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Diff for /loncom/interface/loncoursedata.pm between versions 1.61 and 1.81.2.1

version 1.61, 2003/03/25 22:29:31 version 1.81.2.1, 2003/10/01 21:41:47
Line 104  sub get_sequence_assessment_data { Line 104  sub get_sequence_assessment_data {
     my $fn=$ENV{'request.course.fn'};      my $fn=$ENV{'request.course.fn'};
     ##      ##
     ## use navmaps      ## use navmaps
     my $navmap = Apache::lonnavmaps::navmap->new(Apache->request,$fn.".db",      my $navmap = Apache::lonnavmaps::navmap->new($fn.".db",
                                                  $fn."_parms.db",1,0);                                                   $fn."_parms.db",1,0);
     if (!defined($navmap)) {      if (!defined($navmap)) {
         return 'Can not open Coursemap';          return 'Can not open Coursemap';
     }      }
       # We explicity grab the top level map because I am not sure we
       # are pulling it from the iterator.
       my $top_level_map = $navmap->getById('0.0');
       #
     my $iterator = $navmap->getIterator(undef, undef, undef, 1);      my $iterator = $navmap->getIterator(undef, undef, undef, 1);
     my $curRes = $iterator->next(); # Top level sequence      my $curRes = $iterator->next(); # Top level sequence
     ##      ##
Line 118  sub get_sequence_assessment_data { Line 122  sub get_sequence_assessment_data {
     ## resources.  This means we have to start out with something to look      ## resources.  This means we have to start out with something to look
     ## at.      ## at.
     my $title = $ENV{'course.'.$ENV{'request.course.id'}.'.description'};      my $title = $ENV{'course.'.$ENV{'request.course.id'}.'.description'};
     my $symb  = 'top';      my $symb  = $top_level_map->symb();
     my $src   = 'not applicable';      my $src   = $top_level_map->src();
       my $randompick = $top_level_map->randompick();
     #      #
     my @Sequences;       my @Sequences; 
     my @Assessments;      my @Assessments;
Line 130  sub get_sequence_assessment_data { Line 135  sub get_sequence_assessment_data {
                 type     => 'container',                  type     => 'container',
                 num_assess => 0,                  num_assess => 0,
                 num_assess_parts => 0,                  num_assess_parts => 0,
                 contents   => [], };                  contents   => [], 
                   randompick => $randompick,
               };
     push (@Sequences,$top);      push (@Sequences,$top);
     push (@Nested_Sequences, $top);      push (@Nested_Sequences, $top);
     #      #
     # We need to keep track of which sequences contain homework problems      # We need to keep track of which sequences contain homework problems
     #       # 
       my $previous_too;
     my $previous;      my $previous;
     $curRes = $iterator->next(); # BEGIN_MAP  
     $curRes = $iterator->next(); # The first item in the top level map.  
     while (scalar(@Nested_Sequences)) {      while (scalar(@Nested_Sequences)) {
           $previous_too = $previous;
         $previous = $curRes;          $previous = $curRes;
         $curRes = $iterator->next();          $curRes = $iterator->next();
         my $currentmap = $Nested_Sequences[-1]; # Last one on the stack          my $currentmap = $Nested_Sequences[-1]; # Last one on the stack
         if ($curRes == $iterator->BEGIN_MAP()) {          if ($curRes == $iterator->BEGIN_MAP()) {
               if (! ref($previous)) {
                   $previous = $previous_too;
               }
               if (! ref($previous)) {
                   next;
               }
             # get the map itself, instead of BEGIN_MAP              # get the map itself, instead of BEGIN_MAP
             $title = $previous->title();              $title = $previous->title();
             $symb  = $previous->symb();              $symb  = $previous->symb();
             $src   = $previous->src();              $src   = $previous->src();
               # pick up the filename if there is no title available
               if (! defined($title) || $title eq '') {
                   ($title) = ($src=~/\/([^\/]*)$/);
               }
               $randompick = $previous->randompick();
             my $newmap = { title    => $title,              my $newmap = { title    => $title,
                            src      => $src,                             src      => $src,
                            symb     => $symb,                             symb     => $symb,
                            type     => 'container',                             type     => 'container',
                            num_assess => 0,                             num_assess => 0,
                              randompick => $randompick,
                            contents   => [],                             contents   => [],
                        };                         };
             push (@{$currentmap->{'contents'}},$newmap); # this is permanent              push (@{$currentmap->{'contents'}},$newmap); # this is permanent
Line 211  sub LoadDiscussion { Line 230  sub LoadDiscussion {
     return \%Discuss;      return \%Discuss;
 }  }
   
