UpdateBatch 和 CancelBatch 方法范例 (VB)

本范例演示 UpdateBatch 和 CancelBatch 方法。

Public Sub UpdateBatchX()

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

    ' Assign connection string to variable.
        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

    ' Loop through recordset and ask user if she wants
    ' to change the type for a specified title.
    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

    ' Ask the user if she wants to commit to all the
    ' changes made above.
    If MsgBox("Save all changes?", vbYesNo) = vbYes Then
        rstTitles.UpdateBatch
    Else
        rstTitles.CancelBatch
    End If

    ' Print current data in recordset.
    rstTitles.Requery
    rstTitles.MoveFirst
    Do While Not rstTitles.EOF
        Debug.Print rstTitles!Title & " - " & rstTitles!Type
        rstTitles.MoveNext
    Loop

    ' Restore original values because this is a demonstration.
    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