--- loncom/interface/loncoursedata.pm 2002/07/24 14:52:32 1.4
+++ loncom/interface/loncoursedata.pm 2003/04/21 15:12:37 1.70
@@ -1,7 +1,6 @@
# The LearningOnline Network with CAPA
-# (Publication Handler
#
-# $Id: loncoursedata.pm,v 1.4 2002/07/24 14:52:32 stredwic Exp $
+# $Id: loncoursedata.pm,v 1.70 2003/04/21 15:12:37 matthew Exp $
#
# Copyright Michigan State University Board of Trustees
#
@@ -35,12 +34,13 @@ loncoursedata
=head1 SYNOPSIS
-Set of functions that download and process student information.
+Set of functions that download and process student and course information.
=head1 PACKAGES USED
Apache::Constants qw(:common :http)
Apache::lonnet()
+ Apache::lonhtmlcommon
HTML::TokeParser
GDBM_File
@@ -51,6 +51,9 @@ package Apache::loncoursedata;
use strict;
use Apache::Constants qw(:common :http);
use Apache::lonnet();
+use Apache::lonhtmlcommon;
+use Time::HiRes;
+use Apache::lonmysql;
use HTML::TokeParser;
use GDBM_File;
@@ -58,742 +61,1435 @@ use GDBM_File;
=head1 DOWNLOAD INFORMATION
-This section contains all the files that get data from other servers
-and/or itself. There is one function that has a call to get remote
-information but isn't included here which is ProcessTopLevelMap. The
-usage was small enough to be ignored, but that portion may be moved
-here in the future.
+This section contains all the functions that get data from other servers
+and/or itself.
=cut
-# ----- DOWNLOAD INFORMATION -------------------------------------------
+####################################################
+####################################################
=pod
-=item &DownloadClasslist()
+=item &get_sequence_assessment_data()
-Collects lastname, generation, middlename, firstname, PID, and section for each
-student from their environment database. The list of students is built from
-collecting a classlist for the course that is to be displayed.
+AT THIS TIME THE USE OF THIS FUNCTION IS *NOT* RECOMMENDED
-=over 4
+Use lonnavmaps to build a data structure describing the order and
+assessment contents of each sequence in the current course.
-Input: $courseID, $c
+The returned structure is a hash reference.
-$courseID: The id of the course
+{ 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
+ response_ids => [12,14,16], # only for assessment
+ contents => [........] # only for container
+}
-$c: The connection class that can determine if the browser has aborted. It
-is used to short circuit this function so that it doesn't continue to
-get information when there is no need.
+$hash->{'contents'} is a reference to an array of hashes of the same structure.
-Output: \%classlist
+Also returned are array references to the sequences and assessments contained
+in the course.
-\%classlist: A pointer to a hash containing the following data:
--A list of student name:domain (as keys) (known below as $name)
+=cut
--A hash pointer for each student containing lastname, generation, firstname,
-middlename, and PID : Key is $name.'studentInformation'
+####################################################
+####################################################
+sub get_sequence_assessment_data {
+ my $fn=$ENV{'request.course.fn'};
+ ##
+ ## use navmaps
+ my $navmap = Apache::lonnavmaps::navmap->new($fn.".db",
+ $fn."_parms.db",1,0);
+ if (!defined($navmap)) {
+ return 'Can not open Coursemap';
+ }
+ my $iterator = $navmap->getIterator(undef, undef, undef, 1);
+ my $curRes = $iterator->next(); # Top level sequence
+ ##
+ ## Prime the pump
+ ##
+ ## We are going to loop until we run out of sequences/pages to explore for
+ ## resources. This means we have to start out with something to look
+ ## at.
+ my $title = $ENV{'course.'.$ENV{'request.course.id'}.'.description'};
+ my $symb = 'top';
+ my $src = 'not applicable';
+ #
+ my @Sequences;
+ my @Assessments;
+ my @Nested_Sequences = (); # Stack of sequences, keeps track of depth
+ my $top = { title => $title,
+ src => $src,
+ symb => $symb,
+ type => 'container',
+ num_assess => 0,
+ num_assess_parts => 0,
+ contents => [], };
+ push (@Sequences,$top);
+ push (@Nested_Sequences, $top);
+ #
+ # We need to keep track of which sequences contain homework problems
+ #
+ my $previous;
+ while (scalar(@Nested_Sequences)) {
+ $previous = $curRes;
+ $curRes = $iterator->next();
+ my $currentmap = $Nested_Sequences[-1]; # Last one on the stack
+ if ($curRes == $iterator->BEGIN_MAP()) {
+ # get the map itself, instead of BEGIN_MAP
+ $title = $previous->title();
+ $symb = $previous->symb();
+ $src = $previous->src();
+ my $newmap = { title => $title,
+ src => $src,
+ symb => $symb,
+ type => 'container',
+ num_assess => 0,
+ contents => [],
+ };
+ push (@{$currentmap->{'contents'}},$newmap); # this is permanent
+ push (@Sequences,$newmap);
+ push (@Nested_Sequences, $newmap); # this is a stack
+ next;
+ }
+ if ($curRes == $iterator->END_MAP()) {
+ pop(@Nested_Sequences);
+ next;
+ }
+ next if (! ref($curRes));
+ next if (! $curRes->is_problem());# && !$curRes->randomout);
+ # Okay, from here on out we only deal with assessments
+ $title = $curRes->title();
+ $symb = $curRes->symb();
+ $src = $curRes->src();
+ my $parts = $curRes->parts();
+ my $assessment = { title => $title,
+ src => $src,
+ symb => $symb,
+ type => 'assessment',
+ parts => $parts,
+ num_parts => scalar(@$parts),
+ };
+ push(@Assessments,$assessment);
+ push(@{$currentmap->{'contents'}},$assessment);
+ $currentmap->{'num_assess'}++;
+ $currentmap->{'num_assess_parts'}+= scalar(@$parts);
+ }
+ $navmap->untieHashes();
+ return ($top,\@Sequences,\@Assessments);
+}
--A hash pointer to each students section data : Key is $name.section
+sub LoadDiscussion {
+ my ($courseID)=@_;
+ my %Discuss=();
+ my %contrib=&Apache::lonnet::dump(
+ $courseID,
+ $ENV{'course.'.$courseID.'.domain'},
+ $ENV{'course.'.$courseID.'.num'});
+
+ #my %contrib=&DownloadCourseInformation($name, $courseID, 0);
-=back
+ foreach my $temp(keys %contrib) {
+ if ($temp=~/^version/) {
+ my $ver=$contrib{$temp};
+ my ($dummy,$prb)=split(':',$temp);
+ for (my $idx=1; $idx<=$ver; $idx++ ) {
+ my $name=$contrib{"$idx:$prb:sendername"};
+ $Discuss{"$name:$prb"}=$idx;
+ }
+ }
+ }
+
+ return \%Discuss;
+}
+
+=pod
+
+=item &ProcessFullName()
+
+Takes lastname, generation, firstname, and middlename (or some partial
+set of this data) and returns the full name version as a string. Format
+is Lastname generation, firstname middlename or a subset of this.
