Annotation of loncom/interface/loncoursedata.pm, revision 1.83
1.1 stredwic 1: # The LearningOnline Network with CAPA
2: #
1.82 bowersj2 3: # $Id: loncoursedata.pm,v 1.81 2003/07/14 13:10:39 matthew Exp $
1.1 stredwic 4: #
5: # Copyright Michigan State University Board of Trustees
6: #
7: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
8: #
9: # LON-CAPA is free software; you can redistribute it and/or modify
10: # it under the terms of the GNU General Public License as published by
11: # the Free Software Foundation; either version 2 of the License, or
12: # (at your option) any later version.
13: #
14: # LON-CAPA is distributed in the hope that it will be useful,
15: # but WITHOUT ANY WARRANTY; without even the implied warranty of
16: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17: # GNU General Public License for more details.
18: #
19: # You should have received a copy of the GNU General Public License
20: # along with LON-CAPA; if not, write to the Free Software
21: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22: #
23: # /home/httpd/html/adm/gpl.txt
24: #
25: # http://www.lon-capa.org/
26: #
27: ###
28:
29: =pod
30:
31: =head1 NAME
32:
33: loncoursedata
34:
35: =head1 SYNOPSIS
36:
1.22 stredwic 37: Set of functions that download and process student and course information.
1.1 stredwic 38:
39: =head1 PACKAGES USED
40:
41: Apache::Constants qw(:common :http)
42: Apache::lonnet()
1.22 stredwic 43: Apache::lonhtmlcommon
1.1 stredwic 44: HTML::TokeParser
45: GDBM_File
46:
47: =cut
48:
49: package Apache::loncoursedata;
50:
51: use strict;
52: use Apache::Constants qw(:common :http);
53: use Apache::lonnet();
1.13 stredwic 54: use Apache::lonhtmlcommon;
1.57 matthew 55: use Time::HiRes;
56: use Apache::lonmysql;
1.1 stredwic 57: use HTML::TokeParser;
58: use GDBM_File;
59:
60: =pod
61:
62: =head1 DOWNLOAD INFORMATION
63:
1.22 stredwic 64: This section contains all the functions that get data from other servers
65: and/or itself.
1.1 stredwic 66:
67: =cut
68:
1.50 matthew 69: ####################################################
70: ####################################################
1.45 matthew 71:
72: =pod
73:
74: =item &get_sequence_assessment_data()
75:
76: AT THIS TIME THE USE OF THIS FUNCTION IS *NOT* RECOMMENDED
77:
78: Use lonnavmaps to build a data structure describing the order and
79: assessment contents of each sequence in the current course.
80:
81: The returned structure is a hash reference.
82:
1.61 matthew 83: { title => 'title',
84: symb => 'symb',
85: src => '/s/o/u/r/c/e',
1.45 matthew 86: type => (container|assessment),
1.50 matthew 87: num_assess => 2, # only for container
1.45 matthew 88: parts => [11,13,15], # only for assessment
1.50 matthew 89: response_ids => [12,14,16], # only for assessment
90: contents => [........] # only for container
1.45 matthew 91: }
92:
1.50 matthew 93: $hash->{'contents'} is a reference to an array of hashes of the same structure.
94:
95: Also returned are array references to the sequences and assessments contained
96: in the course.
1.49 matthew 97:
1.45 matthew 98:
99: =cut
100:
1.50 matthew 101: ####################################################
102: ####################################################
1.45 matthew 103: sub get_sequence_assessment_data {
104: my $fn=$ENV{'request.course.fn'};
105: ##
106: ## use navmaps
1.83 ! bowersj2 107: my $navmap = Apache::lonnavmaps::navmap->new();
1.45 matthew 108: if (!defined($navmap)) {
109: return 'Can not open Coursemap';
110: }
1.75 matthew 111: # We explicity grab the top level map because I am not sure we
112: # are pulling it from the iterator.
113: my $top_level_map = $navmap->getById('0.0');
114: #
1.45 matthew 115: my $iterator = $navmap->getIterator(undef, undef, undef, 1);
1.61 matthew 116: my $curRes = $iterator->next(); # Top level sequence
1.45 matthew 117: ##
118: ## Prime the pump
119: ##
120: ## We are going to loop until we run out of sequences/pages to explore for
121: ## resources. This means we have to start out with something to look
122: ## at.
1.76 matthew 123: my $title = $ENV{'course.'.$ENV{'request.course.id'}.'.description'};
1.75 matthew 124: my $symb = $top_level_map->symb();
125: my $src = $top_level_map->src();
126: my $randompick = $top_level_map->randompick();
1.45 matthew 127: #
1.49 matthew 128: my @Sequences;
129: my @Assessments;
1.45 matthew 130: my @Nested_Sequences = (); # Stack of sequences, keeps track of depth
131: my $top = { title => $title,
1.52 matthew 132: src => $src,
1.45 matthew 133: symb => $symb,
134: type => 'container',
135: num_assess => 0,
1.53 matthew 136: num_assess_parts => 0,
1.75 matthew 137: contents => [],
138: randompick => $randompick,
139: };
1.49 matthew 140: push (@Sequences,$top);
1.45 matthew 141: push (@Nested_Sequences, $top);
142: #
143: # We need to keep track of which sequences contain homework problems
144: #
1.78 matthew 145: my $previous_too;
1.52 matthew 146: my $previous;
1.45 matthew 147: while (scalar(@Nested_Sequences)) {
1.78 matthew 148: $previous_too = $previous;
1.50 matthew 149: $previous = $curRes;
1.45 matthew 150: $curRes = $iterator->next();
151: my $currentmap = $Nested_Sequences[-1]; # Last one on the stack
152: if ($curRes == $iterator->BEGIN_MAP()) {
1.78 matthew 153: if (! ref($previous)) {
154: $previous = $previous_too;
155: }
156: if (! ref($previous)) {
157: next;
158: }
1.45 matthew 159: # get the map itself, instead of BEGIN_MAP
1.51 matthew 160: $title = $previous->title();
161: $symb = $previous->symb();
162: $src = $previous->src();
1.81 matthew 163: # pick up the filename if there is no title available
164: if (! defined($title) || $title eq '') {
165: ($title) = ($src=~/\/([^\/]*)$/);
166: }
1.75 matthew 167: $randompick = $previous->randompick();
1.45 matthew 168: my $newmap = { title => $title,
169: src => $src,
170: symb => $symb,
171: type => 'container',
172: num_assess => 0,
1.75 matthew 173: randompick => $randompick,
1.45 matthew 174: contents => [],
175: };
176: push (@{$currentmap->{'contents'}},$newmap); # this is permanent
1.49 matthew 177: push (@Sequences,$newmap);
1.45 matthew 178: push (@Nested_Sequences, $newmap); # this is a stack
179: next;
180: }
181: if ($curRes == $iterator->END_MAP()) {
182: pop(@Nested_Sequences);
183: next;
184: }
185: next if (! ref($curRes));
1.50 matthew 186: next if (! $curRes->is_problem());# && !$curRes->randomout);
1.45 matthew 187: # Okay, from here on out we only deal with assessments
188: $title = $curRes->title();
189: $symb = $curRes->symb();
190: $src = $curRes->src();
191: my $parts = $curRes->parts();
192: my $assessment = { title => $title,
193: src => $src,
194: symb => $symb,
195: type => 'assessment',
1.53 matthew 196: parts => $parts,
197: num_parts => scalar(@$parts),
1.45 matthew 198: };
1.49 matthew 199: push(@Assessments,$assessment);
1.45 matthew 200: push(@{$currentmap->{'contents'}},$assessment);
201: $currentmap->{'num_assess'}++;
1.53 matthew 202: $currentmap->{'num_assess_parts'}+= scalar(@$parts);
1.45 matthew 203: }
1.58 matthew 204: $navmap->untieHashes();
1.49 matthew 205: return ($top,\@Sequences,\@Assessments);
1.45 matthew 206: }
1.50 matthew 207:
1.4 stredwic 208: sub LoadDiscussion {
1.13 stredwic 209: my ($courseID)=@_;
1.5 minaeibi 210: my %Discuss=();
211: my %contrib=&Apache::lonnet::dump(
212: $courseID,
213: $ENV{'course.'.$courseID.'.domain'},
214: $ENV{'course.'.$courseID.'.num'});
215:
216: #my %contrib=&DownloadCourseInformation($name, $courseID, 0);
217:
1.4 stredwic 218: foreach my $temp(keys %contrib) {
219: if ($temp=~/^version/) {
220: my $ver=$contrib{$temp};
221: my ($dummy,$prb)=split(':',$temp);
222: for (my $idx=1; $idx<=$ver; $idx++ ) {
223: my $name=$contrib{"$idx:$prb:sendername"};
1.5 minaeibi 224: $Discuss{"$name:$prb"}=$idx;
1.4 stredwic 225: }
226: }
227: }
1.5 minaeibi 228:
229: return \%Discuss;
1.1 stredwic 230: }
231:
1.71 matthew 232: ################################################
233: ################################################
234:
235: =pod
236:
237: =item &GetUserName(username,userdomain)
238:
239: Returns a hash with the following entries:
240: 'firstname', 'middlename', 'lastname', 'generation', and 'fullname'
241:
242: 'fullname' is the result of &Apache::loncoursedata::ProcessFullName.