   ################################################
   ################################################
   
   =pod
   
   =item &GetUserName(username,userdomain)
   
   Returns a hash with the following entries:
      'firstname', 'middlename', 'lastname', 'generation', and 'fullname'
   
      'fullname' is the result of &Apache::loncoursedata::ProcessFullName.
   
   =cut
   
   ################################################
   ################################################
   sub GetUserName {
       my ($username,$userdomain) = @_;
       $username = $ENV{'user.name'} if (! defined($username));
       $userdomain = $ENV{'user.domain'} if (! defined($username));
       my %userenv = &Apache::lonnet::get('environment',
                              ['firstname','middlename','lastname','generation'],
                                          $userdomain,$username);
       $userenv{'fullname'} = &ProcessFullName($userenv{'lastname'},
                                               $userenv{'generation'},
                                               $userenv{'firstname'},
                                               $userenv{'middlename'});
       return %userenv;
   }
   
   ################################################
   ################################################
   
 =pod  =pod
   
 =item &ProcessFullName()  =item &ProcessFullName()
Line 221  is Lastname generation, firstname middle Line 273  is Lastname generation, firstname middle
   
 =cut  =cut
   
   ################################################
   ################################################
 sub ProcessFullName {  sub ProcessFullName {
     my ($lastname, $generation, $firstname, $middlename)=@_;      my ($lastname, $generation, $firstname, $middlename)=@_;
     my $Str = '';      my $Str = '';
Line 422  sub init_dbs { Line 476  sub init_dbs {
     my $courseid = shift;      my $courseid = shift;
     &setup_table_names($courseid);      &setup_table_names($courseid);
     #      #
       # Drop any of the existing tables
       foreach my $table ($symb_table,$part_table,$student_table,
                          $updatetime_table,$performance_table,
                          $parameters_table) {
           &Apache::lonmysql::drop_table($table);
       }
       #
     # Note - changes to this table must be reflected in the code that       # Note - changes to this table must be reflected in the code that 
     # stores the data (calls &Apache::lonmysql::store_row with this table      # stores the data (calls &Apache::lonmysql::store_row with this table
     # id      # id
Line 494  sub init_dbs { Line 555  sub init_dbs {
                     { name => 'part_id',                      { name => 'part_id',
                       type => 'MEDIUMINT UNSIGNED',                        type => 'MEDIUMINT UNSIGNED',
                       restrictions => 'NOT NULL' },                        restrictions => 'NOT NULL' },
                       { name => 'part',
                         type => 'VARCHAR(100)',
                         restrictions => 'NOT NULL'},                    
                     { name => 'solved',                      { name => 'solved',
                       type => 'TINYTEXT' },                        type => 'TINYTEXT' },
                     { name => 'tries',                      { name => 'tries',
Line 506  sub init_dbs { Line 570  sub init_dbs {
                       type => 'TINYTEXT' },                        type => 'TINYTEXT' },
                     { name => 'timestamp',                      { name => 'timestamp',
                       type => 'INT UNSIGNED'},                        type => 'INT UNSIGNED'},
                     { name => 'weight',  
                       type => 'INT UNSIGNED'},  
                     ],                      ],
         'PRIMARY KEY' => ['symb_id','student_id','part_id'],          'PRIMARY KEY' => ['symb_id','student_id','part_id'],
         'KEY' => [{ columns=>['student_id'] },          'KEY' => [{ columns=>['student_id'] },
Line 583  sub init_dbs { Line 645  sub init_dbs {
   
