Annotation of loncom/interface/loncoursedata.pm, revision 1.87
1.1 stredwic 1: # The LearningOnline Network with CAPA
2: #
1.87 ! matthew 3: # $Id: loncoursedata.pm,v 1.86 2003/09/09 18:46:28 www 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();
1.84 matthew 161: $title =~ s/\:/\&\#058;/g;
1.51 matthew 162: $symb = $previous->symb();
163: $src = $previous->src();
1.81 matthew 164: # pick up the filename if there is no title available
165: if (! defined($title) || $title eq '') {
166: ($title) = ($src=~/\/([^\/]*)$/);
167: }
1.75 matthew 168: $randompick = $previous->randompick();
1.45 matthew 169: my $newmap = { title => $title,
170: src => $src,
171: symb => $symb,
172: type => 'container',
173: num_assess => 0,
1.75 matthew 174: randompick => $randompick,
1.45 matthew 175: contents => [],
176: };
177: push (@{$currentmap->{'contents'}},$newmap); # this is permanent
1.49 matthew 178: push (@Sequences,$newmap);
1.45 matthew 179: push (@Nested_Sequences, $newmap); # this is a stack
180: next;
181: }
182: if ($curRes == $iterator->END_MAP()) {
183: pop(@Nested_Sequences);
184: next;
185: }
186: next if (! ref($curRes));
1.50 matthew 187: next if (! $curRes->is_problem());# && !$curRes->randomout);
1.45 matthew 188: # Okay, from here on out we only deal with assessments
189: $title = $curRes->title();
1.84 matthew 190: $title =~ s/\:/\&\#058;/g;
1.45 matthew 191: $symb = $curRes->symb();
192: $src = $curRes->src();
193: my $parts = $curRes->parts();
1.87 ! matthew 194: my %partdata;
! 195: foreach my $part (@$parts) {
! 196: $partdata{$part}->{'ResponseTypes'}= $curRes->responseType($part);
! 197: $partdata{$part}->{'ResponseIds'} = $curRes->responseIds($part);
! 198: }
1.45 matthew 199: my $assessment = { title => $title,
200: src => $src,
201: symb => $symb,
202: type => 'assessment',
1.53 matthew 203: parts => $parts,
204: num_parts => scalar(@$parts),
1.87 ! matthew 205: partdata => \%partdata,
1.45 matthew 206: };
1.49 matthew 207: push(@Assessments,$assessment);
1.45 matthew 208: push(@{$currentmap->{'contents'}},$assessment);
209: $currentmap->{'num_assess'}++;
1.53 matthew 210: $currentmap->{'num_assess_parts'}+= scalar(@$parts);
1.45 matthew 211: }
1.58 matthew 212: $navmap->untieHashes();
1.49 matthew 213: return ($top,\@Sequences,\@Assessments);
1.45 matthew 214: }
1.50 matthew 215:
1.4 stredwic 216: sub LoadDiscussion {
1.13 stredwic 217: my ($courseID)=@_;
1.5 minaeibi 218: my %Discuss=();
219: my %contrib=&Apache::lonnet::dump(
220: $courseID,
221: $ENV{'course.'.$courseID.'.domain'},
222: $ENV{'course.'.$courseID.'.num'});
223:
224: #my %contrib=&DownloadCourseInformation($name, $courseID, 0);
225:
1.4 stredwic 226: foreach my $temp(keys %contrib) {
227: if ($temp=~/^version/) {
228: my $ver=$contrib{$temp};
229: my ($dummy,$prb)=split(':',$temp);
230: for (my $idx=1; $idx<=$ver; $idx++ ) {
231: my $name=$contrib{"$idx:$prb:sendername"};
1.5 minaeibi 232: $Discuss{"$name:$prb"}=$idx;
1.4 stredwic 233: }
234: }
235: }
1.5 minaeibi 236:
237: return \%Discuss;
1.1 stredwic 238: }
239:
1.71 matthew 240: ################################################
241: ################################################
242:
243: =pod
244:
245: =item &GetUserName(username,userdomain)
246:
247: Returns a hash with the following entries:
248: 'firstname', 'middlename', 'lastname', 'generation', and 'fullname'
249:
250: 'fullname' is the result of &Apache::loncoursedata::ProcessFullName.
251:
252: =cut
253:
254: ################################################
255: ################################################
256: sub GetUserName {
257: my ($username,$userdomain) = @_;
258: $username = $ENV{'user.name'} if (! defined($username));
259: $userdomain = $ENV{'user.domain'} if (! defined($username));
260: my %userenv = &Apache::lonnet::get('environment',
261: ['firstname','middlename','lastname','generation'],
262: $userdomain,$username);
263: $userenv{'fullname'} = &ProcessFullName($userenv{'lastname'},
264: $userenv{'generation'},
265: $userenv{'firstname'},
266: $userenv{'middlename'});
267: return %userenv;
268: }
269:
270: ################################################
271: ################################################
272:
1.1 stredwic 273: =pod
274:
275: =item &ProcessFullName()
276:
277: Takes lastname, generation, firstname, and middlename (or some partial
278: set of this data) and returns the full name version as a string. Format
279: is Lastname generation, firstname middlename or a subset of this.
280:
281: =cut
282:
1.71 matthew 283: ################################################
284: ################################################
1.1 stredwic 285: sub ProcessFullName {
286: my ($lastname, $generation, $firstname, $middlename)=@_;
287: my $Str = '';
288:
1.34 matthew 289: # Strip whitespace preceeding & following name components.
290: $lastname =~ s/(\s+$|^\s+)//g;
291: $generation =~ s/(\s+$|^\s+)//g;
292: $firstname =~ s/(\s+$|^\s+)//g;
293: $middlename =~ s/(\s+$|^\s+)//g;
294:
1.1 stredwic 295: if($lastname ne '') {
1.34 matthew 296: $Str .= $lastname;
297: $Str .= ' '.$generation if ($generation ne '');
298: $Str .= ',';
299: $Str .= ' '.$firstname if ($firstname ne '');
300: $Str .= ' '.$middlename if ($middlename ne '');
1.1 stredwic 301: } else {
1.34 matthew 302: $Str .= $firstname if ($firstname ne '');
303: $Str .= ' '.$middlename if ($middlename ne '');
304: $Str .= ' '.$generation if ($generation ne '');
1.1 stredwic 305: }
306:
307: return $Str;
308: }
309:
1.46 matthew 310: ################################################
311: ################################################
312:
313: =pod
314:
1.47 matthew 315: =item &make_into_hash($values);
316:
317: Returns a reference to a hash as described by $values. $values is
318: assumed to be the result of
1.57 matthew 319: join(':',map {&Apache::lonnet::escape($_)} %orighash);
1.47 matthew 320:
321: This is a helper function for get_current_state.
322:
323: =cut
324:
325: ################################################
326: ################################################
327: sub make_into_hash {
328: my $values = shift;
329: my %tmp = map { &Apache::lonnet::unescape($_); }
330: split(':',$values);
331: return \%tmp;
332: }
333:
334:
335: ################################################
336: ################################################
337:
338: =pod
339:
1.57 matthew 340: =head1 LOCAL DATA CACHING SUBROUTINES
341:
342: The local caching is done using MySQL. There is no fall-back implementation
343: if MySQL is not running.
