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[LON-CAPA] /
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loncoursedata.pm
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Mon Jun 2 16:57:41 2003 UTC (21 years, 11 months ago) by
matthew
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MAIN
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Address Bug 1538 (read it for a description) in two ways by
a) deleting ALL the tables associated with a cache if any one is missing.
b) storing the part as well as the part_id in the performance table.
Thus if the part_id table goes missing we should either remove all the other
tables and begin caching again or, if that does not occur, be able to serve
up all the data anyway. This is an improvement over the current behavior.
# The LearningOnline Network with CAPA
#
# $Id: loncoursedata.pm,v 1.73 2003/06/02 16:57:41 matthew Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#
###
=pod
=head1 NAME
loncoursedata
=head1 SYNOPSIS
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
=cut
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;
=pod
=head1 DOWNLOAD INFORMATION
This section contains all the functions that get data from other servers
and/or itself.
=cut
####################################################
####################################################
=pod
=item &get_sequence_assessment_data()
AT THIS TIME THE USE OF THIS FUNCTION IS *NOT* RECOMMENDED
Use lonnavmaps to build a data structure describing the order and
assessment contents of each sequence in the current course.
The returned structure is a hash reference.
{ 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
}
$hash->{'contents'} is a reference to an array of hashes of the same structure.
Also returned are array references to the sequences and assessments contained
in the course.
=cut
####################################################
####################################################
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);
}
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);
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 &GetUserName(username,userdomain)
Returns a hash with the following entries:
'firstname', 'middlename', 'lastname', 'generation', and 'fullname'
'fullname' is the result of &Apache::loncoursedata::ProcessFullName.
=cut
################################################
################################################
sub GetUserName {
my ($username,$userdomain) = @_;
$username = $ENV{'user.name'} if (! defined($username));
$userdomain = $ENV{'user.domain'} if (! defined($username));
my %userenv = &Apache::lonnet::get('environment',
['firstname','middlename','lastname','generation'],
$userdomain,$username);
$userenv{'fullname'} = &ProcessFullName($userenv{'lastname'},
$userenv{'generation'},
$userenv{'firstname'},
$userenv{'middlename'});
return %userenv;
}
################################################
################################################
=pod
=item &ProcessFullName()
Takes lastname, generation, firstname, and middlename (or some partial
set of this data) and returns the full name version as a string. Format
is Lastname generation, firstname middlename or a subset of this.
=cut
################################################
################################################
sub ProcessFullName {
my ($lastname, $generation, $firstname, $middlename)=@_;
my $Str = '';
# 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 '');
}
return $Str;
}
################################################
################################################
=pod
=item &make_into_hash($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);
This is a helper function for get_current_state.
=cut
################################################
################################################
sub make_into_hash {
my $values = shift;
my %tmp = map { &Apache::lonnet::unescape($_); }
split(':',$values);
return \%tmp;
}
################################################
################################################
=pod
=head1 LOCAL DATA CACHING SUBROUTINES
The local caching is done using MySQL. There is no fall-back implementation
if MySQL is not running.
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.
Some notes before we get started.
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!
INDEXes work best on integer data.
JOIN is used to combine data from many tables into one output.
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
=head3 Important Subroutines
Here is a brief overview of the subroutines which are likely to be of
interest:
=over 4
=item &get_current_state(): programmers interface.
=item &init_dbs(): table creation
=item &update_student_data(): data storage calls
=item &get_student_data_from_performance_cache(): data retrieval
=back
=head3 Main Documentation
=over 4
=cut
################################################
################################################
################################################
################################################
{
my $current_course ='';
my $symb_table;
my $part_table;
my $student_table;
my $updatetime_table;
my $performance_table;
my $parameters_table;
################################################
################################################
=pod
=item &init_dbs()
Input: course id
Output: 0 on success, positive integer on error
This routine issues the calls to lonmysql to create the tables used to
store student data.
=cut
################################################
################################################
sub init_dbs {
my $courseid = shift;
&setup_table_names($courseid);
#
# Drop any of the existing tables
foreach my $table ($symb_table,$part_table,$student_table,
$updatetime_table,$performance_table,
$parameters_table) {
&Apache::lonmysql::drop_table($table);
}
#
# Note - changes to this table must be reflected in the code that
# 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 => 'part',
type => 'VARCHAR(100)',
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;
}
################################################
################################################
=pod
=item &delete_caches()
=cut
################################################
################################################
sub delete_caches {
my $courseid = shift;
$courseid = $ENV{'request.course.id'} if (! defined($courseid));
#
&setup_table_names($courseid);
#
my $dbh = &Apache::lonmysql::get_dbh();
foreach my $table ($symb_table,$part_table,$student_table,
$updatetime_table,$performance_table,
$parameters_table ){
my $command = 'DROP TABLE '.$table.';';
$dbh->do($command);
if ($dbh->err) {
&Apache::lonnet::logthis($command.' resulted in error: '.$dbh->errstr);
}
}
return;
}
################################################
################################################
=pod
=item &get_part_id()
Get the MySQL id of a problem part string.
