1: # The LearningOnline Network with CAPA
2: #
3: # $Id: loncoursedata.pm,v 1.201.2.2 2018/03/14 17:07:29 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: my ($max,$min) = &execute_SQL_request($dbh,$request);
1681: #
1682: $request = 'SELECT SUM(awarded) FROM '.$stats_table;
1683: my ($Solved) = &execute_SQL_request($dbh,$request);
1684: #
1685: $request = 'SELECT SUM(awarded) FROM '.$stats_table.
1686: " WHERE solved='correct_by_override'";
1687: my ($solved) = &execute_SQL_request($dbh,$request);
1688: #
1689: $Solved -= $solved;
1690: #
1691: $num = 0 if (! defined($num));
1692: $tries = 0 if (! defined($tries));
1693: $max = 0 if (! defined($max));
1694: $min = 0 if (! defined($min));
1695: $STD = 0 if (! defined($STD));
1696: $Solved = 0 if (! defined($Solved) || $Solved < 0);
1697: $solved = 0 if (! defined($solved));
1698: #
1699: # Compute the more complicated statistics
1700: my $DegOfDiff = 'nan';
1701: $DegOfDiff = 1-($Solved)/$tries if ($tries>0);
1702: #
1703: my $SKEW = 'nan';
1704: my $wrongpercent = 0;
1705: my $numwrong = 'nan';
1706: if ($num > 0) {
1707: ($SKEW) = &execute_SQL_request($dbh,'SELECT SQRT(SUM('.
1708: 'POWER(tries - '.$STD.',3)'.
1709: '))/'.$num.' FROM '.$stats_table);
1710: $numwrong = $num-$Solved;
1711: $wrongpercent=int(10*100*$numwrong/$num)/10;
1712: }
1713: #
1714: # Drop the temporary table
1715: $dbh->do('DROP TABLE '.$stats_table); # May return an error
1716: #
1717: # Return result
1718: return { num_students => $num,
1719: tries => $tries,
1720: max_tries => $max,
1721: min_tries => $min,
1722: mean_tries => $mean,
1723: std_tries => $STD,
1724: skew_tries => $SKEW,
1725: num_solved => $Solved,
1726: num_override => $solved,
1727: num_wrong => $numwrong,
1728: per_wrong => $wrongpercent,
1729: deg_of_diff => $DegOfDiff };
1730: }
1731:
1732: ##
1733: ## This is a helper for get_statistics
1734: sub execute_SQL_request {
1735: my ($dbh,$request)=@_;
1736: # &Apache::lonnet::logthis($request);
1737: my $sth = $dbh->prepare($request);
1738: if (!$sth) {
1739: die($dbh->errstr . " SQL: $request");
1740: }
1741: $sth->execute();
1742: my $row = $sth->fetchrow_arrayref();
1743: if (ref($row) eq 'ARRAY' && scalar(@$row)>0) {
1744: return @$row;
1745: }
1746: return ();
1747: }
1748:
1749:
1750: sub populate_weight_table {
1751: my ($courseid) = @_;
1752: if (! defined($courseid)) {
1753: $courseid = $env{'request.course.id'};
1754: }
1755: #
1756: &setup_table_names($courseid);
1757: my $navmap = Apache::lonnavmaps::navmap->new();
1758: if (!defined($navmap)) {
1759: &Apache::lonnet::logthis('loncoursedata::populate_weight_table:'.$/.
1760: ' unable to get navmaps resource'.$/.
1761: ' '.join(' ',(caller)));
1762: return;
1763: }
1764: my @sequences = $navmap->retrieveResources(undef,
1765: sub { shift->is_map(); },1,0,1);
1766: my @resources;
1767: foreach my $seq (@sequences) {
1768: push(@resources,$navmap->retrieveResources($seq,
1769: sub {shift->is_problem();},
1770: 0,0,0));
1771: }
1772: if (! scalar(@resources)) {
1773: &Apache::lonnet::logthis('loncoursedata::populate_weight_table:'.$/.
1774: ' no resources returned for '.$courseid);
1775: return;
1776: }
1777: # Since we use lonnet::EXT to retrieve problem weights,
1778: # to ensure current data we must clear the caches out.
1779: &Apache::lonnet::clear_EXT_cache_status();
1780: my $dbh = &Apache::lonmysql::get_dbh();
1781: my $request = 'INSERT IGNORE INTO '.$weight_table.
1782: "(symb_id,part_id,weight) VALUES ";
1783: my $weight;
1784: foreach my $res (@resources) {
1785: my $symb_id = &get_symb_id($res->symb);
1786: foreach my $part (@{$res->parts}) {
1787: my $part_id = &get_part_id($part);
1788: $weight = &Apache::lonnet::EXT('resource.'.$part.'.weight',
1789: $res->symb,
1790: undef,undef,undef);
1791: if (!defined($weight) || ($weight eq '')) {
1792: $weight=1;
1793: }
1794: $request .= "('".$symb_id."','".$part_id."','".$weight."'),";
1795: }
1796: }
1797: $request =~ s/(,)$//;
1798: # &Apache::lonnet::logthis('request = '.$/.$request);
1799: $dbh->do($request);
1800: if ($dbh->err()) {
1801: &Apache::lonnet::logthis("error ".$dbh->errstr().
1802: " occurred executing \n".
1803: $request);
1804: }
1805: return;
1806: }
1807:
1808: sub limit_by_start_end_time {
1809: my ($starttime,$endtime,$table) = @_;
1810: my $time_requirements = undef;
1811: if (defined($starttime)) {
1812: $time_requirements .= $table.".timestamp>='".$starttime."'";
1813: if (defined($endtime)) {
1814: $time_requirements .= " AND ".$table.".timestamp<='".$endtime."'";
1815: }
1816: } elsif (defined($endtime)) {
1817: $time_requirements .= $table.".timestamp<='".$endtime."'";
1818: }
1819: return $time_requirements;
1820: }
1821:
1822:
1823: sub limit_by_section_and_status {
1824: my ($Sections,$enrollment,$tablename) = @_;
1825: my $student_requirements = undef;
1826: if ( (defined($Sections) && $Sections->[0] ne 'all')) {
1827: $student_requirements = '('.