 =pod  =pod
   
   =item &delete_caches()
   
   =cut
   
   ################################################
   ################################################
   sub delete_caches {
       my $courseid = shift;
       $courseid = $ENV{'request.course.id'} if (! defined($courseid));
       #
       &setup_table_names($courseid);
       #
       my $dbh = &Apache::lonmysql::get_dbh();
       foreach my $table ($symb_table,$part_table,$student_table,
                          $updatetime_table,$performance_table,
                          $parameters_table ){
           my $command = 'DROP TABLE '.$table.';';
           $dbh->do($command);
           if ($dbh->err) {
               &Apache::lonnet::logthis($command.' resulted in error: '.$dbh->errstr);
           }
       }
       return;
   }
   
   ################################################
   ################################################
   
   =pod
   
 =item &get_part_id()  =item &get_part_id()
   
 Get the MySQL id of a problem part string.  Get the MySQL id of a problem part string.
Line 828  sub update_student_data { Line 920  sub update_student_data {
                                  $sname.':'.$sdom.' in course '.$courseid.                                   $sname.':'.$sdom.' in course '.$courseid.
                                  ':'.$tmp[0]);                                   ':'.$tmp[0]);
         $returnstatus = 'error getting data';          $returnstatus = 'error getting data';
         return $returnstatus;          return ($returnstatus,undef);
     }      }
     if (scalar(@tmp) < 1) {      if (scalar(@tmp) < 1) {
         return ('no data',undef);          return ('no data',undef);
Line 852  sub update_student_data { Line 944  sub update_student_data {
     my $num_parameters = 0;      my $num_parameters = 0;
     my $store_performance_command = 'INSERT INTO '.$performance_table.      my $store_performance_command = 'INSERT INTO '.$performance_table.
         ' VALUES '."\n";          ' VALUES '."\n";
     return 'error' if (! defined($dbh));      return ('error',undef) if (! defined($dbh));
     while (my ($current_symb,$param_hash) = each(%student_data)) {      while (my ($current_symb,$param_hash) = each(%student_data)) {
         #          #
         # make sure the symb is set up properly          # make sure the symb is set up properly
         my $symb_id = &get_symb_id($current_symb);          my $symb_id = &get_symb_id($current_symb);
         #          #
         # Load data into the tables          # Load data into the tables
         foreach my $parameter (keys(%$param_hash)) {          while (my ($parameter,$value) = each(%$param_hash)) {
             my $value = $param_hash->{$parameter};  
             my $newstring;              my $newstring;
             if ($parameter !~ /(timestamp|resource\.(.*)\.(solved|tries|awarded|award|awarddetail|previous|weight))/) {              if ($parameter !~ /(timestamp|resource\.(.*)\.(solved|tries|awarded|award|awarddetail|previous))/) {
                 $newstring = "('".join("','",                  $newstring = "('".join("','",
                                        $symb_id,$student_id,                                         $symb_id,$student_id,
                                        $parameter,$value)."'),\n";                                         $parameter)."',".
                                              $dbh->quote($value)."),\n";
                 $num_parameters ++;                  $num_parameters ++;
                 if ($newstring !~ /''/) {                  if ($newstring !~ /''/) {
                     $store_parameters_command .= $newstring;                      $store_parameters_command .= $newstring;
Line 883  sub update_student_data { Line 975  sub update_student_data {
             my $award   = $param_hash->{'resource.'.$part.'.award'};              my $award   = $param_hash->{'resource.'.$part.'.award'};
             my $awarddetail = $param_hash->{'resource.'.$part.'.awarddetail'};              my $awarddetail = $param_hash->{'resource.'.$part.'.awarddetail'};
             my $timestamp = $param_hash->{'timestamp'};              my $timestamp = $param_hash->{'timestamp'};
             # use EXT to get the weight  
             my $weight  = &Apache::lonnet::EXT('resource.'.$part.'.weight',  
                                                $current_symb,$sdom,$sname);  
             # Give the weight back to the user  
             $param_hash->{'resource.'.$part.'.weight'}=$weight;  
             #              #
