--- loncom/interface/loncoursedata.pm 2003/03/21 16:04:10 1.60 +++ loncom/interface/loncoursedata.pm 2003/03/25 22:29:31 1.61 @@ -1,6 +1,6 @@ # The LearningOnline Network with CAPA # -# $Id: loncoursedata.pm,v 1.60 2003/03/21 16:04:10 matthew Exp $ +# $Id: loncoursedata.pm,v 1.61 2003/03/25 22:29:31 matthew Exp $ # # Copyright Michigan State University Board of Trustees # @@ -66,203 +66,6 @@ and/or itself. =cut -# ----- DOWNLOAD INFORMATION ------------------------------------------- - -=pod - -=item &DownloadClasslist() - -Collects lastname, generation, middlename, firstname, PID, and section for each -student from their environment database. The section data is also download, though -it is in a rough format, and is processed later. The list of students is built from -collecting a classlist for the course that is to be displayed. Once the classlist -has been downloaded, its date stamp is recorded. Unless the datestamp for the -class database is reset or is modified, this data will not be downloaded again. -Also, there was talk about putting the fullname and section -and perhaps other pieces of data into the classlist file. This would -reduce the number of different file accesses and reduce the amount of -processing on this side. - -=over 4 - -Input: $courseID, $lastDownloadTime, $c - -$courseID: The id of the course - -$lastDownloadTime: This is the date stamp for when this information was -last gathered. If it is set to Not downloaded, it will gather the data -again, though it currently does not remove the old data. - -$c: The connection class that can determine if the browser has aborted. It -is used to short circuit this function so that it does not continue to -get information when there is no need. - -Output: \%classlist - -\%classlist: A pointer to a hash containing the following data: - --A list of student name:domain (as keys) (known below as $name) - --A hash pointer for each student containing lastname, generation, firstname, -middlename, and PID : Key is $name.studentInformation - --A hash pointer to each students section data : Key is $name.section - --If there was an error in dump, it will be returned in the hash. See -the error codes for dump in lonnet. Also, an error key will be -generated if an abort occurs. - -=back - -=cut - -sub DownloadClasslist { - my ($courseID, $lastDownloadTime, $c)=@_; - my ($courseDomain,$courseNumber)=split(/\_/,$courseID); - my %classlist; - - my $modifiedTime = &Apache::lonnet::GetFileTimestamp($courseDomain, - $courseNumber, - 'classlist.db', - $Apache::lonnet::perlvar{'lonUsersDir'}); - - # Always download the information if lastDownloadTime is set to - # Not downloaded, otherwise it is only downloaded if the file - # has been updated and has a more recent date stamp - if($lastDownloadTime ne 'Not downloaded' && - $lastDownloadTime >= $modifiedTime && $modifiedTime >= 0) { - # Data is not gathered so return UpToDate as true. This - # will be interpreted in ProcessClasslist - $classlist{'lastDownloadTime'}=time; - $classlist{'UpToDate'} = 'true'; - return \%classlist; - } - - %classlist=&Apache::lonnet::dump('classlist',$courseDomain, $courseNumber); - foreach(keys (%classlist)) { - if(/^(con_lost|error|no_such_host)/i) { - return; - } - } - - foreach my $name (keys(%classlist)) { - if(defined($c) && ($c->aborted())) { - $classlist{'error'}='aborted'; - return \%classlist; - } - - my ($studentName,$studentDomain) = split(/\:/,$name); - # Download student environment data, specifically the full name and id. - my %studentInformation=&Apache::lonnet::get('environment', - ['lastname','generation', - 'firstname','middlename', - 'id'], - $studentDomain, - $studentName); - $classlist{$name.':studentInformation'}=\%studentInformation; - - if($c->aborted()) { - $classlist{'error'}='aborted'; - return \%classlist; - } - - #Section - my %section=&Apache::lonnet::dump('roles',$studentDomain,$studentName); - $classlist{$name.':sections'}=\%section; - } - - $classlist{'UpToDate'} = 'false'; - $classlist{'lastDownloadTime'}=time; - - return \%classlist; -} - -=pod - -=item &DownloadCourseInformation() - -Dump of all the course information for a single student. The data can be -pruned by making use of dumps regular expression arguement. This function -also takes a regular expression which it passes straight through to dump. -The data is no escaped, because it is done elsewhere. It also -checks the timestamp of the students course database file and only downloads -if it has been modified since the last download. - -=over 4 - -Input: $namedata, $courseID, $lastDownloadTime, $WhatIWant - -$namedata: student name:domain - -$courseID: The id of the course - -$lastDownloadTime: This is the date stamp for when this information was -last gathered. If it is set to Not downloaded, it will gather the data -again, though it currently does not remove the old data. - -$WhatIWant: Regular expression used to get selected data with dump - -Output: \%courseData - -\%courseData: A hash pointer to the raw data from the students course -database. - -=back - -=cut - -sub DownloadCourseInformation { - my ($namedata,$courseID,$lastDownloadTime,$WhatIWant)=@_; - my %courseData; - my ($name,$domain) = split(/\:/,$namedata); - - my $modifiedTime = &Apache::lonnet::GetFileTimestamp($domain, $name, - $courseID.'.db', - $Apache::lonnet::perlvar{'lonUsersDir'}); - - if($lastDownloadTime ne 'Not downloaded' && - $lastDownloadTime >= $modifiedTime && $modifiedTime >= 0) { - # Data is not gathered so return UpToDate as true. This - # will be interpreted in ProcessClasslist - $courseData{$namedata.':lastDownloadTime'}=time; - $courseData{$namedata.':UpToDate'} = 'true'; - return \%courseData; - } - - # Download course data - if(!defined($WhatIWant)) { - # set the regular expression to everything by setting it to period - $WhatIWant = '.'; - } - %courseData=&Apache::lonnet::dump($courseID, $domain, $name, $WhatIWant); - $courseData{'UpToDate'} = 'false'; - $courseData{'lastDownloadTime'}=time; - - my %newData; - foreach (keys(%courseData)) { - # need to have the keys to be prepended with the name:domain of the - # student to reduce data collision later. - $newData{$namedata.':'.