=cut
-sub DownloadClasslist {
- my ($courseID, $lastDownloadTime, $c)=@_;
- my ($courseDomain,$courseNumber)=split(/\_/,$courseID);
- my %classlist;
-
- my $modifiedTime = &GetFileTimestamp($courseDomain, $courseNumber,
- 'classlist.db',
- $Apache::lonnet::perlvar{'lonUsersDir'});
-
- if($lastDownloadTime ne 'Not downloaded' &&
- $lastDownloadTime >= $modifiedTime && $modifiedTime >= 0) {
- $classlist{'lastDownloadTime'}=time;
- $classlist{'UpToDate'} = 'true';
- return \%classlist;
- }
+sub ProcessFullName {
+ my ($lastname, $generation, $firstname, $middlename)=@_;
+ my $Str = '';
- %classlist=&Apache::lonnet::dump('classlist',$courseDomain, $courseNumber);
- my ($checkForError)=keys (%classlist);
- if($checkForError =~ /^(con_lost|error|no_such_host)/i) {
- return \%classlist;
+ # Strip whitespace preceeding & following name components.
+ $lastname =~ s/(\s+$|^\s+)//g;
+ $generation =~ s/(\s+$|^\s+)//g;
+ $firstname =~ s/(\s+$|^\s+)//g;
+ $middlename =~ s/(\s+$|^\s+)//g;
+
+ if($lastname ne '') {
+ $Str .= $lastname;
+ $Str .= ' '.$generation if ($generation ne '');
+ $Str .= ',';
+ $Str .= ' '.$firstname if ($firstname ne '');
+ $Str .= ' '.$middlename if ($middlename ne '');
+ } else {
+ $Str .= $firstname if ($firstname ne '');
+ $Str .= ' '.$middlename if ($middlename ne '');
+ $Str .= ' '.$generation if ($generation ne '');
}
- foreach my $name (keys(%classlist)) {
- if($c->aborted()) {
- $classlist{'error'}='aborted';
- return \%classlist;
- }
+ return $Str;
+}
- my ($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()) {
- $classlist{'error'}='aborted';
- return \%classlist;
- }
+=pod
- #Section
- my %section=&Apache::lonnet::dump('roles',$studentDomain,$studentName);
- $classlist{$name.':sections'}=\%section;
- }
+=item &make_into_hash($values);
+
+Returns a reference to a hash as described by $values. $values is
+assumed to be the result of
+ join(':',map {&Apache::lonnet::escape($_)} %orighash);
- $classlist{'UpToDate'} = 'false';
- $classlist{'lastDownloadTime'}=time;
+This is a helper function for get_current_state.
+
+=cut
- return \%classlist;
+################################################
+################################################
+sub make_into_hash {
+ my $values = shift;
+ my %tmp = map { &Apache::lonnet::unescape($_); }
+ split(':',$values);
+ return \%tmp;
}
+
+################################################
+################################################
+
=pod
-=item &DownloadCourseInformation()
+=head1 LOCAL DATA CACHING SUBROUTINES
-Dump of all the course information for a single student. There is no
-pruning of data, it is all stored in a hash and returned. It also
-checks the timestamp of the students course database file and only downloads
-if it has been modified since the last download.
+The local caching is done using MySQL. There is no fall-back implementation
+if MySQL is not running.
-=over 4
+The programmers interface is to call &get_current_state() or some other
+primary interface subroutine (described below). The internals of this
+storage system are documented here.
+
+There are six tables used to store student performance data (the results of
+a dumpcurrent). Each of these tables is created in MySQL with a name of
+$courseid_*****, where ***** is 'symb', 'part', or whatever is appropriate
+for the table. The tables and their purposes are described below.
-Input: $name, $courseID
+Some notes before we get started.
-$name: student name:domain
+Each table must have a PRIMARY KEY, which is a column or set of columns which
+will serve to uniquely identify a row of data. NULL is not allowed!
-$courseID: The id of the course
+INDEXes work best on integer data.
-Output: \%courseData
+JOIN is used to combine data from many tables into one output.
-\%courseData: A hash pointer to the raw data from the student's course
-database.
+lonmysql.pm is used for some of the interface, specifically the table creation
+calls. The inserts are done in bulk by directly calling the database handler.
+The SELECT ... JOIN statement used to retrieve the data does not have an
+interface in lonmysql.pm and I shudder at the thought of writing one.
+
+=head3 Table Descriptions
+
+=over 4
+
+=item $symb_table
+
+The symb_table has two columns. The first is a 'symb_id' and the second
+is the text name for the 'symb' (limited to 64k). The 'symb_id' is generated
+automatically by MySQL so inserts should be done on this table with an
+empty first element. This table has its PRIMARY KEY on the 'symb_id'.
+
+=item $part_table
+
+The part_table has two columns. The first is a 'part_id' and the second
+is the text name for the 'part' (limited to 100 characters). The 'part_id' is
+generated automatically by MySQL so inserts should be done on this table with
+an empty first element. This table has its PRIMARY KEY on the 'part' (100
+characters) and a KEY on 'part_id'.
+
+=item $student_table
+
+The student_table has two columns. The first is a 'student_id' and the second
+is the text description of the 'student' (typically username:domain) (less
+than 100 characters). The 'student_id' is automatically generated by MySQL.
+The use of the name 'student_id' is loaded, I know, but this ID is used ONLY
+internally to the MySQL database and is not the same as the students ID
+(stored in the students environment). This table has its PRIMARY KEY on the
+'student' (100 characters).
+
+=item $updatetime_table
+
+The updatetime_table has two columns. The first is 'student' (100 characters,
+typically username:domain). The second is 'updatetime', which is an unsigned
+integer, NOT a MySQL date. This table has its PRIMARY KEY on 'student' (100
+characters).
+
+=item $performance_table
+
+The performance_table has 9 columns. The first three are 'symb_id',
+'student_id', and 'part_id'. These comprise the PRIMARY KEY for this table
+and are directly related to the $symb_table, $student_table, and $part_table
+described above. MySQL does better indexing on numeric items than text,
+so we use these three "index tables". The remaining columns are
+'solved', 'tries', 'awarded', 'award', 'awarddetail', and 'timestamp'.
+These are either the MySQL type TINYTEXT or various integers ('tries' and
+'timestamp'). This table has KEYs of 'student_id' and 'symb_id'.
+For use of this table, see the functions described below.
+
+=item $parameters_table
+
+The parameters_table holds the data that does not fit neatly into the
+performance_table. The parameters table has four columns: 'symb_id',
+'student_id', 'parameter', and 'value'. 'symb_id', 'student_id', and
+'parameter' comprise the PRIMARY KEY for this table. 'parameter' is
+limited to 255 characters. 'value' is limited to 64k characters.