             $solved      = '' if (! defined($awarded));              $solved      = '' if (! defined($solved));
             $tries       = '' if (! defined($tries));              $tries       = '' if (! defined($tries));
             $awarded     = '' if (! defined($awarded));              $awarded     = '' if (! defined($awarded));
             $award       = '' if (! defined($award));              $award       = '' if (! defined($award));
             $awarddetail = '' if (! defined($awarddetail));              $awarddetail = '' if (! defined($awarddetail));
             $newstring = "('".join("','",$symb_id,$student_id,$part_id,              $newstring = "('".join("','",$symb_id,$student_id,$part_id,$part,
                                    $solved,$tries,$awarded,$award,                                     $solved,$tries,$awarded,$award,
                                    $awarddetail,$timestamp,$weight)."'),\n";                                     $awarddetail,$timestamp)."'),\n";
             $store_performance_command .= $newstring;              $store_performance_command .= $newstring;
             $rows_stored++;              $rows_stored++;
         }          }
Line 911  sub update_student_data { Line 998  sub update_student_data {
         &Apache::lonnet::logthis(' bigass insert error:'.$dbh->errstr());          &Apache::lonnet::logthis(' bigass insert error:'.$dbh->errstr());
         &Apache::lonnet::logthis('command = '.$store_parameters_command);          &Apache::lonnet::logthis('command = '.$store_parameters_command);
         $returnstatus = 'error: unable to insert parameters into database';          $returnstatus = 'error: unable to insert parameters into database';
         return $returnstatus,\%student_data;          return ($returnstatus,\%student_data);
     }      }
     $dbh->do($store_performance_command);      $dbh->do($store_performance_command);
     if ($dbh->err()) {      if ($dbh->err()) {
         &Apache::lonnet::logthis(' bigass insert error:'.$dbh->errstr());          &Apache::lonnet::logthis(' bigass insert error:'.$dbh->errstr());
         &Apache::lonnet::logthis('command = '.$store_performance_command);          &Apache::lonnet::logthis('command = '.$store_performance_command);
         $returnstatus = 'error: unable to insert performance into database';          $returnstatus = 'error: unable to insert performance into database';
         return $returnstatus,\%student_data;          return ($returnstatus,\%student_data);
     }      }
     $elapsed += Time::HiRes::time - $start;      $elapsed += Time::HiRes::time - $start;
     #      #
Line 974  sub ensure_current_data { Line 1061  sub ensure_current_data {
         !$found_student     || !$found_part   ||          !$found_student     || !$found_part   ||
         !$found_performance || !$found_parameters) {          !$found_performance || !$found_parameters) {
         if (&init_dbs($courseid)) {          if (&init_dbs($courseid)) {
             return 'error';              return ('error',undef);
         }          }
     }      }
     #      #
Line 1038  sub get_student_data_from_performance_ca Line 1125  sub get_student_data_from_performance_ca
     #      #
     my $dbh = &Apache::lonmysql::get_dbh();      my $dbh = &Apache::lonmysql::get_dbh();
     my $request = "SELECT ".      my $request = "SELECT ".
         "d.symb,c.part,a.solved,a.tries,a.awarded,a.award,a.awarddetail,".          "d.symb,a.part,a.solved,a.tries,a.awarded,a.award,a.awarddetail,".
             "a.timestamp,a.weight ";              "a.timestamp ";
     if (defined($student)) {      if (defined($student)) {
         $request .= "FROM $student_table AS b ".          $request .= "FROM $student_table AS b ".
             "LEFT JOIN $performance_table AS a ON b.student_id=a.student_id ".              "LEFT JOIN $performance_table AS a ON b.student_id=a.student_id ".
             "LEFT JOIN $part_table AS c ON c.part_id = a.part_id ".  #            "LEFT JOIN $part_table AS c ON c.part_id = a.part_id ".
             "LEFT JOIN $symb_table AS d ON d.symb_id = a.symb_id ".              "LEFT JOIN $symb_table AS d ON d.symb_id = a.symb_id ".
                 "WHERE student='$student'";                  "WHERE student='$student'";
         if (defined($symb) && $symb ne '') {          if (defined($symb) && $symb ne '') {
             $request .= " AND d.symb='".$dbh->quote($symb)."'";              $request .= " AND d.symb=".$dbh->quote($symb);
         }          }
     } elsif (defined($symb) && $symb ne '') {      } elsif (defined($symb) && $symb ne '') {
         $request .= "FROM $symb_table as d ".          $request .= "FROM $symb_table as d ".