243:
244: =cut
245:
246: ################################################
247: ################################################
248: sub GetUserName {
249: my ($username,$userdomain) = @_;
250: $username = $ENV{'user.name'} if (! defined($username));
251: $userdomain = $ENV{'user.domain'} if (! defined($username));
252: my %userenv = &Apache::lonnet::get('environment',
253: ['firstname','middlename','lastname','generation'],
254: $userdomain,$username);
255: $userenv{'fullname'} = &ProcessFullName($userenv{'lastname'},
256: $userenv{'generation'},
257: $userenv{'firstname'},
258: $userenv{'middlename'});
259: return %userenv;
260: }
261:
262: ################################################
263: ################################################
264:
1.1 stredwic 265: =pod
266:
267: =item &ProcessFullName()
268:
269: Takes lastname, generation, firstname, and middlename (or some partial
270: set of this data) and returns the full name version as a string. Format
271: is Lastname generation, firstname middlename or a subset of this.
272:
273: =cut
274:
1.71 matthew 275: ################################################
276: ################################################
1.1 stredwic 277: sub ProcessFullName {
278: my ($lastname, $generation, $firstname, $middlename)=@_;
279: my $Str = '';
280:
1.34 matthew 281: # Strip whitespace preceeding & following name components.
282: $lastname =~ s/(\s+$|^\s+)//g;
283: $generation =~ s/(\s+$|^\s+)//g;
284: $firstname =~ s/(\s+$|^\s+)//g;
285: $middlename =~ s/(\s+$|^\s+)//g;
286:
1.1 stredwic 287: if($lastname ne '') {
1.34 matthew 288: $Str .= $lastname;
289: $Str .= ' '.$generation if ($generation ne '');
290: $Str .= ',';
291: $Str .= ' '.$firstname if ($firstname ne '');
292: $Str .= ' '.$middlename if ($middlename ne '');
1.1 stredwic 293: } else {
1.34 matthew 294: $Str .= $firstname if ($firstname ne '');
295: $Str .= ' '.$middlename if ($middlename ne '');
296: $Str .= ' '.$generation if ($generation ne '');
1.1 stredwic 297: }
298:
299: return $Str;
300: }
301:
1.46 matthew 302: ################################################
303: ################################################
304:
305: =pod
306:
1.47 matthew 307: =item &make_into_hash($values);
308:
309: Returns a reference to a hash as described by $values. $values is
310: assumed to be the result of
1.57 matthew 311: join(':',map {&Apache::lonnet::escape($_)} %orighash);
1.47 matthew 312:
313: This is a helper function for get_current_state.
314:
315: =cut
316:
317: ################################################
318: ################################################
319: sub make_into_hash {
320: my $values = shift;
321: my %tmp = map { &Apache::lonnet::unescape($_); }
322: split(':',$values);
323: return \%tmp;
324: }
325:
326:
327: ################################################
328: ################################################
329:
330: =pod
331:
1.57 matthew 332: =head1 LOCAL DATA CACHING SUBROUTINES
333:
334: The local caching is done using MySQL. There is no fall-back implementation
335: if MySQL is not running.
336:
337: The programmers interface is to call &get_current_state() or some other
338: primary interface subroutine (described below). The internals of this
339: storage system are documented here.
340:
341: There are six tables used to store student performance data (the results of
342: a dumpcurrent). Each of these tables is created in MySQL with a name of
343: $courseid_*****, where ***** is 'symb', 'part', or whatever is appropriate
344: for the table. The tables and their purposes are described below.
345:
346: Some notes before we get started.
347:
348: Each table must have a PRIMARY KEY, which is a column or set of columns which
349: will serve to uniquely identify a row of data. NULL is not allowed!
350:
351: INDEXes work best on integer data.
352:
353: JOIN is used to combine data from many tables into one output.
354:
355: lonmysql.pm is used for some of the interface, specifically the table creation
356: calls. The inserts are done in bulk by directly calling the database handler.
357: The SELECT ... JOIN statement used to retrieve the data does not have an
358: interface in lonmysql.pm and I shudder at the thought of writing one.
359:
360: =head3 Table Descriptions
361:
362: =over 4
363:
364: =item $symb_table
365:
366: The symb_table has two columns. The first is a 'symb_id' and the second
367: is the text name for the 'symb' (limited to 64k). The 'symb_id' is generated
368: automatically by MySQL so inserts should be done on this table with an
369: empty first element. This table has its PRIMARY KEY on the 'symb_id'.
370:
371: =item $part_table
372:
373: The part_table has two columns. The first is a 'part_id' and the second
374: is the text name for the 'part' (limited to 100 characters). The 'part_id' is
375: generated automatically by MySQL so inserts should be done on this table with
376: an empty first element. This table has its PRIMARY KEY on the 'part' (100
377: characters) and a KEY on 'part_id'.
378:
379: =item $student_table
380:
381: The student_table has two columns. The first is a 'student_id' and the second
382: is the text description of the 'student' (typically username:domain) (less
383: than 100 characters). The 'student_id' is automatically generated by MySQL.
384: The use of the name 'student_id' is loaded, I know, but this ID is used ONLY
385: internally to the MySQL database and is not the same as the students ID
386: (stored in the students environment). This table has its PRIMARY KEY on the
387: 'student' (100 characters).
388:
389: =item $updatetime_table
390:
391: The updatetime_table has two columns. The first is 'student' (100 characters,
392: typically username:domain). The second is 'updatetime', which is an unsigned
393: integer, NOT a MySQL date. This table has its PRIMARY KEY on 'student' (100
394: characters).
395:
396: =item $performance_table
397:
398: The performance_table has 9 columns. The first three are 'symb_id',
399: 'student_id', and 'part_id'. These comprise the PRIMARY KEY for this table
400: and are directly related to the $symb_table, $student_table, and $part_table
401: described above. MySQL does better indexing on numeric items than text,
402: so we use these three "index tables". The remaining columns are
403: 'solved', 'tries', 'awarded', 'award', 'awarddetail', and 'timestamp'.