1828: join(' OR ', map { $tablename.".section='".$_."'" } @$Sections
1829: ).')';
1830: }
1831: my $enrollment_requirements=undef;
1832: if (defined($enrollment) && $enrollment ne 'Any') {
1833: my $now = time();
1834: if ( $enrollment eq 'Future' ) {
1835: $enrollment_requirements =
1836: "( $tablename.start > $now AND ".
1837: "( $tablename.end = 0 OR $tablename.end > $now))";
1838: } elsif ( $enrollment eq 'Active' ) {
1839: $enrollment_requirements =
1840: "(( $tablename.start = 0 OR $tablename.start < $now ) AND ".
1841: " ( $tablename.end = 0 OR $tablename.end > $now ))";
1842: } elsif ( $enrollment eq 'Expired' ) {
1843: $enrollment_requirements =
1844: "(( $tablename.start < $now ) AND ".
1845: " ( $tablename.end < $now ))";
1846: }
1847: }
1848: return ($student_requirements,$enrollment_requirements);
1849: }
1850:
1851:
1852:
1853: sub limit_by_group {
1854: my ($Groups,$stutable,$grptable,$stugrptab) = @_;
1855: my $groups_join = undef;
1856: my $group_limits = undef;
1857: if ( (defined($Groups) && $Groups->[0] ne 'all')) {
1858: $groups_join =
1859: ' LEFT JOIN '.$students_groups_table.
1860: ' AS '.$stugrptab.' ON '.
1861: $stugrptab.'.student_id = '.$stutable.'.student_id'.
1862: ' LEFT JOIN '.$groupnames_table.
1863: ' AS '.$grptable.' ON '.
1864: $stugrptab.'.group_id = '.$grptable.'.group_id ';
1865: $group_limits =
1866: ' ('.
1867: join(' OR ', map { "$grptable.groupname='".$_."'" } @$Groups
1868: ).')';
1869: }
1870: return ($groups_join,$group_limits);
1871: }
1872:
1873:
1874: sub RNK_student { return 0; };
1875: sub RNK_score { return 1; };
1876:
1877: sub rank_students_by_scores_on_resources {
1878: my ($resources,$Sections,$Groups,$enrollment,$courseid,$starttime,$endtime,
1879: $has_award_for) = @_;
1880: return if (! defined($resources) || ! ref($resources) eq 'ARRAY');
1881: if (! defined($courseid)) {
1882: $courseid = $env{'request.course.id'};
1883: }
1884: #
1885: &setup_table_names($courseid);
1886: my $dbh = &Apache::lonmysql::get_dbh();
1887: my ($section_limits,$enrollment_limits)=
1888: &limit_by_section_and_status($Sections,$enrollment,'b');
1889: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
1890: my $symb_limits = '('.join(' OR ',map {'a.symb_id='.&get_symb_id($_);
1891: } @$resources
1892: ).')';
1893: my ($award_col, $award_join, $award_clause) = ('', '', '');
1894: if ($has_award_for) {
1895: my $resource_id = &get_symb_id($has_award_for);
1896: $award_col = ", perf.awarded";
1897: $award_join = "LEFT JOIN $performance_table AS perf ON perf.symb_id"
1898: ." = $resource_id AND perf.student_id = b.student_id ";
1899: $award_clause = "AND perf.awarded IS NOT NULL";
1900: }
1901: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
1902: my $request = "SELECT b.student,SUM(a.awarded*w.weight) AS score "
1903: ."$award_col FROM $performance_table AS a ".
1904: "NATURAL LEFT JOIN $weight_table AS w ".
1905: "LEFT JOIN $student_table AS b ON a.student_id=b.student_id ".
1906: "$award_join $groups_join ";
1907: my $limits;
1908: if (defined($section_limits)) {
1909: $limits .= $section_limits.' AND ';
1910: }
1911: if (defined($enrollment_limits)) {
1912: $limits .= $enrollment_limits.' AND ';
1913: }
1914: if (defined($time_limits)) {
1915: $limits .= $time_limits.' AND ';
1916: }
1917: if ($symb_limits ne '()') {
1918: $limits .= $symb_limits.' AND ';
1919: }
1920: if (defined($group_limits)) {
1921: $limits .= $group_limits.' AND ';
1922: }
1923: if ($limits) {
1924: $limits =~ s/( AND )$//; # Remove extra conjunction
1925: $request .= "WHERE $limits";
1926: }
1927: $request .= " $award_clause GROUP BY a.student_id ORDER BY score, b.student";
1928: #&Apache::lonnet::logthis('request = '.$/.$request);
1929: my $sth = $dbh->prepare($request) or die "Can't prepare $request";
1930: $sth->execute();
1931: my $rows = $sth->fetchall_arrayref();
1932: return ($rows);
1933: }
1934:
1935: sub get_sum_of_scores {
1936: my ($symb,$part,$students,$courseid,$starttime,$endtime) = @_;
1937: if (! defined($courseid)) {
1938: $courseid = $env{'request.course.id'};
1939: }
1940: if (defined($students) &&
1941: ((@$students == 0) ||
1942: (@$students == 1 && (! defined($students->[0]) ||
1943: $students->[0] eq ''))
1944: )
1945: ){
1946: undef($students);
1947: }
1948: #
1949: &setup_table_names($courseid);
1950: my $dbh = &Apache::lonmysql::get_dbh();
1951: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
1952: my $request = 'SELECT SUM(a.awarded*w.weight),SUM(w.weight) FROM '.
1953: $performance_table.' AS a '.
1954: 'NATURAL LEFT JOIN '.$weight_table.' AS w ';
1955: $request .= 'WHERE a.symb_id='.&get_symb_id($symb).
1956: ' AND a.part_id='.&get_part_id($part);
1957: if (defined($time_limits)) {
1958: $request .= ' AND '.$time_limits;
1959: }
1960: if (defined($students)) {
1961: $request .= ' AND ('.
1962: join(' OR ',map {'a.student_id='.&get_student_id(split(':',$_));
1963: } @$students).
