1: # The LearningOnline Network with CAPA
2: #
3: # $Id: loncoursedata.pm,v 1.201 2016/08/16 00:46:58 raeburn Exp $
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: =pod
29:
30: =head1 NAME
31:
32: Apache::loncoursedata
33:
34: =head1 SYNOPSIS
35:
36: Set of functions that download and process student and course information.
37:
38: =head1 PACKAGES USED
39:
40: Apache::lonnet
41: Apache::longroup
42: Time::HiRes
43: Apache::lonmysql
44: LONCAPA
45: Digest::MD5
46:
47: =cut
48:
49: package Apache::loncoursedata;
50:
51: use strict;
52: use Apache::lonnet;
53: use Apache::longroup();
54: use Time::HiRes();
55: use Apache::lonmysql();
56: use LONCAPA;
57: use Digest::MD5();
58:
59: =pod
60:
61: =head2 make_into_hash
62:
63: Turn a colon separated string into a hash and return a reference
64: to it. Numbering from 0 even elements are keys and odd elements
65: are values e.g. a:b:c:d creates a hash like
66: a => b, c =>d
67:
68: =cut
69:
70: sub make_into_hash {
71: my $values = shift;
72: my %tmp = map { &unescape($_); } split(':',$values);
73: return \%tmp;
74: }
75:
76:
77: { # Begin scope of table identifiers
78:
79: my $current_course ='';
80: my $symb_table;
81: my $part_table;
82: my $student_table;
83: my $groupnames_table;
84: my $students_groups_table;
85: my $performance_table;
86: my $parameters_table;
87: my $fulldump_response_table;
88: my $fulldump_part_table;
89: my $fulldump_timestamp_table;
90: my $weight_table;
91:
92: my @Tables;
93:
94:
95:
96: sub init_dbs {
97: my ($courseid,$drop) = @_;
98: &setup_table_names($courseid);
99: #
100: # Drop any of the existing tables
101: if ($drop) {
102: foreach my $table (@Tables) {
103: &Apache::lonmysql::drop_table($table);
104: }
105: }
106: #
107: # Note - changes to this table must be reflected in the code that
108: # stores the data (calls &Apache::lonmysql::store_row with this table
109: # id
110: my $symb_table_def = {
111: id => $symb_table,
112: permanent => 'no',
113: columns => [{ name => 'symb_id',
114: type => 'MEDIUMINT UNSIGNED',
115: restrictions => 'NOT NULL',
116: auto_inc => 'yes', },
117: { name => 'symb',
118: type => 'MEDIUMTEXT',
119: restrictions => 'NOT NULL'},
120: ],
121: 'PRIMARY KEY' => ['symb_id'],
122: };
123: #
124: my $part_table_def = {
125: id => $part_table,
126: permanent => 'no',
127: columns => [{ name => 'part_id',
128: type => 'MEDIUMINT UNSIGNED',
129: restrictions => 'NOT NULL',
130: auto_inc => 'yes', },
131: { name => 'part',
132: type => 'VARCHAR(100) BINARY',
133: restrictions => 'NOT NULL'},
134: ],
135: 'PRIMARY KEY' => ['part (100)'],
136: 'KEY' => [{ columns => ['part_id']},],
137: };
138: #
139: my $student_table_def = {
140: id => $student_table,
141: permanent => 'no',
142: columns => [{ name => 'student_id',
143: type => 'MEDIUMINT UNSIGNED',
144: restrictions => 'NOT NULL',
145: auto_inc => 'yes', },
146: { name => 'student',
147: type => 'VARCHAR(100) BINARY',
148: restrictions => 'NOT NULL UNIQUE'},
149: { name => 'section',
150: type => 'VARCHAR(100) BINARY',
151: restrictions => 'NOT NULL'},
152: { name => 'start',
153: type => 'INT',
154: restrictions => 'NOT NULL'},
155: { name => 'end',
156: type => 'INT',
157: restrictions => 'NOT NULL'},
158: { name => 'classification',
159: type => 'VARCHAR(100) BINARY', },
160: { name => 'updatetime',
161: type => 'INT UNSIGNED'},
162: { name => 'fullupdatetime',
163: type => 'INT UNSIGNED'},
164: ],
165: 'PRIMARY KEY' => ['student_id'],
166: 'KEY' => [{ columns => ['student (100)',
167: 'section (100)',
168: 'start',
169: 'end']},],
170: };
171: #
172: my $groupnames_table_def = {
173: id => $groupnames_table,
174: permanent => 'no',
175: columns => [{ name => 'group_id',
176: type => 'MEDIUMINT UNSIGNED',
177: restrictions => 'NOT NULL',
178: auto_inc => 'yes', },
179: { name => 'groupname',
180: type => 'VARCHAR(100) BINARY',
181: restrictions => 'NOT NULL UNIQUE'},
182: ],
183: 'PRIMARY KEY' => ['group_id'],
184: 'KEY' => [{ columns => ['groupname (100)',]},],
185: };
186: #
187: my $students_groups_table_def = {
188: id => $students_groups_table,
189: permanent => 'no',
190: columns => [{ name => 'student_id',
191: type => 'MEDIUMINT UNSIGNED',
192: restrictions => 'NOT NULL', },
193: { name => 'group_id',
194: type => 'MEDIUMINT UNSIGNED',
195: restrictions => 'NOT NULL', },
196: ],
197: 'PRIMARY KEY' => ['student_id','group_id'],
198: 'KEY' => [{ columns => ['student_id'] },
199: { columns => ['group_id'] },],
200: };
201: #
202: my $performance_table_def = {
203: id => $performance_table,
204: permanent => 'no',
205: columns => [{ name => 'symb_id',
206: type => 'MEDIUMINT UNSIGNED',
207: restrictions => 'NOT NULL' },
208: { name => 'student_id',
209: type => 'MEDIUMINT UNSIGNED',
210: restrictions => 'NOT NULL' },
211: { name => 'part_id',
212: type => 'MEDIUMINT UNSIGNED',
213: restrictions => 'NOT NULL' },
214: { name => 'part',
215: type => 'VARCHAR(100) BINARY',
216: restrictions => 'NOT NULL'},
217: { name => 'solved',
218: type => 'TINYTEXT' },
219: { name => 'tries',
220: type => 'SMALLINT UNSIGNED' },
221: { name => 'awarded',
222: type => 'REAL' },
223: { name => 'award',
224: type => 'TINYTEXT' },
225: { name => 'awarddetail',
226: type => 'TINYTEXT' },
227: { name => 'timestamp',
228: type => 'INT UNSIGNED'},
229: ],
230: 'PRIMARY KEY' => ['symb_id','student_id','part_id'],
231: 'KEY' => [{ columns=>['student_id'] },
232: { columns=>['symb_id'] },],
233: };
234: #
235: my $fulldump_part_table_def = {
236: id => $fulldump_part_table,
237: permanent => 'no',
238: columns => [
239: { name => 'symb_id',
240: type => 'MEDIUMINT UNSIGNED',
241: restrictions => 'NOT NULL' },
242: { name => 'part_id',
243: type => 'MEDIUMINT UNSIGNED',
244: restrictions => 'NOT NULL' },
245: { name => 'student_id',
246: type => 'MEDIUMINT UNSIGNED',
247: restrictions => 'NOT NULL' },
248: { name => 'transaction',
249: type => 'MEDIUMINT UNSIGNED',
250: restrictions => 'NOT NULL' },
251: { name => 'tries',
252: type => 'SMALLINT UNSIGNED',
253: restrictions => 'NOT NULL' },
254: { name => 'award',
255: type => 'TINYTEXT' },
256: { name => 'awarded',
257: type => 'REAL' },
258: { name => 'previous',
259: type => 'SMALLINT UNSIGNED' },
260: # { name => 'regrader',
261: # type => 'TINYTEXT' },
262: # { name => 'afterduedate',
263: # type => 'TINYTEXT' },
264: ],
265: 'PRIMARY KEY' => ['symb_id','part_id','student_id','transaction'],
266: 'KEY' => [
267: { columns=>['symb_id'] },
268: { columns=>['part_id'] },
269: { columns=>['student_id'] },
270: ],
271: };
272: #
273: my $fulldump_response_table_def = {
274: id => $fulldump_response_table,
275: permanent => 'no',
276: columns => [
277: { name => 'symb_id',
278: type => 'MEDIUMINT UNSIGNED',
279: restrictions => 'NOT NULL' },
280: { name => 'part_id',
281: type => 'MEDIUMINT UNSIGNED',
282: restrictions => 'NOT NULL' },
283: { name => 'response_id',
284: type => 'MEDIUMINT UNSIGNED',
285: restrictions => 'NOT NULL' },
286: { name => 'student_id',
287: type => 'MEDIUMINT UNSIGNED',
288: restrictions => 'NOT NULL' },
289: { name => 'transaction',
290: type => 'MEDIUMINT UNSIGNED',
291: restrictions => 'NOT NULL' },
292: { name => 'awarddetail',
293: type => 'TINYTEXT' },
294: # { name => 'message',
295: # type => 'CHAR BINARY'},
296: { name => 'response_specific',
297: type => 'TINYTEXT' },
298: { name => 'response_specific_value',
299: type => 'TINYTEXT' },
300: { name => 'response_specific_2',
301: type => 'TINYTEXT' },
302: { name => 'response_specific_value_2',
303: type => 'TINYTEXT' },
304: { name => 'submission',
305: type => 'TEXT'},
306: ],
307: 'PRIMARY KEY' => ['symb_id','part_id','response_id','student_id',
308: 'transaction'],
309: 'KEY' => [
310: { columns=>['symb_id'] },
311: { columns=>['part_id','response_id'] },
312: { columns=>['student_id'] },
313: ],
314: };
315: my $fulldump_timestamp_table_def = {
316: id => $fulldump_timestamp_table,
317: permanent => 'no',
318: columns => [
319: { name => 'symb_id',
320: type => 'MEDIUMINT UNSIGNED',
321: restrictions => 'NOT NULL' },
322: { name => 'student_id',
323: type => 'MEDIUMINT UNSIGNED',
324: restrictions => 'NOT NULL' },
325: { name => 'transaction',
326: type => 'MEDIUMINT UNSIGNED',
327: restrictions => 'NOT NULL' },
328: { name => 'timestamp',
329: type => 'INT UNSIGNED'},
330: ],
331: 'PRIMARY KEY' => ['symb_id','student_id','transaction'],
332: 'KEY' => [
333: { columns=>['symb_id'] },
334: { columns=>['student_id'] },
335: { columns=>['transaction'] },
336: ],
337: };
338: #
339: my $parameters_table_def = {
340: id => $parameters_table,
341: permanent => 'no',
342: columns => [{ name => 'symb_id',
343: type => 'MEDIUMINT UNSIGNED',
344: restrictions => 'NOT NULL' },
345: { name => 'student_id',
346: type => 'MEDIUMINT UNSIGNED',
347: restrictions => 'NOT NULL' },
348: { name => 'parameter',
349: type => 'TINYTEXT',
350: restrictions => 'NOT NULL' },
351: { name => 'value',
352: type => 'MEDIUMTEXT' },
353: ],
354: 'PRIMARY KEY' => ['symb_id','student_id','parameter (255)'],
355: };
356: #
357: my $weight_table_def = {
358: id => $weight_table,
359: permanent => 'no',
360: columns => [{ name => 'symb_id',
361: type => 'MEDIUMINT UNSIGNED',
362: restrictions => 'NOT NULL' },
363: { name => 'part_id',
364: type => 'MEDIUMINT UNSIGNED',
365: restrictions => 'NOT NULL' },
366: { name => 'weight',
367: type => 'REAL',
368: restrictions => 'NOT NULL' },
369: ],
370: 'PRIMARY KEY' => ['symb_id','part_id'],
371: };
372: #
373: # Create the tables
374: my $tableid;
375: $tableid = &Apache::lonmysql::create_table($symb_table_def);
376: if (! defined($tableid)) {
377: &Apache::lonnet::logthis("error creating symb_table: ".
378: &Apache::lonmysql::get_error());
379: return 1;
380: }
381: #
382: $tableid = &Apache::lonmysql::create_table($part_table_def);
383: if (! defined($tableid)) {
384: &Apache::lonnet::logthis("error creating part_table: ".
385: &Apache::lonmysql::get_error());
386: return 2;
387: }
388: #
389: $tableid = &Apache::lonmysql::create_table($student_table_def);
390: if (! defined($tableid)) {
391: &Apache::lonnet::logthis("error creating student_table: ".
392: &Apache::lonmysql::get_error());
393: return 3;
394: }
395: #
396: $tableid = &Apache::lonmysql::create_table($performance_table_def);
397: if (! defined($tableid)) {
398: &Apache::lonnet::logthis("error creating preformance_table: ".
399: &Apache::lonmysql::get_error());
400: return 5;
401: }
402: #
403: $tableid = &Apache::lonmysql::create_table($parameters_table_def);
404: if (! defined($tableid)) {
405: &Apache::lonnet::logthis("error creating parameters_table: ".
406: &Apache::lonmysql::get_error());
407: return 6;
408: }
409: #
410: $tableid = &Apache::lonmysql::create_table($fulldump_part_table_def);
411: if (! defined($tableid)) {
412: &Apache::lonnet::logthis("error creating fulldump_part_table: ".
413: &Apache::lonmysql::get_error());
414: return 7;
415: }
416: #
417: $tableid = &Apache::lonmysql::create_table($fulldump_response_table_def);
418: if (! defined($tableid)) {
419: &Apache::lonnet::logthis("error creating fulldump_response_table: ".
420: &Apache::lonmysql::get_error());
421: return 8;
422: }
423: $tableid = &Apache::lonmysql::create_table($fulldump_timestamp_table_def);
424: if (! defined($tableid)) {
425: &Apache::lonnet::logthis("error creating fulldump_timestamp_table: ".
426: &Apache::lonmysql::get_error());
427: return 9;
428: }
429: $tableid = &Apache::lonmysql::create_table($weight_table_def);
430: if (! defined($tableid)) {
431: &Apache::lonnet::logthis("error creating weight_table: ".
432: &Apache::lonmysql::get_error());
433: return 10;
434: }
435: $tableid = &Apache::lonmysql::create_table($groupnames_table_def);
436: if (! defined($tableid)) {
437: &Apache::lonnet::logthis("error creating groupnames_table: ".
438: &Apache::lonmysql::get_error());
439: return 11;
440: }
441: $tableid = &Apache::lonmysql::create_table($students_groups_table_def);
442: if (! defined($tableid)) {
443: &Apache::lonnet::logthis("error creating student_groups_table: ".
444: &Apache::lonmysql::get_error());
445: return 12;
446: }
447: return 0;
448: }
449:
450: =pod
451:
452: =head2 delete_caches
453:
454: Drops all of the tables in the local mysql cache associated with the
455: specified course id.
456:
457: TODO: The drops should be pushed into lonmysql to further isolate
458: mysql code from other modules.