404: These are either the MySQL type TINYTEXT or various integers ('tries' and
405: 'timestamp'). This table has KEYs of 'student_id' and 'symb_id'.
406: For use of this table, see the functions described below.
407:
408: =item $parameters_table
409:
410: The parameters_table holds the data that does not fit neatly into the
411: performance_table. The parameters table has four columns: 'symb_id',
412: 'student_id', 'parameter', and 'value'. 'symb_id', 'student_id', and
413: 'parameter' comprise the PRIMARY KEY for this table. 'parameter' is
414: limited to 255 characters. 'value' is limited to 64k characters.
415:
416: =back
417:
418: =head3 Important Subroutines
419:
420: Here is a brief overview of the subroutines which are likely to be of
421: interest:
422:
423: =over 4
424:
425: =item &get_current_state(): programmers interface.
426:
427: =item &init_dbs(): table creation
428:
429: =item &update_student_data(): data storage calls
430:
431: =item &get_student_data_from_performance_cache(): data retrieval
432:
433: =back
434:
435: =head3 Main Documentation
436:
437: =over 4
438:
439: =cut
440:
441: ################################################
442: ################################################
443:
444: ################################################
445: ################################################
446: {
447:
448: my $current_course ='';
449: my $symb_table;
450: my $part_table;
451: my $student_table;
452: my $updatetime_table;
453: my $performance_table;
454: my $parameters_table;
455:
456: ################################################
457: ################################################
458:
459: =pod
460:
461: =item &init_dbs()
462:
463: Input: course id
464:
465: Output: 0 on success, positive integer on error
466:
467: This routine issues the calls to lonmysql to create the tables used to
468: store student data.
469:
470: =cut
471:
472: ################################################
473: ################################################
474: sub init_dbs {
475: my $courseid = shift;
476: &setup_table_names($courseid);
477: #
1.73 matthew 478: # Drop any of the existing tables
479: foreach my $table ($symb_table,$part_table,$student_table,
480: $updatetime_table,$performance_table,
481: $parameters_table) {
482: &Apache::lonmysql::drop_table($table);
483: }
484: #
1.57 matthew 485: # Note - changes to this table must be reflected in the code that
486: # stores the data (calls &Apache::lonmysql::store_row with this table
487: # id
488: my $symb_table_def = {
489: id => $symb_table,
490: permanent => 'no',
491: columns => [{ name => 'symb_id',
492: type => 'MEDIUMINT UNSIGNED',
493: restrictions => 'NOT NULL',
494: auto_inc => 'yes', },
495: { name => 'symb',
496: type => 'MEDIUMTEXT',
497: restrictions => 'NOT NULL'},
498: ],
499: 'PRIMARY KEY' => ['symb_id'],
500: };
501: #
502: my $part_table_def = {
503: id => $part_table,
504: permanent => 'no',
505: columns => [{ name => 'part_id',
506: type => 'MEDIUMINT UNSIGNED',
507: restrictions => 'NOT NULL',
508: auto_inc => 'yes', },
509: { name => 'part',
510: type => 'VARCHAR(100)',
511: restrictions => 'NOT NULL'},
512: ],
513: 'PRIMARY KEY' => ['part (100)'],
514: 'KEY' => [{ columns => ['part_id']},],
515: };
516: #
517: my $student_table_def = {
518: id => $student_table,
519: permanent => 'no',
520: columns => [{ name => 'student_id',
521: type => 'MEDIUMINT UNSIGNED',
522: restrictions => 'NOT NULL',
523: auto_inc => 'yes', },
524: { name => 'student',
525: type => 'VARCHAR(100)',
526: restrictions => 'NOT NULL'},
527: ],
528: 'PRIMARY KEY' => ['student (100)'],
529: 'KEY' => [{ columns => ['student_id']},],
530: };
531: #
532: my $updatetime_table_def = {
533: id => $updatetime_table,
534: permanent => 'no',
535: columns => [{ name => 'student',
536: type => 'VARCHAR(100)',
537: restrictions => 'NOT NULL UNIQUE',},
538: { name => 'updatetime',
539: type => 'INT UNSIGNED',
540: restrictions => 'NOT NULL' },
541: ],
542: 'PRIMARY KEY' => ['student (100)'],
543: };
544: #
545: my $performance_table_def = {
546: id => $performance_table,
547: permanent => 'no',
548: columns => [{ name => 'symb_id',
549: type => 'MEDIUMINT UNSIGNED',
550: restrictions => 'NOT NULL' },
551: { name => 'student_id',
552: type => 'MEDIUMINT UNSIGNED',
553: restrictions => 'NOT NULL' },
554: { name => 'part_id',
555: type => 'MEDIUMINT UNSIGNED',
556: restrictions => 'NOT NULL' },
1.73 matthew 557: { name => 'part',
558: type => 'VARCHAR(100)',
559: restrictions => 'NOT NULL'},
1.57 matthew 560: { name => 'solved',
561: type => 'TINYTEXT' },
562: { name => 'tries',
563: type => 'SMALLINT UNSIGNED' },
564: { name => 'awarded',
565: type => 'TINYTEXT' },
566: { name => 'award',
567: type => 'TINYTEXT' },
568: { name => 'awarddetail',
569: type => 'TINYTEXT' },
570: { name => 'timestamp',
571: type => 'INT UNSIGNED'},
572: ],
573: 'PRIMARY KEY' => ['symb_id','student_id','part_id'],
574: 'KEY' => [{ columns=>['student_id'] },
575: { columns=>['symb_id'] },],
576: };
577: #
578: my $parameters_table_def = {
579: id => $parameters_table,
580: permanent => 'no',
581: columns => [{ name => 'symb_id',
582: type => 'MEDIUMINT UNSIGNED',
583: restrictions => 'NOT NULL' },
584: { name => 'student_id',
585: type => 'MEDIUMINT UNSIGNED',
586: restrictions => 'NOT NULL' },
587: { name => 'parameter',
588: type => 'TINYTEXT',
589: restrictions => 'NOT NULL' },
590: { name => 'value',
591: type => 'MEDIUMTEXT' },
592: ],
593: 'PRIMARY KEY' => ['symb_id','student_id','parameter (255)'],
594: };
595: #
596: # Create the tables
597: my $tableid;
598: $tableid = &Apache::lonmysql::create_table($symb_table_def);
599: if (! defined($tableid)) {
600: &Apache::lonnet::logthis("error creating symb_table: ".
601: &Apache::lonmysql::get_error());
602: return 1;
603: }
604: #
605: $tableid = &Apache::lonmysql::create_table($part_table_def);
606: if (! defined($tableid)) {
607: &Apache::lonnet::logthis("error creating part_table: ".
608: &Apache::lonmysql::get_error());
609: return 2;
610: }
611: #
612: $tableid = &Apache::lonmysql::create_table($student_table_def);
613: if (! defined($tableid)) {
614: &Apache::lonnet::logthis("error creating student_table: ".
615: &Apache::lonmysql::get_error());
616: return 3;
617: }
618: #
619: $tableid = &Apache::lonmysql::create_table($updatetime_table_def);
620: if (! defined($tableid)) {
621: &Apache::lonnet::logthis("error creating updatetime_table: ".
622: &Apache::lonmysql::get_error());
623: return 4;
624: }
625: #
626: $tableid = &Apache::lonmysql::create_table($performance_table_def);
627: if (! defined($tableid)) {
628: &Apache::lonnet::logthis("error creating preformance_table: ".