1964: ')';
1965: }
1966: my $sth = $dbh->prepare($request);
1967: $sth->execute();
1968: my $rows = $sth->fetchrow_arrayref();
1969: if ($dbh->err) {
1970: &Apache::lonnet::logthis('error 1 = '.$dbh->errstr());
1971: &Apache::lonnet::logthis('prepared then executed, fetchrow_arrayrefed'.
1972: $/.$request);
1973: return (undef,undef);
1974: }
1975: return ($rows->[0],$rows->[1]);
1976: }
1977:
1978:
1979: sub score_stats {
1980: my ($Sections,$Groups,$enrollment,$symbs,$starttime,$endtime,$courseid)=@_;
1981: if (! defined($courseid)) {
1982: $courseid = $env{'request.course.id'};
1983: }
1984: #
1985: &setup_table_names($courseid);
1986: my $dbh = &Apache::lonmysql::get_dbh();
1987: #
1988: my ($section_limits,$enrollment_limits)=
1989: &limit_by_section_and_status($Sections,$enrollment,'b');
1990: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
1991: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
1992: my @Symbids = map { &get_symb_id($_); } @{$symbs};
1993: #
1994: my $stats_table = &temp_table_name($courseid,'problem_stats');
1995: my $symb_restriction = join(' OR ',map {'a.symb_id='.$_;} @Symbids);
1996: my $request = 'DROP TABLE '.$stats_table;
1997: $dbh->do($request);
1998: $request =
1999: 'CREATE TEMPORARY TABLE '.$stats_table.' '.
2000: 'SELECT a.student_id,'.
2001: 'SUM(a.awarded*w.weight) AS score FROM '.
2002: $performance_table.' AS a '.
2003: 'NATURAL LEFT JOIN '.$weight_table.' AS w '.
2004: 'LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id '.
2005: $groups_join;
2006: my $limit = ' WHERE ('.$symb_restriction.')';
2007: if ($time_limits) {
2008: $limit .= ' AND '.$time_limits;
2009: }
2010: if ($section_limits) {
2011: $limit .= ' AND '.$section_limits;
2012: }
2013: if ($enrollment_limits) {
2014: $limit .= ' AND '.$enrollment_limits;
2015: }
2016: if ($group_limits) {
2017: $limit .= ' AND '.$group_limits;
2018: }
2019: $request .= $limit.' GROUP BY a.student_id';
2020: # &Apache::lonnet::logthis('request = '.$/.$request);
2021: my $sth = $dbh->prepare($request);
2022: $sth->execute();
2023: $request =
2024: 'SELECT AVG(score),STD(score),MAX(score),MIN(score),COUNT(score) '.
2025: 'FROM '.$stats_table;
2026: my ($ave,$std,$max,$min,$count) = &execute_SQL_request($dbh,$request);
2027: # &Apache::lonnet::logthis('request = '.$/.$request);
2028:
2029: $request = 'SELECT SUM(weight) FROM '.$weight_table.
2030: ' AS a WHERE ('.$symb_restriction.')';
2031: my ($max_possible) = &execute_SQL_request($dbh,$request);
2032: # &Apache::lonnet::logthis('request = '.$/.$request);
2033: return($min,$max,$ave,$std,$count,$max_possible);
2034: }
2035:
2036:
2037:
2038: sub count_stats {
2039: my ($Sections,$Groups,$enrollment,$symbs,$starttime,$endtime,$courseid)=@_;
2040: if (! defined($courseid)) {
2041: $courseid = $env{'request.course.id'};
2042: }
2043: #
2044: &setup_table_names($courseid);
2045: my $dbh = &Apache::lonmysql::get_dbh();
2046: #
2047: my ($section_limits,$enrollment_limits)=
2048: &limit_by_section_and_status($Sections,$enrollment,'b');
2049: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
2050: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
2051: my @Symbids = map { &get_symb_id($_); } @{$symbs};
2052: #
2053: my $stats_table = &temp_table_name($courseid,'problem_stats');
2054: my $symb_restriction = join(' OR ',map {'a.symb_id='.$_;} @Symbids);
2055: my $request = 'DROP TABLE '.$stats_table;
2056: $dbh->do($request);
2057: $request =
2058: 'CREATE TEMPORARY TABLE '.$stats_table.' '.
2059: 'SELECT a.student_id,'.
2060: 'SUM(a.awarded) AS count FROM '.
2061: $performance_table.' AS a '.
2062: 'LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id '.
2063: $groups_join;
2064: my $limit = ' WHERE ('.$symb_restriction.')';
2065: if ($time_limits) {
2066: $limit .= ' AND '.$time_limits;
2067: }
2068: if ($section_limits) {
2069: $limit .= ' AND '.$section_limits;
2070: }
2071: if ($enrollment_limits) {
2072: $limit .= ' AND '.$enrollment_limits;
2073: }
2074: if ($group_limits) {
2075: $limit .= ' AND '.$group_limits;
2076: }
2077: $request .= $limit.' GROUP BY a.student_id';
2078: # &Apache::lonnet::logthis('request = '.$/.$request);
2079: my $sth = $dbh->prepare($request);
2080: $sth->execute();
2081: $request =
2082: 'SELECT AVG(count),STD(count),MAX(count),MIN(count),COUNT(count) '.
2083: 'FROM '.$stats_table;
2084: my ($ave,$std,$max,$min,$count) = &execute_SQL_request($dbh,$request);
2085: # &Apache::lonnet::logthis('request = '.$/.$request);
2086: return($min,$max,$ave,$std,$count);
2087: }
2088:
2089:
2090: sub get_student_data {
2091: my ($students,$courseid) = @_;
2092: $courseid = $env{'request.course.id'} if (! defined($courseid));
2093: &setup_table_names($courseid);
2094: my $dbh = &Apache::lonmysql::get_dbh();
2095: return undef if (! defined($dbh));
2096: my $request = 'SELECT '.
2097: 'student_id, student '.
2098: 'FROM '.$student_table;
2099: if (defined($students)) {
2100: $request .= ' WHERE ('.