459:
460: =cut
461: sub delete_caches {
462: my $courseid = shift;
463: $courseid = $env{'request.course.id'} if (! defined($courseid));
464: #
465: &setup_table_names($courseid);
466: #
467: my $dbh = &Apache::lonmysql::get_dbh();
468: foreach my $table (@Tables) {
469: my $command = 'DROP TABLE '.$table.';';
470: $dbh->do($command);
471: if ($dbh->err) {
472: &Apache::lonnet::logthis($command.' resulted in error: '.$dbh->errstr);
473: }
474: }
475: return;
476: }
477:
478:
479: my $have_read_part_table = 0;
480: my %ids_by_part;
481: my %parts_by_id;
482:
483: sub get_part_id {
484: my ($part) = @_;
485: $part = 0 if (! defined($part));
486: if (! $have_read_part_table) {
487: my @Result = &Apache::lonmysql::get_rows($part_table);
488: foreach (@Result) {
489: $ids_by_part{$_->[1]}=$_->[0];
490: }
491: $have_read_part_table = 1;
492: }
493: if (! exists($ids_by_part{$part})) {
494: &Apache::lonmysql::store_row($part_table,[undef,$part]);
495: undef(%ids_by_part);
496: my @Result = &Apache::lonmysql::get_rows($part_table);
497: foreach (@Result) {
498: $ids_by_part{$_->[1]}=$_->[0];
499: }
500: }
501: return $ids_by_part{$part} if (exists($ids_by_part{$part}));
502: return undef; # error
503: }
504:
505: sub get_part {
506: my ($part_id) = @_;
507: if (! exists($parts_by_id{$part_id}) ||
508: ! defined($parts_by_id{$part_id}) ||
509: $parts_by_id{$part_id} eq '') {
510: my @Result = &Apache::lonmysql::get_rows($part_table);
511: foreach (@Result) {
512: $parts_by_id{$_->[0]}=$_->[1];
513: }
514: }
515: return $parts_by_id{$part_id} if(exists($parts_by_id{$part_id}));
516: return undef; # error
517: }
518:
519:
520: my $have_read_symb_table = 0;
521: my %ids_by_symb;
522: my %symbs_by_id;
523:
524: sub get_symb_id {
525: my ($symb) = @_;
526: if (! $have_read_symb_table) {
527: my @Result = &Apache::lonmysql::get_rows($symb_table);
528: foreach (@Result) {
529: $ids_by_symb{$_->[1]}=$_->[0];
530: }
531: $have_read_symb_table = 1;
532: }
533: if (! exists($ids_by_symb{$symb})) {
534: &Apache::lonmysql::store_row($symb_table,[undef,$symb]);
535: undef(%ids_by_symb);
536: my @Result = &Apache::lonmysql::get_rows($symb_table);
537: foreach (@Result) {
538: $ids_by_symb{$_->[1]}=$_->[0];
539: }
540: }
541: return $ids_by_symb{$symb} if(exists( $ids_by_symb{$symb}));
542: return undef; # error
543: }
544:
545: sub get_symb {
546: my ($symb_id) = @_;
547: if (! exists($symbs_by_id{$symb_id}) ||
548: ! defined($symbs_by_id{$symb_id}) ||
549: $symbs_by_id{$symb_id} eq '') {
550: my @Result = &Apache::lonmysql::get_rows($symb_table);
551: foreach (@Result) {
552: $symbs_by_id{$_->[0]}=$_->[1];
553: }
554: }
555: return $symbs_by_id{$symb_id} if(exists( $symbs_by_id{$symb_id}));
556: return undef; # error
557: }
558:
559: my $have_read_student_table = 0;
560: my %ids_by_student;
561: my %students_by_id;
562:
563: sub get_student_id {
564: my ($sname,$sdom) = @_;
565: my $student = $sname.':'.$sdom;
566: if (! $have_read_student_table) {
567: my @Result = &Apache::lonmysql::get_rows($student_table);
568: foreach (@Result) {
569: $ids_by_student{$_->[1]}=$_->[0];
570: }
571: $have_read_student_table = 1;
572: }
573: if (! exists($ids_by_student{$student})) {
574: &populate_student_table();
575: undef(%ids_by_student);
576: undef(%students_by_id);
577: my @Result = &Apache::lonmysql::get_rows($student_table);
578: foreach (@Result) {
579: $ids_by_student{$_->[1]}=$_->[0];
580: }
581: }
582: return $ids_by_student{$student} if(exists( $ids_by_student{$student}));
583: return undef; # error
584: }
585:
586: sub get_student {
587: my ($student_id) = @_;
588: if (! exists($students_by_id{$student_id}) ||
589: ! defined($students_by_id{$student_id}) ||
590: $students_by_id{$student_id} eq '') {
591: my @Result = &Apache::lonmysql::get_rows($student_table);
592: foreach (@Result) {
593: $students_by_id{$_->[0]}=$_->[1];
594: }
595: }
596: return $students_by_id{$student_id} if(exists($students_by_id{$student_id}));
597: return undef; # error
598: }
599:
600: sub populate_student_table {
601: my ($courseid) = @_;
602: if (! defined($courseid)) {
603: $courseid = $env{'request.course.id'};
604: }
605: #
606: &setup_table_names($courseid);
607: &init_dbs($courseid,0);
608: my $dbh = &Apache::lonmysql::get_dbh();
609: my $request = 'INSERT IGNORE INTO '.$student_table.
610: "(student,section,start,end) VALUES ";
611: my $cdom = $env{'course.'.$courseid.'.domain'};
612: my $cnum = $env{'course.'.$courseid.'.num'};
613: my $classlist = &get_classlist($cdom,$cnum);
614: my $student_count=0;
615: while (my ($student,$data) = each %$classlist) {
616: my ($section,$start,$end) = ($data->[&CL_SECTION()],
617: $data->[&CL_START()],
618: $data->[&CL_END()]);
619: if ($section eq '' || $section =~ /^\s*$/) {
620: $section = 'none';
621: }
622: if (!defined($start)) { $start = 0; }
623: if (!defined($end)) { $end = 0; }
624: $request .= "('".$student."','".$section."','".$start."','".$end."'),";
625: $student_count++;
626: }
627: return if ($student_count == 0);
628: chop($request);
629: $dbh->do($request);
630: if ($dbh->err()) {
631: &Apache::lonnet::logthis("error ".$dbh->errstr().
632: " occurred executing \n".
633: $request);
634: }
635: return;
636: }
637:
638: my $have_read_groupnames_table = 0;
639: my %ids_by_groupname;
640:
641: sub get_group_id {
642: my ($groupname) = @_;
643: if (! $have_read_groupnames_table) {
644: my @Result = &Apache::lonmysql::get_rows($groupnames_table);
645: foreach (@Result) {
646: $ids_by_groupname{$_->[1]}=$_->[0];
647: }
648: $have_read_groupnames_table = 1;
649: }
650: if (! exists($ids_by_groupname{$groupname})) {
651: &populate_groupnames_table();
652: undef(%ids_by_groupname);
653: my @Result = &Apache::lonmysql::get_rows($groupnames_table);
654: foreach (@Result) {
655: $ids_by_groupname{$_->[1]}=$_->[0];
656: }
657: }
658: if (exists($ids_by_groupname{$groupname})) {
659: return $ids_by_groupname{$groupname};
660: }
661: return undef; # error
662: }
663:
664: sub populate_groupnames_table {
665: my ($courseid) = @_;
666: if (! defined($courseid)) {
667: $courseid = $env{'request.course.id'};
668: }
669: &setup_table_names($courseid);
670: &init_dbs($courseid,0);
671: my $dbh = &Apache::lonmysql::get_dbh();
672: my $cdom = $env{'course.'.$courseid.'.domain'};
673: my $cnum = $env{'course.'.$courseid.'.num'};
674: my %curr_groups = &Apache::longroup::coursegroups($cdom,$cnum);
675: return if (!%curr_groups);
676: my $request = 'INSERT IGNORE INTO '.$groupnames_table.
677: '(groupname) VALUES ';
678: foreach my $groupname (sort(keys(%curr_groups)),'none') {
679: $request .= "('".$groupname."'),";
680: }
681: chop($request);
682: $dbh->do($request);
683: if ($dbh->err()) {
684: &Apache::lonnet::logthis("error ".$dbh->errstr().
685: " occurred executing \n".
686: $request);
687: }
688: return;
689: }
690:
691: my $have_read_studentsgroups_table = 0;
692: my %groupids_by_studentid;
693:
694: sub get_students_groupids {
695: my ($student_id) = @_;
696: if (! $have_read_studentsgroups_table) {
697: my @Result = &Apache::lonmysql::get_rows($students_groups_table);
698: foreach (@Result) {
699: push(@{$groupids_by_studentid{$_->[0]}},$_->[1]);
700: }
701: $have_read_studentsgroups_table = 1;
702: }
703: if (! exists($groupids_by_studentid{$student_id})) {
704: &populate_students_groups_table();
705: undef(%groupids_by_studentid);
706: my @Result = &Apache::lonmysql::get_rows($students_groups_table);
707: foreach (@Result) {
708: push(@{$groupids_by_studentid{$_->[0]}},$_->[1]);
709: }
710: }
711: if (exists($groupids_by_studentid{$student_id})) {
712: if (ref($groupids_by_studentid{$student_id}) eq 'ARRAY') {
713: return @{$groupids_by_studentid{$student_id}};
714: }
715: }
716: return undef; # error
717: }
718:
719:
720: sub populate_students_groups_table {
721: my ($courseid) = @_;
722: if (! defined($courseid)) {
723: $courseid = $env{'request.course.id'};
724: }
725: #
726: &setup_table_names($courseid);
727: &init_dbs($courseid,0);
728: my $dbh = &Apache::lonmysql::get_dbh();
729: my $request = 'INSERT IGNORE INTO '.$students_groups_table.
730: "(student_id,group_id) VALUES ";
731: my $cdom = $env{'course.'.$courseid.'.domain'};
732: my $cnum = $env{'course.'.$courseid.'.num'};
733: my ($classlist,$keylist) = &get_classlist($cdom,$cnum);
734: my ($classgroups,$studentgroups) = &get_group_memberships($classlist,
735: $keylist,
736: $cdom,$cnum);
737: my $record_count = 0;
738: foreach my $student (sort(keys(%{$classgroups}))) {
739: my $student_id = &get_student_id(split(':',$student));
740: my @studentsgroups = &get_students_groups($student,'Active',$classgroups);
741: if (@studentsgroups < 1) {
742: @studentsgroups = ('none');
743: }
744: foreach my $groupname (@studentsgroups) {
745: my $group_id = &get_group_id($groupname);
746: $request .= "('".$student_id."','".$group_id."'),";
747: $record_count++;
748: }
749: }
750: return if ($record_count == 0);
751: chop($request);
752: $dbh->do($request);
753: if ($dbh->err()) {
754: &Apache::lonnet::logthis("error ".$dbh->errstr().
755: " occurred executing \n".
756: $request);
757: }
758: return;
759: }
760:
761: sub clear_internal_caches {
762: $have_read_part_table = 0;
763: undef(%ids_by_part);
764: undef(%parts_by_id);
765: $have_read_symb_table = 0;
766: undef(%ids_by_symb);
767: undef(%symbs_by_id);
768: $have_read_student_table = 0;
769: undef(%ids_by_student);
770: undef(%students_by_id);
771: $have_read_groupnames_table = 0;
772: undef(%ids_by_groupname);
773: }
774:
775: sub symb_is_for_task {
776: my ($symb) = @_;
777: return ($symb =~ /\.task$/);
778: }
779:
780:
781: sub update_full_student_data {
782: my ($sname,$sdom,$courseid) = @_;
783: #
784: # Set up database names
785: &setup_table_names($courseid);
786: #
787: my $student_id = &get_student_id($sname,$sdom);
788: my $student = $sname.':'.$sdom;
789: #
790: my $returnstatus = 'okay';
791: #
792: # Download students data
793: my $time_of_retrieval = time;
794: my @tmp = &Apache::lonnet::dumpstore($courseid,$sdom,$sname);
795: if (@tmp && $tmp[0] =~ /^error/) {
796: $returnstatus = 'error retrieving full student data';
797: return $returnstatus;
798: } elsif (! @tmp) {
799: $returnstatus = 'okay: no student data';
800: return $returnstatus;
801: }
802: my %studentdata = @tmp;
803: #
804: # Get database handle and clean out the tables
805: my $dbh = &Apache::lonmysql::get_dbh();
806: $dbh->do('DELETE FROM '.$fulldump_response_table.' WHERE student_id='.
807: $student_id);
808: $dbh->do('DELETE FROM '.$fulldump_part_table.' WHERE student_id='.
809: $student_id);
810: $dbh->do('DELETE FROM '.$fulldump_timestamp_table.' WHERE student_id='.
811: $student_id);
812: #
813: # Parse and store the data into a form we can handle
814: my $partdata;
815: my $respdata;
816: while (my ($key,$value) = each(%studentdata)) {
817: next if ($key =~ /^(\d+):(resource$|subnum$|keys:)/);
818: my ($transaction,$symb,$parameter) = split(':',$key);
819: $symb = &unescape($symb);
820: $parameter = &unescape($parameter);
821: my $symb_id = &get_symb_id($symb);
822: if ($parameter eq 'timestamp') {
823: # We can deal with 'timestamp' right away
824: my @timestamp_storage = ($symb_id,$student_id,
825: $transaction,$value);
826: my $store_command = 'INSERT IGNORE INTO '.$fulldump_timestamp_table.
827: " VALUES ('".join("','",@timestamp_storage)."');";
828: $dbh->do($store_command);
829: if ($dbh->err()) {
830: &Apache::lonnet::logthis('unable to execute '.$store_command);
831: &Apache::lonnet::logthis($dbh->errstr());
832: }
833: next;
834: } elsif ($parameter eq 'version') {
835: next;
836: } elsif (&symb_is_for_task($symb)) {
837: next if ($parameter !~ /^resource\.(.*)\.(award|
838: awarded|
839: solved|
840: submission|
841: portfiles|
842: status|
843: version|
844: regrader)\s*$/x);
845: my ($version_and_part_id, $field) = ($1,$2);
846:
847: next if ($version_and_part_id !~ /\./
848: && $field ne 'regrader' && $field ne 'version');
849:
850: my ($version, $part, $instance) =
851: split(/\./,$version_and_part_id);
852:
853: #skip and instance dimension or criteria specific data
854: next if (defined($instance)
855: && $instance ne $field
856: && $instance ne 'bridgetask');
857:
858: if (!defined($part)) {
859: $part = $version;
860: }
861: my $resp_id = &get_part_id('0');
862: my $part_id = &get_part_id($part);
863:
864: if ($field eq 'version') {
865: # for tasks each version is an attempt at it thus
866: # version -> tries
867: $partdata->{$symb_id}{$part_id}{$transaction}{'tries'}=
868: $value;
869: # at new version time the record gets reset thus adding a
870: # virtual response awarddetail of 'new_version'
871: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific'}='status';
872: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific_value'}='new_version';
873:
874: } elsif ($field eq 'award' || $field eq 'awarded'
875: || $field eq 'solved') {
876: $partdata->{$symb_id}{$part_id}{$transaction}{$field}=
877: $value;
878: } elsif ($field eq 'portfiles') {
879: # tasks only accepts portfolio submissions
880: $value = $dbh->quote($value);
881: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'submission'}=$value;
882: } elsif ($field eq 'status') {
883: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific'}=$field;
884: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific_value'}=$value;
885: } elsif ($field eq 'regrader') {
886: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific_2'}=$field;
887: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific_value_2'}=$value;
888: }
889: } elsif ($parameter =~ /^resource\.(.*)\.(tries|
890: award|
891: awarded|
892: previous|
893: solved|
894: awarddetail|
895: submission|
896: submissiongrading|
897: molecule)\s*$/x){
898: # we do not have enough information to store an
899: # entire row, so we save it up until later.
900: my ($part_and_resp_id,$field) = ($1,$2);
901: my ($part,$part_id,$resp,$resp_id);
902: if ($part_and_resp_id =~ /\./) {
903: ($part,$resp) = split(/\./,$part_and_resp_id);
904: $part_id = &get_part_id($part);
905: $resp_id = &get_part_id($resp);
906: } else {
907: $part_id = &get_part_id($part_and_resp_id);
908: }
909: # Deal with part specific data
910: if ($field =~ /^(tries|award|awarded|previous)$/) {
911: $partdata->{$symb_id}->{$part_id}->{$transaction}->{$field}=$value;
912: }
913: # deal with response specific data
914: if (defined($resp_id) &&
915: $field =~ /^(awarddetail|
916: submission|
917: submissiongrading|
918: molecule)$/x) {
919: if ($field eq 'submission') {
920: # We have to be careful with user supplied input.
921: # most of the time we are okay because it is escaped.
922: # However, there is one wrinkle: submissions which end in
923: # and odd number of '\' cause insert errors to occur.
924: # Best trap this somehow...
