使用CommandBuilder验证DataGridView中的OleDb

Question

我刚刚发现了关于CommandBuilder的内容，并认为它听起来很直接且易于使用。很明显，我仍然错过了一些东西。我有一个成功更新名为Customers的dbSet表的DataGridView。但它没有更新到实际的数据库文件：

... 
Dim ConMain As New OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\dummy_data.accdb") 
... 
Private Sub CustomerDataGridView_RowValidated(ByVal sender As Object, _ 
    ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) _ 
    Handles CustomerDataGridView.RowValidated 

    Me.CustomersTableAdapter.Update(Me.Dummy_dataDataSet.Customers) 
    Dim CustomerAdapter As New OleDbDataAdapter("Select * From Customers", ConMain) 
    Dim ObjComander As New OleDbCommandBuilder(CustomerAdapter) 
    CustomerAdapter.Update(Dummy_dataDataSet, "Customers") 

End Sub 

它不会抛出一个错误，我做了保存在内存中的所有变化（我可以打开和关闭形式和变化将保持），但它们实际上并未写入数据库。我错过了什么？

Answer 1

试试这个

Dim ConMain As New OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\dummy_data.accdb") 
Dim m_DtCustomer As New DataTable 
Dim CustomerAdapter As OleDbDataAdapter 
Dim m_Bsource As New BindingSource 

'Populate the datagridview 

Sub FillDataGrid() 

    CustomerAdapter = New OleDbDataAdapter("Select * From Customers", ConMain) 
    m_DtCustomer.Clear() 
    CustomerAdapter.Fill(m_DtCustomer) 
    m_Bs.DataSource = m_DtCustomer 
    CustomerDataGridView.Datasource = m_Bs 
End Sub 

'Update changes to the database 

Sub UpdateDatabase() 

    Dim ObjComander As New OleDbCommandBuilder(CustomerAdapter) 
    CustomerAdapter.Update(m_DtCustomer) 

End Sub 

Private Sub CustomerDataGridView_RowValidated(ByVal sender As Object, _ 
ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) _ 
Handles CustomerDataGridView.RowValidated 

    Call Me.UpdateDatabase() 

End Sub