2101: join(' OR ', map {'student_id='.
2102: &get_student_id($_->{'username'},
2103: $_->{'domain'})
2104: } @$students
2105: ).')';
2106: }
2107: $request.= ' ORDER BY student_id';
2108: my $sth = $dbh->prepare($request);
2109: $sth->execute();
2110: if ($dbh->err) {
2111: &Apache::lonnet::logthis('error 2 = '.$dbh->errstr());
2112: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2113: return undef;
2114: }
2115: my $dataset = $sth->fetchall_arrayref();
2116: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2117: return $dataset;
2118: }
2119: }
2120:
2121: sub RD_student_id { return 0; }
2122: sub RD_awarddetail { return 1; }
2123: sub RD_response_eval { return 2; }
2124: sub RD_response_eval_2 { return 3; }
2125: sub RD_submission { return 4; }
2126: sub RD_timestamp { return 5; }
2127: sub RD_tries { return 6; }
2128: sub RD_sname { return 7; }
2129:
2130: sub get_response_data {
2131: my ($Sections,$Groups,$enrollment,$symb,$response,$courseid) = @_;
2132: return undef if (! defined($symb) ||
2133: ! defined($response));
2134: $courseid = $env{'request.course.id'} if (! defined($courseid));
2135: #
2136: &setup_table_names($courseid);
2137: my $symb_id = &get_symb_id($symb);
2138: if (! defined($symb_id)) {
2139: &Apache::lonnet::logthis('Unable to find symb for '.$symb.' in '.$courseid);
2140: return undef;
2141: }
2142: my $response_id = &get_part_id($response);
2143: if (! defined($response_id)) {
2144: &Apache::lonnet::logthis('Unable to find id for '.$response.' in '.$courseid);
2145: return undef;
2146: }
2147: #
2148: my $dbh = &Apache::lonmysql::get_dbh();
2149: return undef if (! defined($dbh));
2150: #
2151: my ($student_requirements,$enrollment_requirements) =
2152: &limit_by_section_and_status($Sections,$enrollment,'d');
2153: my ($groups_join,$group_limits) = &limit_by_group($Groups,'d','e','f');
2154: my $request = 'SELECT '.
2155: 'a.student_id, a.awarddetail, a.response_specific_value, '.
2156: 'a.response_specific_value_2, a.submission, b.timestamp, '.
2157: 'c.tries, d.student '.
2158: 'FROM '.$fulldump_response_table.' AS a '.
2159: 'LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
2160: 'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
2161: 'a.transaction = b.transaction '.
2162: 'LEFT JOIN '.$fulldump_part_table.' AS c '.
2163: 'ON a.symb_id=c.symb_id AND a.student_id=c.student_id AND '.
2164: 'a.part_id=c.part_id AND a.transaction = c.transaction '.
2165: 'LEFT JOIN '.$student_table.' AS d '.
2166: 'ON a.student_id=d.student_id '.
2167: $groups_join;
2168: my $limit = ' WHERE '.
2169: 'a.symb_id='.$symb_id.' AND a.response_id='.$response_id;
2170: if (defined($student_requirements)) {
2171: $limit .= ' AND '.$student_requirements;
2172: }
2173: if (defined($enrollment_requirements)) {
2174: $limit .= ' AND '.$enrollment_requirements;
2175: }
2176: if (defined($group_limits)) {
2177: $limit .= ' AND '.$group_limits;
2178: }
2179: $request .= $limit.' ORDER BY b.timestamp';
2180: # &Apache::lonnet::logthis("request =\n".$request);
2181: my $sth = $dbh->prepare($request);
2182: $sth->execute();
2183: if ($dbh->err) {
2184: &Apache::lonnet::logthis('error 3 = '.$dbh->errstr());
2185: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2186: return undef;
2187: }
2188: my $dataset = $sth->fetchall_arrayref();
2189: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2190: # Clear the \'s from around the submission
2191: for (my $i =0;$i<scalar(@$dataset);$i++) {
2192: $dataset->[$i]->[&RD_submission()] =~ s/(\'$|^\')//g;
2193: }
2194: return $dataset;
2195: }
2196: }
2197:
2198:
2199: sub RDs_awarddetail { return 3; }
2200: sub RDs_submission { return 2; }
2201: sub RDs_timestamp { return 1; }
2202: sub RDs_tries { return 0; }
2203: sub RDs_awarded { return 4; }
2204: sub RDs_response_eval { return 5; }
2205: sub RDs_response_eval_2 { return 6; }
2206: sub RDs_part_award { return 7; }
2207:
2208: sub get_response_data_by_student {
2209: my ($student,$symb,$response,$courseid) = @_;
2210: return undef if (! defined($symb) ||
2211: ! defined($response));
2212: $courseid = $env{'request.course.id'} if (! defined($courseid));
2213: #
2214: &setup_table_names($courseid);
2215: my $symb_id = &get_symb_id($symb);
2216: my $response_id = &get_part_id($response);
2217: #
2218: my $student_id = &get_student_id($student->{'username'},
2219: $student->{'domain'});
2220: #
2221: my $dbh = &Apache::lonmysql::get_dbh();
2222: return undef if (! defined($dbh));
2223: my $request = 'SELECT '.
2224: 'c.tries, b.timestamp, a.submission, a.awarddetail, c.awarded, '.
2225: 'a.response_specific_value, a.response_specific_value_2, c.award '.
2226: 'FROM '.$fulldump_response_table.' AS a '.
2227: 'LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
2228: 'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
2229: 'a.transaction = b.transaction '.
2230: 'LEFT JOIN '.$fulldump_part_table.' AS c '.
2231: 'ON a.symb_id=c.symb_id AND a.student_id=c.student_id AND '.
2232: 'a.part_id=c.part_id AND a.transaction = c.transaction '.
2233: 'LEFT JOIN '.$student_table.' AS d '.
2234: 'ON a.student_id=d.student_id '.
2235: 'LEFT JOIN '.$performance_table.' AS e '.
2236: 'ON a.symb_id=e.symb_id AND a.part_id=e.part_id AND '.
2237: 'a.student_id=e.student_id AND c.tries=e.tries '.