925: $value = $dbh->quote($value);
926: }
927: if ($field eq 'submissiongrading' ||
928: $field eq 'molecule') {
929: $respdata->{$symb_id}->{$part_id}->{$resp_id}->{$transaction}->{'response_specific'}=$field;
930: $respdata->{$symb_id}->{$part_id}->{$resp_id}->{$transaction}->{'response_specific_value'}=$value;
931: } else {
932: $respdata->{$symb_id}->{$part_id}->{$resp_id}->{$transaction}->{$field}=$value;
933: }
934: }
935: }
936: }
937: ##
938: ## Store the part data
939: my $store_command = 'INSERT IGNORE INTO '.$fulldump_part_table.
940: ' VALUES '."\n";
941: my $store_rows = 0;
942: while (my ($symb_id,$hash1) = each (%$partdata)) {
943: while (my ($part_id,$hash2) = each (%$hash1)) {
944: while (my ($transaction,$data) = each (%$hash2)) {
945: $store_command .= "('".join("','",$symb_id,$part_id,
946: $student_id,
947: $transaction,
948: $data->{'tries'},
949: $data->{'award'},
950: $data->{'awarded'},
951: $data->{'previous'})."'),";
952: $store_rows++;
953: }
954: }
955: }
956: if ($store_rows) {
957: chop($store_command);
958: $dbh->do($store_command);
959: if ($dbh->err) {
960: $returnstatus = 'error saving part data';
961: &Apache::lonnet::logthis('insert error '.$dbh->errstr());
962: &Apache::lonnet::logthis("While attempting\n".$store_command);
963: }
964: }
965: ##
966: ## Store the response data
967: $store_command = 'INSERT IGNORE INTO '.$fulldump_response_table.
968: ' VALUES '."\n";
969: $store_rows = 0;
970: while (my ($symb_id,$hash1) = each (%$respdata)) {
971: while (my ($part_id,$hash2) = each (%$hash1)) {
972: while (my ($resp_id,$hash3) = each (%$hash2)) {
973: while (my ($transaction,$data) = each (%$hash3)) {
974: my $submission = $data->{'submission'};
975: # We have to be careful with user supplied input.
976: # most of the time we are okay because it is escaped.
977: # However, there is one wrinkle: submissions which end in
978: # and odd number of '\' cause insert errors to occur.
979: # Best trap this somehow...
980: $submission = $dbh->quote($submission);
981: $store_command .= "('".
982: join("','",$symb_id,$part_id,
983: $resp_id,$student_id,
984: $transaction,
985: $data->{'awarddetail'},
986: $data->{'response_specific'},
987: $data->{'response_specific_value'},
988: $data->{'response_specific_2'},
989: $data->{'response_specific_value_2'}).
990: "',".$submission."),";
991: $store_rows++;
992: }
993: }
994: }
995: }
996: if ($store_rows) {
997: chop($store_command);
998: $dbh->do($store_command);
999: if ($dbh->err) {
1000: $returnstatus = 'error saving response data';
1001: &Apache::lonnet::logthis('insert error '.$dbh->errstr());
1002: &Apache::lonnet::logthis("While attempting\n".$store_command);
1003: }
1004: }
1005: ##
1006: ## Update the students "current" data in the performance
1007: ## and parameters tables.
1008: my ($status,undef) = &store_student_data
1009: ($sname,$sdom,$courseid,
1010: &Apache::lonnet::convert_dump_to_currentdump(\%studentdata));
1011: if ($returnstatus eq 'okay' && $status ne 'okay') {
1012: $returnstatus = 'error saving current data:'.$status;
1013: } elsif ($status ne 'okay') {
1014: $returnstatus .= ' error saving current data:'.$status;
1015: }
1016: ##
1017: ## Update the students time......
1018: if ($returnstatus eq 'okay') {
1019: &store_updatetime($student_id,$time_of_retrieval,$time_of_retrieval);
1020: if ($dbh->err) {
1021: if ($returnstatus eq 'okay') {
1022: $returnstatus = 'error updating student time';
1023: } else {
1024: $returnstatus = 'error updating student time';
1025: }
1026: }
1027: }
1028: return $returnstatus;
1029: }
1030:
1031:
1032: sub update_student_data {
1033: my ($sname,$sdom,$courseid) = @_;
1034: #
1035: # Set up database names
1036: &setup_table_names($courseid);
1037: #
1038: my $student_id = &get_student_id($sname,$sdom);
1039: my $student = $sname.':'.$sdom;
1040: #
1041: my $returnstatus = 'okay';
1042: #
1043: # Download students data
1044: my $time_of_retrieval = time;
1045: my %student_data = &Apache::lonnet::currentdump($courseid,$sdom,$sname);
1046: if (&Apache::lonnet::error(%student_data)) {
1047: &Apache::lonnet::logthis('error getting data for '.
1048: $sname.':'.$sdom.' in course '.$courseid.
1049: ':'.(%student_data)[0]);
1050: $returnstatus =(%student_data)[0] ;
1051: return ($returnstatus,undef);
1052: }
1053: if (scalar(keys(%student_data)) < 1) {
1054: return ('no data',undef);
1055: }
1056: my @Results = &store_student_data($sname,$sdom,$courseid,\%student_data);
1057: #
1058: # Set the students update time
1059: if ($Results[0] eq 'okay') {
1060: &store_updatetime($student_id,$time_of_retrieval);
1061: }
1062: #
1063: return @Results;
1064: }
1065:
1066: sub store_updatetime {
1067: my ($student_id,$updatetime,$fullupdatetime)=@_;
1068: my $values = '';
1069: if (defined($updatetime)) {
1070: $values = 'updatetime='.$updatetime.' ';
1071: }
1072: if (defined($fullupdatetime)) {
1073: if ($values ne '') {
1074: $values .= ',';
1075: }
1076: $values .= 'fullupdatetime='.$fullupdatetime.' ';
1077: }
1078: return if ($values eq '');
1079: my $dbh = &Apache::lonmysql::get_dbh();
1080: my $request = 'UPDATE '.$student_table.' SET '.$values.
1081: ' WHERE student_id='.$student_id.' LIMIT 1';
1082: $dbh->do($request);
1083: }
1084:
1085: sub store_student_data {
1086: my ($sname,$sdom,$courseid,$student_data) = @_;
1087: #
1088: my $student_id = &get_student_id($sname,$sdom);
1089: my $student = $sname.':'.$sdom;
1090: #
1091: my $returnstatus = 'okay';
1092: #
1093: # Remove all of the students data from the table
1094: my $dbh = &Apache::lonmysql::get_dbh();
1095: $dbh->do('DELETE FROM '.$performance_table.' WHERE student_id='.
1096: $student_id);
1097: $dbh->do('DELETE FROM '.$parameters_table.' WHERE student_id='.
1098: $student_id);
1099: #
1100: # Store away the data
1101: #
1102: my $starttime = Time::HiRes::time;
1103: my $elapsed = 0;
1104: my $rows_stored;
1105: my $store_parameters_command = 'INSERT IGNORE INTO '.$parameters_table.
1106: ' VALUES '."\n";
1107: my $num_parameters = 0;
1108: my $store_performance_command = 'INSERT IGNORE INTO '.$performance_table.
1109: ' VALUES '."\n";
1110: return ('error',undef) if (! defined($dbh));
1111: while (my ($current_symb,$param_hash) = each(%{$student_data})) {
1112: #
1113: # make sure the symb is set up properly
1114: my $symb_id = &get_symb_id($current_symb);
1115: #
1116: # Parameters
1117: while (my ($parameter,$value) = each(%$param_hash)) {
1118: if ($parameter !~ /(timestamp|resource\.(.*)\.(solved|tries|awarded|award|awarddetail|previous))/) {
1119: my $sql_parameter = "('".join("','",
1120: $symb_id,$student_id,
1121: $parameter)."',".
1122: $dbh->quote($value)."),\n";
1123: $num_parameters ++;
1124: if ($sql_parameter !~ /''/) {
1125: $store_parameters_command .= $sql_parameter;
1126: #$rows_stored++;
1127: }
1128: }
1129: }
1130: # Performance
1131: my %stored;
1132: while (my ($parameter,$value) = each(%$param_hash)) {
1133: next if ($parameter !~ /^resource\.(.*)\.(solved|awarded)$/);
1134: my $part = $1;
1135: my $which = $2;
1136: next if ($part =~ /\./);
1137: next if (exists($stored{$part}));
1138: $stored{$part}++;
1139: #
1140: my $part_id = &get_part_id($part);
1141: next if (!defined($part_id));
1142:
1143: my ($solved,$awarded);
1144: if ($which eq 'solved') {
1145: $solved = $value;
1146: $awarded = $param_hash->{'resource.'.$part.'.awarded'};
1147: } else {
1148: $solved = $param_hash->{'resource.'.$part.'.solved'};
1149: $awarded = $value;
1150: }
1151: my $award = $param_hash->{'resource.'.$part.'.award'};
1152: my $awarddetail = $param_hash->{'resource.'.$part.'.awarddetail'};
1153: my $timestamp = $param_hash->{'timestamp'};
1154: my $tries = $param_hash->{'resource.'.$part.'.tries'};
1155: if (&symb_is_for_task($current_symb)) {
1156: $tries = $param_hash->{'resource.'.$part.'.version'};
1157: }
1158: #
1159: $solved = '' if (! defined($solved));
1160: $tries = '' if (! defined($tries));
1161: $awarded = '' if (! defined($awarded));
1162: $award = '' if (! defined($award));
1163: $awarddetail = '' if (! defined($awarddetail));
1164: my $sql_performance =
1165: "('".join("','",$symb_id,$student_id,$part_id,$part,
1166: $solved,$tries,$awarded,$award,
1167: $awarddetail,$timestamp)."'),\n";
1168: $store_performance_command .= $sql_performance;
1169: $rows_stored++;
1170: }
1171: }
1172: if (! $rows_stored) { return ($returnstatus, undef); }
1173: $store_parameters_command =~ s|,\n$||;
1174: $store_performance_command =~ s|,\n$||;
1175: my $start = Time::HiRes::time;
1176: $dbh->do($store_performance_command);
1177: if ($dbh->err()) {
1178: &Apache::lonnet::logthis('performance bigass insert error:'.
1179: $dbh->errstr());
1180: &Apache::lonnet::logthis('command = '.$/.$store_performance_command);
1181: $returnstatus = 'error: unable to insert performance into database';
1182: return ($returnstatus,$student_data);
1183: }
1184: $dbh->do($store_parameters_command) if ($num_parameters>0);
1185: if ($dbh->err()) {
1186: &Apache::lonnet::logthis('parameters bigass insert error:'.
1187: $dbh->errstr());
1188: &Apache::lonnet::logthis('command = '.$/.$store_parameters_command);
1189: &Apache::lonnet::logthis('rows_stored = '.$rows_stored);
1190: &Apache::lonnet::logthis('student_id = '.$student_id);
1191: $returnstatus = 'error: unable to insert parameters into database';
1192: return ($returnstatus,$student_data);
1193: }
1194: $elapsed += Time::HiRes::time - $start;
1195: return ($returnstatus,$student_data);
1196: }
1197:
1198:
1199: sub ensure_tables_are_set_up {
1200: my ($courseid) = @_;
1201: $courseid = $env{'request.course.id'} if (! defined($courseid));
1202: #
1203: # Clean out package variables
1204: &setup_table_names($courseid);
1205: #
1206: # if the tables do not exist, make them
1207: my @CurrentTable = &Apache::lonmysql::tables_in_db();
1208: my ($found_symb,$found_student,$found_groups,$found_groupnames,$found_part,
1209: $found_performance,$found_parameters,$found_fulldump_part,
1210: $found_fulldump_response,$found_fulldump_timestamp,
1211: $found_weight);
1212: foreach (@CurrentTable) {
1213: $found_symb = 1 if ($_ eq $symb_table);
1214: $found_student = 1 if ($_ eq $student_table);
1215: $found_groups = 1 if ($_ eq $students_groups_table);
1216: $found_groupnames = 1 if ($_ eq $groupnames_table);
1217: $found_part = 1 if ($_ eq $part_table);
1218: $found_performance = 1 if ($_ eq $performance_table);
1219: $found_parameters = 1 if ($_ eq $parameters_table);
1220: $found_fulldump_part = 1 if ($_ eq $fulldump_part_table);
1221: $found_fulldump_response = 1 if ($_ eq $fulldump_response_table);
1222: $found_fulldump_timestamp = 1 if ($_ eq $fulldump_timestamp_table);
1223: $found_weight = 1 if ($_ eq $weight_table);
1224: }
1225: if (!$found_symb ||
1226: !$found_student || !$found_part ||
1227: !$found_performance || !$found_parameters ||
1228: !$found_fulldump_part || !$found_fulldump_response ||
1229: !$found_fulldump_timestamp || !$found_weight ) {
1230: if (&init_dbs($courseid,1)) {
1231: return 'error';
1232: }
1233: }
1234: }
1235:
1236: sub ensure_current_data {
1237: my ($sname,$sdom,$courseid) = @_;
1238: my $status = 'okay'; # return value
1239: #
1240: $courseid = $env{'request.course.id'} if (! defined($courseid));
1241: &ensure_tables_are_set_up($courseid);
1242: #
1243: # Get the update time for the user
1244: my $updatetime = 0;
1245: my $getuserdir = 1;
1246: my $modifiedtime = &Apache::lonnet::GetFileTimestamp
1247: ($sdom,$sname,$courseid.'.db',$getuserdir);
1248: #
1249: if ($modifiedtime == -1) {
1250: return ('no data',undef);
1251: }
1252:
1253: my $student_id = &get_student_id($sname,$sdom);
1254: &get_students_groupids($student_id);
1255: my @Result = &Apache::lonmysql::get_rows($student_table,
1256: "student_id ='$student_id'");
1257: my $data = undef;
1258: if (@Result) {
1259: $updatetime = $Result[0]->[6]; # Ack! This is dumb!
1260: }
1261: if ($modifiedtime > $updatetime) {
1262: ($status,$data) = &update_student_data($sname,$sdom,$courseid);
1263: }
1264: return ($status,$data);
1265: }
1266:
1267:
1268: sub ensure_current_full_data {
1269: my ($sname,$sdom,$courseid) = @_;
1270: my $status = 'okay'; # return value
1271: #
1272: $courseid = $env{'request.course.id'} if (! defined($courseid));
1273: &ensure_tables_are_set_up($courseid);
1274: #
1275: # Get the update time for the user
1276: my $getuserdir = 1;
1277: my $modifiedtime = &Apache::lonnet::GetFileTimestamp
1278: ($sdom,$sname,$courseid.'.db',$getuserdir);
1279: #
1280: my $student_id = &get_student_id($sname,$sdom);
1281: &get_students_groupids($student_id);
1282: my @Result = &Apache::lonmysql::get_rows($student_table,
1283: "student_id ='$student_id'");
1284: my $updatetime;
1285: if (@Result && ref($Result[0]) eq 'ARRAY') {
1286: $updatetime = $Result[0]->[7];
1287: }
1288: if (! defined($updatetime) || $modifiedtime > $updatetime) {
1289: $status = &update_full_student_data($sname,$sdom,$courseid);
1290: }
1291: return $status;
1292: }
1293:
1294: sub ensure_current_groups {
1295: my ($courseid) = @_;
1296: my ($cdom,$cnum);
1297: if (defined($courseid)) {
1298: my %coursehash = &Apache::lonnet::coursedescription($courseid);
1299: $cdom = $coursehash{'domain'};
1300: $cnum = $coursehash{'num'};
1301: } elsif ($env{'request.course.id'}) {
1302: $courseid = $env{'request.course.id'};
1303: $cdom = $env{'course.'.$courseid.'.domain'};
1304: $cnum = $env{'course.'.$courseid.'.num'};
1305: }
1306: if ($cdom eq '' || $cnum eq '') {
1307: return 'error: invalid course';
1308: }
1309: &setup_table_names($courseid);
1310: my @CurrentTables = &Apache::lonmysql::tables_in_db();
1311: unless (grep(/^\Q$groupnames_table\E$/,@CurrentTables)) {
1312: return;
1313: }
1314: # Get the update time for the groupnames table
1315: my $getuserdir = 1;
1316: my $modifiedtime = &Apache::lonnet::GetFileTimestamp
1317: ($cdom,$cnum,'coursegroups.db',$getuserdir);
1318: my %tableinfo = &Apache::lonmysql::table_information($groupnames_table);
1319: my $updatetime;
1320: if ($tableinfo{'Update_time'}) {
1321: $updatetime = $tableinfo{'Update_time'};
1322: }
1323: if (! defined($updatetime) || $modifiedtime > $updatetime) {
1324: my (%groups_in_sql,%removegroups,$addgroup);
1325: my %curr_groups = &Apache::longroup::coursegroups($cdom,$cnum);
1326: my @Result = &Apache::lonmysql::get_rows($groupnames_table);
1327: foreach my $row (@Result) {
1328: my ($id,$name) = @{$row};
1329: unless (exists($curr_groups{$name})) {
1330: $groups_in_sql{$name}=$id;
1331: } elsif ($id) {
1332: $removegroups{$id} = $name;
1333: }
1334: }
1335: foreach my $group (keys(%curr_groups)) {
1336: unless (exists($groups_in_sql{$group})) {
1337: $addgroup = 1;
1338: last;
1339: }
1340: }
1341: if (keys(%removegroups)) {
1342: my $dbh = &Apache::lonmysql::get_dbh();
1343: foreach my $group_id (keys(%removegroups)) {
1344: my $command = 'DELETE FROM '.$groupnames_table.' WHERE group_id='.