344:
345: The programmers interface is to call &get_current_state() or some other
346: primary interface subroutine (described below). The internals of this
347: storage system are documented here.
348:
349: There are six tables used to store student performance data (the results of
350: a dumpcurrent). Each of these tables is created in MySQL with a name of
351: $courseid_*****, where ***** is 'symb', 'part', or whatever is appropriate
352: for the table. The tables and their purposes are described below.
353:
354: Some notes before we get started.
355:
356: Each table must have a PRIMARY KEY, which is a column or set of columns which
357: will serve to uniquely identify a row of data. NULL is not allowed!
358:
359: INDEXes work best on integer data.
360:
361: JOIN is used to combine data from many tables into one output.
362:
363: lonmysql.pm is used for some of the interface, specifically the table creation
364: calls. The inserts are done in bulk by directly calling the database handler.
365: The SELECT ... JOIN statement used to retrieve the data does not have an
366: interface in lonmysql.pm and I shudder at the thought of writing one.
367:
368: =head3 Table Descriptions
369:
370: =over 4
371:
372: =item $symb_table
373:
374: The symb_table has two columns. The first is a 'symb_id' and the second
375: is the text name for the 'symb' (limited to 64k). The 'symb_id' is generated
376: automatically by MySQL so inserts should be done on this table with an
377: empty first element. This table has its PRIMARY KEY on the 'symb_id'.
378:
379: =item $part_table
380:
381: The part_table has two columns. The first is a 'part_id' and the second
382: is the text name for the 'part' (limited to 100 characters). The 'part_id' is
383: generated automatically by MySQL so inserts should be done on this table with
384: an empty first element. This table has its PRIMARY KEY on the 'part' (100
385: characters) and a KEY on 'part_id'.
386:
387: =item $student_table
388:
389: The student_table has two columns. The first is a 'student_id' and the second
390: is the text description of the 'student' (typically username:domain) (less
391: than 100 characters). The 'student_id' is automatically generated by MySQL.
392: The use of the name 'student_id' is loaded, I know, but this ID is used ONLY
393: internally to the MySQL database and is not the same as the students ID
394: (stored in the students environment). This table has its PRIMARY KEY on the
395: 'student' (100 characters).
396:
1.87 ! matthew 397: =item $studentdata_table
1.57 matthew 398:
1.87 ! matthew 399: The studentdata_table has four columns. The first is 'student_id', the unique
! 400: id of the student. The second is the time the students data was last updated.
! 401: The third is the students section. The fourth is the students current
! 402: classification. This table has its PRIMARY KEY on 'student_id'.
1.57 matthew 403:
404: =item $performance_table
405:
406: The performance_table has 9 columns. The first three are 'symb_id',
407: 'student_id', and 'part_id'. These comprise the PRIMARY KEY for this table
408: and are directly related to the $symb_table, $student_table, and $part_table
409: described above. MySQL does better indexing on numeric items than text,
410: so we use these three "index tables". The remaining columns are
411: 'solved', 'tries', 'awarded', 'award', 'awarddetail', and 'timestamp'.
412: These are either the MySQL type TINYTEXT or various integers ('tries' and
413: 'timestamp'). This table has KEYs of 'student_id' and 'symb_id'.
414: For use of this table, see the functions described below.
415:
416: =item $parameters_table
417:
418: The parameters_table holds the data that does not fit neatly into the
419: performance_table. The parameters table has four columns: 'symb_id',
420: 'student_id', 'parameter', and 'value'. 'symb_id', 'student_id', and
421: 'parameter' comprise the PRIMARY KEY for this table. 'parameter' is
422: limited to 255 characters. 'value' is limited to 64k characters.
423:
424: =back
425:
426: =head3 Important Subroutines
427:
428: Here is a brief overview of the subroutines which are likely to be of
429: interest:
430:
431: =over 4
432:
433: =item &get_current_state(): programmers interface.
434:
435: =item &init_dbs(): table creation
436:
437: =item &update_student_data(): data storage calls
438:
439: =item &get_student_data_from_performance_cache(): data retrieval
440:
441: =back
442:
443: =head3 Main Documentation
444:
445: =over 4
446:
447: =cut
448:
449: ################################################
450: ################################################
451:
452: ################################################
453: ################################################
454: {
455:
456: my $current_course ='';
457: my $symb_table;
458: my $part_table;
459: my $student_table;
1.87 ! matthew 460: my $studentdata_table;
1.57 matthew 461: my $performance_table;
462: my $parameters_table;
463:
464: ################################################
465: ################################################
466:
467: =pod
468:
469: =item &init_dbs()
470:
471: Input: course id
472:
473: Output: 0 on success, positive integer on error
474:
475: This routine issues the calls to lonmysql to create the tables used to
476: store student data.
477:
478: =cut
479:
480: ################################################
481: ################################################
482: sub init_dbs {
483: my $courseid = shift;
484: &setup_table_names($courseid);
485: #
1.73 matthew 486: # Drop any of the existing tables
487: foreach my $table ($symb_table,$part_table,$student_table,
1.87 ! matthew 488: $studentdata_table,$performance_table,
1.73 matthew 489: $parameters_table) {
490: &Apache::lonmysql::drop_table($table);
491: }
492: #
1.57 matthew 493: # Note - changes to this table must be reflected in the code that
494: # stores the data (calls &Apache::lonmysql::store_row with this table
495: # id
496: my $symb_table_def = {
497: id => $symb_table,
498: permanent => 'no',
499: columns => [{ name => 'symb_id',
500: type => 'MEDIUMINT UNSIGNED',
501: restrictions => 'NOT NULL',
502: auto_inc => 'yes', },
503: { name => 'symb',
504: type => 'MEDIUMTEXT',
505: restrictions => 'NOT NULL'},
506: ],
507: 'PRIMARY KEY' => ['symb_id'],
508: };
509: #
510: my $part_table_def = {
511: id => $part_table,
512: permanent => 'no',
513: columns => [{ name => 'part_id',
514: type => 'MEDIUMINT UNSIGNED',
515: restrictions => 'NOT NULL',
516: auto_inc => 'yes', },
517: { name => 'part',
518: type => 'VARCHAR(100)',
519: restrictions => 'NOT NULL'},
520: ],
521: 'PRIMARY KEY' => ['part (100)'],
522: 'KEY' => [{ columns => ['part_id']},],
523: };
524: #
525: my $student_table_def = {
526: id => $student_table,
527: permanent => 'no',
528: columns => [{ name => 'student_id',
529: type => 'MEDIUMINT UNSIGNED',