2238: 'WHERE '.
2239: 'a.symb_id='.$symb_id.' AND a.response_id='.$response_id.
2240: ' AND a.student_id='.$student_id.' ORDER BY b.timestamp';
2241: # &Apache::lonnet::logthis("request =\n".$request);
2242: my $sth = $dbh->prepare($request);
2243: $sth->execute();
2244: if ($dbh->err) {
2245: &Apache::lonnet::logthis('error 4 = '.$dbh->errstr());
2246: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2247: return undef;
2248: }
2249: my $dataset = $sth->fetchall_arrayref();
2250: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2251: # Clear the \'s from around the submission
2252: for (my $i =0;$i<scalar(@$dataset);$i++) {
2253: $dataset->[$i]->[&RDs_submission] =~ s/(\'$|^\')//g;
2254: }
2255: return $dataset;
2256: }
2257: return undef; # error occurred
2258: }
2259:
2260: sub RT_student_id { return 0; }
2261: sub RT_awarded { return 1; }
2262: sub RT_tries { return 2; }
2263: sub RT_timestamp { return 3; }
2264:
2265: sub get_response_time_data {
2266: my ($sections,$groups,$enrollment,$symb,$part,$courseid) = @_;
2267: return undef if (! defined($symb) ||
2268: ! defined($part));
2269: $courseid = $env{'request.course.id'} if (! defined($courseid));
2270: #
2271: &setup_table_names($courseid);
2272: my $symb_id = &get_symb_id($symb);
2273: if (! defined($symb_id)) {
2274: &Apache::lonnet::logthis('Unable to find symb for '.$symb.' in '.$courseid);
2275: return undef;
2276: }
2277: my $part_id = &get_part_id($part);
2278: if (! defined($part_id)) {
2279: &Apache::lonnet::logthis('Unable to find id for '.$part.' in '.$courseid);
2280: return undef;
2281: }
2282: #
2283: my $dbh = &Apache::lonmysql::get_dbh();
2284: return undef if (! defined($dbh));
2285: my ($student_requirements,$enrollment_requirements) =
2286: &limit_by_section_and_status($sections,$enrollment,'d');
2287: my ($groups_join,$group_limits) = &limit_by_group($groups,'d','e','f');
2288: my $request = 'SELECT '.
2289: 'a.student_id, a.awarded, a.tries, b.timestamp '.
2290: 'FROM '.$fulldump_part_table.' AS a '.
2291: 'LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
2292: 'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
2293: 'a.transaction = b.transaction '.
2294: 'LEFT JOIN '.$student_table.' as d '.
2295: 'ON a.student_id=d.student_id '.
2296: $groups_join;
2297: my $limit = ' WHERE '.
2298: 'a.symb_id='.$symb_id.' AND a.part_id='.$part_id;
2299: if (defined($student_requirements)) {
2300: $limit .= ' AND '.$student_requirements;
2301: }
2302: if (defined($enrollment_requirements)) {
2303: $limit .= ' AND '.$enrollment_requirements;
2304: }
2305: if (defined($group_limits)) {
2306: $limit .= ' AND '.$group_limits;
2307: }
2308: $request .= $limit.' ORDER BY b.timestamp';
2309: # &Apache::lonnet::logthis("request =\n".$request);
2310: my $sth = $dbh->prepare($request);
2311: $sth->execute();
2312: if ($dbh->err) {
2313: &Apache::lonnet::logthis('error 5 = '.$dbh->errstr());
2314: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2315: return undef;
2316: }
2317: my $dataset = $sth->fetchall_arrayref();
2318: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2319: return $dataset;
2320: }
2321:
2322: }
2323:
2324: sub get_student_scores {
2325: my ($sections,$groups,$Symbs,$enrollment,$courseid,$starttime,$endtime) = @_;
2326: $courseid = $env{'request.course.id'} if (! defined($courseid));
2327: &setup_table_names($courseid);
2328: my $dbh = &Apache::lonmysql::get_dbh();
2329: return (undef) if (! defined($dbh));
2330: my $tmptable = &temp_table_name($courseid,'temp_'.time);
2331: my $request = 'DROP TABLE IF EXISTS '.$tmptable;
2332: # &Apache::lonnet::logthis('request = '.$/.$request);
2333: $dbh->do($request);
2334: #
2335: my $symb_requirements;
2336: if (defined($Symbs) && @$Symbs) {
2337: $symb_requirements = '('.
2338: join(' OR ', map{ "(a.symb_id='".&get_symb_id($_->{'symb'}).
2339: "' AND a.part_id='".&get_part_id($_->{'part'}).
2340: "')"
2341: } @$Symbs).')';
2342: }
2343: #
2344: my ($student_requirements,$enrollment_requirements) =
2345: &limit_by_section_and_status($sections,$enrollment,'b');
2346: #
2347: my ($groups_join,$group_limits) = &limit_by_group($groups,'b','d','e');
2348: my $time_requirements = &limit_by_start_end_time($starttime,$endtime,'a');
2349: ##
2350: $request = 'CREATE TEMPORARY TABLE IF NOT EXISTS '.$tmptable.
2351: ' SELECT a.student_id,SUM(a.awarded*c.weight) AS score FROM '.
2352: $performance_table.' AS a ';
2353: $request .= "LEFT JOIN ".$weight_table.' AS c ON a.symb_id=c.symb_id AND a.part_id=c.part_id ';
2354: if (defined($student_requirements) || defined($enrollment_requirements)) {
2355: $request .= ' LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id ';
2356: }
2357: if (defined($groups_join)) {
2358: $request .= $groups_join;
2359: }
2360: if (defined($symb_requirements) ||
2361: defined($student_requirements) ||
2362: defined($enrollment_requirements) ||
2363: defined($group_limits) ) {
2364: $request .= ' WHERE ';
2365: }
2366: if (defined($symb_requirements)) {
2367: $request .= $symb_requirements.' AND ';
2368: }
2369: if (defined($student_requirements)) {
2370: $request .= $student_requirements.' AND ';
2371: }
2372: if (defined($enrollment_requirements)) {
2373: $request .= $enrollment_requirements.' AND ';
2374: }
2375: if (defined($time_requirements)) {
2376: $request .= $time_requirements.' AND ';
2377: }
2378: $request =~ s/ AND $//; # Strip of the trailing ' AND '.