             "LEFT JOIN $performance_table AS a ON d.symb_id=a.symb_id ".              "LEFT JOIN $performance_table AS a ON d.symb_id=a.symb_id ".
             "LEFT JOIN $part_table    AS c ON c.part_id = a.part_id ".  #            "LEFT JOIN $part_table    AS c ON c.part_id = a.part_id ".
             "LEFT JOIN $student_table AS b ON b.student_id = a.student_id ".              "LEFT JOIN $student_table AS b ON b.student_id = a.student_id ".
                 "WHERE symb='".$dbh->quote($symb)."'";                  "WHERE symb='".$dbh->quote($symb)."'";
     }      }
Line 1068  sub get_student_data_from_performance_ca Line 1155  sub get_student_data_from_performance_ca
     }      }
     foreach my $row (@{$sth->fetchall_arrayref}) {      foreach my $row (@{$sth->fetchall_arrayref}) {
         $rows_retrieved++;          $rows_retrieved++;
         my ($symb,$part,$solved,$tries,$awarded,$award,$awarddetail,$time,$weight) =           my ($symb,$part,$solved,$tries,$awarded,$award,$awarddetail,$time) = 
             (@$row);              (@$row);
         my $base = 'resource.'.$part;          my $base = 'resource.'.$part;
         $studentdata->{$symb}->{$base.'.solved'}  = $solved;          $studentdata->{$symb}->{$base.'.solved'}  = $solved;
Line 1077  sub get_student_data_from_performance_ca Line 1164  sub get_student_data_from_performance_ca
         $studentdata->{$symb}->{$base.'.award'}   = $award;          $studentdata->{$symb}->{$base.'.award'}   = $award;
         $studentdata->{$symb}->{$base.'.awarddetail'} = $awarddetail;          $studentdata->{$symb}->{$base.'.awarddetail'} = $awarddetail;
         $studentdata->{$symb}->{'timestamp'} = $time if (defined($time) && $time ne '');          $studentdata->{$symb}->{'timestamp'} = $time if (defined($time) && $time ne '');
         $studentdata->{$symb}->{'resource.'.$part.'.weight'}=$weight;      }
       ## Get misc parameters
       $request = 'SELECT c.symb,a.parameter,a.value '.
           "FROM $student_table AS b ".
           "LEFT JOIN $parameters_table AS a ON b.student_id=a.student_id ".
           "LEFT JOIN $symb_table AS c ON c.symb_id = a.symb_id ".
           "WHERE student='$student'";
       if (defined($symb) && $symb ne '') {
           $request .= " AND c.symb=".$dbh->quote($symb);
       }
       $sth = $dbh->prepare($request);
       $sth->execute();
       if ($sth->err()) {
           &Apache::lonnet::logthis("Unable to execute MySQL request:");
           &Apache::lonnet::logthis("\n".$request."\n");
           &Apache::lonnet::logthis("error is:".$sth->errstr());
           if (defined($symb) && $symb ne '') {
               $studentdata = $studentdata->{$symb};
           }
           return $studentdata;
       }
       #
       foreach my $row (@{$sth->fetchall_arrayref}) {
           $rows_retrieved++;
           my ($symb,$parameter,$value) = (@$row);
           $studentdata->{$symb}->{$parameter}  = $value;
       }
       #
       if (defined($symb) && $symb ne '') {
           $studentdata = $studentdata->{$symb};
     }      }
     return $studentdata;      return $studentdata;
 }  }
Line 1128  sub get_current_state { Line 1244  sub get_current_state {
     return () if (! defined($sname) || ! defined($sdom));      return () if (! defined($sname) || ! defined($sdom));
     #      #
     my ($status,$data) = &ensure_current_data($sname,$sdom,$courseid);      my ($status,$data) = &ensure_current_data($sname,$sdom,$courseid);
     #  #    &Apache::lonnet::logthis
     if (defined($data)) {  #        ('sname = '.$sname.
   #         ' domain = '.$sdom.
   #         ' status = '.$status.
   #         ' data is '.(defined($data)?'defined':'undefined'));
   #    while (my ($symb,$hash) = each(%$data)) {
   #        &Apache::lonnet::logthis($symb."\n----------------------------------");
   #        while (my ($key,$value) = each (%$hash)) {
   #            &Apache::lonnet::logthis("   ".$key." = ".$value);
   #        }
   #    }
       #
       if (defined($data) && defined($symb) && ref($data->{$symb})) {
           return %{$data->{$symb}};
       } elsif (defined($data) && ! defined($symb) && ref($data)) {
         return %$data;          return %$data;
     } elsif ($status eq 'no data') {      } 
       if ($status eq 'no data') {
         return ();          return ();
     } else {      } else {
         if ($status ne 'okay' && $status ne '') {          if ($status ne 'okay' && $status ne '') {
Line 1159  the students you are concerned with prio Line 1289  the students you are concerned with prio
   