=back
-=cut
+=head3 Important Subroutines
-sub DownloadCourseInformation {
- my ($namedata,$courseID,$lastDownloadTime)=@_;
- my %courseData;
- my ($name,$domain) = split(/\:/,$namedata);
+Here is a brief overview of the subroutines which are likely to be of
+interest:
- my $modifiedTime = &GetFileTimestamp($domain, $name,
- $courseID.'.db',
- $Apache::lonnet::perlvar{'lonUsersDir'});
- if($lastDownloadTime >= $modifiedTime) {
- $courseData{'lastDownloadTime'}=time;
- $courseData{'UpToDate'} = 'true';
- return \%courseData;
- }
+=over 4
- # Download course data
- %courseData=&Apache::lonnet::dump($courseID, $domain, $name);
- $courseData{'UpToDate'} = 'false';
- $courseData{'lastDownloadTime'}=time;
- return \%courseData;
-}
+=item &get_current_state(): programmers interface.
-# ----- END DOWNLOAD INFORMATION ---------------------------------------
+=item &init_dbs(): table creation
-=pod
+=item &update_student_data(): data storage calls
+
+=item &get_student_data_from_performance_cache(): data retrieval
+
+=back
-=head1 PROCESSING FUNCTIONS
+=head3 Main Documentation
-These functions process all the data for all the students. Also, they
-are the only functions that access the cache database for writing. Thus
-they are the only functions that cache data. The downloading and caching
-were separated to reduce problems with stopping downloading then can't
-tie hash to database later.
+=over 4
=cut
-# ----- PROCESSING FUNCTIONS ---------------------------------------
+################################################
+################################################
+
+################################################
+################################################
+{
+
+my $current_course ='';
+my $symb_table;
+my $part_table;
+my $student_table;
+my $updatetime_table;
+my $performance_table;
+my $parameters_table;
+
+################################################
+################################################
=pod
-=item &ProcessTopResourceMap()
+=item &init_dbs()
-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.
+Input: course id
-=over 4
+Output: 0 on success, positive integer on error
-Input: $cache, $c
+This routine issues the calls to lonmysql to create the tables used to
+store student data.
-$cache: A pointer to a hash to store the information
+=cut
-$c: The connection class used to determine if an abort has been sent to the
-browser
+################################################
+################################################
+sub init_dbs {
+ my $courseid = shift;
+ &setup_table_names($courseid);
+ #
+ # Note - changes to this table must be reflected in the code that
+ # stores the data (calls &Apache::lonmysql::store_row with this table
+ # id
+ my $symb_table_def = {
+ id => $symb_table,
+ permanent => 'no',
+ columns => [{ name => 'symb_id',
+ type => 'MEDIUMINT UNSIGNED',
+ restrictions => 'NOT NULL',
+ auto_inc => 'yes', },
+ { name => 'symb',
+ type => 'MEDIUMTEXT',
+ restrictions => 'NOT NULL'},
+ ],
+ 'PRIMARY KEY' => ['symb_id'],
+ };
+ #
+ my $part_table_def = {
+ id => $part_table,
+ permanent => 'no',
+ columns => [{ name => 'part_id',
+ type => 'MEDIUMINT UNSIGNED',
+ restrictions => 'NOT NULL',
+ auto_inc => 'yes', },
+ { name => 'part',
+ type => 'VARCHAR(100)',
+ restrictions => 'NOT NULL'},
+ ],
+ 'PRIMARY KEY' => ['part (100)'],
+ 'KEY' => [{ columns => ['part_id']},],
+ };
+ #
+ my $student_table_def = {
+ id => $student_table,
+ permanent => 'no',
+ columns => [{ name => 'student_id',
+ type => 'MEDIUMINT UNSIGNED',
+ restrictions => 'NOT NULL',
+ auto_inc => 'yes', },
+ { name => 'student',
+ type => 'VARCHAR(100)',
+ restrictions => 'NOT NULL'},
+ ],
+ 'PRIMARY KEY' => ['student (100)'],
+ 'KEY' => [{ columns => ['student_id']},],
+ };
+ #
+ my $updatetime_table_def = {
+ id => $updatetime_table,
+ permanent => 'no',
+ columns => [{ name => 'student',
+ type => 'VARCHAR(100)',
+ restrictions => 'NOT NULL UNIQUE',},
+ { name => 'updatetime',
+ type => 'INT UNSIGNED',
+ restrictions => 'NOT NULL' },
+ ],
+ 'PRIMARY KEY' => ['student (100)'],
+ };
+ #
+ my $performance_table_def = {
+ id => $performance_table,
+ permanent => 'no',
+ columns => [{ name => 'symb_id',
+ type => 'MEDIUMINT UNSIGNED',
+ restrictions => 'NOT NULL' },
+ { name => 'student_id',
+ type => 'MEDIUMINT UNSIGNED',
+ restrictions => 'NOT NULL' },
+ { name => 'part_id',
+ type => 'MEDIUMINT UNSIGNED',
+ restrictions => 'NOT NULL' },
+ { name => 'solved',
+ type => 'TINYTEXT' },
+ { name => 'tries',
+ type => 'SMALLINT UNSIGNED' },
+ { name => 'awarded',
+ type => 'TINYTEXT' },
+ { name => 'award',
+ type => 'TINYTEXT' },
+ { name => 'awarddetail',
+ type => 'TINYTEXT' },
+ { name => 'timestamp',
+ type => 'INT UNSIGNED'},
+ ],
+ 'PRIMARY KEY' => ['symb_id','student_id','part_id'],
+ 'KEY' => [{ columns=>['student_id'] },
+ { columns=>['symb_id'] },],
+ };
+ #
+ my $parameters_table_def = {
+ id => $parameters_table,
+ permanent => 'no',
+ columns => [{ name => 'symb_id',
+ type => 'MEDIUMINT UNSIGNED',
+ restrictions => 'NOT NULL' },
+ { name => 'student_id',
+ type => 'MEDIUMINT UNSIGNED',
+ restrictions => 'NOT NULL' },
+ { name => 'parameter',
+ type => 'TINYTEXT',
+ restrictions => 'NOT NULL' },
+ { name => 'value',
+ type => 'MEDIUMTEXT' },
+ ],
+ 'PRIMARY KEY' => ['symb_id','student_id','parameter (255)'],
+ };
+ #
+ # Create the tables
+ my $tableid;
+ $tableid = &Apache::lonmysql::create_table($symb_table_def);
+ if (! defined($tableid)) {
+ &Apache::lonnet::logthis("error creating symb_table: ".
+ &Apache::lonmysql::get_error());
+ return 1;
+ }
+ #
+ $tableid = &Apache::lonmysql::create_table($part_table_def);
+ if (! defined($tableid)) {
+ &Apache::lonnet::logthis("error creating part_table: ".
+ &Apache::lonmysql::get_error());
+ return 2;
+ }
+ #
+ $tableid = &Apache::lonmysql::create_table($student_table_def);
+ if (! defined($tableid)) {
+ &Apache::lonnet::logthis("error creating student_table: ".
+ &Apache::lonmysql::get_error());
+ return 3;
+ }
+ #
+ $tableid = &Apache::lonmysql::create_table($updatetime_table_def);
+ if (! defined($tableid)) {
+ &Apache::lonnet::logthis("error creating updatetime_table: ".
+ &Apache::lonmysql::get_error());
+ return 4;
+ }
+ #
+ $tableid = &Apache::lonmysql::create_table($performance_table_def);
+ if (! defined($tableid)) {
+ &Apache::lonnet::logthis("error creating preformance_table: ".