2379: $request .= ' GROUP BY a.student_id';
2380: # &Apache::lonnet::logthis("request = \n".$request);
2381: my $sth = $dbh->prepare($request);
2382: $sth->execute();
2383: if ($dbh->err) {
2384: &Apache::lonnet::logthis('error 6 = '.$dbh->errstr());
2385: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2386: return undef;
2387: }
2388: $request = 'SELECT score,COUNT(*) FROM '.$tmptable.' GROUP BY score';
2389: # &Apache::lonnet::logthis("request = \n".$request);
2390: $sth = $dbh->prepare($request);
2391: $sth->execute();
2392: if ($dbh->err) {
2393: &Apache::lonnet::logthis('error 7 = '.$dbh->errstr());
2394: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2395: return undef;
2396: }
2397: my $dataset = $sth->fetchall_arrayref();
2398: return $dataset;
2399: }
2400:
2401:
2402:
2403: sub setup_table_names {
2404: my ($courseid) = @_;
2405: if (! defined($courseid)) {
2406: $courseid = $env{'request.course.id'};
2407: }
2408: #
2409: if (! defined($current_course) || $current_course ne $courseid) {
2410: # Clear out variables
2411: $have_read_part_table = 0;
2412: undef(%ids_by_part);
2413: undef(%parts_by_id);
2414: $have_read_symb_table = 0;
2415: undef(%ids_by_symb);
2416: undef(%symbs_by_id);
2417: $have_read_student_table = 0;
2418: undef(%ids_by_student);
2419: undef(%students_by_id);
2420: $have_read_groupnames_table = 0;
2421: undef(%ids_by_groupname);
2422: #
2423: $current_course = $courseid;
2424: }
2425: #
2426: # Set up database names
2427: my $base_id = 'md5_'.&Digest::MD5::md5_hex($courseid);
2428: $symb_table = $base_id.'_'.'symb';
2429: $part_table = $base_id.'_'.'part';
2430: $student_table = $base_id.'_'.'student';
2431: $groupnames_table = $base_id.'_'.'groupnames';
2432: $students_groups_table = $base_id.'_'.'studentgroups';
2433: $performance_table = $base_id.'_'.'performance';
2434: $parameters_table = $base_id.'_'.'parameters';
2435: $fulldump_part_table = $base_id.'_'.'partdata';
2436: $fulldump_response_table = $base_id.'_'.'responsedata';
2437: $fulldump_timestamp_table = $base_id.'_'.'timestampdata';
2438: $weight_table = $base_id.'_'.'weight';
2439: #
2440: @Tables = (
2441: $symb_table,
2442: $part_table,
2443: $student_table,
2444: $groupnames_table,
2445: $students_groups_table,
2446: $performance_table,
2447: $parameters_table,
2448: $fulldump_part_table,
2449: $fulldump_response_table,
2450: $fulldump_timestamp_table,
2451: $weight_table,
2452: );
2453: return;
2454: }
2455:
2456: sub temp_table_name {
2457: my ($courseid,$affix) = @_;
2458: my $base_id = 'md5_'.&Digest::MD5::md5_hex($courseid);
2459: return $base_id.'_'.$affix;
2460: }
2461:
2462:
2463: } # End scope of table identifiers
2464:
2465:
2466:
2467: sub CL_SDOM { return 0; }
2468: sub CL_SNAME { return 1; }
2469: sub CL_END { return 2; }
2470: sub CL_START { return 3; }
2471: sub CL_ID { return 4; }
2472: sub CL_SECTION { return 5; }
2473: sub CL_FULLNAME { return 6; }
2474: sub CL_STATUS { return 7; }
2475: sub CL_TYPE { return 8; }
2476: sub CL_LOCKEDTYPE { return 9; }
2477: sub CL_CREDITS { return 10; }
2478: sub CL_INSTSEC { return 11; }
2479: sub CL_GROUP { return 12; }
2480: sub CL_PERMANENTEMAIL { return 13; }
2481: sub CL_ROLE { return 14; }
2482: sub CL_EXTENT { return 15; }
2483: sub CL_PHOTO { return 16; }
2484: sub CL_THUMBNAIL { return 17; }
2485: sub CL_AUTHORQUOTA { return 18; }
2486: sub CL_AUTHORUSAGE { return 19; }
2487:
2488: sub get_classlist {
2489: my ($cdom,$cnum) = @_;
2490: my $cid = $cdom.'_'.$cnum;
2491: if (!defined($cdom) || !defined($cnum)) {
2492: $cid = $env{'request.course.id'};
2493: $cdom = $env{'course.'.$cid.'.domain'};
2494: $cnum = $env{'course.'.$cid.'.num'};
2495: }
2496: my $now = time;
2497: #
2498: my %classlist=&Apache::lonnet::dump('classlist',$cdom,$cnum);
2499: while (my ($student,$info) = each(%classlist)) {
2500: if ($student =~ /^(con_lost|error|no_such_host)/i) {
2501: &Apache::lonnet::logthis('get_classlist error for '.$cid.':'.$student);
2502: return undef;
2503: }
2504: my ($sname,$sdom) = split(/:/,$student);
2505: my @Values = split(/:/,$info);
2506: my ($end,$start,$id,$section,$fullname,$type,$lockedtype,$credits,$instsec);
2507: if (@Values > 2) {
2508: ($end,$start,$id,$section,$fullname,$type,$lockedtype,$credits,$instsec) = @Values;
2509: } else { # We have to get the data ourselves
2510: ($end,$start) = @Values;
2511: $section = &Apache::lonnet::getsection($sdom,$sname,$cid);
2512: my %info=&Apache::lonnet::get('environment',
2513: ['firstname','middlename',
2514: 'lastname','generation','id'],
2515: $sdom, $sname);
2516: my ($tmp) = keys(%info);
2517: if ($tmp =~/^(con_lost|error|no_such_host)/i) {
2518: $fullname = 'not available';
2519: $id = 'not available';
2520: &Apache::lonnet::logthis('unable to retrieve environment '.