629: &Apache::lonmysql::get_error());
630: return 5;
631: }
632: #
633: $tableid = &Apache::lonmysql::create_table($parameters_table_def);
634: if (! defined($tableid)) {
635: &Apache::lonnet::logthis("error creating parameters_table: ".
636: &Apache::lonmysql::get_error());
637: return 6;
638: }
639: return 0;
1.70 matthew 640: }
641:
642: ################################################
643: ################################################
644:
645: =pod
646:
647: =item &delete_caches()
648:
649: =cut
650:
651: ################################################
652: ################################################
653: sub delete_caches {
654: my $courseid = shift;
655: $courseid = $ENV{'request.course.id'} if (! defined($courseid));
656: #
657: &setup_table_names($courseid);
658: #
659: my $dbh = &Apache::lonmysql::get_dbh();
660: foreach my $table ($symb_table,$part_table,$student_table,
661: $updatetime_table,$performance_table,
662: $parameters_table ){
663: my $command = 'DROP TABLE '.$table.';';
664: $dbh->do($command);
665: if ($dbh->err) {
666: &Apache::lonnet::logthis($command.' resulted in error: '.$dbh->errstr);
667: }
668: }
669: return;
1.57 matthew 670: }
671:
672: ################################################
673: ################################################
674:
675: =pod
676:
677: =item &get_part_id()
678:
679: Get the MySQL id of a problem part string.
680:
681: Input: $part
682:
683: Output: undef on error, integer $part_id on success.
684:
685: =item &get_part()
686:
687: Get the string describing a part from the MySQL id of the problem part.
688:
689: Input: $part_id
690:
691: Output: undef on error, $part string on success.
692:
693: =cut
694:
695: ################################################
696: ################################################
697:
1.61 matthew 698: my $have_read_part_table = 0;
1.57 matthew 699: my %ids_by_part;
700: my %parts_by_id;
701:
702: sub get_part_id {
703: my ($part) = @_;
1.61 matthew 704: $part = 0 if (! defined($part));
705: if (! $have_read_part_table) {
706: my @Result = &Apache::lonmysql::get_rows($part_table);
707: foreach (@Result) {
708: $ids_by_part{$_->[1]}=$_->[0];
709: }
710: $have_read_part_table = 1;
711: }
1.57 matthew 712: if (! exists($ids_by_part{$part})) {
713: &Apache::lonmysql::store_row($part_table,[undef,$part]);
714: undef(%ids_by_part);
715: my @Result = &Apache::lonmysql::get_rows($part_table);
716: foreach (@Result) {
717: $ids_by_part{$_->[1]}=$_->[0];
718: }
719: }
720: return $ids_by_part{$part} if (exists($ids_by_part{$part}));
721: return undef; # error
722: }
723:
724: sub get_part {
725: my ($part_id) = @_;
726: if (! exists($parts_by_id{$part_id}) ||
727: ! defined($parts_by_id{$part_id}) ||
728: $parts_by_id{$part_id} eq '') {
729: my @Result = &Apache::lonmysql::get_rows($part_table);
730: foreach (@Result) {
731: $parts_by_id{$_->[0]}=$_->[1];
732: }
733: }
734: return $parts_by_id{$part_id} if(exists($parts_by_id{$part_id}));
735: return undef; # error
736: }
737:
738: ################################################
739: ################################################
740:
741: =pod
742:
743: =item &get_symb_id()
744:
745: Get the MySQL id of a symb.
746:
747: Input: $symb
748:
749: Output: undef on error, integer $symb_id on success.
750:
751: =item &get_symb()
752:
753: Get the symb associated with a MySQL symb_id.
754:
755: Input: $symb_id
756:
757: Output: undef on error, $symb on success.
758:
759: =cut
760:
761: ################################################
762: ################################################
763:
1.61 matthew 764: my $have_read_symb_table = 0;
1.57 matthew 765: my %ids_by_symb;
766: my %symbs_by_id;
767:
768: sub get_symb_id {
769: my ($symb) = @_;
1.61 matthew 770: if (! $have_read_symb_table) {
771: my @Result = &Apache::lonmysql::get_rows($symb_table);
772: foreach (@Result) {
773: $ids_by_symb{$_->[1]}=$_->[0];
774: }
775: $have_read_symb_table = 1;
776: }
1.57 matthew 777: if (! exists($ids_by_symb{$symb})) {
778: &Apache::lonmysql::store_row($symb_table,[undef,$symb]);
779: undef(%ids_by_symb);
780: my @Result = &Apache::lonmysql::get_rows($symb_table);
781: foreach (@Result) {
782: $ids_by_symb{$_->[1]}=$_->[0];
783: }
784: }
785: return $ids_by_symb{$symb} if(exists( $ids_by_symb{$symb}));
786: return undef; # error
787: }
788:
789: sub get_symb {
790: my ($symb_id) = @_;
791: if (! exists($symbs_by_id{$symb_id}) ||
792: ! defined($symbs_by_id{$symb_id}) ||
793: $symbs_by_id{$symb_id} eq '') {
794: my @Result = &Apache::lonmysql::get_rows($symb_table);
795: foreach (@Result) {
796: $symbs_by_id{$_->[0]}=$_->[1];
797: }
798: }
799: return $symbs_by_id{$symb_id} if(exists( $symbs_by_id{$symb_id}));
800: return undef; # error
801: }
802:
803: ################################################
804: ################################################
805:
806: =pod
807:
808: =item &get_student_id()
809:
810: Get the MySQL id of a student.
811:
812: Input: $sname, $dom
813:
814: Output: undef on error, integer $student_id on success.
815:
816: =item &get_student()
817:
818: Get student username:domain associated with the MySQL student_id.
819:
820: Input: $student_id
821:
822: Output: undef on error, string $student (username:domain) on success.
823:
824: =cut
825:
826: ################################################
827: ################################################
828:
1.61 matthew 829: my $have_read_student_table = 0;
1.57 matthew 830: my %ids_by_student;
831: my %students_by_id;
832:
833: sub get_student_id {
834: my ($sname,$sdom) = @_;
835: my $student = $sname.':'.$sdom;
1.61 matthew 836: if (! $have_read_student_table) {
837: my @Result = &Apache::lonmysql::get_rows($student_table);
838: foreach (@Result) {
839: $ids_by_student{$_->[1]}=$_->[0];
840: }
841: $have_read_student_table = 1;
842: }
1.57 matthew 843: if (! exists($ids_by_student{$student})) {
844: &Apache::lonmysql::store_row($student_table,[undef,$student]);
845: undef(%ids_by_student);
846: my @Result = &Apache::lonmysql::get_rows($student_table);
847: foreach (@Result) {
848: $ids_by_student{$_->[1]}=$_->[0];
849: }
850: }
851: return $ids_by_student{$student} if(exists( $ids_by_student{$student}));
852: return undef; # error
853: }
854:
855: sub get_student {
856: my ($student_id) = @_;
857: if (! exists($students_by_id{$student_id}) ||
858: ! defined($students_by_id{$student_id}) ||
859: $students_by_id{$student_id} eq '') {
860: my @Result = &Apache::lonmysql::get_rows($student_table);
861: foreach (@Result) {
862: $students_by_id{$_->[0]}=$_->[1];
863: }
864: }
865: return $students_by_id{$student_id} if(exists($students_by_id{$student_id}));
866: return undef; # error
867: }
868:
869: ################################################
870: ################################################
871:
872: =pod
873:
874: =item &update_student_data()
875:
876: Input: $sname, $sdom, $courseid
877:
878: Output: $returnstatus, \%student_data
879:
880: $returnstatus is a string describing any errors that occured. 'okay' is the
881: default.