530: restrictions => 'NOT NULL',
531: auto_inc => 'yes', },
532: { name => 'student',
533: type => 'VARCHAR(100)',
534: restrictions => 'NOT NULL'},
1.85 matthew 535: { name => 'classification',
536: type => 'varchar(100)', },
1.57 matthew 537: ],
538: 'PRIMARY KEY' => ['student (100)'],
539: 'KEY' => [{ columns => ['student_id']},],
540: };
541: #
1.87 ! matthew 542: my $studentdata_table_def = {
! 543: id => $studentdata_table,
1.57 matthew 544: permanent => 'no',
1.87 ! matthew 545: columns => [{ name => 'student_id',
! 546: type => 'MEDIUMINT UNSIGNED',
1.57 matthew 547: restrictions => 'NOT NULL UNIQUE',},
548: { name => 'updatetime',
549: type => 'INT UNSIGNED',
550: restrictions => 'NOT NULL' },
1.87 ! matthew 551: { name => 'section',
! 552: type => 'VARCHAR(100)'},
! 553: { name => 'classification',
! 554: type => 'VARCHAR(100)', },
1.57 matthew 555: ],
1.87 ! matthew 556: 'PRIMARY KEY' => ['student_id'],
1.57 matthew 557: };
558: #
559: my $performance_table_def = {
560: id => $performance_table,
561: permanent => 'no',
562: columns => [{ name => 'symb_id',
563: type => 'MEDIUMINT UNSIGNED',
564: restrictions => 'NOT NULL' },
565: { name => 'student_id',
566: type => 'MEDIUMINT UNSIGNED',
567: restrictions => 'NOT NULL' },
568: { name => 'part_id',
569: type => 'MEDIUMINT UNSIGNED',
570: restrictions => 'NOT NULL' },
1.73 matthew 571: { name => 'part',
572: type => 'VARCHAR(100)',
573: restrictions => 'NOT NULL'},
1.57 matthew 574: { name => 'solved',
575: type => 'TINYTEXT' },
576: { name => 'tries',
577: type => 'SMALLINT UNSIGNED' },
578: { name => 'awarded',
579: type => 'TINYTEXT' },
580: { name => 'award',
581: type => 'TINYTEXT' },
582: { name => 'awarddetail',
583: type => 'TINYTEXT' },
584: { name => 'timestamp',
585: type => 'INT UNSIGNED'},
586: ],
587: 'PRIMARY KEY' => ['symb_id','student_id','part_id'],
588: 'KEY' => [{ columns=>['student_id'] },
589: { columns=>['symb_id'] },],
590: };
591: #
592: my $parameters_table_def = {
593: id => $parameters_table,
594: permanent => 'no',
595: columns => [{ name => 'symb_id',
596: type => 'MEDIUMINT UNSIGNED',
597: restrictions => 'NOT NULL' },
598: { name => 'student_id',
599: type => 'MEDIUMINT UNSIGNED',
600: restrictions => 'NOT NULL' },
601: { name => 'parameter',
602: type => 'TINYTEXT',
603: restrictions => 'NOT NULL' },
604: { name => 'value',
605: type => 'MEDIUMTEXT' },
606: ],
607: 'PRIMARY KEY' => ['symb_id','student_id','parameter (255)'],
608: };
609: #
610: # Create the tables
611: my $tableid;
612: $tableid = &Apache::lonmysql::create_table($symb_table_def);
613: if (! defined($tableid)) {
614: &Apache::lonnet::logthis("error creating symb_table: ".
615: &Apache::lonmysql::get_error());
616: return 1;
617: }
618: #
619: $tableid = &Apache::lonmysql::create_table($part_table_def);
620: if (! defined($tableid)) {
621: &Apache::lonnet::logthis("error creating part_table: ".
622: &Apache::lonmysql::get_error());
623: return 2;
624: }
625: #
626: $tableid = &Apache::lonmysql::create_table($student_table_def);
627: if (! defined($tableid)) {
628: &Apache::lonnet::logthis("error creating student_table: ".
629: &Apache::lonmysql::get_error());
630: return 3;
631: }
632: #
1.87 ! matthew 633: $tableid = &Apache::lonmysql::create_table($studentdata_table_def);
1.57 matthew 634: if (! defined($tableid)) {
1.87 ! matthew 635: &Apache::lonnet::logthis("error creating studentdata_table: ".
1.57 matthew 636: &Apache::lonmysql::get_error());
637: return 4;
638: }
639: #
640: $tableid = &Apache::lonmysql::create_table($performance_table_def);
641: if (! defined($tableid)) {
642: &Apache::lonnet::logthis("error creating preformance_table: ".
643: &Apache::lonmysql::get_error());
644: return 5;
645: }
646: #
647: $tableid = &Apache::lonmysql::create_table($parameters_table_def);
648: if (! defined($tableid)) {
649: &Apache::lonnet::logthis("error creating parameters_table: ".
650: &Apache::lonmysql::get_error());
651: return 6;
652: }
653: return 0;
1.70 matthew 654: }
655:
656: ################################################
657: ################################################
658:
659: =pod
660:
661: =item &delete_caches()
662:
663: =cut
664:
665: ################################################
666: ################################################
667: sub delete_caches {
668: my $courseid = shift;
669: $courseid = $ENV{'request.course.id'} if (! defined($courseid));
670: #
671: &setup_table_names($courseid);
672: #
673: my $dbh = &Apache::lonmysql::get_dbh();
674: foreach my $table ($symb_table,$part_table,$student_table,
1.87 ! matthew 675: $studentdata_table,$performance_table,
1.70 matthew 676: $parameters_table ){
677: my $command = 'DROP TABLE '.$table.';';
678: $dbh->do($command);
679: if ($dbh->err) {
680: &Apache::lonnet::logthis($command.' resulted in error: '.$dbh->errstr);
681: }
682: }
683: return;
1.57 matthew 684: }
685:
686: ################################################
687: ################################################
688:
689: =pod
690:
691: =item &get_part_id()
692:
693: Get the MySQL id of a problem part string.
694:
695: Input: $part
696:
697: Output: undef on error, integer $part_id on success.
698:
699: =item &get_part()
700:
701: Get the string describing a part from the MySQL id of the problem part.
702:
703: Input: $part_id
704:
705: Output: undef on error, $part string on success.
706:
707: =cut
708:
709: ################################################
710: ################################################
711:
1.61 matthew 712: my $have_read_part_table = 0;
1.57 matthew 713: my %ids_by_part;
714: my %parts_by_id;
715:
716: sub get_part_id {
717: my ($part) = @_;
1.61 matthew 718: $part = 0 if (! defined($part));
719: if (! $have_read_part_table) {
720: my @Result = &Apache::lonmysql::get_rows($part_table);
721: foreach (@Result) {
722: $ids_by_part{$_->[1]}=$_->[0];
723: }
724: $have_read_part_table = 1;
725: }
1.57 matthew 726: if (! exists($ids_by_part{$part})) {
727: &Apache::lonmysql::store_row($part_table,[undef,$part]);
728: undef(%ids_by_part);
729: my @Result = &Apache::lonmysql::get_rows($part_table);
730: foreach (@Result) {
731: $ids_by_part{$_->[1]}=$_->[0];
732: }
733: }
734: return $ids_by_part{$part} if (exists($ids_by_part{$part}));
735: return undef; # error
736: }
737:
738: sub get_part {
739: my ($part_id) = @_;
740: if (! exists($parts_by_id{$part_id}) ||
741: ! defined($parts_by_id{$part_id}) ||
742: $parts_by_id{$part_id} eq '') {
743: my @Result = &Apache::lonmysql::get_rows($part_table);
744: foreach (@Result) {
745: $parts_by_id{$_->[0]}=$_->[1];
746: }
747: }
748: return $parts_by_id{$part_id} if(exists($parts_by_id{$part_id}));
749: return undef; # error
750: }
751:
752: ################################################
753: ################################################
754:
755: =pod
756:
757: =item &get_symb_id()
758:
759: Get the MySQL id of a symb.