 Inputs: $students, $symb, $part, $courseid  Inputs: $students, $symb, $part, $courseid
   
   =over 4
   
   =item $students is an array of hash references.  
   Each hash must contain at least the 'username' and 'domain' of a student.
   
   =item $symb is the symb for the problem.
   
   =item $part is the part id you need statistics for
   
   =item $courseid is the course id, of course!
   
   =back
   
   Outputs: See the code for up to date information.  A hash reference is
   returned.  The hash has the following keys defined:
   
   =over 4
   
   =item num_students The number of students attempting the problem
         
   =item tries The total number of tries for the students
         
   =item max_tries The maximum number of tries taken
         
   =item mean_tries The average number of tries
         
   =item num_solved The number of students able to solve the problem
         
   =item num_override The number of students whose answer is 'correct_by_override'
         
   =item deg_of_diff The degree of difficulty of the problem
         
   =item std_tries The standard deviation of the number of tries
         
   =item skew_tries The skew of the number of tries
   
   =item per_wrong The number of students attempting the problem who were not
   able to answer it correctly.
   
   =back
   
 =cut  =cut
   
 ################################################  ################################################
Line 1172  sub get_problem_statistics { Line 1343  sub get_problem_statistics {
     my $part_id = &get_part_id($part);      my $part_id = &get_part_id($part);
     my $stats_table = $courseid.'_problem_stats';      my $stats_table = $courseid.'_problem_stats';
     #      #
     &Apache::lonnet::logthis('symb id = '.$symb_id);  
     &Apache::lonnet::logthis('part id = '.$part_id);  
   
