Question

我想从microsoft sql server数据库中使用他/她的用户ID检索客户信息到Web表单中，我可以得到一些帮助。

Answer 1

您可以从编写一个定义客户身份的类开始：

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

然后是从数据库中检索此客户的方法：

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

最后在您的网络表单中调用此函数：

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

如果您想避免在代码中编写SQL查询，可以使用ORM，例如Entity Framework。

从sql server数据库中检索信息

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