+ &Apache::lonmysql::get_error());
+ return 5;
+ }
+ #
+ $tableid = &Apache::lonmysql::create_table($parameters_table_def);
+ if (! defined($tableid)) {
+ &Apache::lonnet::logthis("error creating parameters_table: ".
+ &Apache::lonmysql::get_error());
+ return 6;
+ }
+ return 0;
+}
-Output: A string that contains an error message or "OK" if everything went
-smoothly.
+################################################
+################################################
-=back
+=pod
+
+=item &delete_caches()
=cut
-sub ProcessTopResourceMap {
- my ($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.';
+################################################
+################################################
+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: '.$dbh->errstr);
}
- } else {
- return 'Can not open Coursemap.';
}
+ return;
+}
- # Initialize state machine. Set information pointing to top level map.
- my (@sequences, @currentResource, @finishResource);
- my ($currentSequence, $currentResourceID, $lastResourceID);
-
- $currentResourceID=$hash{'ids_/res/'.$ENV{'request.course.uri'}};
- push(@currentResource, $currentResourceID);
- $lastResourceID=-1;
- $currentSequence=-1;
- my $topLevelSequenceNumber = $currentSequence;
-
- while(1) {
- if($c->aborted()) {
- last;
- }
- # HANDLE NEW SEQUENCE!
- #if page || sequence
- if(defined($hash{'map_pc_'.$hash{'src_'.$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;
- }
+################################################
+################################################
- $lastResourceID=$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;
- }
- }
- }
+=pod
- # 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) {
- my $Problem = &Apache::lonnet::symbclean(
- &Apache::lonnet::declutter($hash{'map_id_'.$partA}).
- '___'.$partB.'___'.
- &Apache::lonnet::declutter($hash{'src_'.
- $currentResourceID}));
-
- $cache->{$currentResourceID.':problem'}=$Problem;
- if(!defined($cache->{$currentSequence.':problems'})) {
- $cache->{$currentSequence.':problems'}=$currentResourceID;
- } else {
- $cache->{$currentSequence.':problems'}.=
- ':'.$currentResourceID;
- }
+=item &get_part_id()
- my $meta=$hash{'src_'.$currentResourceID};
-# $cache->{$currentResourceID.':title'}=
-# &Apache::lonnet::metdata($meta,'title');
- $cache->{$currentResourceID.':title'}=
- $hash{'title_'.$currentResourceID};
-
- # Get Parts for problem
- foreach (split(/\,/,&Apache::lonnet::metadata($meta,'keys'))) {
- if($_=~/^stores\_(\d+)\_tries$/) {
- my $Part=&Apache::lonnet::metadata($meta,$_.'.part');
- if(!defined($cache->{$currentSequence.':'.
- $currentResourceID.':parts'})) {
- $cache->{$currentSequence.':'.$currentResourceID.
- ':parts'}=$Part;
- } else {
- $cache->{$currentSequence.':'.$currentResourceID.
- ':parts'}.=':'.$Part;
- }
- foreach (split(/\,/,
- &Apache::lonnet::metadata($meta,'packages'))) {
- if($_=~/^optionresponse\_($Part)\_(\w+)$/) {
- if(defined($cache->{'OptionResponses'})) {
- $cache->{'OptionResponses'}.= ':::'.
- $hash{'src_'.$currentResourceID}.'::'.
- $hash{'title_'.$currentResourceID}.'::'.
- $Part.'::'.$Problem;
- } else {
- $cache->{'OptionResponses'}=
- $hash{'src_'.$currentResourceID}.'::'.
- $hash{'title_'.$currentResourceID}.'::'.
- $Part.'::'.$Problem;
- }
- }
- }
- }
- }
- }
+Get the MySQL id of a problem part string.
- # 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};
- $cache->{$currentSequence.':source'}=
- $hash{'src_'.$currentResourceID};
-
- 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 3 for problems correct and 3 for space
- # between problems correct and problem output
- my $extra = 6;
- if(($totalProblems + $extra) > (scalar @titleLength)) {
- $cache->{$currentSequence.':columnWidth'}=
- $totalProblems + $extra;
- } else {
- $cache->{$currentSequence.':columnWidth'}=
- (scalar @titleLength);
- }
- } else {
- # Remove sequence from list, if it contains no problems to
- # display.
- $cache->{'orderedSequences'}=~s/$currentSequence//;
- $cache->{'orderedSequences'}=~s/::/:/g;
- $cache->{'orderedSequences'}=~s/^:|:$//g;
- }
+Input: $part
- $currentSequence=pop(@sequences);
- if($currentSequence eq $topLevelSequenceNumber) {
- last;
- }
- }
+Output: undef on error, integer $part_id on success.
- # MOVE!!!
- # move to next resource
- unless(defined($hash{'to_'.$currentResourceID})) {
- # big problem, need to handle. Next is probably wrong
- last;
- }
- my @nextResources=();
- foreach (split(/\,/,$hash{'to_'.$currentResourceID})) {
- push(@nextResources, $hash{'goesto_'.$_});
- }
- push(@currentResource, @nextResources);
- # Set the next resource to be processed
- $currentResourceID=pop(@currentResource);
- }
+=item &get_part()
- unless (untie(%hash)) {
- &Apache::lonnet::logthis("WARNING: ".
- "Could not untie coursemap $fn (browse)".
- ".");
- }
+Get the string describing a part from the MySQL id of the problem part.
- return 'OK';
-}
+Input: $part_id
-=pod
+Output: undef on error, $part string on success.
-=item &ProcessClasslist()
+=cut
-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.
+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,$part]);
+ undef(%ids_by_part);
+ my @Result = &Apache::lonmysql::get_rows($part_table);
+ foreach (@Result) {
+ $ids_by_part{$_->[1]}=$_->[0];
+ }
+ }
+ return $ids_by_part{$part} if (exists($ids_by_part{$part}));
+ return undef; # error
+}
+sub get_part {
+ my ($part_id) = @_;
+ if (! exists($parts_by_id{$part_id}) ||
+ ! defined($parts_by_id{$part_id}) ||
+ $parts_by_id{$part_id} eq '') {
+ my @Result = &Apache::lonmysql::get_rows($part_table);
+ foreach (@Result) {
+ $parts_by_id{$_->[0]}=$_->[1];
+ }
+ }
+ return $parts_by_id{$part_id} if(exists($parts_by_id{$part_id}));
+ return undef; # error
+}
-=over 4
+################################################
+################################################
-Input: $cache, $classlist, $courseID, $ChartDB, $c
+=pod
-$cache: A hash pointer to store the data
+=item &get_symb_id()
-$classlist: The hash of data collected about a student from
-&DownloadClasslist(). The hash contains a list of students, a pointer
-to a hash of student information for each student, and each student's section
-number.
+Get the MySQL id of a symb.
-$courseID: The course ID
+Input: $symb
-$ChartDB: The name of the cache database file.
+Output: undef on error, integer $symb_id on success.
-$c: The connection class used to determine if an abort has been sent to the
-browser
+=item &get_symb()
-Output: @names
+Get the symb associated with a MySQL symb_id.