760:
761: Input: $symb
762:
763: Output: undef on error, integer $symb_id on success.
764:
765: =item &get_symb()
766:
767: Get the symb associated with a MySQL symb_id.
768:
769: Input: $symb_id
770:
771: Output: undef on error, $symb on success.
772:
773: =cut
774:
775: ################################################
776: ################################################
777:
1.61 matthew 778: my $have_read_symb_table = 0;
1.57 matthew 779: my %ids_by_symb;
780: my %symbs_by_id;
781:
782: sub get_symb_id {
783: my ($symb) = @_;
1.61 matthew 784: if (! $have_read_symb_table) {
785: my @Result = &Apache::lonmysql::get_rows($symb_table);
786: foreach (@Result) {
787: $ids_by_symb{$_->[1]}=$_->[0];
788: }
789: $have_read_symb_table = 1;
790: }
1.57 matthew 791: if (! exists($ids_by_symb{$symb})) {
792: &Apache::lonmysql::store_row($symb_table,[undef,$symb]);
793: undef(%ids_by_symb);
794: my @Result = &Apache::lonmysql::get_rows($symb_table);
795: foreach (@Result) {
796: $ids_by_symb{$_->[1]}=$_->[0];
797: }
798: }
799: return $ids_by_symb{$symb} if(exists( $ids_by_symb{$symb}));
800: return undef; # error
801: }
802:
803: sub get_symb {
804: my ($symb_id) = @_;
805: if (! exists($symbs_by_id{$symb_id}) ||
806: ! defined($symbs_by_id{$symb_id}) ||
807: $symbs_by_id{$symb_id} eq '') {
808: my @Result = &Apache::lonmysql::get_rows($symb_table);
809: foreach (@Result) {
810: $symbs_by_id{$_->[0]}=$_->[1];
811: }
812: }
813: return $symbs_by_id{$symb_id} if(exists( $symbs_by_id{$symb_id}));
814: return undef; # error
815: }
816:
817: ################################################
818: ################################################
819:
820: =pod
821:
822: =item &get_student_id()
823:
824: Get the MySQL id of a student.
825:
826: Input: $sname, $dom
827:
828: Output: undef on error, integer $student_id on success.
829:
830: =item &get_student()
831:
832: Get student username:domain associated with the MySQL student_id.
833:
834: Input: $student_id
835:
836: Output: undef on error, string $student (username:domain) on success.
837:
838: =cut
839:
840: ################################################
841: ################################################
842:
1.61 matthew 843: my $have_read_student_table = 0;
1.57 matthew 844: my %ids_by_student;
845: my %students_by_id;
846:
847: sub get_student_id {
848: my ($sname,$sdom) = @_;
849: my $student = $sname.':'.$sdom;
1.61 matthew 850: if (! $have_read_student_table) {
851: my @Result = &Apache::lonmysql::get_rows($student_table);
852: foreach (@Result) {
853: $ids_by_student{$_->[1]}=$_->[0];
854: }
855: $have_read_student_table = 1;
856: }
1.57 matthew 857: if (! exists($ids_by_student{$student})) {
1.85 matthew 858: &Apache::lonmysql::store_row($student_table,[undef,$student,undef]);
1.57 matthew 859: undef(%ids_by_student);
860: my @Result = &Apache::lonmysql::get_rows($student_table);
861: foreach (@Result) {
862: $ids_by_student{$_->[1]}=$_->[0];
863: }
864: }
865: return $ids_by_student{$student} if(exists( $ids_by_student{$student}));
866: return undef; # error
867: }
868:
869: sub get_student {
870: my ($student_id) = @_;
871: if (! exists($students_by_id{$student_id}) ||
872: ! defined($students_by_id{$student_id}) ||
873: $students_by_id{$student_id} eq '') {
874: my @Result = &Apache::lonmysql::get_rows($student_table);
875: foreach (@Result) {
876: $students_by_id{$_->[0]}=$_->[1];
877: }
878: }
879: return $students_by_id{$student_id} if(exists($students_by_id{$student_id}));
880: return undef; # error
881: }
882:
883: ################################################
884: ################################################
885:
886: =pod
887:
888: =item &update_student_data()
889:
890: Input: $sname, $sdom, $courseid
891:
892: Output: $returnstatus, \%student_data
893:
894: $returnstatus is a string describing any errors that occured. 'okay' is the
895: default.
896: \%student_data is the data returned by a call to lonnet::currentdump.
897:
898: This subroutine loads a students data using lonnet::currentdump and inserts
899: it into the MySQL database. The inserts are done on two tables,
900: $performance_table and $parameters_table. $parameters_table holds the data
901: that is not included in $performance_table. See the description of
902: $performance_table elsewhere in this file. The INSERT calls are made
903: directly by this subroutine, not through lonmysql because we do a 'bulk'
904: insert which takes advantage of MySQLs non-SQL compliant INSERT command to
905: insert multiple rows at a time. If anything has gone wrong during this
906: process, $returnstatus is updated with a description of the error and
907: \%student_data is returned.
908:
909: Notice we do not insert the data and immediately query it. This means it
910: is possible for there to be data returned this first time that is not
911: available the second time. CYA.
912:
913: =cut
914:
915: ################################################
916: ################################################
917: sub update_student_data {
918: my ($sname,$sdom,$courseid) = @_;
919: #
1.60 matthew 920: # Set up database names
921: &setup_table_names($courseid);
922: #
1.57 matthew 923: my $student_id = &get_student_id($sname,$sdom);
924: my $student = $sname.':'.$sdom;
925: #
926: my $returnstatus = 'okay';
927: #
928: # Download students data
929: my $time_of_retrieval = time;
930: my @tmp = &Apache::lonnet::currentdump($courseid,$sdom,$sname);
931: if ((scalar(@tmp) > 0) && ($tmp[0] =~ /^error:/)) {
932: &Apache::lonnet::logthis('error getting data for '.
933: $sname.':'.$sdom.' in course '.$courseid.
934: ':'.$tmp[0]);
935: $returnstatus = 'error getting data';
1.79 matthew 936: return ($returnstatus,undef);
1.57 matthew 937: }
938: if (scalar(@tmp) < 1) {
939: return ('no data',undef);
940: }
941: my %student_data = @tmp;
942: #
943: # Remove all of the students data from the table
1.60 matthew 944: my $dbh = &Apache::lonmysql::get_dbh();
945: $dbh->do('DELETE FROM '.$performance_table.' WHERE student_id='.
946: $student_id);
947: $dbh->do('DELETE FROM '.$parameters_table.' WHERE student_id='.
948: $student_id);
1.57 matthew 949: #
950: # Store away the data
951: #
952: my $starttime = Time::HiRes::time;
953: my $elapsed = 0;
954: my $rows_stored;
955: my $store_parameters_command = 'INSERT INTO '.$parameters_table.