1345: $group_id;
1346: $dbh->do($command);
1347: if ($dbh->err()) {
1348: &Apache::lonnet::logthis("error ".$dbh->errstr().
1349: " occurred executing \n".
1350: "SQL command: $command");
1351: }
1352: }
1353: }
1354: if ($addgroup) {
1355: &populate_groupnames_table($courseid);
1356: }
1357: }
1358: return;
1359: }
1360:
1361: sub ensure_current_students_groups {
1362: my ($courseid) = @_;
1363: my ($cdom,$cnum);
1364: if (defined($courseid)) {
1365: my %coursehash = &Apache::lonnet::coursedescription($courseid);
1366: $cdom = $coursehash{'domain'};
1367: $cnum = $coursehash{'num'};
1368: } elsif ($env{'request.course.id'}) {
1369: $courseid = $env{'request.course.id'};
1370: $cdom = $env{'course.'.$courseid.'.domain'};
1371: $cnum = $env{'course.'.$courseid.'.num'};
1372: }
1373: &setup_table_names($courseid);
1374: my @CurrentTables = &Apache::lonmysql::tables_in_db();
1375: unless (grep(/^\Q$students_groups_table\E$/,@CurrentTables)) {
1376: return;
1377: }
1378: # Get the update time for the groupnames table
1379: my $getuserdir = 1;
1380: my $modifiedtime = &Apache::lonnet::GetFileTimestamp
1381: ($cdom,$cnum,'groupmembership.db',$getuserdir);
1382: my %tableinfo = &Apache::lonmysql::table_information($students_groups_table);
1383: my $updatetime;
1384: if ($tableinfo{'Update_time'}) {
1385: $updatetime = $tableinfo{'Update_time'};
1386: }
1387: if ((!defined($updatetime)) || ($modifiedtime > $updatetime)) {
1388: if (&Apache::lonmysql::drop_table($students_groups_table)) {
1389: if (&init_dbs($courseid)) {
1390: return "error creating $students_groups_table\n";
1391: } else {
1392: &populate_students_groups_table($courseid);
1393: }
1394: }
1395: }
1396: return;
1397: }
1398:
1399: sub ensure_current_sections {
1400: my ($courseid) = @_;
1401: my ($cdom,$cnum);
1402: if (defined($courseid)) {
1403: my %coursehash = &Apache::lonnet::coursedescription($courseid);
1404: $cdom = $coursehash{'domain'};
1405: $cnum = $coursehash{'num'};
1406: } elsif ($env{'request.course.id'}) {
1407: $courseid = $env{'request.course.id'};
1408: $cdom = $env{'course.'.$courseid.'.domain'};
1409: $cnum = $env{'course.'.$courseid.'.num'};
1410: }
1411: &setup_table_names($courseid);
1412: my @CurrentTables = &Apache::lonmysql::tables_in_db();
1413: unless (grep(/^\Q$student_table\E$/,@CurrentTables)) {
1414: return;
1415: }
1416: # Get the update time for the student table
1417: my $getuserdir = 1;
1418: my $modifiedtime = &Apache::lonnet::GetFileTimestamp
1419: ($cdom,$cnum,'classlist.db',$getuserdir);
1420: my %tableinfo = &Apache::lonmysql::table_information($student_table);
1421: my $updatetime;
1422: if ($tableinfo{'Update_time'}) {
1423: $updatetime = $tableinfo{'Update_time'};
1424: }
1425: if ((!defined($updatetime)) || ($modifiedtime > $updatetime)) {
1426: &update_student_table($cdom,$cnum);
1427: }
1428: return;
1429: }
1430:
1431: sub update_student_table {
1432: my ($cdom,$cnum) = @_;
1433: return unless (($cdom ne '') && ($cnum ne ''));
1434: my (%roster,%sqldata);
1435: my $classlist = &get_classlist($cdom,$cnum);
1436: while (my ($student,$data) = each (%$classlist)) {
1437: my ($section,$start,$end) = ($data->[&CL_SECTION()],
1438: $data->[&CL_START()],
1439: $data->[&CL_END()]);
1440: if ($section eq '' || $section =~ /^\s*$/) {
1441: $section = 'none';
1442: }
1443: if ($start eq '') { $start = 0; }
1444: if ($end eq '') { $end = 0; }
1445: $roster{$student}{'section'} = $section;
1446: $roster{$student}{'start'} = $start;
1447: $roster{$student}{'end'} = $end;
1448: }
1449: my $dbh = &Apache::lonmysql::get_dbh();
1450: my $statement = "SELECT student_id,student,section,start,end FROM $student_table";
1451: my $sth = $dbh->prepare($statement);
1452: $sth->execute();
1453: if ($sth->err()) {
1454: &Apache::lonnet::logthis("Unable to execute MySQL request:");
1455: &Apache::lonnet::logthis("\n".$statement."\n");
1456: &Apache::lonnet::logthis("error is:".$sth->errstr());
1457: return undef;
1458: }
1459: foreach my $row (@{$sth->fetchall_arrayref}) {
1460: my ($id,$student,$section,$start,$end) = (@$row);
1461: if (ref($roster{$student}) eq 'HASH') {
1462: if (($roster{$student}{'section'} ne $section) ||
1463: ($roster{$student}{'start'} ne $start) ||
1464: ($roster{$student}{'end'} ne $end)) {
1465: $sqldata{$id} = {
1466: section => $roster{$student}{'section'},
1467: start => $roster{$student}{'start'},
1468: end => $roster{$student}{'end'},
1469: };
1470: }
1471: }
1472: }
1473: $sth->finish();
1474: if (keys(%sqldata)) {
1475: foreach my $id (sort { $a <=> $b } keys(%sqldata)) {
1476: my $request = "UPDATE $student_table SET section='$sqldata{$id}{section}'".
1477: ", start='$sqldata{$id}{start}'".
1478: ", end='$sqldata{$id}{end}' WHERE student_id='$id'";
1479: $dbh->do($request);
1480: }
1481: }
1482: return;
1483: }
1484:
1485: sub get_student_data_from_performance_cache {
1486: my ($sname,$sdom,$symb,$courseid)=@_;
1487: my $student = $sname.':'.$sdom if (defined($sname) && defined($sdom));
1488: &setup_table_names($courseid);
1489: #
1490: # Return hash
1491: my $studentdata;
1492: #
1493: my $dbh = &Apache::lonmysql::get_dbh();
1494: my $request = "SELECT ".
1495: "d.symb,a.part,a.solved,a.tries,a.awarded,a.award,a.awarddetail,".
1496: "a.timestamp ";
1497: if (defined($student)) {
1498: $request .= "FROM $student_table AS b ".
1499: "LEFT JOIN $performance_table AS a ON b.student_id=a.student_id ".
1500: # "LEFT JOIN $part_table AS c ON c.part_id = a.part_id ".
1501: "LEFT JOIN $symb_table AS d ON d.symb_id = a.symb_id ".
1502: "WHERE student='$student'";
1503: if (defined($symb) && $symb ne '') {
1504: $request .= " AND d.symb=".$dbh->quote($symb);
1505: }
1506: } elsif (defined($symb) && $symb ne '') {
1507: $request .= "FROM $symb_table as d ".
1508: "LEFT JOIN $performance_table AS a ON d.symb_id=a.symb_id ".
1509: # "LEFT JOIN $part_table AS c ON c.part_id = a.part_id ".
1510: "LEFT JOIN $student_table AS b ON b.student_id = a.student_id ".
1511: "WHERE symb='".$dbh->quote($symb)."'";
1512: }
1513: my $starttime = Time::HiRes::time;
1514: my $rows_retrieved = 0;
1515: my $sth = $dbh->prepare($request);
1516: $sth->execute();
1517: if ($sth->err()) {
1518: &Apache::lonnet::logthis("Unable to execute MySQL request:");
1519: &Apache::lonnet::logthis("\n".$request."\n");
1520: &Apache::lonnet::logthis("error is:".$sth->errstr());
1521: return undef;
1522: }
1523: foreach my $row (@{$sth->fetchall_arrayref}) {
1524: $rows_retrieved++;
1525: my ($symb,$part,$solved,$tries,$awarded,$award,$awarddetail,$time) =
1526: (@$row);
1527: my $base = 'resource.'.$part;
1528: $studentdata->{$symb}->{$base.'.solved'} = $solved;
1529: $studentdata->{$symb}->{$base.'.tries'} = $tries;
1530: $studentdata->{$symb}->{$base.'.awarded'} = $awarded;
1531: $studentdata->{$symb}->{$base.'.award'} = $award;
1532: $studentdata->{$symb}->{$base.'.awarddetail'} = $awarddetail;
1533: $studentdata->{$symb}->{'timestamp'} = $time if (defined($time) && $time ne '');
1534: }
1535: ## Get misc parameters
1536: $request = 'SELECT c.symb,a.parameter,a.value '.
1537: "FROM $student_table AS b ".
1538: "LEFT JOIN $parameters_table AS a ON b.student_id=a.student_id ".
1539: "LEFT JOIN $symb_table AS c ON c.symb_id = a.symb_id ".
1540: "WHERE student='$student'";
1541: if (defined($symb) && $symb ne '') {
1542: $request .= " AND c.symb=".$dbh->quote($symb);
1543: }
1544: $sth = $dbh->prepare($request);
1545: $sth->execute();
1546: if ($sth->err()) {
1547: &Apache::lonnet::logthis("Unable to execute MySQL request:");
1548: &Apache::lonnet::logthis("\n".$request."\n");
1549: &Apache::lonnet::logthis("error is:".$sth->errstr());
1550: if (defined($symb) && $symb ne '') {
1551: $studentdata = $studentdata->{$symb};
1552: }
1553: return $studentdata;
1554: }
1555: #
1556: foreach my $row (@{$sth->fetchall_arrayref}) {
1557: $rows_retrieved++;
1558: my ($symb,$parameter,$value) = (@$row);
1559: $studentdata->{$symb}->{$parameter} = $value;
1560: }
1561: #
1562: if (defined($symb) && $symb ne '') {
1563: $studentdata = $studentdata->{$symb};
1564: }
1565: return $studentdata;
1566: }
1567:
1568:
1569: sub get_current_state {
1570: my ($sname,$sdom,$symb,$courseid,$forcedownload)=@_;
1571: #
1572: $courseid = $env{'request.course.id'} if (! defined($courseid));
1573: #
1574: return () if (! defined($sname) || ! defined($sdom));
1575: #
1576: my ($status,$data) = &ensure_current_data($sname,$sdom,$courseid);
1577: # &Apache::lonnet::logthis
1578: # ('sname = '.$sname.
1579: # ' domain = '.$sdom.
1580: # ' status = '.$status.
1581: # ' data is '.(defined($data)?'defined':'undefined'));
1582: # while (my ($symb,$hash) = each(%$data)) {
1583: # &Apache::lonnet::logthis($symb."\n----------------------------------");
1584: # while (my ($key,$value) = each (%$hash)) {
1585: # &Apache::lonnet::logthis(" ".$key." = ".$value);
1586: # }
1587: # }
1588: #
1589: if (defined($data) && defined($symb) && ref($data->{$symb})) {
1590: return %{$data->{$symb}};
1591: } elsif (defined($data) && ! defined($symb) && ref($data)) {
1592: return %$data;
1593: }
1594: if ($status eq 'no data') {
1595: return ();
1596: } else {
1597: if ($status ne 'okay' && $status ne '') {
1598: &Apache::lonnet::logthis('status = '.$status);
1599: return ('error: '.$status,undef);
1600: }
1601: my $returnhash = &get_student_data_from_performance_cache($sname,$sdom,
1602: $symb,$courseid);
1603: return %$returnhash if (defined($returnhash));
1604: }
1605: return ();
1606: }
1607:
1608:
1609: sub get_problem_statistics {
1610: my ($Sections,$Groups,$status,$symb,$part,$courseid,$starttime,$endtime) = @_;
1611: return if (! defined($symb) || ! defined($part));
1612: $courseid = $env{'request.course.id'} if (! defined($courseid));
1613: #
1614: &setup_table_names($courseid);
1615: my $symb_id = &get_symb_id($symb);
1616: my $part_id = &get_part_id($part);
1617: my $stats_table = &temp_table_name($courseid,'problem_stats');
1618: #
1619: my $dbh = &Apache::lonmysql::get_dbh();
1620: return undef if (! defined($dbh));
1621: #
1622: # Clean out the table
1623: $dbh->do('DROP TABLE '.$stats_table); # May return an error
1624: my $request =
1625: 'CREATE TEMPORARY TABLE '.$stats_table.' '.
1626: 'SELECT a.student_id,a.solved,a.award,a.awarded,a.tries '.
1627: 'FROM '.$performance_table.' AS a ';
1628: #
1629: # See if we need to include some requirements on the students
1630: if ((defined($Sections) && lc($Sections->[0]) ne 'all') ||
1631: (defined($status) && lc($status) ne 'any')) {
1632: $request .= 'NATURAL LEFT JOIN '.$student_table.' AS b ';
1633: }
1634: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
1635: if (defined($groups_join)) {
1636: $request .= $groups_join;
1637: }
1638: $request .= ' WHERE a.symb_id='.$symb_id.' AND a.part_id='.$part_id;
1639: #
1640: # Limit the students included to those specified
1641: my ($section_limits,$enrollment_limits)=
1642: &limit_by_section_and_status($Sections,$status,'b');
1643: #
1644: # Limit by starttime and endtime
1645: my $time_requirements = undef;
1646: if (defined($starttime)) {
1647: $time_requirements .= 'a.timestamp>='.$starttime;
1648: if (defined($endtime)) {
1649: $time_requirements .= ' AND a.timestamp<='.$endtime;
1650: }
1651: } elsif (defined($endtime)) {
1652: $time_requirements .= 'a.timestamp<='.$endtime;
1653: }
1654: if (defined($time_requirements)) {
1655: $request .= ' AND '.$time_requirements;
1656: }
1657: if (defined($section_limits)) {
1658: $request .= ' AND '.$section_limits;
1659: }
1660: if (defined($enrollment_limits)) {
1661: $request .= ' AND '.$enrollment_limits;
1662: }
1663: # Limit by group, as required
1664: if (defined($group_limits)) {
1665: $request .= ' AND '.$group_limits;
1666: }
1667: #
1668: # Finally, execute the request to create the temporary table
1669: $dbh->do($request);
1670: #
1671: # Collect the first suite of statistics
1672: $request = 'SELECT COUNT(*),SUM(tries),'.
1673: 'AVG(tries),STD(tries) '.