$_} = $courseData{$_}; - } - - return \%newData; -} - -# ----- END DOWNLOAD INFORMATION --------------------------------------- - -=pod - -=head1 PROCESSING FUNCTIONS - -These functions process all the data for all the students. Also, they -are the functions that access the cache database for writing the majority of -the time. The downloading and caching were separated to reduce problems -with stopping downloading then can not tie hash to database later. - -=cut - -# ----- PROCESSING FUNCTIONS --------------------------------------- - #################################################### #################################################### @@ -277,9 +80,9 @@ assessment contents of each sequence in The returned structure is a hash reference. -{ title => 'title', - symb => 'symb', - source => '/s/o/u/r/c/e', +{ title => 'title', + symb => 'symb', + src => '/s/o/u/r/c/e', type => (container|assessment), num_assess => 2, # only for container parts => [11,13,15], # only for assessment @@ -301,12 +104,13 @@ sub get_sequence_assessment_data { my $fn=$ENV{'request.course.fn'}; ## ## use navmaps - my $navmap = Apache::lonnavmaps::navmap->new($fn.".db",$fn."_parms.db", - 1,0); + my $navmap = Apache::lonnavmaps::navmap->new(Apache->request,$fn.".db", + $fn."_parms.db",1,0); if (!defined($navmap)) { return 'Can not open Coursemap'; } my $iterator = $navmap->getIterator(undef, undef, undef, 1); + my $curRes = $iterator->next(); # Top level sequence ## ## Prime the pump ## @@ -333,7 +137,7 @@ sub get_sequence_assessment_data { # We need to keep track of which sequences contain homework problems # my $previous; - my $curRes = $iterator->next(); # BEGIN_MAP + $curRes = $iterator->next(); # BEGIN_MAP $curRes = $iterator->next(); # The first item in the top level map. while (scalar(@Nested_Sequences)) { $previous = $curRes; @@ -383,748 +187,6 @@ sub get_sequence_assessment_data { return ($top,\@Sequences,\@Assessments); } -################################################# -################################################# - -=pod - -=item &ProcessTopResourceMap() - -Trace through the "big hash" created in rat/lonuserstate.pm::loadmap. -Basically, this function organizes a subset of the data and stores it in -cached data. The data stored is the problems, sequences, sequence titles, -parts of problems, and their ordering. Column width information is also -partially handled here on a per sequence basis. - -=over 4 - -Input: $cache, $c - -$cache: A pointer to a hash to store the information - -$c: The connection class used to determine if an abort has been sent to the -browser - -Output: A string that contains an error message or "OK" if everything went -smoothly. - -=back - -=cut - -sub ProcessTopResourceMap { - my ($cache,$c)=@_; - my %hash; - my $fn=$ENV{'request.course.fn'}; - if(-e "$fn.db") { - my $tieTries=0; - while($tieTries < 3) { - if($c->aborted()) { - return; - } - if(tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640)) { - last; - } - $tieTries++; - sleep 1; - } - if($tieTries >= 3) { - return 'Coursemap undefined.'; - } - } else { - return 'Can not open Coursemap.'; - } - - my $oldkeys; - delete $cache->{'OptionResponses'}; - if(defined($cache->{'ResourceKeys'})) { - $oldkeys = $cache->{'ResourceKeys'}; - foreach (split(':::', $cache->{'ResourceKeys'})) { - delete $cache->{$_}; - } - delete $cache->{'ResourceKeys'}; - } - - # Initialize state machine. Set information pointing to top level map. - my (@sequences, @currentResource, @finishResource); - my ($currentSequence, $currentResourceID, $lastResourceID); - - $currentResourceID=$hash{'ids_'. - &Apache::lonnet::clutter($ENV{'request.course.uri'})}; - push(@currentResource, $currentResourceID); - $lastResourceID=-1; - $currentSequence=-1; - my $topLevelSequenceNumber = $currentSequence; - - my %sequenceRecord; - my %allkeys; - while(1) { - if($c->aborted()) { - last; - } - # HANDLE NEW SEQUENCE! - #if page || sequence - if(defined($hash{'map_pc_'.$hash{'src_'.$currentResourceID}}) && - !defined($sequenceRecord{$currentResourceID})) { - $sequenceRecord{$currentResourceID}++; - push(@sequences, $currentSequence); - push(@currentResource, $currentResourceID); - push(@finishResource, $lastResourceID); - - $currentSequence=$hash{'map_pc_'.$hash{'src_'.$currentResourceID}}; - - # Mark sequence as containing problems. If it doesn't, then - # it will be removed when processing for this sequence is - # complete. This allows the problems in a sequence - # to be outputed before problems in the subsequences - if(!defined($cache->{'orderedSequences'})) { - $cache->{'orderedSequences'}=$currentSequence; - } else { - $cache->{'orderedSequences'}.=':'.$currentSequence; - } - $allkeys{'orderedSequences'}++; - - $lastResourceID=$hash{'map_finish_'. - $hash{'src_'.$currentResourceID}}; - $currentResourceID=$hash{'map_start_'. - $hash{'src_'.$currentResourceID}}; - - if(!($currentResourceID) || !($lastResourceID)) { - $currentSequence=pop(@sequences); - $currentResourceID=pop(@currentResource); - $lastResourceID=pop(@finishResource); - if($currentSequence eq $topLevelSequenceNumber) { - last; - } - } - next; - } - - # Handle gradable resources: exams, problems, etc - $currentResourceID=~/(\d+)\.(\d+)/; - my $partA=$1; - my $partB=$2; - if($hash{'src_'.$currentResourceID}=~ - /\.(problem|exam|quiz|assess|survey|form)$/ && - $partA eq $currentSequence && - !defined($sequenceRecord{$currentSequence.':'. - $currentResourceID})) { - $sequenceRecord{$currentSequence.':'.$currentResourceID}++; - my $Problem = &Apache::lonnet::symbclean( - &Apache::lonnet::declutter($hash{'map_id_'.$partA}). - '___'.$partB.'___'. - &Apache::lonnet::declutter($hash{'src_'. - $currentResourceID})); - - $cache->{$currentResourceID.':problem'}=$Problem; - $allkeys{$currentResourceID.':problem'}++; - if(!defined($cache->{$currentSequence.':problems'})) { - $cache->{$currentSequence.':problems'}=$currentResourceID; - } else { - $cache->{$currentSequence.':problems'}.= - ':'.$currentResourceID; - } - $allkeys{$currentSequence.':problems'}++; - - my $meta=$hash{'src_'.$currentResourceID}; -# $cache->{$currentResourceID.':title'}= -# &Apache::lonnet::metdata($meta,'title'); - $cache->{$currentResourceID.':title'}= - $hash{'title_'.