882: \%student_data is the data returned by a call to lonnet::currentdump.
883:
884: This subroutine loads a students data using lonnet::currentdump and inserts
885: it into the MySQL database. The inserts are done on two tables,
886: $performance_table and $parameters_table. $parameters_table holds the data
887: that is not included in $performance_table. See the description of
888: $performance_table elsewhere in this file. The INSERT calls are made
889: directly by this subroutine, not through lonmysql because we do a 'bulk'
890: insert which takes advantage of MySQLs non-SQL compliant INSERT command to
891: insert multiple rows at a time. If anything has gone wrong during this
892: process, $returnstatus is updated with a description of the error and
893: \%student_data is returned.
894:
895: Notice we do not insert the data and immediately query it. This means it
896: is possible for there to be data returned this first time that is not
897: available the second time. CYA.
898:
899: =cut
900:
901: ################################################
902: ################################################
903: sub update_student_data {
904: my ($sname,$sdom,$courseid) = @_;
905: #
1.60 matthew 906: # Set up database names
907: &setup_table_names($courseid);
908: #
1.57 matthew 909: my $student_id = &get_student_id($sname,$sdom);
910: my $student = $sname.':'.$sdom;
911: #
912: my $returnstatus = 'okay';
913: #
914: # Download students data
915: my $time_of_retrieval = time;
916: my @tmp = &Apache::lonnet::currentdump($courseid,$sdom,$sname);
917: if ((scalar(@tmp) > 0) && ($tmp[0] =~ /^error:/)) {
918: &Apache::lonnet::logthis('error getting data for '.
919: $sname.':'.$sdom.' in course '.$courseid.
920: ':'.$tmp[0]);
921: $returnstatus = 'error getting data';
1.79 matthew 922: return ($returnstatus,undef);
1.57 matthew 923: }
924: if (scalar(@tmp) < 1) {
925: return ('no data',undef);
926: }
927: my %student_data = @tmp;
928: #
929: # Remove all of the students data from the table
1.60 matthew 930: my $dbh = &Apache::lonmysql::get_dbh();
931: $dbh->do('DELETE FROM '.$performance_table.' WHERE student_id='.
932: $student_id);
933: $dbh->do('DELETE FROM '.$parameters_table.' WHERE student_id='.
934: $student_id);
1.57 matthew 935: #
936: # Store away the data
937: #
938: my $starttime = Time::HiRes::time;
939: my $elapsed = 0;
940: my $rows_stored;
941: my $store_parameters_command = 'INSERT INTO '.$parameters_table.
1.60 matthew 942: ' VALUES '."\n";
1.61 matthew 943: my $num_parameters = 0;
1.57 matthew 944: my $store_performance_command = 'INSERT INTO '.$performance_table.
1.60 matthew 945: ' VALUES '."\n";
1.79 matthew 946: return ('error',undef) if (! defined($dbh));
1.57 matthew 947: while (my ($current_symb,$param_hash) = each(%student_data)) {
948: #
949: # make sure the symb is set up properly
950: my $symb_id = &get_symb_id($current_symb);
951: #
952: # Load data into the tables
1.63 matthew 953: while (my ($parameter,$value) = each(%$param_hash)) {
1.57 matthew 954: my $newstring;
1.63 matthew 955: if ($parameter !~ /(timestamp|resource\.(.*)\.(solved|tries|awarded|award|awarddetail|previous))/) {
1.57 matthew 956: $newstring = "('".join("','",
957: $symb_id,$student_id,
1.69 matthew 958: $parameter)."',".
959: $dbh->quote($value)."),\n";
1.61 matthew 960: $num_parameters ++;
1.57 matthew 961: if ($newstring !~ /''/) {
962: $store_parameters_command .= $newstring;
963: $rows_stored++;
964: }
965: }
966: next if ($parameter !~ /^resource\.(.*)\.solved$/);
967: #
968: my $part = $1;
969: my $part_id = &get_part_id($part);
970: next if (!defined($part_id));
971: my $solved = $value;
972: my $tries = $param_hash->{'resource.'.$part.'.tries'};
973: my $awarded = $param_hash->{'resource.'.$part.'.awarded'};
974: my $award = $param_hash->{'resource.'.$part.'.award'};
975: my $awarddetail = $param_hash->{'resource.'.$part.'.awarddetail'};
976: my $timestamp = $param_hash->{'timestamp'};
1.60 matthew 977: #
1.74 matthew 978: $solved = '' if (! defined($solved));
1.57 matthew 979: $tries = '' if (! defined($tries));
980: $awarded = '' if (! defined($awarded));
981: $award = '' if (! defined($award));
982: $awarddetail = '' if (! defined($awarddetail));
1.73 matthew 983: $newstring = "('".join("','",$symb_id,$student_id,$part_id,$part,
1.57 matthew 984: $solved,$tries,$awarded,$award,
1.63 matthew 985: $awarddetail,$timestamp)."'),\n";
1.57 matthew 986: $store_performance_command .= $newstring;
987: $rows_stored++;
988: }
989: }
990: chop $store_parameters_command;
1.60 matthew 991: chop $store_parameters_command;
992: chop $store_performance_command;
1.57 matthew 993: chop $store_performance_command;
994: my $start = Time::HiRes::time;
1.61 matthew 995: $dbh->do($store_parameters_command) if ($num_parameters>0);
1.57 matthew 996: if ($dbh->err()) {
997: &Apache::lonnet::logthis(' bigass insert error:'.$dbh->errstr());
1.61 matthew 998: &Apache::lonnet::logthis('command = '.$store_parameters_command);
1.57 matthew 999: $returnstatus = 'error: unable to insert parameters into database';
1.79 matthew 1000: return ($returnstatus,\%student_data);
1.57 matthew 1001: }
1002: $dbh->do($store_performance_command);
1003: if ($dbh->err()) {
1004: &Apache::lonnet::logthis(' bigass insert error:'.$dbh->errstr());
1.61 matthew 1005: &Apache::lonnet::logthis('command = '.$store_performance_command);
1.57 matthew 1006: $returnstatus = 'error: unable to insert performance into database';
1.79 matthew 1007: return ($returnstatus,\%student_data);
1.57 matthew 1008: }
1009: $elapsed += Time::HiRes::time - $start;
1010: #
1011: # Set the students update time
1012: &Apache::lonmysql::replace_row($updatetime_table,
1013: [$student,$time_of_retrieval]);
1014: return ($returnstatus,\%student_data);
1015: }
1016:
1017: ################################################
1018: ################################################
1019:
1020: =pod
1021:
1022: =item &ensure_current_data()
1023:
1024: Input: $sname, $sdom, $courseid
1025:
1026: Output: $status, $data
1027:
1028: This routine ensures the data for a given student is up to date. It calls
1029: &init_dbs() if the tables do not exist. The $updatetime_table is queried
1030: to determine the time of the last update. If the students data is out of
1031: date, &update_student_data() is called. The return values from the call
1032: to &update_student_data() are returned.
