--- loncom/interface/lontrackstudent.pm	2004/12/22 22:54:59	1.11
+++ loncom/interface/lontrackstudent.pm	2005/02/09 21:21:08	1.13
@@ -1,6 +1,6 @@
 # The LearningOnline Network with CAPA
 #
-# $Id: lontrackstudent.pm,v 1.11 2004/12/22 22:54:59 albertel Exp $
+# $Id: lontrackstudent.pm,v 1.13 2005/02/09 21:21:08 matthew Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -44,10 +44,10 @@ package Apache::lontrackstudent;
 
 use strict;
 use Apache::Constants qw(:common :http);
+use Apache::lonmysql;
 use Apache::lonnet();
 use Apache::lonlocal;
 use Time::HiRes;
-use Time::Local;
 
 sub get_data {
     my ($r,$prog_state,$navmap,$mode) = @_;
@@ -119,10 +119,10 @@ sub table_names {
     my $prefix = $course.'_'.$domain.'_';
     #
     my %tables = 
-        ( student => $prefix.'students',
-          res     => $prefix.'resource',
-          machine => $prefix.'machine_table',
-          activity=> $prefix.'activity',
+        ( student =>&Apache::lonmysql::fix_table_name($prefix.'students'),
+          res     =>&Apache::lonmysql::fix_table_name($prefix.'resource'),
+          machine =>&Apache::lonmysql::fix_table_name($prefix.'machine_table'),
+          activity=>&Apache::lonmysql::fix_table_name($prefix.'activity'),
           );
     return %tables;
 }
@@ -178,14 +178,7 @@ sub get_max_time_in_db {
         $timestr = &Apache::lonnet::unescape($line);
     }
     close(TIMEDATA);
-    my ($year,$month,$day,$hour,$min,$sec) = 
-        ($timestr =~ /^(\d+)-(\d+)-(\d+) (\d+):(\d+):(\d+)/);
-    $month -= 1; # Good old timelocal
-    my $max_time = undef;
-    if (eval("&timelocal($sec,$min,$hour,$day,$month,$year)")) {
-        $max_time = &timelocal($sec,$min,$hour,$day,$month,$year);
-    }
-    return $max_time;
+    return &Apache::lonmysql::unsqltime($timestr);
 }
 
 sub build_query {
@@ -232,6 +225,11 @@ sub output_results {
     my ($r,$results_file,$navmap,$mode) = @_;
     ##
     ##
+    if (! -s $results_file) {
+        # results file is empty, just let them know there is no data
+        $r->print('<h2>'.&mt('No data was returned for your request').'</h2>');
+        return;
+    }
     if (! open(ACTIVITYDATA,$results_file)) {
         $r->print('<h2>'.&mt('Unable to read results file.').'</h2>'.
                   '<p>'.
@@ -526,9 +524,6 @@ sub handler {
         ($r,\%prog_state,&mt('Contacting course home server'));
     #
     my $result = &request_data_update();
-    if (ref($result) eq 'HASH') {
-        $result = join(' ',map { $_.'=>'.$result->{$_}; } keys(%$result));
-    }
     #
     if (exists($ENV{'form.selected_student'})) {
         # For now, just show all the data, in the future allow selection of