$currentResourceID}; - $allkeys{$currentResourceID.':title'}++; - $cache->{$currentResourceID.':source'}= - $hash{'src_'.$currentResourceID}; - $allkeys{$currentResourceID.':source'}++; - - # Get Parts for problem - my %beenHere; - foreach (split(/\,/,&Apache::lonnet::metadata($meta,'packages'))) { - if(/^\w+response_\d+.*/) { - my (undef, $partId, $responseId) = split(/_/,$_); - if($beenHere{'p:'.$partId} == 0) { - $beenHere{'p:'.$partId}++; - if(!defined($cache->{$currentSequence.':'. - $currentResourceID.':parts'})) { - $cache->{$currentSequence.':'.$currentResourceID. - ':parts'}=$partId; - } else { - $cache->{$currentSequence.':'.$currentResourceID. - ':parts'}.=':'.$partId; - } - $allkeys{$currentSequence.':'.$currentResourceID. - ':parts'}++; - } - if($beenHere{'r:'.$partId.':'.$responseId} == 0) { - $beenHere{'r:'.$partId.':'.$responseId}++; - if(!defined($cache->{$currentSequence.':'. - $currentResourceID.':'.$partId. - ':responseIDs'})) { - $cache->{$currentSequence.':'.$currentResourceID. - ':'.$partId.':responseIDs'}=$responseId; - } else { - $cache->{$currentSequence.':'.$currentResourceID. - ':'.$partId.':responseIDs'}.=':'. - $responseId; - } - $allkeys{$currentSequence.':'.$currentResourceID.':'. - $partId.':responseIDs'}++; - } - if(/^optionresponse/ && - $beenHere{'o:'.$partId.':'.$currentResourceID} == 0) { - $beenHere{'o:'.$partId.$currentResourceID}++; - if(defined($cache->{'OptionResponses'})) { - $cache->{'OptionResponses'}.= ':::'. - $currentSequence.':'.$currentResourceID.':'. - $partId.':'.$responseId; - } else { - $cache->{'OptionResponses'}= $currentSequence.':'. - $currentResourceID.':'. - $partId.':'.$responseId; - } - $allkeys{'OptionResponses'}++; - } - } - } - } - - # if resource == finish resource, then it is the end of a sequence/page - if($currentResourceID eq $lastResourceID) { - # pop off last resource of sequence - $currentResourceID=pop(@currentResource); - $lastResourceID=pop(@finishResource); - - if(defined($cache->{$currentSequence.':problems'})) { - # Capture sequence information here - $cache->{$currentSequence.':title'}= - $hash{'title_'.$currentResourceID}; - $allkeys{$currentSequence.':title'}++; - $cache->{$currentSequence.':source'}= - $hash{'src_'.$currentResourceID}; - $allkeys{$currentSequence.':source'}++; - - my $totalProblems=0; - foreach my $currentProblem (split(/\:/, - $cache->{$currentSequence. - ':problems'})) { - foreach (split(/\:/,$cache->{$currentSequence.':'. - $currentProblem. - ':parts'})) { - $totalProblems++; - } - } - my @titleLength=split(//,$cache->{$currentSequence. - ':title'}); - # $extra is 5 for problems correct and 3 for space - # between problems correct and problem output - my $extra = 8; - if(($totalProblems + $extra) > (scalar @titleLength)) { - $cache->{$currentSequence.':columnWidth'}= - $totalProblems + $extra; - } else { - $cache->{$currentSequence.':columnWidth'}= - (scalar @titleLength); - } - $allkeys{$currentSequence.':columnWidth'}++; - } else { - # Remove sequence from list, if it contains no problems to - # display. - $cache->{'orderedSequences'}=~s/$currentSequence//; - $cache->{'orderedSequences'}=~s/::/:/g; - $cache->{'orderedSequences'}=~s/^:|:$//g; - } - - $currentSequence=pop(@sequences); - if($currentSequence eq $topLevelSequenceNumber) { - last; - } - } - - # MOVE!!! - # move to next resource - unless(defined($hash{'to_'.$currentResourceID})) { - # big problem, need to handle. Next is probably wrong - my $errorMessage = 'Big problem in '; - $errorMessage .= 'loncoursedata::ProcessTopLevelMap.'; - $errorMessage .= " bighash to_$currentResourceID not defined!"; - &Apache::lonnet::logthis($errorMessage); - if (!defined($currentResourceID)) {last;} - } - my @nextResources=(); - foreach (split(/\,/,$hash{'to_'.$currentResourceID})) { - if(!defined($sequenceRecord{$currentSequence.':'. - $hash{'goesto_'.$_}})) { - push(@nextResources, $hash{'goesto_'.$_}); - } - } - push(@currentResource, @nextResources); - # Set the next resource to be processed - $currentResourceID=pop(@currentResource); - } - - my @theKeys = keys(%allkeys); - my $newkeys = join(':::', @theKeys); - $cache->{'ResourceKeys'} = join(':::', $newkeys); - if($newkeys ne $oldkeys) { - $cache->{'ResourceUpdated'} = 'true'; - } else { - $cache->{'ResourceUpdated'} = 'false'; - } - - unless (untie(%hash)) { - &Apache::lonnet::logthis("WARNING: ". - "Could not untie coursemap $fn (browse)". - "."); - } - - return 'OK'; -} - -=pod - -=item &ProcessClasslist() - -Taking the class list dumped from &DownloadClasslist(), all the -students and their non-class information is processed using the -&ProcessStudentInformation() function. A date stamp is also recorded for -when the data was processed. - -Takes data downloaded for a student and breaks it up into managable pieces and -stored in cache data. The username, domain, class related date, PID, -full name, and section are all processed here. - -=over 4 - -Input: $cache, $classlist, $courseID, $ChartDB, $c - -$cache: A hash pointer to store the data - -$classlist: The hash of data collected about a student from -&DownloadClasslist(). The hash contains a list of students, a pointer -to a hash of student information for each student, and each students section -number. - -$courseID: The course ID - -$ChartDB: The name of the cache database file. - -$c: The connection class used to determine if an abort has been sent to the -browser - -Output: @names - -@names: An array of students whose information has been processed, and are to -be considered in an arbitrary order. The entries in @names are of the form -username:domain. - -The values in $cache are as follows: - - *NOTE: for the following $name implies username:domain - $name.':error' only defined if an error occured. Value - contains the error message - $name.':lastDownloadTime' unconverted time of the last update of a - student\'s course data - $name.'updateTime' coverted time of the last update of a - student\'s course data - $name.':username' username of a student - $name.':domain' domain of a student - $name.':fullname' full name of a student - $name.':id' PID of a student - $name.':Status' active/expired