1674: 'FROM '.$stats_table;
1675: my ($num,$tries,$mean,$STD) = &execute_SQL_request
1676: ($dbh,$request);
1677: #
1678: $request = 'SELECT MAX(tries),MIN(tries) FROM '.$stats_table.
1679: ' WHERE awarded>0';
1680: if (defined($time_requirements)) {
1681: $request .= ' AND '.$time_requirements;
1682: }
1683: my ($max,$min) = &execute_SQL_request($dbh,$request);
1684: #
1685: $request = 'SELECT SUM(awarded) FROM '.$stats_table;
1686: if (defined($time_requirements)) {
1687: $request .= ' AND '.$time_requirements;
1688: }
1689: my ($Solved) = &execute_SQL_request($dbh,$request);
1690: #
1691: $request = 'SELECT SUM(awarded) FROM '.$stats_table.
1692: " WHERE solved='correct_by_override'";
1693: if (defined($time_requirements)) {
1694: $request .= ' AND '.$time_requirements;
1695: }
1696: my ($solved) = &execute_SQL_request($dbh,$request);
1697: #
1698: $Solved -= $solved;
1699: #
1700: $num = 0 if (! defined($num));
1701: $tries = 0 if (! defined($tries));
1702: $max = 0 if (! defined($max));
1703: $min = 0 if (! defined($min));
1704: $STD = 0 if (! defined($STD));
1705: $Solved = 0 if (! defined($Solved) || $Solved < 0);
1706: $solved = 0 if (! defined($solved));
1707: #
1708: # Compute the more complicated statistics
1709: my $DegOfDiff = 'nan';
1710: $DegOfDiff = 1-($Solved)/$tries if ($tries>0);
1711: #
1712: my $SKEW = 'nan';
1713: my $wrongpercent = 0;
1714: my $numwrong = 'nan';
1715: if ($num > 0) {
1716: ($SKEW) = &execute_SQL_request($dbh,'SELECT SQRT(SUM('.
1717: 'POWER(tries - '.$STD.',3)'.
1718: '))/'.$num.' FROM '.$stats_table);
1719: $numwrong = $num-$Solved;
1720: $wrongpercent=int(10*100*$numwrong/$num)/10;
1721: }
1722: #
1723: # Drop the temporary table
1724: $dbh->do('DROP TABLE '.$stats_table); # May return an error
1725: #
1726: # Return result
1727: return { num_students => $num,
1728: tries => $tries,
1729: max_tries => $max,
1730: min_tries => $min,
1731: mean_tries => $mean,
1732: std_tries => $STD,
1733: skew_tries => $SKEW,
1734: num_solved => $Solved,
1735: num_override => $solved,
1736: num_wrong => $numwrong,
1737: per_wrong => $wrongpercent,
1738: deg_of_diff => $DegOfDiff };
1739: }
1740:
1741: ##
1742: ## This is a helper for get_statistics
1743: sub execute_SQL_request {
1744: my ($dbh,$request)=@_;
1745: # &Apache::lonnet::logthis($request);
1746: my $sth = $dbh->prepare($request);
1747: if (!$sth) {
1748: die($dbh->errstr . " SQL: $request");
1749: }
1750: $sth->execute();
1751: my $row = $sth->fetchrow_arrayref();
1752: if (ref($row) eq 'ARRAY' && scalar(@$row)>0) {
1753: return @$row;
1754: }
1755: return ();
1756: }
1757:
1758:
1759: sub populate_weight_table {
1760: my ($courseid) = @_;
1761: if (! defined($courseid)) {
1762: $courseid = $env{'request.course.id'};
1763: }
1764: #
1765: &setup_table_names($courseid);
1766: my $navmap = Apache::lonnavmaps::navmap->new();
1767: if (!defined($navmap)) {
1768: &Apache::lonnet::logthis('loncoursedata::populate_weight_table:'.$/.
1769: ' unable to get navmaps resource'.$/.
1770: ' '.join(' ',(caller)));
1771: return;
1772: }
1773: my @sequences = $navmap->retrieveResources(undef,
1774: sub { shift->is_map(); },1,0,1);
1775: my @resources;
1776: foreach my $seq (@sequences) {
1777: push(@resources,$navmap->retrieveResources($seq,
1778: sub {shift->is_problem();},
1779: 0,0,0));
1780: }
1781: if (! scalar(@resources)) {
1782: &Apache::lonnet::logthis('loncoursedata::populate_weight_table:'.$/.
1783: ' no resources returned for '.$courseid);
1784: return;
1785: }
1786: # Since we use lonnet::EXT to retrieve problem weights,
1787: # to ensure current data we must clear the caches out.
1788: &Apache::lonnet::clear_EXT_cache_status();
1789: my $dbh = &Apache::lonmysql::get_dbh();
1790: my $request = 'INSERT IGNORE INTO '.$weight_table.
1791: "(symb_id,part_id,weight) VALUES ";
1792: my $weight;
1793: foreach my $res (@resources) {
1794: my $symb_id = &get_symb_id($res->symb);
1795: foreach my $part (@{$res->parts}) {
1796: my $part_id = &get_part_id($part);
1797: $weight = &Apache::lonnet::EXT('resource.'.$part.'.weight',
1798: $res->symb,
1799: undef,undef,undef);
1800: if (!defined($weight) || ($weight eq '')) {
1801: $weight=1;
1802: }
1803: $request .= "('".$symb_id."','".$part_id."','".$weight."'),";
1804: }
1805: }
1806: $request =~ s/(,)$//;
1807: # &Apache::lonnet::logthis('request = '.$/.$request);
1808: $dbh->do($request);
1809: if ($dbh->err()) {
1810: &Apache::lonnet::logthis("error ".$dbh->errstr().
1811: " occurred executing \n".
1812: $request);
1813: }
1814: return;
1815: }
1816:
1817: sub limit_by_start_end_time {
1818: my ($starttime,$endtime,$table) = @_;
1819: my $time_requirements = undef;
1820: if (defined($starttime)) {
1821: $time_requirements .= $table.".timestamp>='".$starttime."'";
1822: if (defined($endtime)) {
1823: $time_requirements .= " AND ".$table.".timestamp<='".$endtime."'";
1824: }
1825: } elsif (defined($endtime)) {
1826: $time_requirements .= $table.".timestamp<='".$endtime."'";
1827: }
1828: return $time_requirements;
1829: }
1830:
1831:
1832: sub limit_by_section_and_status {
1833: my ($Sections,$enrollment,$tablename) = @_;
1834: my $student_requirements = undef;
1835: if ( (defined($Sections) && $Sections->[0] ne 'all')) {
1836: $student_requirements = '('.
1837: join(' OR ', map { $tablename.".section='".$_."'" } @$Sections
1838: ).')';
1839: }
1840: my $enrollment_requirements=undef;
1841: if (defined($enrollment) && $enrollment ne 'Any') {
1842: my $now = time();
1843: if ( $enrollment eq 'Future' ) {
1844: $enrollment_requirements =
1845: "( $tablename.start > $now AND ".
1846: "( $tablename.end = 0 OR $tablename.end > $now))";
1847: } elsif ( $enrollment eq 'Active' ) {
1848: $enrollment_requirements =
1849: "(( $tablename.start = 0 OR $tablename.start < $now ) AND ".
1850: " ( $tablename.end = 0 OR $tablename.end > $now ))";
1851: } elsif ( $enrollment eq 'Expired' ) {
1852: $enrollment_requirements =
1853: "(( $tablename.start < $now ) AND ".
1854: " ( $tablename.end < $now ))";
1855: }
1856: }
1857: return ($student_requirements,$enrollment_requirements);
1858: }
1859:
1860:
1861:
1862: sub limit_by_group {
1863: my ($Groups,$stutable,$grptable,$stugrptab) = @_;
1864: my $groups_join = undef;
1865: my $group_limits = undef;
1866: if ( (defined($Groups) && $Groups->[0] ne 'all')) {
1867: $groups_join =
1868: ' LEFT JOIN '.$students_groups_table.
1869: ' AS '.$stugrptab.' ON '.
1870: $stugrptab.'.student_id = '.$stutable.'.student_id'.
1871: ' LEFT JOIN '.$groupnames_table.
1872: ' AS '.$grptable.' ON '.
1873: $stugrptab.'.group_id = '.$grptable.'.group_id ';
1874: $group_limits =
1875: ' ('.
1876: join(' OR ', map { "$grptable.groupname='".$_."'" } @$Groups
1877: ).')';
1878: }
1879: return ($groups_join,$group_limits);
1880: }
1881:
1882:
1883: sub RNK_student { return 0; };
1884: sub RNK_score { return 1; };
1885:
1886: sub rank_students_by_scores_on_resources {
1887: my ($resources,$Sections,$Groups,$enrollment,$courseid,$starttime,$endtime,
1888: $has_award_for) = @_;
1889: return if (! defined($resources) || ! ref($resources) eq 'ARRAY');
1890: if (! defined($courseid)) {
1891: $courseid = $env{'request.course.id'};
1892: }
1893: #
1894: &setup_table_names($courseid);
1895: my $dbh = &Apache::lonmysql::get_dbh();
1896: my ($section_limits,$enrollment_limits)=
1897: &limit_by_section_and_status($Sections,$enrollment,'b');
1898: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
1899: my $symb_limits = '('.join(' OR ',map {'a.symb_id='.&get_symb_id($_);
1900: } @$resources
1901: ).')';
1902: my ($award_col, $award_join, $award_clause) = ('', '', '');
1903: if ($has_award_for) {
1904: my $resource_id = &get_symb_id($has_award_for);
1905: $award_col = ", perf.awarded";
1906: $award_join = "LEFT JOIN $performance_table AS perf ON perf.symb_id"
1907: ." = $resource_id AND perf.student_id = b.student_id ";
1908: $award_clause = "AND perf.awarded IS NOT NULL";
1909: }
1910: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
1911: my $request = "SELECT b.student,SUM(a.awarded*w.weight) AS score "
1912: ."$award_col FROM $performance_table AS a ".
1913: "NATURAL LEFT JOIN $weight_table AS w ".
1914: "LEFT JOIN $student_table AS b ON a.student_id=b.student_id ".
1915: "$award_join $groups_join ";
1916: my $limits;
1917: if (defined($section_limits)) {
1918: $limits .= $section_limits.' AND ';
1919: }
1920: if (defined($enrollment_limits)) {
1921: $limits .= $enrollment_limits.' AND ';
1922: }
1923: if (defined($time_limits)) {
1924: $limits .= $time_limits.' AND ';
1925: }
1926: if ($symb_limits ne '()') {
1927: $limits .= $symb_limits.' AND ';
1928: }
1929: if (defined($group_limits)) {
1930: $limits .= $group_limits.' AND ';
1931: }
1932: if ($limits) {
1933: $limits =~ s/( AND )$//; # Remove extra conjunction
1934: $request .= "WHERE $limits";
1935: }
1936: $request .= " $award_clause GROUP BY a.student_id ORDER BY score";
1937: #&Apache::lonnet::logthis('request = '.$/.$request);
1938: my $sth = $dbh->prepare($request) or die "Can't prepare $request";
1939: $sth->execute();
1940: my $rows = $sth->fetchall_arrayref();
1941: return ($rows);
1942: }
1943:
1944: sub get_sum_of_scores {
1945: my ($symb,$part,$students,$courseid,$starttime,$endtime) = @_;
1946: if (! defined($courseid)) {
1947: $courseid = $env{'request.course.id'};
1948: }
1949: if (defined($students) &&
1950: ((@$students == 0) ||
1951: (@$students == 1 && (! defined($students->[0]) ||
1952: $students->[0] eq ''))
1953: )
1954: ){
1955: undef($students);
1956: }
1957: #
1958: &setup_table_names($courseid);
1959: my $dbh = &Apache::lonmysql::get_dbh();
1960: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
1961: my $request = 'SELECT SUM(a.awarded*w.weight),SUM(w.weight) FROM '.
1962: $performance_table.' AS a '.
1963: 'NATURAL LEFT JOIN '.$weight_table.' AS w ';
1964: $request .= 'WHERE a.symb_id='.&get_symb_id($symb).
1965: ' AND a.part_id='.&get_part_id($part);
1966: if (defined($time_limits)) {
1967: $request .= ' AND '.$time_limits;
1968: }
1969: if (defined($students)) {
1970: $request .= ' AND ('.
1971: join(' OR ',map {'a.student_id='.&get_student_id(split(':',$_));
1972: } @$students).
1973: ')';
1974: }
1975: my $sth = $dbh->prepare($request);
1976: $sth->execute();
1977: my $rows = $sth->fetchrow_arrayref();
1978: if ($dbh->err) {
1979: &Apache::lonnet::logthis('error 1 = '.$dbh->errstr());
1980: &Apache::lonnet::logthis('prepared then executed, fetchrow_arrayrefed'.
1981: $/.$request);
1982: return (undef,undef);
1983: }
1984: return ($rows->[0],$rows->[1]);
1985: }
1986:
1987:
1988: sub score_stats {
1989: my ($Sections,$Groups,$enrollment,$symbs,$starttime,$endtime,$courseid)=@_;
1990: if (! defined($courseid)) {
1991: $courseid = $env{'request.course.id'};
1992: }
1993: #
1994: &setup_table_names($courseid);
1995: my $dbh = &Apache::lonmysql::get_dbh();
1996: #
1997: my ($section_limits,$enrollment_limits)=
1998: &limit_by_section_and_status($Sections,$enrollment,'b');
1999: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
2000: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
2001: my @Symbids = map { &get_symb_id($_); } @{$symbs};
2002: #
2003: my $stats_table = &temp_table_name($courseid,'problem_stats');
2004: my $symb_restriction = join(' OR ',map {'a.symb_id='.$_;} @Symbids);
2005: my $request = 'DROP TABLE '.$stats_table;
2006: $dbh->do($request);
2007: $request =
2008: 'CREATE TEMPORARY TABLE '.$stats_table.' '.
2009: 'SELECT a.student_id,'.
2010: 'SUM(a.awarded*w.weight) AS score FROM '.
2011: $performance_table.' AS a '.
2012: 'NATURAL LEFT JOIN '.$weight_table.' AS w '.
2013: 'LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id '.
2014: $groups_join;
2015: my $limit = ' WHERE ('.$symb_restriction.')';
2016: if ($time_limits) {
2017: $limit .= ' AND '.$time_limits;
2018: }
2019: if ($section_limits) {
2020: $limit .= ' AND '.$section_limits;
2021: }
2022: if ($enrollment_limits) {
2023: $limit .= ' AND '.$enrollment_limits;
2024: }
2025: if ($group_limits) {
2026: $limit .= ' AND '.$group_limits;
2027: }
2028: $request .= $limit.' GROUP BY a.student_id';
2029: # &Apache::lonnet::logthis('request = '.$/.$request);
2030: my $sth = $dbh->prepare($request);
2031: $sth->execute();
2032: $request =
2033: 'SELECT AVG(score),STD(score),MAX(score),MIN(score),COUNT(score) '.
2034: 'FROM '.$stats_table;
2035: my ($ave,$std,$max,$min,$count) = &execute_SQL_request($dbh,$request);
2036: # &Apache::lonnet::logthis('request = '.$/.$request);
2037:
2038: $request = 'SELECT SUM(weight) FROM '.$weight_table.
2039: ' AS a WHERE ('.$symb_restriction.')';
2040: my ($max_possible) = &execute_SQL_request($dbh,$request);
2041: # &Apache::lonnet::logthis('request = '.$/.$request);
2042: return($min,$max,$ave,$std,$count,$max_possible);
2043: }
2044:
2045:
2046:
2047: sub count_stats {
2048: my ($Sections,$Groups,$enrollment,$symbs,$starttime,$endtime,$courseid)=@_;
2049: if (! defined($courseid)) {
2050: $courseid = $env{'request.course.id'};
2051: }
2052: #
2053: &setup_table_names($courseid);
2054: my $dbh = &Apache::lonmysql::get_dbh();
2055: #
2056: my ($section_limits,$enrollment_limits)=
2057: &limit_by_section_and_status($Sections,$enrollment,'b');
2058: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
2059: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
2060: my @Symbids = map { &get_symb_id($_); } @{$symbs};
2061: #
2062: my $stats_table = &temp_table_name($courseid,'problem_stats');
2063: my $symb_restriction = join(' OR ',map {'a.symb_id='.$_;} @Symbids);
2064: my $request = 'DROP TABLE '.$stats_table;
2065: $dbh->do($request);
2066: $request =
2067: 'CREATE TEMPORARY TABLE '.$stats_table.' '.