1.60 matthew 956: ' VALUES '."\n";
1.61 matthew 957: my $num_parameters = 0;
1.57 matthew 958: my $store_performance_command = 'INSERT INTO '.$performance_table.
1.60 matthew 959: ' VALUES '."\n";
1.79 matthew 960: return ('error',undef) if (! defined($dbh));
1.57 matthew 961: while (my ($current_symb,$param_hash) = each(%student_data)) {
962: #
963: # make sure the symb is set up properly
964: my $symb_id = &get_symb_id($current_symb);
965: #
966: # Load data into the tables
1.63 matthew 967: while (my ($parameter,$value) = each(%$param_hash)) {
1.57 matthew 968: my $newstring;
1.63 matthew 969: if ($parameter !~ /(timestamp|resource\.(.*)\.(solved|tries|awarded|award|awarddetail|previous))/) {
1.57 matthew 970: $newstring = "('".join("','",
971: $symb_id,$student_id,
1.69 matthew 972: $parameter)."',".
973: $dbh->quote($value)."),\n";
1.61 matthew 974: $num_parameters ++;
1.57 matthew 975: if ($newstring !~ /''/) {
976: $store_parameters_command .= $newstring;
977: $rows_stored++;
978: }
979: }
980: next if ($parameter !~ /^resource\.(.*)\.solved$/);
981: #
982: my $part = $1;
983: my $part_id = &get_part_id($part);
984: next if (!defined($part_id));
985: my $solved = $value;
986: my $tries = $param_hash->{'resource.'.$part.'.tries'};
987: my $awarded = $param_hash->{'resource.'.$part.'.awarded'};
988: my $award = $param_hash->{'resource.'.$part.'.award'};
989: my $awarddetail = $param_hash->{'resource.'.$part.'.awarddetail'};
990: my $timestamp = $param_hash->{'timestamp'};
1.60 matthew 991: #
1.74 matthew 992: $solved = '' if (! defined($solved));
1.57 matthew 993: $tries = '' if (! defined($tries));
994: $awarded = '' if (! defined($awarded));
995: $award = '' if (! defined($award));
996: $awarddetail = '' if (! defined($awarddetail));
1.73 matthew 997: $newstring = "('".join("','",$symb_id,$student_id,$part_id,$part,
1.57 matthew 998: $solved,$tries,$awarded,$award,
1.63 matthew 999: $awarddetail,$timestamp)."'),\n";
1.57 matthew 1000: $store_performance_command .= $newstring;
1001: $rows_stored++;
1002: }
1003: }
1004: chop $store_parameters_command;
1.60 matthew 1005: chop $store_parameters_command;
1006: chop $store_performance_command;
1.57 matthew 1007: chop $store_performance_command;
1008: my $start = Time::HiRes::time;
1.61 matthew 1009: $dbh->do($store_parameters_command) if ($num_parameters>0);
1.57 matthew 1010: if ($dbh->err()) {
1011: &Apache::lonnet::logthis(' bigass insert error:'.$dbh->errstr());
1.61 matthew 1012: &Apache::lonnet::logthis('command = '.$store_parameters_command);
1.87 ! matthew 1013: &Apache::lonnet::logthis('rows_stored = '.$rows_stored);
! 1014: &Apache::lonnet::logthis('student_id = '.$student_id);
1.57 matthew 1015: $returnstatus = 'error: unable to insert parameters into database';
1.79 matthew 1016: return ($returnstatus,\%student_data);
1.57 matthew 1017: }
1018: $dbh->do($store_performance_command);
1019: if ($dbh->err()) {
1020: &Apache::lonnet::logthis(' bigass insert error:'.$dbh->errstr());
1.61 matthew 1021: &Apache::lonnet::logthis('command = '.$store_performance_command);
1.57 matthew 1022: $returnstatus = 'error: unable to insert performance into database';
1.79 matthew 1023: return ($returnstatus,\%student_data);
1.57 matthew 1024: }
1025: $elapsed += Time::HiRes::time - $start;
1026: #
1027: # Set the students update time
1.87 ! matthew 1028: &Apache::lonmysql::replace_row($studentdata_table,
! 1029: [$student_id,$time_of_retrieval,undef,undef]);
1.57 matthew 1030: return ($returnstatus,\%student_data);
1031: }
1032:
1033: ################################################
1034: ################################################
1035:
1036: =pod
1037:
1038: =item &ensure_current_data()
1039:
1040: Input: $sname, $sdom, $courseid
1041:
1042: Output: $status, $data
1043:
1044: This routine ensures the data for a given student is up to date. It calls
1.87 ! matthew 1045: &init_dbs() if the tables do not exist. The $studentdata_table is queried
1.57 matthew 1046: to determine the time of the last update. If the students data is out of
1047: date, &update_student_data() is called. The return values from the call
1048: to &update_student_data() are returned.
1049:
1050: =cut
1051:
1052: ################################################
1053: ################################################
1054: sub ensure_current_data {
1055: my ($sname,$sdom,$courseid) = @_;
1056: my $status = 'okay'; # return value
1057: #
1.61 matthew 1058: $courseid = $ENV{'request.course.id'} if (! defined($courseid));
1059: #
1060: # Clean out package variables
1.57 matthew 1061: &setup_table_names($courseid);
1062: #
1063: # if the tables do not exist, make them
1064: my @CurrentTable = &Apache::lonmysql::tables_in_db();
1.87 ! matthew 1065: my ($found_symb,$found_student,$found_part,$found_studentdata,
1.57 matthew 1066: $found_performance,$found_parameters);
1067: foreach (@CurrentTable) {
1068: $found_symb = 1 if ($_ eq $symb_table);
1069: $found_student = 1 if ($_ eq $student_table);
1070: $found_part = 1 if ($_ eq $part_table);
1.87 ! matthew 1071: $found_studentdata = 1 if ($_ eq $studentdata_table);
1.57 matthew 1072: $found_performance = 1 if ($_ eq $performance_table);
1073: $found_parameters = 1 if ($_ eq $parameters_table);
1074: }
1.87 ! matthew 1075: if (!$found_symb || !$found_studentdata ||
1.57 matthew 1076: !$found_student || !$found_part ||
1077: !$found_performance || !$found_parameters) {
1078: if (&init_dbs($courseid)) {
1.79 matthew 1079: return ('error',undef);
1.57 matthew 1080: }
1081: }
1082: #
1083: # Get the update time for the user
1084: my $updatetime = 0;
1.60 matthew 1085: my $modifiedtime = &Apache::lonnet::GetFileTimestamp
1086: ($sdom,$sname,$courseid.'.db',
1087: $Apache::lonnet::perlvar{'lonUsersDir'});
1.57 matthew 1088: #
1.87 ! matthew 1089: my $student_id = &get_student_id($sname,$sdom);
! 1090: my @Result = &Apache::lonmysql::get_rows($studentdata_table,
! 1091: "student_id ='$student_id'");
1.57 matthew 1092: my $data = undef;
1093: if (@Result) {
1094: $updatetime = $Result[0]->[1];
1095: }
1096: if ($modifiedtime > $updatetime) {
1097: ($status,$data) = &update_student_data($sname,$sdom,$courseid);
1098: }
1099: return ($status,$data);
1100: }
1101:
1102: ################################################
1103: ################################################
1104:
1105: =pod
1106:
1107: =item &get_student_data_from_performance_cache()
1108:
1109: Input: $sname, $sdom, $symb, $courseid
1110:
1111: Output: hash reference containing the data for the given student.
