Status-Eigenschaft – Beispiel (Recordset) (VB)
In diesem Beispiel wird die Status-Eigenschaft verwendet, um anzuzeigen, welche Datensätze in einem Batchvorgang geändert wurden, bevor ein Batchupdate durchgeführt wurde.
'BeginStatusRecordsetVB
Public Sub Main()
On Error GoTo ErrorHandler
'To integrate this code
'replace the data source and initial catalog values
'in the connection string
' connection and recordset variables
Dim rstTitles As ADODB.Recordset
Dim Cnxn As ADODB.Connection
Dim strCnxn As String
Dim strSQLTitles As String
' open connection
Set Cnxn = New ADODB.Connection
strCnxn = "Provider='sqloledb';Data Source='MySqlServer';" & _
"Initial Catalog='Pubs';Integrated Security='SSPI';"
Cnxn.Open strCnxn
' open recordset for batch update
Set rstTitles = New ADODB.Recordset
strSQLTitles = "Titles"
rstTitles.Open strSQLTitles, Cnxn, adOpenKeyset, adLockBatchOptimistic, adCmdTable
' change the type of psychology titles
Do Until rstTitles.EOF
If Trim(rstTitles!Type) = "psychology" Then rstTitles!Type = "self_help"
rstTitles.MoveNext
Loop
' display Title ID and status
rstTitles.MoveFirst
Do Until rstTitles.EOF
If rstTitles.Status = adRecModified Then
Debug.Print rstTitles!title_id & " - Modified"
Else
Debug.Print rstTitles!title_id
End If
rstTitles.MoveNext
Loop
' clean up
rstTitles.Close
Cnxn.Close
Set rstTitles = Nothing
Set Cnxn = Nothing
Exit Sub
ErrorHandler:
' clean up
If Not rstTitles Is Nothing Then
If rstTitles.State = adStateOpen Then
' Cancel the update because this is a demonstration
rstTitles.CancelBatch
rstTitles.Close
End If
End If
Set rstTitles = Nothing
If Not Cnxn Is Nothing Then
If Cnxn.State = adStateOpen Then Cnxn.Close
End If
Set Cnxn = Nothing
If Err <> 0 Then
MsgBox Err.Source & "-->" & Err.Description, , "Error"
End If
End Sub
'EndStatusRecordsetVB