-@names: An array of students whose information has been processed, and are to
-be considered in an arbitrary order.
+Input: $symb_id
-=back
+Output: undef on error, $symb on success.
=cut
-sub ProcessClasslist {
- my ($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 $have_read_symb_table = 0;
+my %ids_by_symb;
+my %symbs_by_id;
+
+sub get_symb_id {
+ my ($symb) = @_;
+ if (! $have_read_symb_table) {
+ my @Result = &Apache::lonmysql::get_rows($symb_table);
+ foreach (@Result) {
+ $ids_by_symb{$_->[1]}=$_->[0];
}
- push(@names,$name);
- my $studentInformation = $classlist->{$name.':studentInformation'},
- my $sectionData = $classlist->{$name.':sections'},
- my $date = $classlist->{$name},
- my ($studentName,$studentDomain) = split(/\:/,$name);
-
- $cache->{$name.':username'}=$studentName;
- $cache->{$name.':domain'}=$studentDomain;
- if(!defined($cache->{$name.':lastDownloadTime'})) {
- $cache->{$name.':lastDownloadTime'}='Not downloaded';
- }
-
- my ($checkForError)=keys(%$studentInformation);
- if($checkForError =~ /^(con_lost|error|no_such_host)/i) {
- $cache->{$name.':error'}=
- 'Could not download student environment data.';
- $cache->{$name.':fullname'}='';
- $cache->{$name.':id'}='';
- } else {
- $cache->{$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='';
- foreach my $key (keys (%$sectionData)) {
- my $value = $sectionData->{$key};
- if ($key=~/^$courseID(?:\/)*(\w+)*\_st$/) {
- my $tempsection=$1;
- if($key eq $courseID.'_st') {
- $tempsection='';
- }
- my ($dummy,$roleend,$rolestart)=split(/\_/,$value);
- if($roleend eq $end && $rolestart eq $start) {
- $sec = $tempsection;
- last;
- }
- }
+ $have_read_symb_table = 1;
+ }
+ if (! exists($ids_by_symb{$symb})) {
+ &Apache::lonmysql::store_row($symb_table,[undef,$symb]);
+ undef(%ids_by_symb);
+ my @Result = &Apache::lonmysql::get_rows($symb_table);
+ foreach (@Result) {
+ $ids_by_symb{$_->[1]}=$_->[0];
}
+ }
+ return $ids_by_symb{$symb} if(exists( $ids_by_symb{$symb}));
+ return undef; # error
+}
- my $status='Expired';
- if(((!$end) || time < $end) && ((!$start) || (time > $start))) {
- $status='Active';
+sub get_symb {
+ my ($symb_id) = @_;
+ if (! exists($symbs_by_id{$symb_id}) ||
+ ! defined($symbs_by_id{$symb_id}) ||
+ $symbs_by_id{$symb_id} eq '') {
+ my @Result = &Apache::lonmysql::get_rows($symb_table);
+ foreach (@Result) {
+ $symbs_by_id{$_->[0]}=$_->[1];
}
- $cache->{$name.':Status'}=$status;
- $cache->{$name.':section'}=$sec;
}
-
- $cache->{'ClasslistTimestamp'}=time;
- $cache->{'NamesOfStudents'}=join(':::',@names);
-
- return @names;
+ return $symbs_by_id{$symb_id} if(exists( $symbs_by_id{$symb_id}));
+ return undef; # error
}
-=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 student's information has been downloaded and
-can be reused from cached data.
+=pod
-=over 4
+=item &get_student_id()
-Input: $cache, $courseData, $name
+Get the MySQL id of a student.
-$cache: A hash pointer to store data
+Input: $sname, $dom
-$courseData: A hash pointer that points to the course data downloaded for a
-student.
+Output: undef on error, integer $student_id on success.
-$name: username:domain
+=item &get_student()
-Output: None
+Get student username:domain associated with the MySQL student_id.
-*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().
+Input: $student_id
-=back
+Output: undef on error, string $student (username:domain) on success.
=cut
-sub ProcessStudentData {
- my ($cache,$courseData,$name)=@_;
+################################################
+################################################
- if($courseData->{'UpToDate'} eq 'true') {
- $cache->{$name.':lastDownloadTime'}=$courseData->{'lastDownloadTime'};
- return;
+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];
+ }
+ $have_read_student_table = 1;
}
-
- my @courseKeys = keys(%$courseData);
-
- foreach (@courseKeys) {
- if(/^(con_lost|error|no_such_host)/i) {
- $cache->{$name.':error'}='Could not download course data.';
- return;
+ if (! exists($ids_by_student{$student})) {
+ &Apache::lonmysql::store_row($student_table,[undef,$student]);
+ undef(%ids_by_student);
+ my @Result = &Apache::lonmysql::get_rows($student_table);
+ foreach (@Result) {
+ $ids_by_student{$_->[1]}=$_->[0];
}
}
+ return $ids_by_student{$student} if(exists( $ids_by_student{$student}));
+ return undef; # error
+}
- $cache->{$name.':lastDownloadTime'}=$courseData->{'lastDownloadTime'};
- foreach (@courseKeys) {
- $cache->{$name.':'.$_}=$courseData->{$_};
+sub get_student {
+ my ($student_id) = @_;
+ if (! exists($students_by_id{$student_id}) ||
+ ! defined($students_by_id{$student_id}) ||
+ $students_by_id{$student_id} eq '') {
+ my @Result = &Apache::lonmysql::get_rows($student_table);
+ foreach (@Result) {
+ $students_by_id{$_->[0]}=$_->[1];
+ }
}
-
- return;
+ return $students_by_id{$student_id} if(exists($students_by_id{$student_id}));
+ return undef; # error
}
-sub LoadDiscussion {
-# my $symb=shift;
-# $r->print('
$cid ... '.$symb);
-# my %contrib=&Apache::lonnet::dump('msu_2964385f9033c63msul1','msu','2964385f9033c63msul1');
- my ($name, $courseID, $Discuss)=@_;
- my %contrib=&DownloadCourseInformation($name, $courseID, 0);
-
- foreach my $temp(keys %contrib) {
- if ($temp=~/^version/) {
- my $ver=$contrib{$temp};
- my ($dummy,$prb)=split(':',$temp);
- for (my $idx=1; $idx<=$ver; $idx++ ) {
- my $name=$contrib{"$idx:$prb:sendername"};
- $Discuss->{"$name:$prb"}=$idx;
- }
- }
- }
-# $r->print('
cid='.$cid);
-# my %contrib=&Apache::lonnet::restore($symb,$cid,
-# $ENV{$cid.'.domain'},
-# $ENV{'course.'.$cid.'.num'});
+################################################
+################################################
+
+=pod
-# $Apache::lonxml::debug=1;
-# &Apache::lonhomework::showhash(%Discuss);
-# $Apache::lonxml::debug=0;
+=item &update_student_data()
+
+Input: $sname, $sdom, $courseid
+
+Output: $returnstatus, \%student_data
+
+$returnstatus is a string describing any errors that occured. 'okay' is the
+default.
+\%student_data is the data returned by a call to lonnet::currentdump.