2068: 'SELECT a.student_id,'.
2069: 'SUM(a.awarded) AS count FROM '.
2070: $performance_table.' AS a '.
2071: 'LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id '.
2072: $groups_join;
2073: my $limit = ' WHERE ('.$symb_restriction.')';
2074: if ($time_limits) {
2075: $limit .= ' AND '.$time_limits;
2076: }
2077: if ($section_limits) {
2078: $limit .= ' AND '.$section_limits;
2079: }
2080: if ($enrollment_limits) {
2081: $limit .= ' AND '.$enrollment_limits;
2082: }
2083: if ($group_limits) {
2084: $limit .= ' AND '.$group_limits;
2085: }
2086: $request .= $limit.' GROUP BY a.student_id';
2087: # &Apache::lonnet::logthis('request = '.$/.$request);
2088: my $sth = $dbh->prepare($request);
2089: $sth->execute();
2090: $request =
2091: 'SELECT AVG(count),STD(count),MAX(count),MIN(count),COUNT(count) '.
2092: 'FROM '.$stats_table;
2093: my ($ave,$std,$max,$min,$count) = &execute_SQL_request($dbh,$request);
2094: # &Apache::lonnet::logthis('request = '.$/.$request);
2095: return($min,$max,$ave,$std,$count);
2096: }
2097:
2098:
2099: sub get_student_data {
2100: my ($students,$courseid) = @_;
2101: $courseid = $env{'request.course.id'} if (! defined($courseid));
2102: &setup_table_names($courseid);
2103: my $dbh = &Apache::lonmysql::get_dbh();
2104: return undef if (! defined($dbh));
2105: my $request = 'SELECT '.
2106: 'student_id, student '.
2107: 'FROM '.$student_table;
2108: if (defined($students)) {
2109: $request .= ' WHERE ('.
2110: join(' OR ', map {'student_id='.
2111: &get_student_id($_->{'username'},
2112: $_->{'domain'})
2113: } @$students
2114: ).')';
2115: }
2116: $request.= ' ORDER BY student_id';
2117: my $sth = $dbh->prepare($request);
2118: $sth->execute();
2119: if ($dbh->err) {
2120: &Apache::lonnet::logthis('error 2 = '.$dbh->errstr());
2121: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2122: return undef;
2123: }
2124: my $dataset = $sth->fetchall_arrayref();
2125: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2126: return $dataset;
2127: }
2128: }
2129:
2130: sub RD_student_id { return 0; }
2131: sub RD_awarddetail { return 1; }
2132: sub RD_response_eval { return 2; }
2133: sub RD_response_eval_2 { return 3; }
2134: sub RD_submission { return 4; }
2135: sub RD_timestamp { return 5; }
2136: sub RD_tries { return 6; }
2137: sub RD_sname { return 7; }
2138:
2139: sub get_response_data {
2140: my ($Sections,$Groups,$enrollment,$symb,$response,$courseid) = @_;
2141: return undef if (! defined($symb) ||
2142: ! defined($response));
2143: $courseid = $env{'request.course.id'} if (! defined($courseid));
2144: #
2145: &setup_table_names($courseid);
2146: my $symb_id = &get_symb_id($symb);
2147: if (! defined($symb_id)) {
2148: &Apache::lonnet::logthis('Unable to find symb for '.$symb.' in '.$courseid);
2149: return undef;
2150: }
2151: my $response_id = &get_part_id($response);
2152: if (! defined($response_id)) {
2153: &Apache::lonnet::logthis('Unable to find id for '.$response.' in '.$courseid);
2154: return undef;
2155: }
2156: #
2157: my $dbh = &Apache::lonmysql::get_dbh();
2158: return undef if (! defined($dbh));
2159: #
2160: my ($student_requirements,$enrollment_requirements) =
2161: &limit_by_section_and_status($Sections,$enrollment,'d');
2162: my ($groups_join,$group_limits) = &limit_by_group($Groups,'d','e','f');
2163: my $request = 'SELECT '.
2164: 'a.student_id, a.awarddetail, a.response_specific_value, '.
2165: 'a.response_specific_value_2, a.submission, b.timestamp, '.
2166: 'c.tries, d.student '.
2167: 'FROM '.$fulldump_response_table.' AS a '.
2168: 'LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
2169: 'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
2170: 'a.transaction = b.transaction '.
2171: 'LEFT JOIN '.$fulldump_part_table.' AS c '.
2172: 'ON a.symb_id=c.symb_id AND a.student_id=c.student_id AND '.
2173: 'a.part_id=c.part_id AND a.transaction = c.transaction '.
2174: 'LEFT JOIN '.$student_table.' AS d '.
2175: 'ON a.student_id=d.student_id '.
2176: $groups_join;
2177: my $limit = ' WHERE '.
2178: 'a.symb_id='.$symb_id.' AND a.response_id='.$response_id;
2179: if (defined($student_requirements)) {
2180: $limit .= ' AND '.$student_requirements;
2181: }
2182: if (defined($enrollment_requirements)) {
2183: $limit .= ' AND '.$enrollment_requirements;
2184: }
2185: if (defined($group_limits)) {
2186: $limit .= ' AND '.$group_limits;
2187: }
2188: $request .= $limit.' ORDER BY b.timestamp';
2189: # &Apache::lonnet::logthis("request =\n".$request);
2190: my $sth = $dbh->prepare($request);
2191: $sth->execute();
2192: if ($dbh->err) {
2193: &Apache::lonnet::logthis('error 3 = '.$dbh->errstr());
2194: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2195: return undef;
2196: }
2197: my $dataset = $sth->fetchall_arrayref();
2198: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2199: # Clear the \'s from around the submission
2200: for (my $i =0;$i<scalar(@$dataset);$i++) {
2201: $dataset->[$i]->[&RD_submission()] =~ s/(\'$|^\')//g;
2202: }
2203: return $dataset;
2204: }
2205: }
2206:
2207:
2208: sub RDs_awarddetail { return 3; }
2209: sub RDs_submission { return 2; }
2210: sub RDs_timestamp { return 1; }
2211: sub RDs_tries { return 0; }
2212: sub RDs_awarded { return 4; }
2213: sub RDs_response_eval { return 5; }
2214: sub RDs_response_eval_2 { return 6; }
2215: sub RDs_part_award { return 7; }
2216:
2217: sub get_response_data_by_student {
2218: my ($student,$symb,$response,$courseid) = @_;
2219: return undef if (! defined($symb) ||
2220: ! defined($response));
2221: $courseid = $env{'request.course.id'} if (! defined($courseid));
2222: #
2223: &setup_table_names($courseid);
2224: my $symb_id = &get_symb_id($symb);
2225: my $response_id = &get_part_id($response);
2226: #
2227: my $student_id = &get_student_id($student->{'username'},
2228: $student->{'domain'});
2229: #
2230: my $dbh = &Apache::lonmysql::get_dbh();
2231: return undef if (! defined($dbh));
2232: my $request = 'SELECT '.
2233: 'c.tries, b.timestamp, a.submission, a.awarddetail, c.awarded, '.
2234: 'a.response_specific_value, a.response_specific_value_2, c.award '.
2235: 'FROM '.$fulldump_response_table.' AS a '.
2236: 'LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
2237: 'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
2238: 'a.transaction = b.transaction '.
2239: 'LEFT JOIN '.$fulldump_part_table.' AS c '.
2240: 'ON a.symb_id=c.symb_id AND a.student_id=c.student_id AND '.
2241: 'a.part_id=c.part_id AND a.transaction = c.transaction '.
2242: 'LEFT JOIN '.$student_table.' AS d '.
2243: 'ON a.student_id=d.student_id '.
2244: 'LEFT JOIN '.$performance_table.' AS e '.
2245: 'ON a.symb_id=e.symb_id AND a.part_id=e.part_id AND '.
2246: 'a.student_id=e.student_id AND c.tries=e.tries '.
2247: 'WHERE '.
2248: 'a.symb_id='.$symb_id.' AND a.response_id='.$response_id.
2249: ' AND a.student_id='.$student_id.' ORDER BY b.timestamp';
2250: # &Apache::lonnet::logthis("request =\n".$request);
2251: my $sth = $dbh->prepare($request);
2252: $sth->execute();
2253: if ($dbh->err) {
2254: &Apache::lonnet::logthis('error 4 = '.$dbh->errstr());
2255: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2256: return undef;
2257: }
2258: my $dataset = $sth->fetchall_arrayref();
2259: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2260: # Clear the \'s from around the submission
2261: for (my $i =0;$i<scalar(@$dataset);$i++) {
2262: $dataset->[$i]->[&RDs_submission] =~ s/(\'$|^\')//g;
2263: }
2264: return $dataset;
2265: }
2266: return undef; # error occurred
2267: }
2268:
2269: sub RT_student_id { return 0; }
2270: sub RT_awarded { return 1; }
2271: sub RT_tries { return 2; }
2272: sub RT_timestamp { return 3; }
2273:
2274: sub get_response_time_data {
2275: my ($sections,$groups,$enrollment,$symb,$part,$courseid) = @_;
2276: return undef if (! defined($symb) ||
2277: ! defined($part));
2278: $courseid = $env{'request.course.id'} if (! defined($courseid));
2279: #
2280: &setup_table_names($courseid);
2281: my $symb_id = &get_symb_id($symb);
2282: if (! defined($symb_id)) {
2283: &Apache::lonnet::logthis('Unable to find symb for '.$symb.' in '.$courseid);
2284: return undef;
2285: }
2286: my $part_id = &get_part_id($part);
2287: if (! defined($part_id)) {
2288: &Apache::lonnet::logthis('Unable to find id for '.$part.' in '.$courseid);
2289: return undef;
2290: }
2291: #
2292: my $dbh = &Apache::lonmysql::get_dbh();
2293: return undef if (! defined($dbh));
2294: my ($student_requirements,$enrollment_requirements) =
2295: &limit_by_section_and_status($sections,$enrollment,'d');
2296: my ($groups_join,$group_limits) = &limit_by_group($groups,'d','e','f');
2297: my $request = 'SELECT '.
2298: 'a.student_id, a.awarded, a.tries, b.timestamp '.
2299: 'FROM '.$fulldump_part_table.' AS a '.
2300: 'LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
2301: 'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
2302: 'a.transaction = b.transaction '.
2303: 'LEFT JOIN '.$student_table.' as d '.
2304: 'ON a.student_id=d.student_id '.
2305: $groups_join;
2306: my $limit = ' WHERE '.
2307: 'a.symb_id='.$symb_id.' AND a.part_id='.$part_id;
2308: if (defined($student_requirements)) {
2309: $limit .= ' AND '.$student_requirements;
2310: }
2311: if (defined($enrollment_requirements)) {
2312: $limit .= ' AND '.$enrollment_requirements;
2313: }
2314: if (defined($group_limits)) {
2315: $limit .= ' AND '.$group_limits;
2316: }
2317: $request .= $limit.' ORDER BY b.timestamp';
2318: # &Apache::lonnet::logthis("request =\n".$request);
2319: my $sth = $dbh->prepare($request);
2320: $sth->execute();
2321: if ($dbh->err) {
2322: &Apache::lonnet::logthis('error 5 = '.$dbh->errstr());
2323: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2324: return undef;
2325: }
2326: my $dataset = $sth->fetchall_arrayref();
2327: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2328: return $dataset;
2329: }
2330:
2331: }
2332:
2333: sub get_student_scores {
2334: my ($sections,$groups,$Symbs,$enrollment,$courseid,$starttime,$endtime) = @_;
2335: $courseid = $env{'request.course.id'} if (! defined($courseid));
2336: &setup_table_names($courseid);
2337: my $dbh = &Apache::lonmysql::get_dbh();
2338: return (undef) if (! defined($dbh));
2339: my $tmptable = &temp_table_name($courseid,'temp_'.time);
2340: my $request = 'DROP TABLE IF EXISTS '.$tmptable;
2341: # &Apache::lonnet::logthis('request = '.$/.$request);
2342: $dbh->do($request);
2343: #
2344: my $symb_requirements;
2345: if (defined($Symbs) && @$Symbs) {
2346: $symb_requirements = '('.
2347: join(' OR ', map{ "(a.symb_id='".&get_symb_id($_->{'symb'}).
2348: "' AND a.part_id='".&get_part_id($_->{'part'}).
2349: "')"
2350: } @$Symbs).')';
2351: }
2352: #
2353: my ($student_requirements,$enrollment_requirements) =
2354: &limit_by_section_and_status($sections,$enrollment,'b');
2355: #
2356: my ($groups_join,$group_limits) = &limit_by_group($groups,'b','d','e');
2357: my $time_requirements = &limit_by_start_end_time($starttime,$endtime,'a');
2358: ##
2359: $request = 'CREATE TEMPORARY TABLE IF NOT EXISTS '.$tmptable.
2360: ' SELECT a.student_id,SUM(a.awarded*c.weight) AS score FROM '.
2361: $performance_table.' AS a ';
2362: $request .= "LEFT JOIN ".$weight_table.' AS c ON a.symb_id=c.symb_id AND a.part_id=c.part_id ';
2363: if (defined($student_requirements) || defined($enrollment_requirements)) {
2364: $request .= ' LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id ';
2365: }
2366: if (defined($groups_join)) {
2367: $request .= $groups_join;
2368: }
2369: if (defined($symb_requirements) ||
2370: defined($student_requirements) ||
2371: defined($enrollment_requirements) ||
2372: defined($group_limits) ) {
2373: $request .= ' WHERE ';
2374: }
2375: if (defined($symb_requirements)) {
2376: $request .= $symb_requirements.' AND ';
2377: }
2378: if (defined($student_requirements)) {
2379: $request .= $student_requirements.' AND ';
2380: }
2381: if (defined($enrollment_requirements)) {
2382: $request .= $enrollment_requirements.' AND ';
2383: }
2384: if (defined($time_requirements)) {
2385: $request .= $time_requirements.' AND ';
2386: }
2387: $request =~ s/ AND $//; # Strip of the trailing ' AND '.