status of a student - $name.':section' section of a student - -=back - -=cut - -sub ProcessClasslist { - my ($cache,$classlist,$courseID,$c)=@_; - my @names=(); - - $cache->{'ClasslistTimeStamp'}=$classlist->{'lastDownloadTime'}; - if($classlist->{'UpToDate'} eq 'true') { - return split(/:::/,$cache->{'NamesOfStudents'});; - } - - foreach my $name (keys(%$classlist)) { - if($name =~ /\:section/ || $name =~ /\:studentInformation/ || - $name eq '' || $name eq 'UpToDate' || $name eq 'lastDownloadTime') { - next; - } - if($c->aborted()) { - return (); - } - my $studentInformation = $classlist->{$name.':studentInformation'}; - my $date = $classlist->{$name}; - my ($studentName,$studentDomain) = split(/\:/,$name); - - $cache->{$name.':username'}=$studentName; - $cache->{$name.':domain'}=$studentDomain; - # Initialize timestamp for student - if(!defined($cache->{$name.':lastDownloadTime'})) { - $cache->{$name.':lastDownloadTime'}='Not downloaded'; - $cache->{$name.':updateTime'}=' Not updated'; - } - - my $error = 0; - foreach(keys(%$studentInformation)) { - if(/^(con_lost|error|no_such_host)/i) { - $cache->{$name.':error'}= - 'Could not download student environment data.'; - $cache->{$name.':fullname'}=''; - $cache->{$name.':id'}=''; - $error = 1; - } - } - next if($error); - push(@names,$name); - $cache->{$name.':fullname'}=&ProcessFullName( - $studentInformation->{'lastname'}, - $studentInformation->{'generation'}, - $studentInformation->{'firstname'}, - $studentInformation->{'middlename'}); - $cache->{$name.':id'}=$studentInformation->{'id'}; - - my ($end, $start)=split(':',$date); - $courseID=~s/\_/\//g; - $courseID=~s/^(\w)/\/$1/; - - my $sec=''; - my $sectionData = $classlist->{$name.':sections'}; - foreach my $key (keys (%$sectionData)) { - my $value = $sectionData->{$key}; - if ($key=~/^$courseID(?:\/)*(\w+)*\_st$/) { - my $tempsection=$1; - if($key eq $courseID.'_st') { - $tempsection=''; - } - my (undef,$roleend,$rolestart)=split(/\_/,$value); - if($roleend eq $end && $rolestart eq $start) { - $sec = $tempsection; - last; - } - } - } - - my $status='Expired'; - if(((!$end) || time < $end) && ((!$start) || (time > $start))) { - $status='Active'; - } - $cache->{$name.':Status'}=$status; - $cache->{$name.':section'}=$sec; - - if($sec eq '' || !defined($sec) || $sec eq ' ') { - $sec = 'none'; - } - if(defined($cache->{'sectionList'})) { - if($cache->{'sectionList'} !~ /(^$sec:|^$sec$|:$sec$|:$sec:)/) { - $cache->{'sectionList'} .= ':'.$sec; - } - } else { - $cache->{'sectionList'} = $sec; - } - } - - $cache->{'ClasslistTimestamp'}=time; - $cache->{'NamesOfStudents'}=join(':::',@names); - - return @names; -} - -=pod - -=item &ProcessStudentData() - -Takes the course data downloaded for a student in -&DownloadCourseInformation() and breaks it up into key value pairs -to be stored in the cached data. The keys are comprised of the -$username:$domain:$keyFromCourseDatabase. The student username:domain is -stored away signifying that the students information has been downloaded and -can be reused from cached data. - -=over 4 - -Input: $cache, $courseData, $name - -$cache: A hash pointer to store data - -$courseData: A hash pointer that points to the course data downloaded for a -student. - -$name: username:domain - -Output: None - -*NOTE: There is no output, but an error message is stored away in the cache -data. This is checked in &FormatStudentData(). The key username:domain:error -will only exist if an error occured. The error is an error from -&DownloadCourseInformation(). - -=back - -=cut - -sub ProcessStudentData { - my ($cache,$courseData,$name)=@_; - - if(!&CheckDateStampError($courseData, $cache, $name)) { - return; - } - - # This little delete thing, should not be here. Move some other - # time though. - if(defined($cache->{$name.':keys'})) { - foreach (split(':::', $cache->{$name.':keys'})) { - delete $cache->{$name.':'.$_}; - } - delete $cache->{$name.':keys'}; - } - - my %courseKeys; - # user name:domain was prepended earlier in DownloadCourseInformation - foreach (keys %$courseData) { - my $currentKey = $_; - $currentKey =~ s/^$name//; - $courseKeys{$currentKey}++; - $cache->{$_}=$courseData->{$_}; - } - - $cache->{$name.':keys'} = join(':::', keys(%courseKeys)); - - return; -} - -=pod - -=item &ExtractStudentData() - -HISTORY: This function originally existed in every statistics module, -and performed different tasks, the had some overlap. Due to the need -for the data from the different modules, they were combined into -a single function. - -This function now extracts all the necessary course data for a student -from what was downloaded from their homeserver. There is some extra -time overhead compared to the ProcessStudentInformation function, but -it would have had to occurred at some point anyways. This is now -typically called while downloading the data it will process. It is -the brother function to ProcessStudentInformation. - -=over 4 - -Input: $input, $output, $data, $name - -$input: A hash that contains the input data to be processed - -$output: A hash to contain the processed data - -$data: A hash containing the information on what is to be -processed and how (basically). - -$name: username:domain - -The input is slightly different here, but is quite simple. -It is currently used where the $input, $output, and $data -can and are often the same hashes, but they do not need -to be. - -Output: None - -*NOTE: There is no output, but an error message is stored away in the cache -data. This is checked in &FormatStudentData(). The key username:domain:error -will only exist if an error occured. The error is an error from -&DownloadCourseInformation(). - -=back - -=cut - -sub ExtractStudentData { - my ($input, $output, $data, $name)=@_; - - if(!&CheckDateStampError($input, $data, $name)) { - return; - } - - # This little delete thing, should not be here. Move some other - # time though. - my %allkeys; - if(defined($output->{$name.':keys'})) { - foreach (split(':::', $output->{$name.':keys'})) { - delete $output->{$name.':'.