In a PerlScript ASP, I am querying an Access DB via ADODB. I am using while (!RS->{EOF}) to step through and parse the data that is returned, but...

what if no records are returned? How can I tell?

A little background as to what caused this problem.

With the following code snippet I get the desired result.

<%
  foreach $scannerID (keys(%scanners)) {
    $SQL = "SELECT Documents, Fronts, FrontsBlank, FrontsRescanned, Fr
+ontsDeleted,
            Rears, RearsBlank, RearsRescanned, RearsDeleted, ProcessSt
+artDate FROM tblXVCSBatch WHERE
            ScanStationID = $scannerID";
#            ProcessStartDate >= $DateQuote $dispStartDate $DateQuote 
+AND 
#            ProcessStartDate <= $DateQuote $dispEndDate $DateQuote";
    $RS = $dbConn->Execute("$SQL");

    while (!$RS->{EOF}) {
      $scanners{$scannerID}->{Batches}++;
      $scanners{$scannerID}->{Documents} += $RS->Fields(0)->{Value};
      $scanners{$scannerID}->{Fronts} += $RS->Fields(1)->{Value};
      $scanners{$scannerID}->{Fronts_Blank} += $RS->Fields(2)->{Value}
+;
      $scanners{$scannerID}->{Fronts_Rescanned} += $RS->Fields(3)->{Va
+lue};
      $scanners{$scannerID}->{Fronts_Deleted} += $RS->Fields(4)->{Valu
+e};
      $scanners{$scannerID}->{Rears} += $RS->Fields(5)->{Value};
      $scanners{$scannerID}->{Rears_Blank} += $RS->Fields(6)->{Value};
      $scanners{$scannerID}->{Rears_Rescanned} += $RS->Fields(7)->{Val
+ue};
      $scanners{$scannerID}->{Rears_Deleted} += $RS->Fields(8)->{Value
+};

      $RS->MoveNext();
    }
  }
%>
[download]

But if I change the SQL statement like so...

    $SQL = "SELECT Documents, Fronts, FrontsBlank, FrontsRescanned, Fr
+ontsDeleted,
            Rears, RearsBlank, RearsRescanned, RearsDeleted, ProcessSt
+artDate FROM tblXVCSBatch WHERE
            ScanStationID = $scannerID AND
            ProcessStartDate >= $DateQuote $dispStartDate $DateQuote A
+ND 
            ProcessStartDate <= $DateQuote $dispEndDate $DateQuote";
[download]

I get a Can't call method "Fields" on unblessed reference error at the first $RS->Fields line.

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