2388: $request .= ' GROUP BY a.student_id';
2389: # &Apache::lonnet::logthis("request = \n".$request);
2390: my $sth = $dbh->prepare($request);
2391: $sth->execute();
2392: if ($dbh->err) {
2393: &Apache::lonnet::logthis('error 6 = '.$dbh->errstr());
2394: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2395: return undef;
2396: }
2397: $request = 'SELECT score,COUNT(*) FROM '.$tmptable.' GROUP BY score';
2398: # &Apache::lonnet::logthis("request = \n".$request);
2399: $sth = $dbh->prepare($request);
2400: $sth->execute();
2401: if ($dbh->err) {
2402: &Apache::lonnet::logthis('error 7 = '.$dbh->errstr());
2403: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2404: return undef;
2405: }
2406: my $dataset = $sth->fetchall_arrayref();
2407: return $dataset;
2408: }
2409:
2410:
2411:
2412: sub setup_table_names {
2413: my ($courseid) = @_;
2414: if (! defined($courseid)) {
2415: $courseid = $env{'request.course.id'};
2416: }
2417: #
2418: if (! defined($current_course) || $current_course ne $courseid) {
2419: # Clear out variables
2420: $have_read_part_table = 0;
2421: undef(%ids_by_part);
2422: undef(%parts_by_id);
2423: $have_read_symb_table = 0;
2424: undef(%ids_by_symb);
2425: undef(%symbs_by_id);
2426: $have_read_student_table = 0;
2427: undef(%ids_by_student);
2428: undef(%students_by_id);
2429: $have_read_groupnames_table = 0;
2430: undef(%ids_by_groupname);
2431: #
2432: $current_course = $courseid;
2433: }
2434: #
2435: # Set up database names
2436: my $base_id = 'md5_'.&Digest::MD5::md5_hex($courseid);
2437: $symb_table = $base_id.'_'.'symb';
2438: $part_table = $base_id.'_'.'part';
2439: $student_table = $base_id.'_'.'student';
2440: $groupnames_table = $base_id.'_'.'groupnames';
2441: $students_groups_table = $base_id.'_'.'studentgroups';
2442: $performance_table = $base_id.'_'.'performance';
2443: $parameters_table = $base_id.'_'.'parameters';
2444: $fulldump_part_table = $base_id.'_'.'partdata';
2445: $fulldump_response_table = $base_id.'_'.'responsedata';
2446: $fulldump_timestamp_table = $base_id.'_'.'timestampdata';
2447: $weight_table = $base_id.'_'.'weight';
2448: #
2449: @Tables = (
2450: $symb_table,
2451: $part_table,
2452: $student_table,
2453: $groupnames_table,
2454: $students_groups_table,
2455: $performance_table,
2456: $parameters_table,
2457: $fulldump_part_table,
2458: $fulldump_response_table,
2459: $fulldump_timestamp_table,
2460: $weight_table,
2461: );
2462: return;
2463: }
2464:
2465: sub temp_table_name {
2466: my ($courseid,$affix) = @_;
2467: my $base_id = 'md5_'.&Digest::MD5::md5_hex($courseid);
2468: return $base_id.'_'.$affix;
2469: }
2470:
2471:
2472: } # End scope of table identifiers
2473:
2474:
2475:
2476: sub CL_SDOM { return 0; }
2477: sub CL_SNAME { return 1; }
2478: sub CL_END { return 2; }
2479: sub CL_START { return 3; }
2480: sub CL_ID { return 4; }
2481: sub CL_SECTION { return 5; }
2482: sub CL_FULLNAME { return 6; }
2483: sub CL_STATUS { return 7; }
2484: sub CL_TYPE { return 8; }
2485: sub CL_LOCKEDTYPE { return 9; }
2486: sub CL_CREDITS { return 10; }
2487: sub CL_INSTSEC { return 11; }
2488: sub CL_GROUP { return 12; }
2489: sub CL_PERMANENTEMAIL { return 13; }
2490: sub CL_ROLE { return 14; }
2491: sub CL_EXTENT { return 15; }
2492: sub CL_PHOTO { return 16; }
2493: sub CL_THUMBNAIL { return 17; }
2494: sub CL_AUTHORQUOTA { return 18; }
2495: sub CL_AUTHORUSAGE { return 19; }
2496:
2497: sub get_classlist {
2498: my ($cdom,$cnum) = @_;
2499: my $cid = $cdom.'_'.$cnum;
2500: if (!defined($cdom) || !defined($cnum)) {
2501: $cid = $env{'request.course.id'};
2502: $cdom = $env{'course.'.$cid.'.domain'};
2503: $cnum = $env{'course.'.$cid.'.num'};
2504: }
2505: my $now = time;
2506: #
2507: my %classlist=&Apache::lonnet::dump('classlist',$cdom,$cnum);
2508: while (my ($student,$info) = each(%classlist)) {
2509: if ($student =~ /^(con_lost|error|no_such_host)/i) {
2510: &Apache::lonnet::logthis('get_classlist error for '.$cid.':'.$student);
2511: return undef;
2512: }
2513: my ($sname,$sdom) = split(/:/,$student);
2514: my @Values = split(/:/,$info);
2515: my ($end,$start,$id,$section,$fullname,$type,$lockedtype,$credits,$instsec);
2516: if (@Values > 2) {
2517: ($end,$start,$id,$section,$fullname,$type,$lockedtype,$credits,$instsec) = @Values;
2518: } else { # We have to get the data ourselves
2519: ($end,$start) = @Values;
2520: $section = &Apache::lonnet::getsection($sdom,$sname,$cid);
2521: my %info=&Apache::lonnet::get('environment',
2522: ['firstname','middlename',
2523: 'lastname','generation','id'],
2524: $sdom, $sname);
2525: my ($tmp) = keys(%info);
2526: if ($tmp =~/^(con_lost|error|no_such_host)/i) {
2527: $fullname = 'not available';
2528: $id = 'not available';
2529: &Apache::lonnet::logthis('unable to retrieve environment '.
2530: 'for '.$sname.':'.$sdom);
2531: } else {
2532: $fullname = &Apache::lonnet::format_name(@info{qw/firstname middlename lastname generation/},'lastname');
2533: $id = $info{'id'};
2534: }
2535: # Update the classlist with this students information
2536: if ($fullname ne 'not available') {
2537: my $enrolldata = join(':',$end,$start,$id,$section,$fullname);
2538: my $reply=&Apache::lonnet::cput('classlist',
2539: {$student => $enrolldata},
2540: $cdom,$cnum);
2541: if ($reply !~ /^(ok|delayed)/) {
2542: &Apache::lonnet::logthis('Unable to update classlist for '.
2543: 'student '.$sname.':'.$sdom.
2544: ' error:'.$reply);
2545: }
2546: }
2547: }
2548: my $status='Expired';
2549: if(((!$end) || $now < $end) && ((!$start) || ($now > $start))) {
2550: $status='Active';
2551: }
2552: if(($now < $start) && ((!$end) || $now < $end )) {
2553: $status='Future';
2554: }
2555: $classlist{$student} =
2556: [$sdom,$sname,$end,$start,$id,$section,$fullname,$status,$type,
2557: $lockedtype,$credits,$instsec];
2558: }
2559: if (wantarray()) {
2560: return (\%classlist,['domain','username','end','start','id',
2561: 'section','fullname','status','type',
2562: 'lockedtype','credits','instsec']);
2563: } else {
2564: return \%classlist;
2565: }
2566: }
2567:
2568: sub get_group_memberships {
2569: my ($classlist,$keylist,$cdom,$cnum) = @_;
2570:
2571: return ({},{}) if (!ref($classlist) || !ref($keylist));
2572:
2573: my $cid = $cdom.'_'.$cnum;
2574: if (!defined($cdom) || !defined($cnum)) {
2575: $cid = $env{'request.course.id'};
2576: $cdom = $env{'course.'.$cid.'.domain'};
2577: $cnum = $env{'course.'.$cid.'.num'};
2578: }
2579: my (%classgroups,%studentgroups);
2580: my $now = time;
2581: my $access_end = $env{'course.'.$cid.'.default_enrollment_end_date'};
2582: my %curr_groups =&Apache::longroup::coursegroups($cdom,$cnum);
2583: if (%curr_groups) {
2584: my $grpindex = &CL_GROUP();
2585: my %groupmemberhash =
2586: &Apache::lonnet::get_group_membership($cdom,$cnum);
2587: foreach my $student (keys(%{$classlist})) {
2588: %{$classgroups{$student}} = ();
2589: my $hasgroup = 0;
2590: foreach my $status ('previous','future','active','aftercourse') {
2591: %{$classgroups{$student}{$status}} = ();
2592: }
2593: foreach my $group (keys(%curr_groups)) {
2594: if (defined($groupmemberhash{$group.':'.$student})) {
2595: my ($end,$start) = split(/:/,$groupmemberhash{$group.':'.
2596: $student});
2597: if ($start == -1) {
2598: next;
2599: } else {
2600: $studentgroups{$group} ++;
2601: $hasgroup = 1;
2602: if ($end && $end < $now) {
2603: $classgroups{$student}{'previous'}{$group} =
2604: $groupmemberhash{$group.':'.$student};
2605: if ($classlist->{$student}[&CL_STATUS()] eq 'Expired') {
2606: if ($access_end && $access_end < $now) {
2607: if ($access_end - $end < 86400) {
2608: $classgroups{$student}{'aftercourse'}{$group} = $groupmemberhash{$group.':'.$student};
2609: }
2610: }
2611: }
2612: } elsif ($now > $start) {
2613: if (!$end || $end > $now) {
2614: $classgroups{$student}{'active'}{$group} =
2615: $groupmemberhash{$group.':'.$student};
2616: }
2617: } else {
2618: $classgroups{$student}{'future'}{$group} =
2619: $groupmemberhash{$group.':'.$student};
2620: }
2621: }
2622: }
2623: }
2624: if (!$hasgroup) {
2625: $studentgroups{'none'} ++;
2626: } else {
2627: $classlist->{$student}->[$grpindex] = join(',',
2628: sort(keys(%{$classgroups{$student}{'active'}})));
2629: }
2630: }
2631: }
2632: return (\%classgroups,\%studentgroups);
2633: }
2634:
2635: sub get_students_groups {
2636: my ($student,$enrollment_status,$classgroups) = @_;
2637: my @studentsgroups = ();
2638: if (ref($$classgroups{$student}{'active'}) eq 'HASH') {
2639: push(@studentsgroups,keys(%{$$classgroups{$student}{'active'}}));
2640: }
2641: if ($enrollment_status eq 'Any') {
2642: foreach my $status ('previous','future') {
2643: if (ref($$classgroups{$student}{$status}) eq 'HASH') {
2644: push(@studentsgroups,keys(%{$$classgroups{$student}{$status}}));
2645: }
2646: }
2647: } else {
2648: if (ref($$classgroups{$student}{'aftercourse'}) eq 'HASH') {
2649: push(@studentsgroups,keys(%{$$classgroups{$student}{'aftercourse'}}));
2650: }
2651: }
2652: return @studentsgroups;
2653: }
2654:
2655:
2656: # ----- END HELPER FUNCTIONS --------------------------------------------
2657:
2658: 1;
2659: __END__
2660:
2661:
2662: =pod
2663:
2664: =head1 NAME
2665:
2666: Apache::loncoursedata
2667:
2668: =head1 SYNOPSIS
2669:
2670: Set of functions that download and process student and course information.
2671:
2672: =head1 PACKAGES USED
2673:
2674: Apache::lonnet
2675: Apache::longroup
2676: Time::HiRes
2677: Apache::lonmysql
2678: LONCAPA
2679: Digest::MD5
2680:
2681: =head1 DOWNLOAD INFORMATION
2682:
2683: This section contains all the functions that get data from other servers
2684: and/or itself.
2685:
2686:
2687:
2688: =head1 LOCAL DATA CACHING SUBROUTINES
2689:
2690: The local caching is done using MySQL. There is no fall-back implementation
2691: if MySQL is not running.
2692:
2693: The programmers interface is to call &get_current_state() or some other
2694: primary interface subroutine (described below). The internals of this
2695: storage system are documented here.
2696:
2697: There are six tables used to store student performance data (the results of
2698: a dumpcurrent). Each of these tables is created in MySQL with a name of
2699: $courseid_*****, where ***** is 'symb', 'part', or whatever is appropriate
2700: for the table. The tables and their purposes are described below.
2701:
2702: Some notes before we get started.
2703:
2704: Each table must have a PRIMARY KEY, which is a column or set of columns which
2705: will serve to uniquely identify a row of data. NULL is not allowed!
2706:
2707: INDEXes work best on integer data.
2708:
2709: JOIN is used to combine data from many tables into one output.
2710:
2711: lonmysql.pm is used for some of the interface, specifically the table creation
2712: calls. The inserts are done in bulk by directly calling the database handler.
2713: The SELECT ... JOIN statement used to retrieve the data does not have an
2714: interface in lonmysql.pm and I shudder at the thought of writing one.
2715:
2716: =head2 Table Descriptions
2717:
2718: =over 4
2719:
2720: =head2 Tables used to store meta information
2721:
2722: The following tables hold data required to keep track of the current status
2723: of a students data in the tables or to look up the students data in the tables.
2724:
2725: =over 4
2726:
2727: =item C<$symb_table>
2728:
2729: The symb_table has two columns. The first is a 'symb_id' and the second
2730: is the text name for the 'symb' (limited to 64k). The 'symb_id' is generated
2731: automatically by MySQL so inserts should be done on this table with an
2732: empty first element. This table has its PRIMARY KEY on the 'symb_id'.
2733:
2734: =item C<$part_table>
2735:
2736: The part_table has two columns. The first is a 'part_id' and the second
2737: is the text name for the 'part' (limited to 100 characters). The 'part_id' is
2738: generated automatically by MySQL so inserts should be done on this table with
2739: an empty first element. This table has its PRIMARY KEY on the 'part' (100
2740: characters) and a KEY on 'part_id'.
2741:
2742: =item C<$student_table>
2743:
2744: The student_table has 7 columns. The first is a 'student_id' assigned by
2745: MySQL. The second is 'student' which is username:domain. The third through
2746: fifth are 'section', 'status' (enrollment status), and 'classification'
2747: (to be used in the future). The sixth and seventh ('updatetime' and
2748: 'fullupdatetime') contain the time of last update and full update of student
2749: data. This table has its PRIMARY KEY on the 'student_id' column and is indexed
2750: on 'student', 'section', and 'status'.
2751:
2752: =item C<$groupnames_table>
2753:
2754: The groupnames_table has 2 columns. The first is a 'group_id' assigned by
2755: MySQL. The second is 'groupname' which is the name of the group in the course.
2756:
2757: =item C<$students_groups_table>
2758:
2759: The students_groups_table has 2 columns. The first is the 'student_id', and the
2760: second is the 'group_id'. These two columns comprise the PRIMARY KEY for this
2761: table, as an individual student may be affiliated with more than one group at
2762: any time. This table is indexed on both student_id and group_id.
2763:
2764: =back
2765:
2766: =head2 Tables used to store current status data
2767:
2768: The following tables store data only about the students current status on
2769: a problem, meaning only the data related to the last attempt on a problem.
2770:
2771: =over 4
2772:
2773: =item C<$performance_table>
2774:
2775: The performance_table has 9 columns. The first three are 'symb_id',
2776: 'student_id', and 'part_id'. These comprise the PRIMARY KEY for this table
2777: and are directly related to the $symb_table, $student_table, and $part_table
2778: described above. MySQL does better indexing on numeric items than text,
2779: so we use these three "index tables". The remaining columns are
2780: 'solved', 'tries', 'awarded', 'award', 'awarddetail', and 'timestamp'.
2781: These are either the MySQL type TINYTEXT or various integers ('tries' and
2782: 'timestamp'). This table has KEYs of 'student_id' and 'symb_id'.
2783: For use of this table, see the functions described below.
2784:
2785: =item C<$parameters_table>
2786:
2787: The parameters_table holds the data that does not fit neatly into the
2788: performance_table. The parameters table has four columns: 'symb_id',
2789: 'student_id', 'parameter', and 'value'. 'symb_id', 'student_id', and
2790: 'parameter' comprise the PRIMARY KEY for this table. 'parameter' is
2791: limited to 255 characters. 'value' is limited to 64k characters.
2792:
2793: =back
2794:
2795: =head2 Tables used for storing historic data
2796:
2797: The following tables are used to store almost all of the transactions a student
2798: has made on a homework problem. See loncapa/docs/homework/datastorage for
2799: specific information about each of the parameters stored.
2800:
2801: =over 4
2802:
2803: =item C<$fulldump_response_table>
2804:
2805: The response table holds data (documented in loncapa/docs/homework/datastorage)
2806: associated with a particular response id which is stored when a student
2807: attempts a problem. The following are the columns of the table, in order:
2808: 'symb_id','part_id','response_id','student_id','transaction','tries',
2809: 'awarddetail', 'response_specific', 'response_specific_value',
2810: 'response_specific_2', 'response_specific_value_2', and 'submission
2811: (the text of the students submission). The primary key is based on the
2812: first five columns listed above.
2813:
2814: =item C<$fulldump_part_table()>
2815:
2816: The part table holds data (documented in loncapa/docs/homework/datastorage)
2817: associated with a particular part id which is stored when a student attempts
2818: a problem. The following are the columns of the table, in order:
2819: 'symb_id','part_id','student_id','transaction','tries','award','awarded',
2820: and 'previous'. The primary key is based on the first five columns listed
2821: above.