1033:
1034: =cut
1035:
1036: ################################################
1037: ################################################
1038: sub ensure_current_data {
1039: my ($sname,$sdom,$courseid) = @_;
1040: my $status = 'okay'; # return value
1041: #
1.61 matthew 1042: $courseid = $ENV{'request.course.id'} if (! defined($courseid));
1043: #
1044: # Clean out package variables
1.57 matthew 1045: &setup_table_names($courseid);
1046: #
1047: # if the tables do not exist, make them
1048: my @CurrentTable = &Apache::lonmysql::tables_in_db();
1049: my ($found_symb,$found_student,$found_part,$found_update,
1050: $found_performance,$found_parameters);
1051: foreach (@CurrentTable) {
1052: $found_symb = 1 if ($_ eq $symb_table);
1053: $found_student = 1 if ($_ eq $student_table);
1054: $found_part = 1 if ($_ eq $part_table);
1055: $found_update = 1 if ($_ eq $updatetime_table);
1056: $found_performance = 1 if ($_ eq $performance_table);
1057: $found_parameters = 1 if ($_ eq $parameters_table);
1058: }
1059: if (!$found_symb || !$found_update ||
1060: !$found_student || !$found_part ||
1061: !$found_performance || !$found_parameters) {
1062: if (&init_dbs($courseid)) {
1.79 matthew 1063: return ('error',undef);
1.57 matthew 1064: }
1065: }
1066: #
1067: # Get the update time for the user
1068: my $updatetime = 0;
1.60 matthew 1069: my $modifiedtime = &Apache::lonnet::GetFileTimestamp
1070: ($sdom,$sname,$courseid.'.db',
1071: $Apache::lonnet::perlvar{'lonUsersDir'});
1.57 matthew 1072: #
1073: my $student = $sname.':'.$sdom;
1074: my @Result = &Apache::lonmysql::get_rows($updatetime_table,
1075: "student ='$student'");
1076: my $data = undef;
1077: if (@Result) {
1078: $updatetime = $Result[0]->[1];
1079: }
1080: if ($modifiedtime > $updatetime) {
1081: ($status,$data) = &update_student_data($sname,$sdom,$courseid);
1082: }
1083: return ($status,$data);
1084: }
1085:
1086: ################################################
1087: ################################################
1088:
1089: =pod
1090:
1091: =item &get_student_data_from_performance_cache()
1092:
1093: Input: $sname, $sdom, $symb, $courseid
1094:
1095: Output: hash reference containing the data for the given student.
1096: If $symb is undef, all the students data is returned.
1097:
1098: This routine is the heart of the local caching system. See the description
1099: of $performance_table, $symb_table, $student_table, and $part_table. The
1100: main task is building the MySQL request. The tables appear in the request
1101: in the order in which they should be parsed by MySQL. When searching
1102: on a student the $student_table is used to locate the 'student_id'. All
1103: rows in $performance_table which have a matching 'student_id' are returned,
1104: with data from $part_table and $symb_table which match the entries in
1105: $performance_table, 'part_id' and 'symb_id'. When searching on a symb,
1106: the $symb_table is processed first, with matching rows grabbed from
1107: $performance_table and filled in from $part_table and $student_table in
1108: that order.
1109:
1110: Running 'EXPLAIN ' on the 'SELECT' statements generated can be quite
1111: interesting, especially if you play with the order the tables are listed.
1112:
1113: =cut
1114:
1115: ################################################
1116: ################################################
1117: sub get_student_data_from_performance_cache {
1118: my ($sname,$sdom,$symb,$courseid)=@_;
1119: my $student = $sname.':'.$sdom if (defined($sname) && defined($sdom));
1.61 matthew 1120: &setup_table_names($courseid);
1.57 matthew 1121: #
1122: # Return hash
1123: my $studentdata;
1124: #
1125: my $dbh = &Apache::lonmysql::get_dbh();
1126: my $request = "SELECT ".
1.73 matthew 1127: "d.symb,a.part,a.solved,a.tries,a.awarded,a.award,a.awarddetail,".
1.63 matthew 1128: "a.timestamp ";
1.57 matthew 1129: if (defined($student)) {
1130: $request .= "FROM $student_table AS b ".
1131: "LEFT JOIN $performance_table AS a ON b.student_id=a.student_id ".
1.73 matthew 1132: # "LEFT JOIN $part_table AS c ON c.part_id = a.part_id ".
1.57 matthew 1133: "LEFT JOIN $symb_table AS d ON d.symb_id = a.symb_id ".
1134: "WHERE student='$student'";
1135: if (defined($symb) && $symb ne '') {
1.67 matthew 1136: $request .= " AND d.symb=".$dbh->quote($symb);
1.57 matthew 1137: }
1138: } elsif (defined($symb) && $symb ne '') {
1139: $request .= "FROM $symb_table as d ".
1140: "LEFT JOIN $performance_table AS a ON d.symb_id=a.symb_id ".
1.73 matthew 1141: # "LEFT JOIN $part_table AS c ON c.part_id = a.part_id ".
1.57 matthew 1142: "LEFT JOIN $student_table AS b ON b.student_id = a.student_id ".
1143: "WHERE symb='".$dbh->quote($symb)."'";
1144: }
1145: my $starttime = Time::HiRes::time;
1146: my $rows_retrieved = 0;
1147: my $sth = $dbh->prepare($request);
1148: $sth->execute();
1149: if ($sth->err()) {
1150: &Apache::lonnet::logthis("Unable to execute MySQL request:");
1151: &Apache::lonnet::logthis("\n".$request."\n");
1152: &Apache::lonnet::logthis("error is:".$sth->errstr());
1153: return undef;
1154: }
1155: foreach my $row (@{$sth->fetchall_arrayref}) {
1156: $rows_retrieved++;
1.63 matthew 1157: my ($symb,$part,$solved,$tries,$awarded,$award,$awarddetail,$time) =
1.57 matthew 1158: (@$row);
1159: my $base = 'resource.'.$part;
1160: $studentdata->{$symb}->{$base.'.solved'} = $solved;
1161: $studentdata->{$symb}->{$base.'.tries'} = $tries;
1162: $studentdata->{$symb}->{$base.'.awarded'} = $awarded;
1163: $studentdata->{$symb}->{$base.'.award'} = $award;
1164: $studentdata->{$symb}->{$base.'.awarddetail'} = $awarddetail;
1165: $studentdata->{$symb}->{'timestamp'} = $time if (defined($time) && $time ne '');
1.67 matthew 1166: }
1167: if (defined($symb) && $symb ne '') {
1168: $studentdata = $studentdata->{$symb};
1.57 matthew 1169: }
1170: return $studentdata;
1171: }
1172:
1173: ################################################
1174: ################################################
1175:
1176: =pod
1177:
1178: =item &get_current_state()
1179:
1180: Input: $sname,$sdom,$symb,$courseid
1181:
1182: Output: Described below
1.46 matthew 1183:
1.47 matthew 1184: Retrieve the current status of a students performance. $sname and
1.46 matthew 1185: $sdom are the only required parameters. If $symb is undef the results
1.47 matthew 1186: of an &Apache::lonnet::currentdump() will be returned.
1.46 matthew 1187: If $courseid is undef it will be retrieved from the environment.
1188:
1189: The return structure is based on &Apache::lonnet::currentdump. If
1190: $symb is unspecified, all the students data is returned in a hash of
1191: the form:
1192: (
1193: symb1 => { param1 => value1, param2 => value2 ... },
1194: symb2 => { param1 => value1, param2 => value2 ... },
1195: )
1196:
1197: If $symb is specified, a hash of
1198: (
1199: param1 => value1,
1200: param2 => value2,
1201: )
1202: is returned.
1203:
1.57 matthew 1204: If no data is found for $symb, or if the student has no performance data,
1.46 matthew 1205: an empty list is returned.
1206:
1207: =cut
1208:
1209: ################################################
1210: ################################################
1211: sub get_current_state {
1.47 matthew 1212: my ($sname,$sdom,$symb,$courseid,$forcedownload)=@_;
1213: #
1.46 matthew 1214: $courseid = $ENV{'request.course.id'} if (! defined($courseid));
1.47 matthew 1215: #
1.61 matthew 1216: return () if (! defined($sname) || ! defined($sdom));
1217: #
1.57 matthew 1218: my ($status,$data) = &ensure_current_data($sname,$sdom,$courseid);
1.77 matthew 1219: # &Apache::lonnet::logthis
1220: # ('sname = '.$sname.
