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"select * from plz where plz.ort = '" & dein_ort & "';"
Dim rst As ADODB.Recordset
Set rst = New ADODB.Recordset
If IsNumeric(Text0) Then
rst.Open "SELECT nrtxt FROM tbl_punzierungsgeb WHERE nrtxt = " & Text0 & ";", CurrentProject.Connection, adOpenStatic, adLockPessimistic, -1
If rst.RecordCount > 0 Then
'Nummer schon vorhanden
Else
'Nummer noch nicht vorhanden
End If
rst.Close
Else
'Eingabe ist nicht numerisch
End If
Set rst = Nothing