2822:
2823: =item C<$fulldump_timestamp_table()>
2824:
2825: The timestamp table holds the timestamps of the transactions which are
2826: stored in $fulldump_response_table and $fulldump_part_table. This data is
2827: about both the response and part data. Columns: 'symb_id','student_id',
2828: 'transaction', and 'timestamp'.
2829: The primary key is based on the first 3 columns.
2830:
2831: =item C<$weight_table()>
2832:
2833: The weight table holds the weight for the problems used in the class.
2834: Whereas the weight of a problem can vary by section and student the data
2835: here is applied to the class as a whole.
2836: Columns: 'symb_id','part_id','response_id','weight'.
2837:
2838: =back
2839:
2840:
2841: =head1 IMPORTANT SUBROUTINES
2842:
2843: Here is a brief overview of the subroutines which are likely to be of
2844: interest:
2845:
2846: =over 4
2847:
2848: =item C<&get_current_state()>
2849:
2850: programmers interface.
2851:
2852: =item C<&init_dbs()>
2853:
2854: table creation
2855:
2856: =item C<&update_student_data()>
2857:
2858: data storage calls
2859:
2860: =item C<&get_student_data_from_performance_cache()>
2861:
2862: data retrieval
2863:
2864: =back
2865:
2866: =head1 OTHER SUBROUTINES
2867:
2868: =over 4
2869:
2870: =item C<&make_into_hash($values)>
2871:
2872: Returns a reference to a hash as described by $values. $values is
2873: assumed to be the result of
2874: join(':',map {&escape($_)} %orighash);
2875:
2876: This is a helper function for get_current_state.
2877:
2878: =item C<&init_dbs()>
2879:
2880: Input: course id
2881:
2882: Output: 0 on success, positive integer on error
2883:
2884: This routine issues the calls to lonmysql to create the tables used to
2885: store student data.
2886:
2887: item C<&delete_caches()>
2888:
2889: This routine drops all the tables associated with a course from the
2890: MySQL database.
2891:
2892: Input: course id (optional, determined by environment if omitted)
2893:
2894: Returns: nothing
2895:
2896: =item C<&get_part_id()>
2897:
2898: Get the MySQL id of a problem part string.
2899:
2900: Input: $part
2901:
2902: Output: undef on error, integer $part_id on success.
2903:
2904: =item C<&get_part()>
2905:
2906: Get the string describing a part from the MySQL id of the problem part.
2907:
2908: Input: $part_id
2909:
2910: Output: undef on error, $part string on success.
2911:
2912: =item C<&get_symb_id()>
2913:
2914: Get the MySQL id of a symb.
2915:
2916: Input: $symb
2917:
2918: Output: undef on error, integer $symb_id on success.
2919:
2920: =item C<&get_symb()>
2921:
2922: Get the symb associated with a MySQL symb_id.
2923:
2924: Input: $symb_id
2925:
2926: Output: undef on error, $symb on success.
2927:
2928: =item C<&get_student_id()>
2929:
2930: Get the MySQL id of a student.
2931:
2932: Input: $sname, $dom
2933:
2934: Output: undef on error, integer $student_id on success.
2935:
2936: =item C<&get_student()>
2937:
2938: Get student username:domain associated with the MySQL student_id.
2939:
2940: Input: $student_id
2941:
2942: Output: undef on error, string $student (username:domain) on success.
2943:
2944: =item C<&clear_internal_caches()>
2945:
2946: Causes the internal caches used in get_student_id, get_student,
2947: get_symb_id, get_symb, get_part_id, and get_part to be undef'd.
2948:
2949: Needs to be called before the first operation with the MySQL database
2950: for a given Apache request.
2951:
2952: =item C<&update_full_student_data($sname,$sdom,$courseid)>
2953:
2954: Does a lonnet::dump on a student to populate the courses tables.
2955:
2956: Input: $sname, $sdom, $courseid
2957:
2958: Output: $returnstatus
2959:
2960: $returnstatus is a string describing any errors that occurred. 'okay' is the
2961: default.
2962:
2963: This subroutine loads a students data using lonnet::dump and inserts
2964: it into the MySQL database. The inserts are done on three tables,
2965: $fulldump_response_table, $fulldump_part_table, and $fulldump_timestamp_table.
2966: The INSERT calls are made directly by this subroutine, not through lonmysql
2967: because we do a 'bulk'insert which takes advantage of MySQLs non-SQL
2968: compliant INSERT command to insert multiple rows at a time.
2969: If anything has gone wrong during this process, $returnstatus is updated with
2970: a description of the error.
2971:
2972: Once the "fulldump" tables are updated, the tables used for chart and
2973: spreadsheet (which hold only the current state of the student on their
2974: homework, not historical data) are updated. If all updates have occurred
2975: successfully, $student_table is updated to reflect the time of the update.
2976:
2977: Notice we do not insert the data and immediately query it. This means it
2978: is possible for there to be data returned this first time that is not
2979: available the second time. CYA.
2980:
2981:
2982: =item C<&update_student_data()>
2983:
2984: Input: $sname, $sdom, $courseid
2985:
2986: Output: $returnstatus, \%student_data
2987:
2988: $returnstatus is a string describing any errors that occurred. 'okay' is the
2989: default.
2990: \%student_data is the data returned by a call to lonnet::currentdump.
2991:
2992: This subroutine loads a students data using lonnet::currentdump and inserts
2993: it into the MySQL database. The inserts are done on two tables,
2994: $performance_table and $parameters_table. $parameters_table holds the data
2995: that is not included in $performance_table. See the description of
2996: $performance_table elsewhere in this file. The INSERT calls are made
2997: directly by this subroutine, not through lonmysql because we do a 'bulk'
2998: insert which takes advantage of MySQLs non-SQL compliant INSERT command to
2999: insert multiple rows at a time. If anything has gone wrong during this
3000: process, $returnstatus is updated with a description of the error and
3001: \%student_data is returned.
3002:
3003: Notice we do not insert the data and immediately query it. This means it
3004: is possible for there to be data returned this first time that is not
3005: available the second time. CYA.
3006:
3007: =item &ensure_tables_are_set_up($courseid)
3008:
3009: Checks to be sure the MySQL tables for the given class are set up.
3010: If $courseid is omitted it will be obtained from the environment.
3011:
3012: Returns nothing on success and 'error' on failure
3013:
3014:
3015: =item C<&ensure_current_data()>
3016:
3017: Input: $sname, $sdom, $courseid
3018:
3019: Output: $status, $data
3020:
3021: This routine ensures the data for a given student is up to date.
3022: The $student_table is queried to determine the time of the last update.
3023: If the students data is out of date, &update_student_data() is called.
3024: The return values from the call to &update_student_data() are returned.
3025:
3026: =item C<&ensure_current_full_data($sname,$sdom,$courseid)>
3027:
3028: Input: $sname, $sdom, $courseid
3029:
3030: Output: $status
3031:
3032: This routine ensures the fulldata (the data from a lonnet::dump, not a
3033: lonnet::currentdump) for a given student is up to date.
3034: The $student_table is queried to determine the time of the last update.
3035: If the students fulldata is out of date, &update_full_student_data() is
3036: called.
3037:
3038: The return value from the call to &update_full_student_data() is returned.
3039:
3040: =item C<&get_student_data_from_performance_cache()>
3041:
3042: Input: $sname, $sdom, $symb, $courseid
3043:
3044: Output: hash reference containing the data for the given student.
3045: If $symb is undef, all the students data is returned.
3046:
3047: This routine is the heart of the local caching system. See the description
3048: of $performance_table, $symb_table, $student_table, and $part_table. The
3049: main task is building the MySQL request. The tables appear in the request
3050: in the order in which they should be parsed by MySQL. When searching
3051: on a student the $student_table is used to locate the 'student_id'. All
3052: rows in $performance_table which have a matching 'student_id' are returned,
3053: with data from $part_table and $symb_table which match the entries in
3054: $performance_table, 'part_id' and 'symb_id'. When searching on a symb,
3055: the $symb_table is processed first, with matching rows grabbed from
3056: $performance_table and filled in from $part_table and $student_table in
3057: that order.
3058:
3059: Running 'EXPLAIN ' on the 'SELECT' statements generated can be quite
3060: interesting, especially if you play with the order the tables are listed.
3061:
3062:
3063: =item C<&get_current_state()>
3064:
3065: Input: $sname,$sdom,$symb,$courseid
3066:
3067: Output: Described below
3068:
3069: Retrieve the current status of a students performance. $sname and
3070: $sdom are the only required parameters. If $symb is undef the results
3071: of an &Apache::lonnet::currentdump() will be returned.
3072: If $courseid is undef it will be retrieved from the environment.
3073:
3074: The return structure is based on &Apache::lonnet::currentdump. If
3075: $symb is unspecified, all the students data is returned in a hash of
3076: the form:
3077: (
3078: symb1 => { param1 => value1, param2 => value2 ... },
3079: symb2 => { param1 => value1, param2 => value2 ... },
3080: )
3081:
3082: If $symb is specified, a hash of
3083: (
3084: param1 => value1,
3085: param2 => value2,
3086: )
3087: is returned.
3088:
3089: If no data is found for $symb, or if the student has no performance data,
3090: an empty list is returned.
3091:
3092: =item C<&get_problem_statistics()>
3093:
3094: Gather data on a given problem. The database is assumed to be
3095: populated and all local caching variables are assumed to be set
3096: properly. This means you need to call &ensure_current_data for
3097: the students you are concerned with prior to calling this routine.
3098:
3099: Inputs: $Sections, Groups, $status, $symb, $part, $courseid, $starttime,
3100: $endtime
3101:
3102: =over 4
3103:
3104: =item $Sections Array ref containing section names for students.
3105: 'all' is allowed to be the first (and only) item in the array.
3106:
3107: =item $Groups Array ref containing group names for students.
3108: 'all' is allowed to be the first (and only) item in the array.
3109:
3110: =item $status String describing the status of students
3111:
3112: =item $symb is the symb for the problem.
3113:
3114: =item $part is the part id you need statistics for
3115:
3116: =item $courseid is the course id, of course!
3117:
3118: =item $starttime and $endtime are unix times which to use to limit
3119: the statistical data.
3120:
3121: =back
3122:
3123: Outputs: See the code for up to date information. A hash reference is
3124: returned. The hash has the following keys defined:
3125:
3126: =over 4
3127:
3128: =item * num_students
3129:
3130: The number of students attempting the problem
3131:
3132: =item tries
3133:
3134: The total number of tries for the students
3135:
3136: =item max_tries
3137:
3138: The maximum number of tries taken
3139:
3140: =item mean_tries
3141:
3142: The average number of tries
3143:
3144: =item num_solved T
3145:
3146: he number of students able to solve the problem
3147:
3148: =item num_override
3149:
3150: The number of students whose answer is 'correct_by_override'
3151:
3152: =item deg_of_diff
3153:
3154: The degree of difficulty of the problem
3155:
3156: =item std_tries
3157:
3158: The standard deviation of the number of tries
3159:
3160: =item skew_tries
3161:
3162: The skew of the number of tries
3163:
3164: =item per_wrong
3165:
3166: The number of students attempting the problem who were not
3167: able to answer it correctly.
3168:
3169: =back
3170:
3171: =item C<&populate_weight_table()>
3172:
3173: =item C<&limit_by_start_end_times()>
3174:
3175: Build SQL WHERE condition which limits the data collected by the start
3176: and end times provided
3177:
3178: Inputs: $starttime, $endtime, $table
3179:
3180: Returns: $time_limits
3181:
3182:
3183: =item C<&limit_by_section_and_status()C>
3184:
3185: Build SQL WHERE condition which limits the data collected by section and
3186: student status.
3187:
3188: Inputs: $Sections (array ref)
3189: $enrollment (string: 'any', 'expired', 'active')
3190: $tablename The name of the table that holds the student data
3191:
3192: Returns: $student_requirements,$enrollment_requirements
3193:
3194: =item C<&limit_by_group()>
3195:
3196: Build SQL LEFT JOIN statement to include students_groups and groupnames tables and SQL WHERE condition which limits the data collected by group.
3197:
3198: Inputs: $Groups (array ref)
3199: $stutable The name of the table which holds the student data.
3200: $grptable The name of the table which maps group_id to groupname.
3201: $stugrptab The name of the table which holds student group affiliations.
3202: Returns: $groups_join,$group_limits
3203: $groups_join JOIN part of SQL statement (to include group related tables)
3204: $group_limits SQL WHERE condition limiting to requested groups
3205:
3206: =item C<rank_students_by_scores_on_resources()>
3207:
3208: Inputs:
3209: $resources: array ref of hash ref. Each hash ref needs key 'symb'.
3210: $Sections: array ref of sections to include,
3211: $Groups: array ref of groups to include.
3212: $enrollment: string,
3213: $courseid (may be omitted)
3214: $starttime (may be omitted)
3215: $endtime (may be omitted)
3216: $has_award_for (may be omitted)
3217:
3218: Returns; An array of arrays. The sub arrays contain a student name and
3219: their score on the resources. $starttime and $endtime constrain the
3220: list to awards obtained during the given time limits. $has_score_on
3221: constrains the list to those students who at least attempted the
3222: resource identified by the given symb, which is used to filter out
3223: such students for statistics that would be adversely affected by such
3224: students.
3225:
3226: =item C<&get_sum_of_scores>
3227:
3228: Inputs: $resource (hash ref, needs {'symb'} key),
3229: $part, (the part id),
3230: $students (array ref, contents of array are scalars holding 'sname:sdom'),
3231: $courseid
3232:
3233: Returns: the sum of the score on the problem part over the students and the
3234: maximum possible value for the sum (taken from the weight table).
3235:
3236:
3237: =item C<&score_stats()>
3238:
3239: Inputs: $Sections, $enrollment, $symbs, $starttime,
3240: $endtime, $courseid
3241:
3242: $Sections, $enrollment, $starttime, $endtime, and $courseid are the same as
3243: elsewhere in this module.
3244: $symbs is an array ref of symbs
3245:
3246: Returns: minimum, maximum, mean, s.d., number of students, and maximum
3247: possible of student scores on the given resources
3248:
3249: =item C<&count_stats()>
3250:
3251: Inputs: $Sections, $Groups, $enrollment, $symbs, $starttime,
3252: $endtime, $courseid
3253:
3254: $Sections, $Groups $enrollment, $starttime, $endtime, and $courseid are the
3255: same as elsewhere in this module.
3256: $symbs is an array ref of symbs
3257:
3258: Returns: minimum, maximum, mean, s.d., and number of students
3259: of the number of items correct on the given resources
3260:
3261: =item C<get_student_data()>
3262:
3263: =item C<&get_student_scores($Sections,$Groups,$Symbs,$enrollment,$courseid)>
3264:
3265: =item C<&setup_table_names()>
3266:
3267: input: course id
3268:
3269: output: none
3270:
3271: =back
3272:
3273: =head3 End of Local Data Caching Subroutines
3274:
3275: =head3 Classlist Subroutines
3276:
3277: =over
3278:
3279: =item &get_classlist();
3280:
3281: Retrieve the classist of a given class or of the current class. Student
3282: information is returned from the classlist.db file and, if needed,
3283: from the students environment.
3284:
3285: Optional arguments are $cdom, and $cnum (course domain,
3286: and course number, respectively). If either is ommitted the course
3287: will be taken from the current environment ($env{'request.course.id'},
3288: $env{'course.'.$cid.'.domain'}, and $env{'course.'.$cid.'.num'}).
3289:
3290: Returns a reference to a hash which contains:
3291: keys '$sname:$sdom'
3292: values [$sdom,$sname,$end,$start,$id,$section,$fullname,$status,$type,
3293: $lockedtype,$credits,$instsec]
3294:
3295: The constant values CL_SDOM, CL_SNAME, CL_END, etc. can be used
3296: as indices into the returned list to future-proof clients against
3297: changes in the list order.
3298:
3299: =back
3300:
3301: =cut
3302:
3303:
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