1112: If $symb is undef, all the students data is returned.
1113:
1114: This routine is the heart of the local caching system. See the description
1115: of $performance_table, $symb_table, $student_table, and $part_table. The
1116: main task is building the MySQL request. The tables appear in the request
1117: in the order in which they should be parsed by MySQL. When searching
1118: on a student the $student_table is used to locate the 'student_id'. All
1119: rows in $performance_table which have a matching 'student_id' are returned,
1120: with data from $part_table and $symb_table which match the entries in
1121: $performance_table, 'part_id' and 'symb_id'. When searching on a symb,
1122: the $symb_table is processed first, with matching rows grabbed from
1123: $performance_table and filled in from $part_table and $student_table in
1124: that order.
1125:
1126: Running 'EXPLAIN ' on the 'SELECT' statements generated can be quite
1127: interesting, especially if you play with the order the tables are listed.
1128:
1129: =cut
1130:
1131: ################################################
1132: ################################################
1133: sub get_student_data_from_performance_cache {
1134: my ($sname,$sdom,$symb,$courseid)=@_;
1135: my $student = $sname.':'.$sdom if (defined($sname) && defined($sdom));
1.61 matthew 1136: &setup_table_names($courseid);
1.57 matthew 1137: #
1138: # Return hash
1139: my $studentdata;
1140: #
1141: my $dbh = &Apache::lonmysql::get_dbh();
1142: my $request = "SELECT ".
1.73 matthew 1143: "d.symb,a.part,a.solved,a.tries,a.awarded,a.award,a.awarddetail,".
1.63 matthew 1144: "a.timestamp ";
1.57 matthew 1145: if (defined($student)) {
1146: $request .= "FROM $student_table AS b ".
1147: "LEFT JOIN $performance_table AS a ON b.student_id=a.student_id ".
1.73 matthew 1148: # "LEFT JOIN $part_table AS c ON c.part_id = a.part_id ".
1.57 matthew 1149: "LEFT JOIN $symb_table AS d ON d.symb_id = a.symb_id ".
1150: "WHERE student='$student'";
1151: if (defined($symb) && $symb ne '') {
1.67 matthew 1152: $request .= " AND d.symb=".$dbh->quote($symb);
1.57 matthew 1153: }
1154: } elsif (defined($symb) && $symb ne '') {
1155: $request .= "FROM $symb_table as d ".
1156: "LEFT JOIN $performance_table AS a ON d.symb_id=a.symb_id ".
1.73 matthew 1157: # "LEFT JOIN $part_table AS c ON c.part_id = a.part_id ".
1.57 matthew 1158: "LEFT JOIN $student_table AS b ON b.student_id = a.student_id ".
1159: "WHERE symb='".$dbh->quote($symb)."'";
1160: }
1161: my $starttime = Time::HiRes::time;
1162: my $rows_retrieved = 0;
1163: my $sth = $dbh->prepare($request);
1164: $sth->execute();
1165: if ($sth->err()) {
1166: &Apache::lonnet::logthis("Unable to execute MySQL request:");
1167: &Apache::lonnet::logthis("\n".$request."\n");
1168: &Apache::lonnet::logthis("error is:".$sth->errstr());
1169: return undef;
1170: }
1171: foreach my $row (@{$sth->fetchall_arrayref}) {
1172: $rows_retrieved++;
1.63 matthew 1173: my ($symb,$part,$solved,$tries,$awarded,$award,$awarddetail,$time) =
1.57 matthew 1174: (@$row);
1175: my $base = 'resource.'.$part;
1176: $studentdata->{$symb}->{$base.'.solved'} = $solved;
1177: $studentdata->{$symb}->{$base.'.tries'} = $tries;
1178: $studentdata->{$symb}->{$base.'.awarded'} = $awarded;
1179: $studentdata->{$symb}->{$base.'.award'} = $award;
1180: $studentdata->{$symb}->{$base.'.awarddetail'} = $awarddetail;
1181: $studentdata->{$symb}->{'timestamp'} = $time if (defined($time) && $time ne '');
1.67 matthew 1182: }
1183: if (defined($symb) && $symb ne '') {
1184: $studentdata = $studentdata->{$symb};
1.57 matthew 1185: }
1186: return $studentdata;
1187: }
1188:
1189: ################################################
1190: ################################################
1191:
1192: =pod
1193:
1194: =item &get_current_state()
1195:
1196: Input: $sname,$sdom,$symb,$courseid
1197:
1198: Output: Described below
1.46 matthew 1199:
1.47 matthew 1200: Retrieve the current status of a students performance. $sname and
1.46 matthew 1201: $sdom are the only required parameters. If $symb is undef the results
1.47 matthew 1202: of an &Apache::lonnet::currentdump() will be returned.
1.46 matthew 1203: If $courseid is undef it will be retrieved from the environment.
1204:
1205: The return structure is based on &Apache::lonnet::currentdump. If
1206: $symb is unspecified, all the students data is returned in a hash of
1207: the form:
1208: (
1209: symb1 => { param1 => value1, param2 => value2 ... },
1210: symb2 => { param1 => value1, param2 => value2 ... },
1211: )
1212:
1213: If $symb is specified, a hash of
1214: (
1215: param1 => value1,
1216: param2 => value2,
1217: )
1218: is returned.
1219:
1.57 matthew 1220: If no data is found for $symb, or if the student has no performance data,
1.46 matthew 1221: an empty list is returned.
1222:
1223: =cut
1224:
1225: ################################################
1226: ################################################
1227: sub get_current_state {
1.47 matthew 1228: my ($sname,$sdom,$symb,$courseid,$forcedownload)=@_;
1229: #
1.46 matthew 1230: $courseid = $ENV{'request.course.id'} if (! defined($courseid));
1.47 matthew 1231: #
1.61 matthew 1232: return () if (! defined($sname) || ! defined($sdom));
1233: #
1.57 matthew 1234: my ($status,$data) = &ensure_current_data($sname,$sdom,$courseid);
1.77 matthew 1235: # &Apache::lonnet::logthis
1236: # ('sname = '.$sname.
1237: # ' domain = '.$sdom.
1238: # ' status = '.$status.