$_}; - } - delete $output->{$name.':keys'}; - } - - my ($username,$domain)=split(':',$name); - - my $Version; - my $problemsCorrect = 0; - my $totalProblems = 0; - my $problemsSolved = 0; - my $numberOfParts = 0; - my $totalAwarded = 0; - foreach my $sequence (split(':', $data->{'orderedSequences'})) { - foreach my $problemID (split(':', $data->{$sequence.':problems'})) { - my $problem = $data->{$problemID.':problem'}; - my $LatestVersion = $input->{$name.':version:'.$problem}; - - # Output dashes for all the parts of this problem if there - # is no version information about the current problem. - $output->{$name.':'.$problemID.':NoVersion'} = 'false'; - $allkeys{$name.':'.$problemID.':NoVersion'}++; - if(!$LatestVersion) { - foreach my $part (split(/\:/,$data->{$sequence.':'. - $problemID. - ':parts'})) { - $output->{$name.':'.$problemID.':'.$part.':tries'} = 0; - $output->{$name.':'.$problemID.':'.$part.':awarded'} = 0; - $output->{$name.':'.$problemID.':'.$part.':code'} = ' '; - $allkeys{$name.':'.$problemID.':'.$part.':tries'}++; - $allkeys{$name.':'.$problemID.':'.$part.':awarded'}++; - $allkeys{$name.':'.$problemID.':'.$part.':code'}++; - $totalProblems++; - } - $output->{$name.':'.$problemID.':NoVersion'} = 'true'; - next; - } - - my %partData=undef; - # Initialize part data, display skips correctly - # Skip refers to when a student made no submissions on that - # part/problem. - foreach my $part (split(/\:/,$data->{$sequence.':'. - $problemID. - ':parts'})) { - $partData{$part.':tries'}=0; - $partData{$part.':code'}=' '; - $partData{$part.':awarded'}=0; - $partData{$part.':timestamp'}=0; - foreach my $response (split(':', $data->{$sequence.':'. - $problemID.':'. - $part.':responseIDs'})) { - $partData{$part.':'.$response.':submission'}=''; - } - } - - # Looping through all the versions of each part, starting with the - # oldest version. Basically, it gets the most recent - # set of grade data for each part. - my @submissions = (); - for(my $Version=1; $Version<=$LatestVersion; $Version++) { - foreach my $part (split(/\:/,$data->{$sequence.':'. - $problemID. - ':parts'})) { - - if(!defined($input->{"$name:$Version:$problem". - ":resource.$part.solved"})) { - # No grade for this submission, so skip - next; - } - - my $tries=0; - my $code=' '; - my $awarded=0; - - $tries = $input->{$name.':'.$Version.':'.$problem. - ':resource.'.$part.'.tries'}; - $awarded = $input->{$name.':'.$Version.':'.$problem. - ':resource.'.$part.'.awarded'}; - - $partData{$part.':awarded'}=($awarded) ? $awarded : 0; - $partData{$part.':tries'}=($tries) ? $tries : 0; - - $partData{$part.':timestamp'}=$input->{$name.':'.$Version.':'. - $problem. - ':timestamp'}; - if(!$input->{$name.':'.$Version.':'.$problem.':resource.'.$part. - '.previous'}) { - foreach my $response (split(':', - $data->{$sequence.':'. - $problemID.':'. - $part.':responseIDs'})) { - @submissions=($input->{$name.':'.$Version.':'. - $problem. - ':resource.'.$part.'.'. - $response.'.submission'}, - @submissions); - } - } - - my $val = $input->{$name.':'.$Version.':'.$problem. - ':resource.'.$part.'.solved'}; - if ($val eq 'correct_by_student') {$code = '*';} - elsif ($val eq 'correct_by_override') {$code = '+';} - elsif ($val eq 'incorrect_attempted') {$code = '.';} - elsif ($val eq 'incorrect_by_override'){$code = '-';} - elsif ($val eq 'excused') {$code = 'x';} - elsif ($val eq 'ungraded_attempted') {$code = '#';} - else {$code = ' ';} - $partData{$part.':code'}=$code; - } - } - - foreach my $part (split(/\:/,$data->{$sequence.':'.$problemID. - ':parts'})) { - $output->{$name.':'.$problemID.':'.$part.':wrong'} = - $partData{$part.':tries'}; - $allkeys{$name.':'.$problemID.':'.$part.':wrong'}++; - - if($partData{$part.':code'} eq '*') { - $output->{$name.':'.$problemID.':'.$part.':wrong'}--; - $problemsCorrect++; - } elsif($partData{$part.':code'} eq '+') { - $output->{$name.':'.$problemID.':'.$part.':wrong'}--; - $problemsCorrect++; - } - - $output->{$name.':'.$problemID.':'.$part.':tries'} = - $partData{$part.':tries'}; - $output->{$name.':'.$problemID.':'.$part.':code'} = - $partData{$part.':code'}; - $output->{$name.':'.$problemID.':'.$part.':awarded'} = - $partData{$part.':awarded'}; - $allkeys{$name.':'.$problemID.':'.$part.':tries'}++; - $allkeys{$name.':'.$problemID.':'.$part.':code'}++; - $allkeys{$name.':'.$problemID.':'.$part.':awarded'}++; - - $totalAwarded += $partData{$part.':awarded'}; - $output->{$name.':'.$problemID.':'.$part.':timestamp'} = - $partData{$part.':timestamp'}; - $allkeys{$name.':'.$problemID.':'.$part.':timestamp'}++; - - foreach my $response (split(':', $data->{$sequence.':'. - $problemID.':'. - $part.':responseIDs'})) { - $output->{$name.':'.$problemID.':'.$part.':'.$response. - ':submission'}=join(':::',@submissions); - $allkeys{$name.':'.$problemID.':'.$part.':'.$response. - ':submission'}++; - } - - if($partData{$part.':code'} ne 'x') { - $totalProblems++; - } - } - } - - $output->{$name.':'.$sequence.':problemsCorrect'} = $problemsCorrect; - $allkeys{$name.':'.$sequence.':problemsCorrect'}++; - $problemsSolved += $problemsCorrect; - $problemsCorrect=0; - } - - $output->{$name.':problemsSolved'} = $problemsSolved; - $output->{$name.':totalProblems'} = $totalProblems; - $output->{$name.':totalAwarded'} = $totalAwarded; - $allkeys{$name.':problemsSolved'}++; - $allkeys{$name.':totalProblems'}++; - $allkeys{$name.':totalAwarded'}++; - - $output->{$name.':keys'} = join(':::', keys(%allkeys)); - - return; -} - sub LoadDiscussion { my ($courseID)=@_; my %Discuss=(); @@ -1149,54 +211,6 @@ sub LoadDiscussion { return \%Discuss; } -# ----- END PROCESSING FUNCTIONS --------------------------------------- - -=pod - -=head1 HELPER FUNCTIONS - -These are just a couple of functions do various odd and end -jobs. There was also a couple of bulk functions added. These are -&DownloadStudentCourseData(), &DownloadStudentCourseDataSeparate(), and -&CheckForResidualDownload(). These functions now act as the interface -for downloading student course data. The statistical modules should -no longer make the calls to dump and download and process etc. They -make calls to these bulk functions to get their data. - -=cut - -# ----- HELPER FUNCTIONS ----------------------------------------------- - -sub CheckDateStampError { - my ($courseData, $cache, $name)=@_; - if($courseData->{$name.':UpToDate'} eq 'true') { - $cache->{$name.':lastDownloadTime'} = - $courseData->{$name.':lastDownloadTime'}; - if($courseData->{$name.':lastDownloadTime'} eq 'Not downloaded') { - $cache->{$name.':updateTime'} = ' Not updated'; - } else { - $cache->{$name.':updateTime'}= - localtime($courseData->{$name.':lastDownloadTime'}); - } - return 0; - } - - $cache->{$name.':lastDownloadTime'}=$courseData->{$name.':lastDownloadTime'}; - if($courseData->{$name.':lastDownloadTime'} eq 'Not downloaded') { - $cache->{$name.':updateTime'} = ' Not updated'; - } else { - $cache->{$name.':updateTime'}= - localtime($courseData->{$name.':lastDownloadTime'}); - } - - if(defined($courseData->{$name.':error'})) { - $cache->{$name.':error'}=$courseData->{$name.':error'}; - return 0; - } - - return 1; -} - =pod =item &ProcessFullName() @@ -1232,292 +246,6 @@ sub ProcessFullName { return $Str; } -=pod - -=item &TestCacheData() - -Determine if the cache database can be accessed with a tie. It waits up to -ten seconds before returning failure. This function exists to help with -the problems with stopping the data download. When an abort occurs and the -user quickly presses a form button and httpd child is created. This -child needs to wait for the other to finish (hopefully within ten seconds). - -=over 4 - -Input: $ChartDB - -$ChartDB: The name of the cache database to be opened - -Output: -1, 0, 1 - --1: Could not tie database - 0: Use cached data - 1: New cache database created, use that. - -=back - -=cut - -sub TestCacheData { - my ($ChartDB,$isRecalculate,$totalDelay)=@_; - my $isCached=-1; - my %testData; - my $tieTries=0; - - if(!defined($totalDelay)) { - $totalDelay = 10; - } - - if ((-e "$ChartDB") && (!$isRecalculate)) { - $isCached = 1; - } else { - $isCached = 0; - } - - while($tieTries < $totalDelay) { - my $result=0; - if($isCached) { - $result=tie(%testData,'GDBM_File',$ChartDB,&GDBM_READER(),0640); - } else { - $result=tie(%testData,'GDBM_File',$ChartDB,&GDBM_NEWDB(),0640); - } - if($result) { - last; - } - $tieTries++; - sleep 1; - } - if($tieTries >= $totalDelay) { - return -1; - } - - untie(%testData); - - return $isCached; -} - -sub DownloadStudentCourseData { - my ($students,$checkDate,$cacheDB,$extract,$status,$courseID,$r,$c)=@_; - - my $title = 'LON-CAPA Statistics'; - my $heading = 'Download and Process Course Data'; - my $studentCount = scalar(@$students); - - my $WhatIWant; - $WhatIWant = '(^version:|'; - $WhatIWant .= '^\d+:.+?:(resource\.\d+\.'; - $WhatIWant .= '(solved|tries|previous|awarded|(\d+\.submission))\s*$';#' - $WhatIWant .= '|timestamp)'; - $WhatIWant .= ')'; -# $WhatIWant = '.'; - - my %prog_state; - if($status eq 'true') { - %prog_state=&Apache::lonhtmlcommon::Create_PrgWin($r, $title, - $heading,($#$students)+1); - } - - foreach (@$students) { - my %cache; - - if($c->aborted()) { return 'Aborted'; } - - if($status eq 'true') { - &Apache::lonhtmlcommon::Increment_PrgWin($r,\%prog_state, - 'last student '.$_); - } - - my $downloadTime='Not downloaded'; - my $needUpdate = 'false'; - if($checkDate eq 'true' && - tie(%cache,'GDBM_File',$cacheDB,&GDBM_READER(),0640)) { - $downloadTime = $cache{$_.':lastDownloadTime'}; - $needUpdate = $cache{'ResourceUpdated'}; - untie(%cache); - } - - if($c->aborted()) { return 'Aborted'; } - - if($needUpdate eq 'true') { - $downloadTime = 'Not downloaded'; - } - my $courseData = - &DownloadCourseInformation($_, $courseID, $downloadTime, - $WhatIWant); - if(tie(%cache,'GDBM_File',$cacheDB,&GDBM_WRCREAT(),0640)) { - foreach my $key (keys(%$courseData)) { - if($key =~ /^(con_lost|error|no_such_host)/i) { - $courseData->{$_.':error'} = 'No course data for '.$_; - last; - } - } - if($extract eq 'true') { - &ExtractStudentData($courseData, \%cache, \%cache, $_); - } else { - &ProcessStudentData(\%cache, $courseData, $_); - } - untie(%cache); - } else { - next; - } - } - if($status eq 'true') { &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state); } - - return 'OK'; -} - -sub DownloadStudentCourseDataSeparate { - my ($students,$checkDate,$cacheDB,$extract,$status,$courseID,$r,$c)=@_; - my $residualFile = $Apache::lonnet::tmpdir.$courseID.'DownloadFile.db'; - my $title = 'LON-CAPA Statistics'; - my $heading = 'Download Course Data'; - - my $WhatIWant; - $WhatIWant = '(^version:|'; - $WhatIWant .= '^\d+:.+?:(resource\.\d+\.'; - $WhatIWant .= '(solved|tries|previous|awarded|(\d+\.submission))\s*$';#' - $WhatIWant .= '|timestamp)'; - $WhatIWant .= ')'; - - &CheckForResidualDownload($cacheDB, 'true', 'true', $courseID, $r, $c); - - my $studentCount = scalar(@$students); - my %prog_state; - if($status eq 'true') { - %prog_state=&Apache::lonhtmlcommon::Create_PrgWin($r, $title, - $heading,($#$students)+1); - } - my $displayString=''; - foreach (@$students) { - if($c->aborted()) { - return 'Aborted'; - } - - if($status eq 'true') { - &Apache::lonhtmlcommon::Increment_PrgWin($r,\%prog_state, - 'last student '.$_); - } - - my %cache; - my $downloadTime='Not downloaded'; - my $needUpdate = 'false'; - if($checkDate eq 'true' && - tie(%cache,'GDBM_File',$cacheDB,&GDBM_READER(),0640)) { - $downloadTime = $cache{$_.':lastDownloadTime'}; - $needUpdate = $cache{'ResourceUpdated'}; - untie(%cache); - } - - if($c->aborted()) { - return 'Aborted'; - } - - if($needUpdate eq 'true') { - $downloadTime = 'Not downloaded'; - } - - my $error = 0; - my $courseData = - &DownloadCourseInformation($_, $courseID, $downloadTime, - $WhatIWant); - my %downloadData; - unless(tie(%downloadData,'GDBM_File',$residualFile, - &GDBM_WRCREAT(),0640)) { - return 'Failed to tie temporary download hash.'; - } - foreach my $key (keys(%$courseData)) { - $downloadData{$key} = $courseData->{$key}; - if($key =~ /^(con_lost|error|no_such_host)/i) { - $error = 1; - last; - } - } - if($error) { - foreach my $deleteKey (keys(%$courseData)) { - delete $downloadData{$deleteKey}; - } - $downloadData{$_.':error'} = 'No course data for '.$_; - } - untie(%downloadData); - } - if($status eq 'true') { &Apache::lonhtmlcommon::Close_PrgWin($r, - \%prog_state); } - - return &CheckForResidualDownload($cacheDB, 'true', 'true', - $courseID, $r, $c); -} - -sub CheckForResidualDownload { - my ($cacheDB,$extract,$status,$courseID,$r,$c)=@_; - - my $residualFile = $Apache::lonnet::tmpdir.