+
+This subroutine loads a students data using lonnet::currentdump and inserts
+it into the MySQL database. The inserts are done on two tables,
+$performance_table and $parameters_table. $parameters_table holds the data
+that is not included in $performance_table. See the description of
+$performance_table elsewhere in this file. The INSERT calls are made
+directly by this subroutine, not through lonmysql because we do a 'bulk'
+insert which takes advantage of MySQLs non-SQL compliant INSERT command to
+insert multiple rows at a time. If anything has gone wrong during this
+process, $returnstatus is updated with a description of the error and
+\%student_data is returned.
+
+Notice we do not insert the data and immediately query it. This means it
+is possible for there to be data returned this first time that is not
+available the second time. CYA.
+
+=cut
+
+################################################
+################################################
+sub update_student_data {
+ my ($sname,$sdom,$courseid) = @_;
+ #
+ # Set up database names
+ &setup_table_names($courseid);
+ #
+ my $student_id = &get_student_id($sname,$sdom);
+ my $student = $sname.':'.$sdom;
+ #
+ my $returnstatus = 'okay';
+ #
+ # Download students data
+ my $time_of_retrieval = time;
+ my @tmp = &Apache::lonnet::currentdump($courseid,$sdom,$sname);
+ if ((scalar(@tmp) > 0) && ($tmp[0] =~ /^error:/)) {
+ &Apache::lonnet::logthis('error getting data for '.
+ $sname.':'.$sdom.' in course '.$courseid.
+ ':'.$tmp[0]);
+ $returnstatus = 'error getting data';
+ return $returnstatus;
+ }
+ if (scalar(@tmp) < 1) {
+ return ('no data',undef);
+ }
+ my %student_data = @tmp;
+ #
+ # Remove all of the students data from the table
+ my $dbh = &Apache::lonmysql::get_dbh();
+ $dbh->do('DELETE FROM '.$performance_table.' WHERE student_id='.
+ $student_id);
+ $dbh->do('DELETE FROM '.$parameters_table.' WHERE student_id='.
+ $student_id);
+ #
+ # Store away the data
+ #
+ my $starttime = Time::HiRes::time;
+ my $elapsed = 0;
+ 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($dbh));
+ while (my ($current_symb,$param_hash) = each(%student_data)) {
+ #
+ # make sure the symb is set up properly
+ my $symb_id = &get_symb_id($current_symb);
+ #
+ # Load data into the tables
+ while (my ($parameter,$value) = each(%$param_hash)) {
+ my $newstring;
+ if ($parameter !~ /(timestamp|resource\.(.*)\.(solved|tries|awarded|award|awarddetail|previous))/) {
+ $newstring = "('".join("','",
+ $symb_id,$student_id,
+ $parameter)."',".
+ $dbh->quote($value)."),\n";
+ $num_parameters ++;
+ if ($newstring !~ /''/) {
+ $store_parameters_command .= $newstring;
+ $rows_stored++;
+ }
+ }
+ next if ($parameter !~ /^resource\.(.*)\.solved$/);
+ #
+ my $part = $1;
+ my $part_id = &get_part_id($part);
+ next if (!defined($part_id));
+ my $solved = $value;
+ my $tries = $param_hash->{'resource.'.$part.'.tries'};
+ my $awarded = $param_hash->{'resource.'.$part.'.awarded'};
+ my $award = $param_hash->{'resource.'.$part.'.award'};
+ my $awarddetail = $param_hash->{'resource.'.$part.'.awarddetail'};
+ my $timestamp = $param_hash->{'timestamp'};
+ #
+ $solved = '' if (! defined($awarded));
+ $tries = '' if (! defined($tries));
+ $awarded = '' if (! defined($awarded));
+ $award = '' if (! defined($award));
+ $awarddetail = '' if (! defined($awarddetail));
+ $newstring = "('".join("','",$symb_id,$student_id,$part_id,
+ $solved,$tries,$awarded,$award,
+ $awarddetail,$timestamp)."'),\n";
+ $store_performance_command .= $newstring;
+ $rows_stored++;
+ }
+ }
+ chop $store_parameters_command;
+ chop $store_parameters_command;
+ chop $store_performance_command;
+ chop $store_performance_command;
+ my $start = Time::HiRes::time;
+ $dbh->do($store_parameters_command) if ($num_parameters>0);
+ if ($dbh->err()) {
+ &Apache::lonnet::logthis(' bigass insert error:'.$dbh->errstr());
+ &Apache::lonnet::logthis('command = '.$store_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_performance_command);
+ $returnstatus = 'error: unable to insert performance into database';
+ return $returnstatus,\%student_data;
+ }
+ $elapsed += Time::HiRes::time - $start;
+ #
+ # Set the students update time
+ &Apache::lonmysql::replace_row($updatetime_table,
+ [$student,$time_of_retrieval]);
+ return ($returnstatus,\%student_data);
}
-# ----- END PROCESSING FUNCTIONS ---------------------------------------
+################################################
+################################################
=pod
-=head1 HELPER FUNCTIONS
+=item &ensure_current_data()
+
+Input: $sname, $sdom, $courseid
-These are just a couple of functions do various odd and end
-jobs.
+Output: $status, $data
+
+This routine ensures the data for a given student is up to date. It calls
+&init_dbs() if the tables do not exist. The $updatetime_table is queried
+to determine the time of the last update. If the students data is out of
+date, &update_student_data() is called. The return values from the call
+to &update_student_data() are returned.
=cut
-# ----- HELPER FUNCTIONS -----------------------------------------------
+################################################
+################################################
+sub ensure_current_data {
+ my ($sname,$sdom,$courseid) = @_;
+ my $status = 'okay'; # return value
+ #
+ $courseid = $ENV{'request.course.id'} if (! defined($courseid));
+ #
+ # Clean out package variables
+ &setup_table_names($courseid);
+ #
+ # if the tables do not exist, make them
+ my @CurrentTable = &Apache::lonmysql::tables_in_db();
+ my ($found_symb,$found_student,$found_part,$found_update,
+ $found_performance,$found_parameters);
+ foreach (@CurrentTable) {
+ $found_symb = 1 if ($_ eq $symb_table);
+ $found_student = 1 if ($_ eq $student_table);
+ $found_part = 1 if ($_ eq $part_table);
+ $found_update = 1 if ($_ eq $updatetime_table);
+ $found_performance = 1 if ($_ eq $performance_table);
+ $found_parameters = 1 if ($_ eq $parameters_table);
+ }
+ if (!$found_symb || !$found_update ||
+ !$found_student || !$found_part ||
+ !$found_performance || !$found_parameters) {
+ if (&init_dbs($courseid)) {
+ return 'error';
+ }
+ }
+ #
+ # Get the update time for the user
+ my $updatetime = 0;
+ my $modifiedtime = &Apache::lonnet::GetFileTimestamp
+ ($sdom,$sname,$courseid.'.db',
+ $Apache::lonnet::perlvar{'lonUsersDir'});
+ #
+ my $student = $sname.':'.$sdom;
+ my @Result = &Apache::lonmysql::get_rows($updatetime_table,
+ "student ='$student'");
+ my $data = undef;
+ if (@Result) {
+ $updatetime = $Result[0]->[1];
+ }
+ if ($modifiedtime > $updatetime) {
+ ($status,$data) = &update_student_data($sname,$sdom,$courseid);
+ }
+ return ($status,$data);
+}
+
+################################################
+################################################
=pod
-=item &ProcessFullName()
+=item &get_student_data_from_performance_cache()
-Takes lastname, generation, firstname, and middlename (or some partial
-set of this data) and returns the full name version as a string. Format
-is Lastname generation, firstname middlename or a subset of this.
