

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

如果您想避免在哟中编写SQL查询你的代码你可以使用ORM，如Entity Framework。