This example demonstrates the OriginalValue and UnderlyingValue properties by displaying a message if a record's underlying data has changed during a Recordset batch update.
Public Sub OriginalValueX()
Dim cnn1 As ADODB.Connection
Dim rstTitles As ADODB.Recordset
Dim fldType As ADODB.Field
Dim strCnn As String
' Open connection.
Set cnn1 = New ADODB.Connection
strCnn = "Provider=sqloledb;" & _
"Data Source=srv;Initial Catalog=Pubs;User Id=sa;Password=; "
cnn1.Open strCnn
' Open recordset for batch update.
Set rstTitles = New ADODB.Recordset
Set rstTitles.ActiveConnection = cnn1
rstTitles.CursorType = adOpenKeyset
rstTitles.LockType = adLockBatchOptimistic
rstTitles.Open "Titles"
' Set field object variable for Type field.
Set fldType = rstTitles!Type
' Change the type of psychology titles.
Do Until rstTitles.EOF
If Trim(fldType) = "psychology" Then
fldType = "self_help"
End If
rstTitles.MoveNext
Loop
' Similate a change by another user by updating
' data using a command string.
cnn1.Execute "UPDATE Titles SET type = 'sociology' " & _
"WHERE type = 'psychology'"
'Check for changes.
rstTitles.MoveFirst
Do Until rstTitles.EOF
If fldType.OriginalValue <> _
fldType.UnderlyingValue Then
MsgBox "Data has changed!" & vbCr & vbCr & _
" Title ID: " & rstTitles!title_id & vbCr & _
" Current value: " & fldType & vbCr & _
" Original value: " & _
fldType.OriginalValue & vbCr & _
" Underlying value: " & _
fldType.UnderlyingValue & vbCr
End If
rstTitles.MoveNext
Loop
' Cancel the update because this is a demonstration.
rstTitles.CancelBatch
rstTitles.Close
' Restore original values.
cnn1.Execute "UPDATE Titles SET type = 'psychology' " & _
"WHERE type = 'sociology'"
cnn1.Close
End Sub