2521: 'for '.$sname.':'.$sdom);
2522: } else {
2523: $fullname = &Apache::lonnet::format_name(@info{qw/firstname middlename lastname generation/},'lastname');
2524: $id = $info{'id'};
2525: }
2526: # Update the classlist with this students information
2527: if ($fullname ne 'not available') {
2528: my $enrolldata = join(':',$end,$start,$id,$section,$fullname);
2529: my $reply=&Apache::lonnet::cput('classlist',
2530: {$student => $enrolldata},
2531: $cdom,$cnum);
2532: if ($reply !~ /^(ok|delayed)/) {
2533: &Apache::lonnet::logthis('Unable to update classlist for '.
2534: 'student '.$sname.':'.$sdom.
2535: ' error:'.$reply);
2536: }
2537: }
2538: }
2539: my $status='Expired';
2540: if(((!$end) || $now < $end) && ((!$start) || ($now > $start))) {
2541: $status='Active';
2542: }
2543: if(($now < $start) && ((!$end) || $now < $end )) {
2544: $status='Future';
2545: }
2546: $classlist{$student} =
2547: [$sdom,$sname,$end,$start,$id,$section,$fullname,$status,$type,
2548: $lockedtype,$credits,$instsec];
2549: }
2550: if (wantarray()) {
2551: return (\%classlist,['domain','username','end','start','id',
2552: 'section','fullname','status','type',
2553: 'lockedtype','credits','instsec']);
2554: } else {
2555: return \%classlist;
2556: }
2557: }
2558:
2559: sub get_group_memberships {
2560: my ($classlist,$keylist,$cdom,$cnum) = @_;
2561:
2562: return ({},{}) if (!ref($classlist) || !ref($keylist));
2563:
2564: my $cid = $cdom.'_'.$cnum;
2565: if (!defined($cdom) || !defined($cnum)) {
2566: $cid = $env{'request.course.id'};
2567: $cdom = $env{'course.'.$cid.'.domain'};
2568: $cnum = $env{'course.'.$cid.'.num'};
2569: }
2570: my (%classgroups,%studentgroups);
2571: my $now = time;
2572: my $access_end = $env{'course.'.$cid.'.default_enrollment_end_date'};
2573: my %curr_groups =&Apache::longroup::coursegroups($cdom,$cnum);
2574: if (%curr_groups) {
2575: my $grpindex = &CL_GROUP();
2576: my %groupmemberhash =
2577: &Apache::lonnet::get_group_membership($cdom,$cnum);
2578: foreach my $student (keys(%{$classlist})) {
2579: %{$classgroups{$student}} = ();
2580: my $hasgroup = 0;
2581: foreach my $status ('previous','future','active','aftercourse') {
2582: %{$classgroups{$student}{$status}} = ();
2583: }
2584: foreach my $group (keys(%curr_groups)) {
2585: if (defined($groupmemberhash{$group.':'.$student})) {
2586: my ($end,$start) = split(/:/,$groupmemberhash{$group.':'.
2587: $student});
2588: if ($start == -1) {
2589: next;
2590: } else {
2591: $studentgroups{$group} ++;
2592: $hasgroup = 1;
2593: if ($end && $end < $now) {
2594: $classgroups{$student}{'previous'}{$group} =
2595: $groupmemberhash{$group.':'.$student};
2596: if ($classlist->{$student}[&CL_STATUS()] eq 'Expired') {
2597: if ($access_end && $access_end < $now) {
2598: if ($access_end - $end < 86400) {
2599: $classgroups{$student}{'aftercourse'}{$group} = $groupmemberhash{$group.':'.$student};
2600: }
2601: }
2602: }
2603: } elsif ($now > $start) {
2604: if (!$end || $end > $now) {
2605: $classgroups{$student}{'active'}{$group} =
2606: $groupmemberhash{$group.':'.$student};
2607: }
2608: } else {
2609: $classgroups{$student}{'future'}{$group} =
2610: $groupmemberhash{$group.':'.$student};
2611: }
2612: }
2613: }
2614: }
2615: if (!$hasgroup) {
2616: $studentgroups{'none'} ++;
2617: } else {
2618: $classlist->{$student}->[$grpindex] = join(',',
2619: sort(keys(%{$classgroups{$student}{'active'}})));
2620: }
2621: }
2622: }
2623: return (\%classgroups,\%studentgroups);
2624: }
2625:
2626: sub get_students_groups {
2627: my ($student,$enrollment_status,$classgroups) = @_;
2628: my @studentsgroups = ();
2629: if (ref($$classgroups{$student}{'active'}) eq 'HASH') {
2630: push(@studentsgroups,keys(%{$$classgroups{$student}{'active'}}));
2631: }
2632: if ($enrollment_status eq 'Any') {
2633: foreach my $status ('previous','future') {
2634: if (ref($$classgroups{$student}{$status}) eq 'HASH') {
2635: push(@studentsgroups,keys(%{$$classgroups{$student}{$status}}));
2636: }
2637: }
2638: } else {
2639: if (ref($$classgroups{$student}{'aftercourse'}) eq 'HASH') {
2640: push(@studentsgroups,keys(%{$$classgroups{$student}{'aftercourse'}}));
2641: }
2642: }
2643: return @studentsgroups;
2644: }
2645:
2646:
2647: # ----- END HELPER FUNCTIONS --------------------------------------------
2648:
2649: 1;
2650: __END__
2651:
2652:
2653: =pod
2654:
2655: =head1 NAME
2656:
2657: Apache::loncoursedata
2658:
2659: =head1 SYNOPSIS
2660:
2661: Set of functions that download and process student and course information.
2662:
2663: =head1 PACKAGES USED
2664:
2665: Apache::lonnet
2666: Apache::longroup
2667: Time::HiRes
2668: Apache::lonmysql
2669: LONCAPA
2670: Digest::MD5
2671:
2672: =head1 DOWNLOAD INFORMATION
2673:
2674: This section contains all the functions that get data from other servers
2675: and/or itself.