$courseID.'DownloadFile.db'; - if(!-e $residualFile) { - return 'OK'; - } - - my %downloadData; - my %cache; - unless(tie(%downloadData,'GDBM_File',$residualFile,&GDBM_READER(),0640)) { - return 'Can not tie database for check for residual download: tempDB'; - } - unless(tie(%cache,'GDBM_File',$cacheDB,&GDBM_WRCREAT(),0640)) { - untie(%downloadData); - return 'Can not tie database for check for residual download: cacheDB'; - } - - my @students=(); - my %checkStudent; - my $key; - while(($key, undef) = each %downloadData) { - my @temp = split(':', $key); - my $student = $temp[0].':'.$temp[1]; - if(!defined($checkStudent{$student})) { - $checkStudent{$student}++; - push(@students, $student); - } - } - - my $heading = 'Process Course Data'; - my $title = 'LON-CAPA Statistics'; - my $studentCount = scalar(@students); - my %prog_state; - if($status eq 'true') { - %prog_state=&Apache::lonhtmlcommon::Create_PrgWin($r, $title, - $heading,$#students+1); - } - - my $count=1; - foreach my $name (@students) { - last if($c->aborted()); - - if($status eq 'true') { - &Apache::lonhtmlcommon::Increment_PrgWin($r,\%prog_state, - 'last student '.$name); - } - - if($extract eq 'true') { - &ExtractStudentData(\%downloadData, \%cache, \%cache, $name); - } else { - &ProcessStudentData(\%cache, \%downloadData, $name); - } - $count++; - } - - if($status eq 'true') { &Apache::lonhtmlcommon::Close_PrgWin($r, - \%prog_state); } - - untie(%cache); - untie(%downloadData); - - if(!$c->aborted()) { - my @files = ($residualFile); - unlink(@files); - } - - return 'OK'; -} - - ################################################ ################################################ @@ -1677,56 +405,6 @@ my $parameters_table; =pod -=item &setup_table_names() - -input: course id - -output: none - -Sets the package variables for the MySQL table names: - -=over 4 - -=item $symb_table - -=item $part_table - -=item $student_table - -=item $updatetime_table - -=item $performance_table - -=item $parameters_table - -=back - -=cut - -################################################ -################################################ -sub setup_table_names { - my $courseid = shift; - if (! defined($courseid)) { - $courseid = $ENV{'request.course.id'}; - } - # - # Set up database names - my $base_id = $courseid; - $symb_table = $base_id.'_'.'symb'; - $part_table = $base_id.'_'.'part'; - $student_table = $base_id.'_'.'student'; - $updatetime_table = $base_id.'_'.'updatetime'; - $performance_table = $base_id.'_'.'performance'; - $parameters_table = $base_id.'_'.'parameters'; - return; -} - -################################################ -################################################ - -=pod - =item &init_dbs() Input: course id @@ -1926,11 +604,20 @@ Output: undef on error, $part string on ################################################ ################################################ +my $have_read_part_table = 0; my %ids_by_part; my %parts_by_id; sub get_part_id { my ($part) = @_; + $part = 0 if (! defined($part)); + if (! $have_read_part_table) { + my @Result = &Apache::lonmysql::get_rows($part_table); + foreach (@Result) { + $ids_by_part{$_->[1]}=$_->[0]; + } + $have_read_part_table = 1; + } if (! exists($ids_by_part{$part})) { &Apache::lonmysql::store_row($part_table,[undef,$part]); undef(%ids_by_part); @@ -1983,11 +670,19 @@ Output: undef on error, $symb on success ################################################ ################################################ +my $have_read_symb_table = 0; my %ids_by_symb; my %symbs_by_id; sub get_symb_id { my ($symb) = @_; + if (! $have_read_symb_table) { + my @Result = &Apache::lonmysql::get_rows($symb_table); + foreach (@Result) { + $ids_by_symb{$_->[1]}=$_->[0]; + } + $have_read_symb_table = 1; + } if (! exists($ids_by_symb{$symb})) { &Apache::lonmysql::store_row($symb_table,[undef,$symb]); undef(%ids_by_symb); @@ -2040,12 +735,20 @@ Output: undef on error, string $student ################################################ ################################################ +my $have_read_student_table = 0; my %ids_by_student; my %students_by_id; sub get_student_id { my ($sname,$sdom) = @_; my $student = $sname.':'.$sdom; + if (! $have_read_student_table) { + my @Result = &Apache::lonmysql::get_rows($student_table); + foreach (@Result) { + $ids_by_student{$_->[1]}=$_->[0]; + } + $have_read_student_table = 1; + } if (! exists($ids_by_student{$student})) { &Apache::lonmysql::store_row($student_table,[undef,$student]); undef(%ids_by_student); @@ -2146,6 +849,7 @@ sub update_student_data { my $rows_stored; my $store_parameters_command = 'INSERT INTO '.$parameters_table. ' VALUES '."\n"; + my $num_parameters = 0; my $store_performance_command = 'INSERT INTO '.$performance_table. ' VALUES '."\n"; return 'error' if (! defined($dbh)); @@ -2155,12 +859,14 @@ sub update_student_data { my $symb_id = &get_symb_id($current_symb); # # Load data into the tables - while (my ($parameter,$value) = each (%$param_hash)) { + foreach my $parameter (keys(%$param_hash)) { + my $value = $param_hash->{$parameter}; my $newstring; - if ($parameter !~ /(timestamp|resource\.(.*)\.(solved|tries|awarded|award|awarddetail|previous))/) { + if ($parameter !~ /(timestamp|resource\.(.*)\.(solved|tries|awarded|award|awarddetail|previous|weight))/) { $newstring = "('".join("','", $symb_id,$student_id, $parameter,$value)."'),\n"; + $num_parameters ++; if ($newstring !~ /''/) { $store_parameters_command .= $newstring; $rows_stored++; @@ -2200,17 +906,17 @@ sub update_student_data { chop $store_performance_command; chop $store_performance_command; my $start = Time::HiRes::time; - $dbh->do($store_parameters_command); + $dbh->do($store_parameters_command) if ($num_parameters>0); if ($dbh->err()) { &Apache::lonnet::logthis(' bigass insert error:'.$dbh->errstr()); - &Apache::lonnet::logthis('command = '.$store_performance_command); + &Apache::lonnet::logthis('command = '.$store_parameters_command); $returnstatus = 'error: unable to insert parameters into database'; return $returnstatus,\%student_data; } $dbh->do($store_performance_command); if ($dbh->err()) { &Apache::lonnet::logthis(' bigass insert error:'.