+Input: $sname, $sdom, $symb, $courseid
+
+Output: hash reference containing the data for the given student.
+If $symb is undef, all the students data is returned.
+
+This routine is the heart of the local caching system. See the description
+of $performance_table, $symb_table, $student_table, and $part_table. The
+main task is building the MySQL request. The tables appear in the request
+in the order in which they should be parsed by MySQL. When searching
+on a student the $student_table is used to locate the 'student_id'. All
+rows in $performance_table which have a matching 'student_id' are returned,
+with data from $part_table and $symb_table which match the entries in
+$performance_table, 'part_id' and 'symb_id'. When searching on a symb,
+the $symb_table is processed first, with matching rows grabbed from
+$performance_table and filled in from $part_table and $student_table in
+that order.
+
+Running 'EXPLAIN ' on the 'SELECT' statements generated can be quite
+interesting, especially if you play with the order the tables are listed.
=cut
-sub ProcessFullName {
- my ($lastname, $generation, $firstname, $middlename)=@_;
- my $Str = '';
+################################################
+################################################
+sub get_student_data_from_performance_cache {
+ my ($sname,$sdom,$symb,$courseid)=@_;
+ my $student = $sname.':'.$sdom if (defined($sname) && defined($sdom));
+ &setup_table_names($courseid);
+ #
+ # Return hash
+ my $studentdata;
+ #
+ my $dbh = &Apache::lonmysql::get_dbh();
+ my $request = "SELECT ".
+ "d.symb,c.part,a.solved,a.tries,a.awarded,a.award,a.awarddetail,".
+ "a.timestamp ";
+ if (defined($student)) {
+ $request .= "FROM $student_table AS b ".
+ "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 $symb_table AS d ON d.symb_id = a.symb_id ".
+ "WHERE student='$student'";
+ if (defined($symb) && $symb ne '') {
+ $request .= " AND d.symb=".$dbh->quote($symb);
+ }
+ } elsif (defined($symb) && $symb ne '') {
+ $request .= "FROM $symb_table as d ".
+ "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 $student_table AS b ON b.student_id = a.student_id ".
+ "WHERE symb='".$dbh->quote($symb)."'";
+ }
+ my $starttime = Time::HiRes::time;
+ my $rows_retrieved = 0;
+ my $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());
+ return undef;
+ }
+ foreach my $row (@{$sth->fetchall_arrayref}) {
+ $rows_retrieved++;
+ my ($symb,$part,$solved,$tries,$awarded,$award,$awarddetail,$time) =
+ (@$row);
+ my $base = 'resource.'.$part;
+ $studentdata->{$symb}->{$base.'.solved'} = $solved;
+ $studentdata->{$symb}->{$base.'.tries'} = $tries;
+ $studentdata->{$symb}->{$base.'.awarded'} = $awarded;
+ $studentdata->{$symb}->{$base.'.award'} = $award;
+ $studentdata->{$symb}->{$base.'.awarddetail'} = $awarddetail;
+ $studentdata->{$symb}->{'timestamp'} = $time if (defined($time) && $time ne '');
+ }
+ if (defined($symb) && $symb ne '') {
+ $studentdata = $studentdata->{$symb};
+ }
+ return $studentdata;
+}
- if($lastname ne '') {
- $Str .= $lastname.' ';
- if($generation ne '') {
- $Str .= $generation;
- } else {
- chop($Str);
- }
- $Str .= ', ';
- if($firstname ne '') {
- $Str .= $firstname.' ';
- }
- if($middlename ne '') {
- $Str .= $middlename;
- } else {
- chop($Str);
- if($firstname eq '') {
- chop($Str);
- }
- }
+################################################
+################################################
+
+=pod
+
+=item &get_current_state()
+
+Input: $sname,$sdom,$symb,$courseid
+
+Output: Described below
+
+Retrieve the current status of a students performance. $sname and
+$sdom are the only required parameters. If $symb is undef the results
+of an &Apache::lonnet::currentdump() will be returned.
+If $courseid is undef it will be retrieved from the environment.
+
+The return structure is based on &Apache::lonnet::currentdump. If
+$symb is unspecified, all the students data is returned in a hash of
+the form:
+(
+ symb1 => { param1 => value1, param2 => value2 ... },
+ symb2 => { param1 => value1, param2 => value2 ... },
+)
+
+If $symb is specified, a hash of
+(
+ param1 => value1,
+ param2 => value2,
+)
+is returned.
+
+If no data is found for $symb, or if the student has no performance data,
+an empty list is returned.
+
+=cut
+
+################################################
+################################################
+sub get_current_state {
+ my ($sname,$sdom,$symb,$courseid,$forcedownload)=@_;
+ #
+ $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)) {
+ if (defined($symb)) {
+ return %{$data->{$symb}};
+ } else {
+ return %$data;
+ }
+ } elsif ($status eq 'no data') {
+ return ();
} else {
- if($firstname ne '') {
- $Str .= $firstname.' ';
- }
- if($middlename ne '') {
- $Str .= $middlename.' ';
- }
- if($generation ne '') {
- $Str .= $generation;
- } else {
- chop($Str);
- }
+ if ($status ne 'okay' && $status ne '') {
+ &Apache::lonnet::logthis('status = '.$status);
+ return ();
+ }
+ my $returnhash = &get_student_data_from_performance_cache($sname,$sdom,
+ $symb,$courseid);
+ return %$returnhash if (defined($returnhash));
}
-
- return $Str;
+ return ();
}
+################################################
+################################################
+
=pod
-=item &TestCacheData()
+=item &get_problem_statistics()
-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).
+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
=over 4
-Input: $ChartDB
+=item $students is an array of hash references.
+Each hash must contain at least the 'username' and 'domain' of a student.
-$ChartDB: The name of the cache database to be opened
+=item $symb is the symb for the problem.
-Output: -1, 0, 1
+=item $part is the part id you need statistics for
--1: Couldn't tie database
- 0: Use cached data
- 1: New cache database created, use that.
+=item $courseid is the course id, of course!
=back
-=cut
+Outputs: See the code for up to date information. A hash reference is
+returned. The hash has the following keys defined:
-sub TestCacheData {
- my ($ChartDB,$isRecalculate,$totalDelay)=@_;
- my $isCached=-1;
- my %testData;
- my $tieTries=0;
+=over 4
+
+=item num_students The number of students attempting the problem
+
+=item tries The total number of tries for the students
+
+=item max_tries The maximum number of tries taken
+
+=item mean_tries The average number of tries
+
+=item num_solved The number of students able to solve the problem
+
+=item num_override The number of students whose answer is 'correct_by_override'
+
+=item deg_of_diff The degree of difficulty of the problem
+
+=item std_tries The standard deviation of the number of tries
+
+=item skew_tries The skew of the number of tries
- if(!defined($totalDelay)) {
- $totalDelay = 10;
+=item per_wrong The number of students attempting the problem who were not
+able to answer it correctly.