1221: # ' domain = '.$sdom.
1222: # ' status = '.$status.
1223: # ' data is '.(defined($data)?'defined':'undefined'));
1.73 matthew 1224: # while (my ($symb,$hash) = each(%$data)) {
1225: # &Apache::lonnet::logthis($symb."\n----------------------------------");
1226: # while (my ($key,$value) = each (%$hash)) {
1227: # &Apache::lonnet::logthis(" ".$key." = ".$value);
1228: # }
1229: # }
1.47 matthew 1230: #
1.79 matthew 1231: if (defined($data) && defined($symb) && ref($data->{$symb})) {
1232: return %{$data->{$symb}};
1233: } elsif (defined($data) && ! defined($symb) && ref($data)) {
1234: return %$data;
1235: }
1236: if ($status eq 'no data') {
1.57 matthew 1237: return ();
1238: } else {
1239: if ($status ne 'okay' && $status ne '') {
1240: &Apache::lonnet::logthis('status = '.$status);
1.47 matthew 1241: return ();
1242: }
1.57 matthew 1243: my $returnhash = &get_student_data_from_performance_cache($sname,$sdom,
1244: $symb,$courseid);
1245: return %$returnhash if (defined($returnhash));
1.46 matthew 1246: }
1.57 matthew 1247: return ();
1.61 matthew 1248: }
1249:
1250: ################################################
1251: ################################################
1252:
1253: =pod
1254:
1255: =item &get_problem_statistics()
1256:
1257: Gather data on a given problem. The database is assumed to be
1258: populated and all local caching variables are assumed to be set
1259: properly. This means you need to call &ensure_current_data for
1260: the students you are concerned with prior to calling this routine.
1261:
1262: Inputs: $students, $symb, $part, $courseid
1263:
1.64 matthew 1264: =over 4
1265:
1266: =item $students is an array of hash references.
1267: Each hash must contain at least the 'username' and 'domain' of a student.
1268:
1269: =item $symb is the symb for the problem.
1270:
1271: =item $part is the part id you need statistics for
1272:
1273: =item $courseid is the course id, of course!
1274:
1275: =back
1276:
1.66 matthew 1277: Outputs: See the code for up to date information. A hash reference is
1278: returned. The hash has the following keys defined:
1.64 matthew 1279:
1280: =over 4
1281:
1.66 matthew 1282: =item num_students The number of students attempting the problem
1283:
1284: =item tries The total number of tries for the students
1285:
1286: =item max_tries The maximum number of tries taken
1287:
1288: =item mean_tries The average number of tries
1289:
1290: =item num_solved The number of students able to solve the problem
1291:
1292: =item num_override The number of students whose answer is 'correct_by_override'
1293:
1294: =item deg_of_diff The degree of difficulty of the problem
1295:
1296: =item std_tries The standard deviation of the number of tries
1297:
1298: =item skew_tries The skew of the number of tries
1.64 matthew 1299:
1.66 matthew 1300: =item per_wrong The number of students attempting the problem who were not
1301: able to answer it correctly.
1.64 matthew 1302:
1303: =back
1304:
1.61 matthew 1305: =cut
1306:
1307: ################################################
1308: ################################################
1309: sub get_problem_statistics {
1310: my ($students,$symb,$part,$courseid) = @_;
1311: return if (! defined($symb) || ! defined($part));
1312: $courseid = $ENV{'request.course.id'} if (! defined($courseid));
1313: #
1314: my $symb_id = &get_symb_id($symb);
1315: my $part_id = &get_part_id($part);
1316: my $stats_table = $courseid.'_problem_stats';
1317: #
1318: my $dbh = &Apache::lonmysql::get_dbh();
1319: return undef if (! defined($dbh));
1320: #
1321: # A) Number of Students attempting problem
1322: # B) Total number of tries of students attempting problem
1323: # C) Mod (largest number of tries for solving the problem)
1324: # D) Mean (average number of tries for solving the problem)
1325: # E) Number of students to solve the problem
1326: # F) Number of students to solve the problem by override
1327: # G) Number of students unable to solve the problem
1328: # H) Degree of difficulty : 1-(E+F)/B
1329: # I) Standard deviation of number of tries
1330: # J) Skew of tries: sqrt(sum(Xi-D)^3)/A
1331: #
1332: $dbh->do('DROP TABLE '.$stats_table); # May return an error
1333: my $request =
1334: 'CREATE TEMPORARY TABLE '.$stats_table.
1335: ' SELECT student_id,solved,award,tries FROM '.$performance_table.
1336: ' WHERE symb_id='.$symb_id.' AND part_id='.$part_id;
1.64 matthew 1337: if (defined($students)) {
1338: $request .= ' AND ('.
1339: join(' OR ', map {'student_id='.
1340: &get_student_id($_->{'username'},
1341: $_->{'domain'})
1342: } @$students
1343: ).')';
1344: }
1.61 matthew 1345: # &Apache::lonnet::logthis($request);
1346: $dbh->do($request);
1347: my ($num,$tries,$mod,$mean,$STD) = &execute_SQL_request
1348: ($dbh,
1349: 'SELECT COUNT(*),SUM(tries),MAX(tries),AVG(tries),STD(tries) FROM '.
1350: $stats_table);
1351: my ($Solved) = &execute_SQL_request($dbh,'SELECT COUNT(tries) FROM '.
1352: $stats_table.
1353: " WHERE solved='correct_by_student'");
1354: my ($solved) = &execute_SQL_request($dbh,'SELECT COUNT(tries) FROM '.
1355: $stats_table.
1356: " WHERE solved='correct_by_override'");
1357: $num = 0 if (! defined($num));
1358: $tries = 0 if (! defined($tries));
1359: $mod = 0 if (! defined($mod));
1360: $STD = 0 if (! defined($STD));
1361: $Solved = 0 if (! defined($Solved));
1362: $solved = 0 if (! defined($solved));
1363: #
1364: my $DegOfDiff = 'nan';
1.66 matthew 1365: $DegOfDiff = 1-($Solved)/$tries if ($tries>0);
1.61 matthew 1366:
1367: my $SKEW = 'nan';
1.66 matthew 1368: my $wrongpercent = 0;
1.61 matthew 1369: if ($num > 0) {
1370: ($SKEW) = &execute_SQL_request($dbh,'SELECT SQRT(SUM('.
1371: 'POWER(tries - '.$STD.',3)'.