1239: # ' data is '.(defined($data)?'defined':'undefined'));
1.73 matthew 1240: # while (my ($symb,$hash) = each(%$data)) {
1241: # &Apache::lonnet::logthis($symb."\n----------------------------------");
1242: # while (my ($key,$value) = each (%$hash)) {
1243: # &Apache::lonnet::logthis(" ".$key." = ".$value);
1244: # }
1245: # }
1.47 matthew 1246: #
1.79 matthew 1247: if (defined($data) && defined($symb) && ref($data->{$symb})) {
1248: return %{$data->{$symb}};
1249: } elsif (defined($data) && ! defined($symb) && ref($data)) {
1250: return %$data;
1251: }
1252: if ($status eq 'no data') {
1.57 matthew 1253: return ();
1254: } else {
1255: if ($status ne 'okay' && $status ne '') {
1256: &Apache::lonnet::logthis('status = '.$status);
1.47 matthew 1257: return ();
1258: }
1.57 matthew 1259: my $returnhash = &get_student_data_from_performance_cache($sname,$sdom,
1260: $symb,$courseid);
1261: return %$returnhash if (defined($returnhash));
1.46 matthew 1262: }
1.57 matthew 1263: return ();
1.61 matthew 1264: }
1265:
1266: ################################################
1267: ################################################
1268:
1269: =pod
1270:
1271: =item &get_problem_statistics()
1272:
1273: Gather data on a given problem. The database is assumed to be
1274: populated and all local caching variables are assumed to be set
1275: properly. This means you need to call &ensure_current_data for
1276: the students you are concerned with prior to calling this routine.
1277:
1278: Inputs: $students, $symb, $part, $courseid
1279:
1.64 matthew 1280: =over 4
1281:
1282: =item $students is an array of hash references.
1283: Each hash must contain at least the 'username' and 'domain' of a student.
1284:
1285: =item $symb is the symb for the problem.
1286:
1287: =item $part is the part id you need statistics for
1288:
1289: =item $courseid is the course id, of course!
1290:
1291: =back
1292:
1.66 matthew 1293: Outputs: See the code for up to date information. A hash reference is
1294: returned. The hash has the following keys defined:
1.64 matthew 1295:
1296: =over 4
1297:
1.66 matthew 1298: =item num_students The number of students attempting the problem
1299:
1300: =item tries The total number of tries for the students
1301:
1302: =item max_tries The maximum number of tries taken
1303:
1304: =item mean_tries The average number of tries
1305:
1306: =item num_solved The number of students able to solve the problem
1307:
1308: =item num_override The number of students whose answer is 'correct_by_override'
1309:
1310: =item deg_of_diff The degree of difficulty of the problem
1311:
1312: =item std_tries The standard deviation of the number of tries
1313:
1314: =item skew_tries The skew of the number of tries
1.64 matthew 1315:
1.66 matthew 1316: =item per_wrong The number of students attempting the problem who were not
1317: able to answer it correctly.
1.64 matthew 1318:
1319: =back
1320:
1.61 matthew 1321: =cut
1322:
1323: ################################################
1324: ################################################
1325: sub get_problem_statistics {
1326: my ($students,$symb,$part,$courseid) = @_;
1327: return if (! defined($symb) || ! defined($part));
1328: $courseid = $ENV{'request.course.id'} if (! defined($courseid));
1329: #
1330: my $symb_id = &get_symb_id($symb);
1331: my $part_id = &get_part_id($part);
1332: my $stats_table = $courseid.'_problem_stats';
1333: #
1334: my $dbh = &Apache::lonmysql::get_dbh();
1335: return undef if (! defined($dbh));
1336: #
1337: # A) Number of Students attempting problem
1338: # B) Total number of tries of students attempting problem
1339: # C) Mod (largest number of tries for solving the problem)
1340: # D) Mean (average number of tries for solving the problem)
1341: # E) Number of students to solve the problem
1342: # F) Number of students to solve the problem by override
1343: # G) Number of students unable to solve the problem
1344: # H) Degree of difficulty : 1-(E+F)/B
1345: # I) Standard deviation of number of tries
1346: # J) Skew of tries: sqrt(sum(Xi-D)^3)/A
1347: #
1348: $dbh->do('DROP TABLE '.$stats_table); # May return an error
1349: my $request =
1350: 'CREATE TEMPORARY TABLE '.$stats_table.
1351: ' SELECT student_id,solved,award,tries FROM '.$performance_table.
1352: ' WHERE symb_id='.$symb_id.' AND part_id='.$part_id;
1.64 matthew 1353: if (defined($students)) {
1354: $request .= ' AND ('.
1355: join(' OR ', map {'student_id='.
1356: &get_student_id($_->{'username'},
1357: $_->{'domain'})
1358: } @$students
1359: ).')';
1360: }
1.61 matthew 1361: # &Apache::lonnet::logthis($request);
1362: $dbh->do($request);
1363: my ($num,$tries,$mod,$mean,$STD) = &execute_SQL_request
1364: ($dbh,
1365: 'SELECT COUNT(*),SUM(tries),MAX(tries),AVG(tries),STD(tries) FROM '.
1366: $stats_table);
1367: my ($Solved) = &execute_SQL_request($dbh,'SELECT COUNT(tries) FROM '.
1368: $stats_table.
1369: " WHERE solved='correct_by_student'");
1370: my ($solved) = &execute_SQL_request($dbh,'SELECT COUNT(tries) FROM '.
1371: $stats_table.
1372: " WHERE solved='correct_by_override'");
1373: $num = 0 if (! defined($num));
1374: $tries = 0 if (! defined($tries));
1375: $mod = 0 if (! defined($mod));
1376: $STD = 0 if (! defined($STD));
1377: $Solved = 0 if (! defined($Solved));
1378: $solved = 0 if (! defined($solved));
1379: #
1380: my $DegOfDiff = 'nan';
1.66 matthew 1381: $DegOfDiff = 1-($Solved)/$tries if ($tries>0);
1.61 matthew 1382:
1383: my $SKEW = 'nan';
1.66 matthew 1384: my $wrongpercent = 0;
1.61 matthew 1385: if ($num > 0) {
1386: ($SKEW) = &execute_SQL_request($dbh,'SELECT SQRT(SUM('.
1387: 'POWER(tries - '.$STD.',3)'.
1388: '))/'.$num.' FROM '.$stats_table);
1.66 matthew 1389: $wrongpercent=int(10*100*($num-$Solved+$solved)/$num)/10;
1.61 matthew 1390: }
1391: #
1392: $dbh->do('DROP TABLE '.$stats_table); # May return an error
1.81 matthew 1393: #
1394: # Store in metadata
1395: #
1.80 www 1396: if ($num) {
1397: my %storestats=();
1398:
1.86 www 1399: my $urlres=(&Apache::lonnet::decode_symb($symb))[2];
1.80 www 1400:
1401: $storestats{$courseid.'___'.$urlres.'___timestamp'}=time;
1402: $storestats{$courseid.'___'.$urlres.'___stdno'}=$num;
1403: $storestats{$courseid.'___'.$urlres.'___avetries'}=$mean;
1404: $storestats{$courseid.'___'.$urlres.'___difficulty'}=$DegOfDiff;
1405:
1406: $urlres=~/^(\w+)\/(\w+)/;
1407: &Apache::lonnet::put('nohist_resevaldata',\%storestats,$1,$2);
1408: }
1.81 matthew 1409: #
1410: # Return result
1411: #
1.66 matthew 1412: return { num_students => $num,
1413: tries => $tries,
1414: max_tries => $mod,
1415: mean_tries => $mean,
1416: std_tries => $STD,
1417: skew_tries => $SKEW,
1418: num_solved => $Solved,
1419: num_override => $solved,
1420: per_wrong => $wrongpercent,
1.81 matthew 1421: deg_of_diff => $DegOfDiff };
1.61 matthew 1422: }
1423:
1424: sub execute_SQL_request {
1425: my ($dbh,$request)=@_;
1426: # &Apache::lonnet::logthis($request);
1427: my $sth = $dbh->prepare($request);
1428: $sth->execute();
1429: my $row = $sth->fetchrow_arrayref();
1430: if (ref($row) eq 'ARRAY' && scalar(@$row)>0) {
1431: return @$row;
1432: }
1433: return ();
1434: }
1435:
1436:
1437: ################################################
1438: ################################################
1439:
1440: =pod
1441:
1442: =item &setup_table_names()
1443:
1444: input: course id
1445:
1446: output: none
1447:
1448: Cleans up the package variables for local caching.