+
+=back
+
+=cut
+
+################################################
+################################################
+sub get_problem_statistics {
+ my ($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';
+ #
+ my $dbh = &Apache::lonmysql::get_dbh();
+ return undef if (! defined($dbh));
+ #
+ # 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='.$part_id;
+ if (defined($students)) {
+ $request .= ' AND ('.
+ join(' OR ', map {'student_id='.
+ &get_student_id($_->{'username'},
+ $_->{'domain'})
+ } @$students
+ ).')';
}
+# &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)/$tries if ($tries>0);
+
+ my $SKEW = 'nan';
+ my $wrongpercent = 0;
+ if ($num > 0) {
+ ($SKEW) = &execute_SQL_request($dbh,'SELECT SQRT(SUM('.
+ 'POWER(tries - '.$STD.',3)'.
+ '))/'.$num.' FROM '.$stats_table);
+ $wrongpercent=int(10*100*($num-$Solved+$solved)/$num)/10;
+ }
+ #
+ $dbh->do('DROP TABLE '.$stats_table); # May return an error
+ 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 => $DegOfDiff }
+}
- if ((-e "$ChartDB") && (!$isRecalculate)) {
- $isCached = 1;
- } else {
- $isCached = 0;
+sub execute_SQL_request {
+ my ($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 ();
+}
- 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;
- }
- $tieTries++;
- sleep 1;
+
+################################################
+################################################
+
+=pod
+
+=item &setup_table_names()
+
+input: course id
+
+output: none
+
+Cleans up the package variables for local caching.
+
+=cut
+
+################################################
+################################################
+sub setup_table_names {
+ my ($courseid) = @_;
+ if (! defined($courseid)) {
+ $courseid = $ENV{'request.course.id'};
}
- if($tieTries >= $totalDelay) {
- return -1;
+ #
+ if (! defined($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
+
+=back
+
+=item End of Local Data Caching Subroutines
+
+=cut
+
+################################################
+################################################
- untie(%testData);
- return $isCached;
}
+################################################
+################################################
+
+=pod
+
+=head3 Classlist Subroutines
+
+=item &get_classlist();
-sub GetFileTimestamp {
- my ($studentDomain,$studentName,$filename,$root)=@_;
- $studentDomain=~s/\W//g;
- $studentName=~s/\W//g;
- my $subdir=$studentName.'__';
- $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
- my $proname="$studentDomain/$subdir/$studentName";
- $proname .= '/'.$filename;
- my @dir = &Apache::lonnet::dirlist($proname, $studentDomain, $studentName,
- $root);
- my $fileStat = $dir[0];
- my @stats = split('&', $fileStat);
- if(@stats) {
- return $stats[9];
+Retrieve the classist of a given class or of the current class. Student
+information is returned from the classlist.db file and, if needed,
+from the students environment.
+
+Optional arguments are $cid, $cdom, and $cnum (course id, course domain,
+and course number, respectively). Any omitted arguments will be taken
+from the current environment ($ENV{'request.course.id'},
+$ENV{'course.'.$cid.'.domain'}, and $ENV{'course.'.$cid.'.num'}).
+
+Returns a reference to a hash which contains:
+ keys '$sname:$sdom'
+ values [$sdom,$sname,$end,$start,$id,$section,$fullname,$status]
+
+The constant values CL_SDOM, CL_SNAME, CL_END, etc. can be used
+as indices into the returned list to future-proof clients against
+changes in the list order.
+
+=cut
+
+################################################
+################################################
+
+sub CL_SDOM { return 0; }
+sub CL_SNAME { return 1; }
+sub CL_END { return 2; }
+sub CL_START { return 3; }
+sub CL_ID { return 4; }
+sub CL_SECTION { return 5; }
+sub CL_FULLNAME { return 6; }
+sub CL_STATUS { return 7; }
+
+sub get_classlist {
+ my ($cid,$cdom,$cnum) = @_;
+ $cid = $cid || $ENV{'request.course.id'};
+ $cdom = $cdom || $ENV{'course.'.$cid.'.domain'};
+ $cnum = $cnum || $ENV{'course.'.$cid.'.num'};
+ my $now = time;
+ #
+ my %classlist=&Apache::lonnet::dump('classlist',$cdom,$cnum);
+ while (my ($student,$info) = each(%classlist)) {
+ if ($student =~ /^(con_lost|error|no_such_host)/i) {
+ &Apache::lonnet::logthis('get_classlist error for '.$cid.':'.$student);
+ return undef;
+ }
+ my ($sname,$sdom) = split(/:/,$student);
+ my @Values = split(/:/,$info);
+ my ($end,$start,$id,$section,$fullname);
+ if (@Values > 2) {
+ ($end,$start,$id,$section,$fullname) = @Values;
+ } else { # We have to get the data ourselves
+ ($end,$start) = @Values;
+ $section = &Apache::lonnet::getsection($sdom,$sname,$cid);
+ my %info=&Apache::lonnet::get('environment',
+ ['firstname','middlename',
+ 'lastname','generation','id'],
+ $sdom, $sname);
+ my ($tmp) = keys(%info);
+ if ($tmp =~/^(con_lost|error|no_such_host)/i) {
+ $fullname = 'not available';
+ $id = 'not available';
+ &Apache::lonnet::logthis('unable to retrieve environment '.
+ 'for '.$sname.':'.$sdom);
+ } else {
+ $fullname = &ProcessFullName(@info{qw/lastname generation
+ firstname middlename/});
+ $id = $info{'id'};
+ }
+ # Update the classlist with this students information
+ if ($fullname ne 'not available') {
+ my $enrolldata = join(':',$end,$start,$id,$section,$fullname);
+ my $reply=&Apache::lonnet::cput('classlist',
+ {$student => $enrolldata},
+ $cdom,$cnum);
+ if ($reply !~ /^(ok|delayed)/) {
+ &Apache::lonnet::logthis('Unable to update classlist for '.
+ 'student '.$sname.':'.$sdom.
+ ' error:'.$reply);
+ }
+ }
+ }
+ my $status='Expired';
+ if(((!$end) || $now < $end) && ((!$start) || ($now > $start))) {
+ $status='Active';
+ }
+ $classlist{$student} =
+ [$sdom,$sname,$end,$start,$id,$section,$fullname,$status];
+ }
+ if (wantarray()) {
+ return (\%classlist,['domain','username','end','start','id',
+ 'section','fullname','status']);
} else {
- return -1;
+ return \%classlist;
}
}
@@ -801,3 +1497,5 @@ sub GetFileTimestamp {
1;
__END__
+
+
500 Internal Server Error
Internal Server Error
The server encountered an internal error or
misconfiguration and was unable to complete
your request.
Please contact the server administrator at
root@localhost to inform them of the time this error occurred,
and the actions you performed just before this error.
More information about this error may be available
in the server error log.