1372: '))/'.$num.' FROM '.$stats_table);
1.66 matthew 1373: $wrongpercent=int(10*100*($num-$Solved+$solved)/$num)/10;
1.61 matthew 1374: }
1375: #
1376: $dbh->do('DROP TABLE '.$stats_table); # May return an error
1.81 matthew 1377: #
1378: # Store in metadata
1379: #
1.80 www 1380: if ($num) {
1381: my %storestats=();
1382:
1383: my $urlres=(split(/\_\_\_/,$symb))[2];
1384:
1385: $storestats{$courseid.'___'.$urlres.'___timestamp'}=time;
1386: $storestats{$courseid.'___'.$urlres.'___stdno'}=$num;
1387: $storestats{$courseid.'___'.$urlres.'___avetries'}=$mean;
1388: $storestats{$courseid.'___'.$urlres.'___difficulty'}=$DegOfDiff;
1389:
1390: $urlres=~/^(\w+)\/(\w+)/;
1391: &Apache::lonnet::put('nohist_resevaldata',\%storestats,$1,$2);
1392: }
1.81 matthew 1393: #
1394: # Return result
1395: #
1.66 matthew 1396: return { num_students => $num,
1397: tries => $tries,
1398: max_tries => $mod,
1399: mean_tries => $mean,
1400: std_tries => $STD,
1401: skew_tries => $SKEW,
1402: num_solved => $Solved,
1403: num_override => $solved,
1404: per_wrong => $wrongpercent,
1.81 matthew 1405: deg_of_diff => $DegOfDiff };
1.61 matthew 1406: }
1407:
1408: sub execute_SQL_request {
1409: my ($dbh,$request)=@_;
1410: # &Apache::lonnet::logthis($request);
1411: my $sth = $dbh->prepare($request);
1412: $sth->execute();
1413: my $row = $sth->fetchrow_arrayref();
1414: if (ref($row) eq 'ARRAY' && scalar(@$row)>0) {
1415: return @$row;
1416: }
1417: return ();
1418: }
1419:
1420:
1421: ################################################
1422: ################################################
1423:
1424: =pod
1425:
1426: =item &setup_table_names()
1427:
1428: input: course id
1429:
1430: output: none
1431:
1432: Cleans up the package variables for local caching.
1433:
1434: =cut
1435:
1436: ################################################
1437: ################################################
1438: sub setup_table_names {
1439: my ($courseid) = @_;
1440: if (! defined($courseid)) {
1441: $courseid = $ENV{'request.course.id'};
1442: }
1443: #
1444: if (! defined($current_course) || $current_course ne $courseid) {
1445: # Clear out variables
1446: $have_read_part_table = 0;
1447: undef(%ids_by_part);
1448: undef(%parts_by_id);
1449: $have_read_symb_table = 0;
1450: undef(%ids_by_symb);
1451: undef(%symbs_by_id);
1452: $have_read_student_table = 0;
1453: undef(%ids_by_student);
1454: undef(%students_by_id);
1455: #
1456: $current_course = $courseid;
1457: }
1458: #
1459: # Set up database names
1460: my $base_id = $courseid;
1461: $symb_table = $base_id.'_'.'symb';
1462: $part_table = $base_id.'_'.'part';
1463: $student_table = $base_id.'_'.'student';
1464: $updatetime_table = $base_id.'_'.'updatetime';
1465: $performance_table = $base_id.'_'.'performance';
1466: $parameters_table = $base_id.'_'.'parameters';
1467: return;
1.3 stredwic 1468: }
1.1 stredwic 1469:
1.35 matthew 1470: ################################################
1471: ################################################
1472:
1473: =pod
1474:
1.57 matthew 1475: =back
1476:
1477: =item End of Local Data Caching Subroutines
1478:
1479: =cut
1480:
1481: ################################################
1482: ################################################
1483:
1484:
1485: }
1486: ################################################
1487: ################################################
1488:
1489: =pod
1490:
1491: =head3 Classlist Subroutines
1492:
1.35 matthew 1493: =item &get_classlist();
1494:
1495: Retrieve the classist of a given class or of the current class. Student
1496: information is returned from the classlist.db file and, if needed,
1497: from the students environment.
1498:
1499: Optional arguments are $cid, $cdom, and $cnum (course id, course domain,
1500: and course number, respectively). Any omitted arguments will be taken
1501: from the current environment ($ENV{'request.course.id'},
1502: $ENV{'course.'.$cid.'.domain'}, and $ENV{'course.'.$cid.'.num'}).
1503:
1504: Returns a reference to a hash which contains:
1505: keys '$sname:$sdom'
1.54 bowersj2 1506: values [$sdom,$sname,$end,$start,$id,$section,$fullname,$status]
1507:
1508: The constant values CL_SDOM, CL_SNAME, CL_END, etc. can be used
1509: as indices into the returned list to future-proof clients against
1510: changes in the list order.
1.35 matthew 1511:
1512: =cut
1513:
1514: ################################################
1515: ################################################
1.54 bowersj2 1516:
1517: sub CL_SDOM { return 0; }
1518: sub CL_SNAME { return 1; }
1519: sub CL_END { return 2; }
1520: sub CL_START { return 3; }
1521: sub CL_ID { return 4; }
1522: sub CL_SECTION { return 5; }
1523: sub CL_FULLNAME { return 6; }
1524: sub CL_STATUS { return 7; }
1.35 matthew 1525:
1526: sub get_classlist {
1527: my ($cid,$cdom,$cnum) = @_;
1528: $cid = $cid || $ENV{'request.course.id'};
1529: $cdom = $cdom || $ENV{'course.'.$cid.'.domain'};
1530: $cnum = $cnum || $ENV{'course.'.$cid.'.num'};
1.57 matthew 1531: my $now = time;
1.35 matthew 1532: #
1533: my %classlist=&Apache::lonnet::dump('classlist',$cdom,$cnum);
1534: while (my ($student,$info) = each(%classlist)) {
1.60 matthew 1535: if ($student =~ /^(con_lost|error|no_such_host)/i) {
1536: &Apache::lonnet::logthis('get_classlist error for '.$cid.':'.$student);
1537: return undef;
1538: }
1.35 matthew 1539: my ($sname,$sdom) = split(/:/,$student);
1540: my @Values = split(/:/,$info);
1541: my ($end,$start,$id,$section,$fullname);
1542: if (@Values > 2) {
1543: ($end,$start,$id,$section,$fullname) = @Values;
1544: } else { # We have to get the data ourselves
1545: ($end,$start) = @Values;
1.37 matthew 1546: $section = &Apache::lonnet::getsection($sdom,$sname,$cid);
1.35 matthew 1547: my %info=&Apache::lonnet::get('environment',
1548: ['firstname','middlename',
1549: 'lastname','generation','id'],
1550: $sdom, $sname);
1551: my ($tmp) = keys(%info);
1552: if ($tmp =~/^(con_lost|error|no_such_host)/i) {
1553: $fullname = 'not available';
1554: $id = 'not available';
1.38 matthew 1555: &Apache::lonnet::logthis('unable to retrieve environment '.
1556: 'for '.$sname.':'.$sdom);
1.35 matthew 1557: } else {
1558: $fullname = &ProcessFullName(@info{qw/lastname generation
1559: firstname middlename/});
1560: $id = $info{'id'};
1561: }
1.36 matthew 1562: # Update the classlist with this students information
1563: if ($fullname ne 'not available') {
1564: my $enrolldata = join(':',$end,$start,$id,$section,$fullname);
1565: my $reply=&Apache::lonnet::cput('classlist',
1566: {$student => $enrolldata},
1567: $cdom,$cnum);
1568: if ($reply !~ /^(ok|delayed)/) {
1569: &Apache::lonnet::logthis('Unable to update classlist for '.
1570: 'student '.$sname.':'.$sdom.
1571: ' error:'.$reply);
1572: }
1573: }
1.35 matthew 1574: }
1575: my $status='Expired';
1576: if(((!$end) || $now < $end) && ((!$start) || ($now > $start))) {
1577: $status='Active';
1578: }
1579: $classlist{$student} =
1580: [$sdom,$sname,$end,$start,$id,$section,$fullname,$status];
1581: }
1582: if (wantarray()) {
1583: return (\%classlist,['domain','username','end','start','id',
1584: 'section','fullname','status']);
1585: } else {
1586: return \%classlist;
1587: }
1588: }
1589:
1.1 stredwic 1590: # ----- END HELPER FUNCTIONS --------------------------------------------
1591:
1592: 1;
1593: __END__
1.36 matthew 1594:
1.35 matthew 1595:
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