     my $dbh = &Apache::lonmysql::get_dbh();      my $dbh = &Apache::lonmysql::get_dbh();
     return undef if (! defined($dbh));      return undef if (! defined($dbh));
     &Apache::lonnet::logthis('dbh is defined');  
     #      #
     # A) Number of Students attempting problem      # A) Number of Students attempting problem
     # B) Total number of tries of students attempting problem      # B) Total number of tries of students attempting problem
Line 1195  sub get_problem_statistics { Line 1362  sub get_problem_statistics {
         'CREATE TEMPORARY TABLE '.$stats_table.          'CREATE TEMPORARY TABLE '.$stats_table.
             ' SELECT student_id,solved,award,tries FROM '.$performance_table.              ' SELECT student_id,solved,award,tries FROM '.$performance_table.
                 ' WHERE symb_id='.$symb_id.' AND part_id='.$part_id;                  ' WHERE symb_id='.$symb_id.' AND part_id='.$part_id;
       if (defined($students)) {
           $request .= ' AND ('.
               join(' OR ', map {'student_id='.
                                     &get_student_id($_->{'username'},
                                                     $_->{'domain'})
                                     } @$students
                    ).')';
       }
 #    &Apache::lonnet::logthis($request);  #    &Apache::lonnet::logthis($request);
     $dbh->do($request);      $dbh->do($request);
     my ($num,$tries,$mod,$mean,$STD) = &execute_SQL_request      my ($num,$tries,$mod,$mean,$STD) = &execute_SQL_request
Line 1215  sub get_problem_statistics { Line 1390  sub get_problem_statistics {
     $solved = 0 if (! defined($solved));      $solved = 0 if (! defined($solved));
     #      #
     my $DegOfDiff = 'nan';      my $DegOfDiff = 'nan';
     $DegOfDiff = 1-($Solved + $solved)/$tries if ($tries>0);      $DegOfDiff = 1-($Solved)/$tries if ($tries>0);
   
     my $SKEW = 'nan';      my $SKEW = 'nan';
       my $wrongpercent = 0;
     if ($num > 0) {      if ($num > 0) {
         ($SKEW) = &execute_SQL_request($dbh,'SELECT SQRT(SUM('.          ($SKEW) = &execute_SQL_request($dbh,'SELECT SQRT(SUM('.
                                      'POWER(tries - '.$STD.',3)'.                                       'POWER(tries - '.$STD.',3)'.
                                      '))/'.$num.' FROM '.$stats_table);                                       '))/'.$num.' FROM '.$stats_table);
           $wrongpercent=int(10*100*($num-$Solved+$solved)/$num)/10;
     }      }
     #      #
     $dbh->do('DROP TABLE '.$stats_table);  # May return an error      $dbh->do('DROP TABLE '.$stats_table);  # May return an error
     return ($num,$tries,$mod,$mean,$Solved,$solved,$DegOfDiff,$STD,$SKEW);      #
       # Store in metadata
       #
       if ($num) {
    my %storestats=();
   
           my $urlres=(split(/\_\_\_/,$symb))[2];
   
    $storestats{$courseid.'___'.$urlres.'___timestamp'}=time;       
    $storestats{$courseid.'___'.$urlres.'___stdno'}=$num;
    $storestats{$courseid.'___'.$urlres.'___avetries'}=$mean;   
    $storestats{$courseid.'___'.$urlres.'___difficulty'}=$DegOfDiff;
   
    $urlres=~/^(\w+)\/(\w+)/; 
    &Apache::lonnet::put('nohist_resevaldata',\%storestats,$1,$2); 
       }
       #
       # Return result
       #
       return { num_students => $num,
                tries        => $tries,
                max_tries    => $mod,
                mean_tries   => $mean,
                std_tries    => $STD,
                skew_tries   => $SKEW,
                num_solved   => $Solved,
                num_override => $solved,
                per_wrong    => $wrongpercent,
                deg_of_diff  => $DegOfDiff };
 }  }
   
 sub execute_SQL_request {  sub execute_SQL_request {
Removed from v.1.61  
changed lines
  Added in v.1.81.2.1

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