1449:
1450: =cut
1451:
1452: ################################################
1453: ################################################
1454: sub setup_table_names {
1455: my ($courseid) = @_;
1456: if (! defined($courseid)) {
1457: $courseid = $ENV{'request.course.id'};
1458: }
1459: #
1460: if (! defined($current_course) || $current_course ne $courseid) {
1461: # Clear out variables
1462: $have_read_part_table = 0;
1463: undef(%ids_by_part);
1464: undef(%parts_by_id);
1465: $have_read_symb_table = 0;
1466: undef(%ids_by_symb);
1467: undef(%symbs_by_id);
1468: $have_read_student_table = 0;
1469: undef(%ids_by_student);
1470: undef(%students_by_id);
1471: #
1472: $current_course = $courseid;
1473: }
1474: #
1475: # Set up database names
1476: my $base_id = $courseid;
1477: $symb_table = $base_id.'_'.'symb';
1478: $part_table = $base_id.'_'.'part';
1479: $student_table = $base_id.'_'.'student';
1.87 ! matthew 1480: $studentdata_table = $base_id.'_'.'studentdata';
1.61 matthew 1481: $performance_table = $base_id.'_'.'performance';
1482: $parameters_table = $base_id.'_'.'parameters';
1483: return;
1.3 stredwic 1484: }
1.1 stredwic 1485:
1.35 matthew 1486: ################################################
1487: ################################################
1488:
1489: =pod
1490:
1.57 matthew 1491: =back
1492:
1493: =item End of Local Data Caching Subroutines
1494:
1495: =cut
1496:
1497: ################################################
1498: ################################################
1499:
1500:
1501: }
1502: ################################################
1503: ################################################
1504:
1505: =pod
1506:
1507: =head3 Classlist Subroutines
1508:
1.35 matthew 1509: =item &get_classlist();
1510:
1511: Retrieve the classist of a given class or of the current class. Student
1512: information is returned from the classlist.db file and, if needed,
1513: from the students environment.
1514:
1515: Optional arguments are $cid, $cdom, and $cnum (course id, course domain,
1516: and course number, respectively). Any omitted arguments will be taken
1517: from the current environment ($ENV{'request.course.id'},
1518: $ENV{'course.'.$cid.'.domain'}, and $ENV{'course.'.$cid.'.num'}).
1519:
1520: Returns a reference to a hash which contains:
1521: keys '$sname:$sdom'
1.54 bowersj2 1522: values [$sdom,$sname,$end,$start,$id,$section,$fullname,$status]
1523:
1524: The constant values CL_SDOM, CL_SNAME, CL_END, etc. can be used
1525: as indices into the returned list to future-proof clients against
1526: changes in the list order.
1.35 matthew 1527:
1528: =cut
1529:
1530: ################################################
1531: ################################################
1.54 bowersj2 1532:
1533: sub CL_SDOM { return 0; }
1534: sub CL_SNAME { return 1; }
1535: sub CL_END { return 2; }
1536: sub CL_START { return 3; }
1537: sub CL_ID { return 4; }
1538: sub CL_SECTION { return 5; }
1539: sub CL_FULLNAME { return 6; }
1540: sub CL_STATUS { return 7; }
1.35 matthew 1541:
1542: sub get_classlist {
1543: my ($cid,$cdom,$cnum) = @_;
1544: $cid = $cid || $ENV{'request.course.id'};
1545: $cdom = $cdom || $ENV{'course.'.$cid.'.domain'};
1546: $cnum = $cnum || $ENV{'course.'.$cid.'.num'};
1.57 matthew 1547: my $now = time;
1.35 matthew 1548: #
1549: my %classlist=&Apache::lonnet::dump('classlist',$cdom,$cnum);
1550: while (my ($student,$info) = each(%classlist)) {
1.60 matthew 1551: if ($student =~ /^(con_lost|error|no_such_host)/i) {
1552: &Apache::lonnet::logthis('get_classlist error for '.$cid.':'.$student);
1553: return undef;
1554: }
1.35 matthew 1555: my ($sname,$sdom) = split(/:/,$student);
1556: my @Values = split(/:/,$info);
1557: my ($end,$start,$id,$section,$fullname);
1558: if (@Values > 2) {
1559: ($end,$start,$id,$section,$fullname) = @Values;
1560: } else { # We have to get the data ourselves
1561: ($end,$start) = @Values;
1.37 matthew 1562: $section = &Apache::lonnet::getsection($sdom,$sname,$cid);
1.35 matthew 1563: my %info=&Apache::lonnet::get('environment',
1564: ['firstname','middlename',
1565: 'lastname','generation','id'],
1566: $sdom, $sname);
1567: my ($tmp) = keys(%info);
1568: if ($tmp =~/^(con_lost|error|no_such_host)/i) {
1569: $fullname = 'not available';
1570: $id = 'not available';
1.38 matthew 1571: &Apache::lonnet::logthis('unable to retrieve environment '.
1572: 'for '.$sname.':'.$sdom);
1.35 matthew 1573: } else {
1574: $fullname = &ProcessFullName(@info{qw/lastname generation
1575: firstname middlename/});
1576: $id = $info{'id'};
1577: }
1.36 matthew 1578: # Update the classlist with this students information
1579: if ($fullname ne 'not available') {
1580: my $enrolldata = join(':',$end,$start,$id,$section,$fullname);
1581: my $reply=&Apache::lonnet::cput('classlist',
1582: {$student => $enrolldata},
1583: $cdom,$cnum);
1584: if ($reply !~ /^(ok|delayed)/) {
1585: &Apache::lonnet::logthis('Unable to update classlist for '.
1586: 'student '.$sname.':'.$sdom.
1587: ' error:'.$reply);
1588: }
1589: }
1.35 matthew 1590: }
1591: my $status='Expired';
1592: if(((!$end) || $now < $end) && ((!$start) || ($now > $start))) {
1593: $status='Active';
1594: }
1595: $classlist{$student} =
1596: [$sdom,$sname,$end,$start,$id,$section,$fullname,$status];
1597: }
1598: if (wantarray()) {
1599: return (\%classlist,['domain','username','end','start','id',
1600: 'section','fullname','status']);
1601: } else {
1602: return \%classlist;
1603: }
1604: }
1605:
1.1 stredwic 1606: # ----- END HELPER FUNCTIONS --------------------------------------------
1607:
1608: 1;
1609: __END__
1.36 matthew 1610:
1.35 matthew 1611:
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