UpdateBatch 和 CancelBatch 方法范例

该范例连同 CancelBatch 方法说明 UpdateBatch 方法。

Public Sub UpdateBatchX()

   Dim rstTitles As ADODB.Recordset
   Dim strCnn As String
   Dim strTitle As String
   Dim strMessage As String

   ' 将连接字符串赋值给变量。
      strCnn = "Provider=sqloledb;" & _
      "Data Source=srv;Initial Catalog=pubs;User Id=sa;Password=; "

   Set rstTitles = New ADODB.Recordset
   rstTitles.CursorType = adOpenKeyset
   rstTitles.LockType = adLockBatchOptimistic
   rstTitles.Open "titles", strCnn, , , adCmdTable
   
   rstTitles.MoveFirst

   ' 对记录集执行循环并询问用户是否要更改指定标题的类型。
   Do Until rstTitles.EOF
      If Trim(rstTitles!Type) = "psychology" Then
         strTitle = rstTitles!Title
         strMessage = "Title: " & strTitle & vbCr & _
            "Change type to self help?"

         If MsgBox(strMessage, vbYesNo) = vbYes Then
            rstTitles!Type = "self_help"
         End If
      End If

      rstTitles.MoveNext
   Loop

   ' 询问用户是否要提交以上所作的全部更改。
   If MsgBox("Save all changes?", vbYesNo) = vbYes Then
      rstTitles.UpdateBatch
   Else
      rstTitles.CancelBatch
   End If

   ' 打印记录集中的当前数据。
   rstTitles.Requery
   rstTitles.MoveFirst
   Do While Not rstTitles.EOF
      Debug.Print rstTitles!Title & " - " & rstTitles!Type
      rstTitles.MoveNext
   Loop

   ' 恢复原始值，因为这只是演示。
   rstTitles.MoveFirst
   Do Until rstTitles.EOF
      If Trim(rstTitles!Type) = "self_help" Then
         rstTitles!Type = "psychology"
      End If
      rstTitles.MoveNext
   Loop
   rstTitles.UpdateBatch

   rstTitles.Close

End Sub