Input: $part
Output: undef on error, integer $part_id on success.
=item &get_part()
Get the string describing a part from the MySQL id of the problem part.
Input: $part_id
Output: undef on error, $part string on success.
=cut
################################################
################################################
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
}
################################################
################################################
=pod
=item &get_symb_id()
Get the MySQL id of a symb.
Input: $symb
Output: undef on error, integer $symb_id on success.
=item &get_symb()
Get the symb associated with a MySQL symb_id.
Input: $symb_id
Output: undef on error, $symb on success.
=cut
################################################
################################################
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,$symb]);
undef(%ids_by_symb);
my @Result = &Apache::lonmysql::get_rows($symb_table);
foreach (@Result) {
$ids_by_symb{$_->[1]}=$_->[0];
}
}
return $ids_by_symb{$symb} if(exists( $ids_by_symb{$symb}));
return undef; # error
}
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];
}
}
return $symbs_by_id{$symb_id} if(exists( $symbs_by_id{$symb_id}));
return undef; # error
}
################################################
################################################
=pod
=item &get_student_id()
Get the MySQL id of a student.
Input: $sname, $dom
Output: undef on error, integer $student_id on success.
=item &get_student()
Get student username:domain associated with the MySQL student_id.
Input: $student_id
Output: undef on error, string $student (username:domain) on success.
=cut
################################################
################################################
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,$student]);
undef(%ids_by_student);
my @Result = &Apache::lonmysql::get_rows($student_table);
foreach (@Result) {
$ids_by_student{$_->[1]}=$_->[0];
}
}
return $ids_by_student{$student} if(exists( $ids_by_student{$student}));
return undef; # error
}
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 $students_by_id{$student_id} if(exists($students_by_id{$student_id}));
return undef; # error
}
################################################
################################################
=pod
=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,$part,
$solved,$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);
}
################################################
################################################
=pod
=item &ensure_current_data()
Input: $sname, $sdom, $courseid
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 $updatetime_table is queried
to determine the time of the last update. If the students data is out of
date, &update_student_data() is called. The return values from the call
to &update_student_data() are returned.
=cut
################################################
################################################
sub ensure_current_data {
my ($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 &get_student_data_from_performance_cache()
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 $student_table in
that order.
Running 'EXPLAIN ' on the 'SELECT' statements generated can be quite
interesting, especially if you play with the order the tables are listed.
=cut
################################################
################################################
sub get_student_data_from_performance_cache {
my ($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 $request = "SELECT ".
"d.symb,a.part,a.solved,a.tries,a.awarded,a.award,a.awarddetail,".
"a.timestamp ";
if (defined($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;
}
################################################
################################################
=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,$courseid);
&Apache::lonnet::logthis
('sname = '.$sname.
' domain = '.$sdom.
' status = '.$status.
' data is '.(defined($data)?'defined':'undefined'));
# while (my ($symb,$hash) = each(%$data)) {
# &Apache::lonnet::logthis($symb."\n----------------------------------");
# while (my ($key,$value) = each (%$hash)) {
# &Apache::lonnet::logthis(" ".$key." = ".$value);
# }
# }
#
if (defined($data)) {
if (defined($symb)) {
return %{$data->{$symb}};
} else {
return %$data;
}
} elsif ($status eq 'no data') {
return ();
} else {
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 ();
}
################################################
################################################
=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
=over 4
=item $students is an array of hash references.
Each hash must contain at least the 'username' and 'domain' of a student.
=item $symb is the symb for the problem.
=item $part is the part id you need statistics for
=item $courseid is the course id, of course!
=back
Outputs: See the code for up to date information. A hash reference is
returned. The hash has the following keys defined:
=over 4
=item num_students The number of students attempting the problem
=item tries The total number of tries for the students
=item max_tries The maximum number of tries taken
=item mean_tries The average number of tries
=item num_solved The number of students able to solve the problem
=item num_override The number of students whose answer is 'correct_by_override'
=item deg_of_diff The degree of difficulty of the problem
=item std_tries The standard deviation of the number of tries
=item skew_tries The skew of the number of tries
=item per_wrong The number of students attempting the problem who were not
able to answer it correctly.
=back
=cut
################################################
################################################
sub get_problem_statistics {
my ($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 => $DegOfDiff }
}
sub execute_SQL_request {
my ($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
=back
=item End of Local Data Caching Subroutines
=cut
################################################
################################################
}
################################################
################################################
=pod
=head3 Classlist Subroutines
=item &get_classlist();
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 \%classlist;
}
}
# ----- END HELPER FUNCTIONS --------------------------------------------
1;
__END__
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