$dbh->errstr()); - &Apache::lonnet::logthis('command = '.$store_parameters_command); + &Apache::lonnet::logthis('command = '.$store_performance_command); $returnstatus = 'error: unable to insert performance into database'; return $returnstatus,\%student_data; } @@ -2247,6 +953,9 @@ sub ensure_current_data { my ($sname,$sdom,$courseid) = @_; my $status = 'okay'; # return value # + $courseid = $ENV{'request.course.id'} if (! defined($courseid)); + # + # Clean out package variables &setup_table_names($courseid); # # if the tables do not exist, make them @@ -2322,7 +1031,7 @@ interesting, especially if you play with sub get_student_data_from_performance_cache { my ($sname,$sdom,$symb,$courseid)=@_; my $student = $sname.':'.$sdom if (defined($sname) && defined($sdom)); - &setup_table_names(); + &setup_table_names($courseid); # # Return hash my $studentdata; @@ -2413,20 +1122,11 @@ an empty list is returned. ################################################ sub get_current_state { my ($sname,$sdom,$symb,$courseid,$forcedownload)=@_; - if ($current_course ne $courseid) { - # Clear out variables - undef(%ids_by_part); - undef(%parts_by_id); - undef(%ids_by_symb); - undef(%symbs_by_id); - undef(%ids_by_student); - undef(%students_by_id); - $current_course = $courseid; - } - return () if (! defined($sname) || ! defined($sdom)); # $courseid = $ENV{'request.course.id'} if (! defined($courseid)); # + return () if (! defined($sname) || ! defined($sdom)); + # my ($status,$data) = &ensure_current_data($sname,$sdom,$courseid); # if (defined($data)) { @@ -2446,6 +1146,151 @@ sub get_current_state { } ################################################ +################################################ + +=pod + +=item &get_problem_statistics() + +Gather data on a given problem. The database is assumed to be +populated and all local caching variables are assumed to be set +properly. This means you need to call &ensure_current_data for +the students you are concerned with prior to calling this routine. + +Inputs: $students, $symb, $part, $courseid + +=cut + +################################################ +################################################ +sub get_problem_statistics { + my ($students,$symb,$part,$courseid) = @_; + return if (! defined($symb) || ! defined($part)); + $courseid = $ENV{'request.course.id'} if (! defined($courseid)); + # + my $symb_id = &get_symb_id($symb); + my $part_id = &get_part_id($part); + my $stats_table = $courseid.'_problem_stats'; + # + &Apache::lonnet::logthis('symb id = '.$symb_id); + &Apache::lonnet::logthis('part id = '.$part_id); + + my $dbh = &Apache::lonmysql::get_dbh(); + return undef if (! defined($dbh)); + &Apache::lonnet::logthis('dbh is defined'); + # + # A) Number of Students attempting problem + # B) Total number of tries of students attempting problem + # C) Mod (largest number of tries for solving the problem) + # D) Mean (average number of tries for solving the problem) + # E) Number of students to solve the problem + # F) Number of students to solve the problem by override + # G) Number of students unable to solve the problem + # H) Degree of difficulty : 1-(E+F)/B + # I) Standard deviation of number of tries + # J) Skew of tries: sqrt(sum(Xi-D)^3)/A + # + $dbh->do('DROP TABLE '.$stats_table); # May return an error + my $request = + 'CREATE TEMPORARY TABLE '.$stats_table. + ' SELECT student_id,solved,award,tries FROM '.$performance_table. + ' WHERE symb_id='.$symb_id.' AND part_id='.$part_id; +# &Apache::lonnet::logthis($request); + $dbh->do($request); + my ($num,$tries,$mod,$mean,$STD) = &execute_SQL_request + ($dbh, + 'SELECT COUNT(*),SUM(tries),MAX(tries),AVG(tries),STD(tries) FROM '. + $stats_table); + my ($Solved) = &execute_SQL_request($dbh,'SELECT COUNT(tries) FROM '. + $stats_table. + " WHERE solved='correct_by_student'"); + my ($solved) = &execute_SQL_request($dbh,'SELECT COUNT(tries) FROM '. + $stats_table. + " WHERE solved='correct_by_override'"); + $num = 0 if (! defined($num)); + $tries = 0 if (! defined($tries)); + $mod = 0 if (! defined($mod)); + $STD = 0 if (! defined($STD)); + $Solved = 0 if (! defined($Solved)); + $solved = 0 if (! defined($solved)); + # + my $DegOfDiff = 'nan'; + $DegOfDiff = 1-($Solved + $solved)/$tries if ($tries>0); + + my $SKEW = 'nan'; + if ($num > 0) { + ($SKEW) = &execute_SQL_request($dbh,'SELECT SQRT(SUM('. + 'POWER(tries - '.$STD.',3)'. + '))/'.$num.' FROM '.$stats_table); + } + # + $dbh->do('DROP TABLE '.$stats_table); # May return an error + return ($num,$tries,$mod,$mean,$Solved,$solved,$DegOfDiff,$STD,$SKEW); +} + +sub execute_SQL_request { + my ($dbh,$request)=@_; +# &Apache::lonnet::logthis($request); + my $sth = $dbh->prepare($request); + $sth->execute(); + my $row = $sth->fetchrow_arrayref(); + if (ref($row) eq 'ARRAY' && scalar(@$row)>0) { + return @$row; + } + return (); +} + + +################################################ +################################################ + +=pod + +=item &setup_table_names() + +input: course id + +output: none + +Cleans up the package variables for local caching. + +=cut + +################################################ +################################################ +sub setup_table_names { + my ($courseid) = @_; + if (! defined($courseid)) { + $courseid = $ENV{'request.course.id'}; + } + # + if (! defined($current_course) || $current_course ne $courseid) { + # Clear out variables + $have_read_part_table = 0; + undef(%ids_by_part); + undef(%parts_by_id); + $have_read_symb_table = 0; + undef(%ids_by_symb); + undef(%symbs_by_id); + $have_read_student_table = 0; + undef(%ids_by_student); + undef(%students_by_id); + # + $current_course = $courseid; + } + # + # Set up database names + my $base_id = $courseid; + $symb_table = $base_id.'_'.'symb'; + $part_table = $base_id.'_'.'part'; + $student_table = $base_id.'_'.'student'; + $updatetime_table = $base_id.'_'.'updatetime'; + $performance_table = $base_id.'_'.'performance'; + $parameters_table = $base_id.'_'.'parameters'; + return; +} + +################################################ ################################################ =pod