2676:
2677:
2678:
2679: =head1 LOCAL DATA CACHING SUBROUTINES
2680:
2681: The local caching is done using MySQL. There is no fall-back implementation
2682: if MySQL is not running.
2683:
2684: The programmers interface is to call &get_current_state() or some other
2685: primary interface subroutine (described below). The internals of this
2686: storage system are documented here.
2687:
2688: There are six tables used to store student performance data (the results of
2689: a dumpcurrent). Each of these tables is created in MySQL with a name of
2690: $courseid_*****, where ***** is 'symb', 'part', or whatever is appropriate
2691: for the table. The tables and their purposes are described below.
2692:
2693: Some notes before we get started.
2694:
2695: Each table must have a PRIMARY KEY, which is a column or set of columns which
2696: will serve to uniquely identify a row of data. NULL is not allowed!
2697:
2698: INDEXes work best on integer data.
2699:
2700: JOIN is used to combine data from many tables into one output.
2701:
2702: lonmysql.pm is used for some of the interface, specifically the table creation
2703: calls. The inserts are done in bulk by directly calling the database handler.
2704: The SELECT ... JOIN statement used to retrieve the data does not have an
2705: interface in lonmysql.pm and I shudder at the thought of writing one.
2706:
2707: =head2 Table Descriptions
2708:
2709: =over 4
2710:
2711: =head2 Tables used to store meta information
2712:
2713: The following tables hold data required to keep track of the current status
2714: of a students data in the tables or to look up the students data in the tables.
2715:
2716: =over 4
2717:
2718: =item C<$symb_table>
2719:
2720: The symb_table has two columns. The first is a 'symb_id' and the second
2721: is the text name for the 'symb' (limited to 64k). The 'symb_id' is generated
2722: automatically by MySQL so inserts should be done on this table with an
2723: empty first element. This table has its PRIMARY KEY on the 'symb_id'.
2724:
2725: =item C<$part_table>
2726:
2727: The part_table has two columns. The first is a 'part_id' and the second
2728: is the text name for the 'part' (limited to 100 characters). The 'part_id' is
2729: generated automatically by MySQL so inserts should be done on this table with
2730: an empty first element. This table has its PRIMARY KEY on the 'part' (100
2731: characters) and a KEY on 'part_id'.
2732:
2733: =item C<$student_table>
2734:
2735: The student_table has 7 columns. The first is a 'student_id' assigned by
2736: MySQL. The second is 'student' which is username:domain. The third through
2737: fifth are 'section', 'status' (enrollment status), and 'classification'
2738: (to be used in the future). The sixth and seventh ('updatetime' and
2739: 'fullupdatetime') contain the time of last update and full update of student
2740: data. This table has its PRIMARY KEY on the 'student_id' column and is indexed
2741: on 'student', 'section', and 'status'.
2742:
2743: =item C<$groupnames_table>
2744:
2745: The groupnames_table has 2 columns. The first is a 'group_id' assigned by
2746: MySQL. The second is 'groupname' which is the name of the group in the course.
2747:
2748: =item C<$students_groups_table>
2749:
2750: The students_groups_table has 2 columns. The first is the 'student_id', and the
2751: second is the 'group_id'. These two columns comprise the PRIMARY KEY for this
2752: table, as an individual student may be affiliated with more than one group at
2753: any time. This table is indexed on both student_id and group_id.
2754:
2755: =back
2756:
2757: =head2 Tables used to store current status data
2758:
2759: The following tables store data only about the students current status on
2760: a problem, meaning only the data related to the last attempt on a problem.
2761:
2762: =over 4
2763:
2764: =item C<$performance_table>
2765:
2766: The performance_table has 9 columns. The first three are 'symb_id',
2767: 'student_id', and 'part_id'. These comprise the PRIMARY KEY for this table
2768: and are directly related to the $symb_table, $student_table, and $part_table
2769: described above. MySQL does better indexing on numeric items than text,
2770: so we use these three "index tables". The remaining columns are
2771: 'solved', 'tries', 'awarded', 'award', 'awarddetail', and 'timestamp'.
2772: These are either the MySQL type TINYTEXT or various integers ('tries' and
2773: 'timestamp'). This table has KEYs of 'student_id' and 'symb_id'.
2774: For use of this table, see the functions described below.
2775:
2776: =item C<$parameters_table>
2777:
2778: The parameters_table holds the data that does not fit neatly into the
2779: performance_table. The parameters table has four columns: 'symb_id',
2780: 'student_id', 'parameter', and 'value'. 'symb_id', 'student_id', and
2781: 'parameter' comprise the PRIMARY KEY for this table. 'parameter' is
2782: limited to 255 characters. 'value' is limited to 64k characters.
2783:
2784: =back
2785:
2786: =head2 Tables used for storing historic data
2787:
2788: The following tables are used to store almost all of the transactions a student
2789: has made on a homework problem. See loncapa/docs/homework/datastorage for
2790: specific information about each of the parameters stored.
2791:
2792: =over 4
2793:
2794: =item C<$fulldump_response_table>
2795:
2796: The response table holds data (documented in loncapa/docs/homework/datastorage)
2797: associated with a particular response id which is stored when a student
2798: attempts a problem. The following are the columns of the table, in order:
2799: 'symb_id','part_id','response_id','student_id','transaction','tries',
2800: 'awarddetail', 'response_specific', 'response_specific_value',
2801: 'response_specific_2', 'response_specific_value_2', and 'submission
2802: (the text of the students submission). The primary key is based on the
2803: first five columns listed above.
2804:
2805: =item C<$fulldump_part_table()>
2806:
2807: The part table holds data (documented in loncapa/docs/homework/datastorage)
2808: associated with a particular part id which is stored when a student attempts
2809: a problem. The following are the columns of the table, in order:
2810: 'symb_id','part_id','student_id','transaction','tries','award','awarded',
2811: and 'previous'. The primary key is based on the first five columns listed
2812: above.
2813:
2814: =item C<$fulldump_timestamp_table()>
2815:
2816: The timestamp table holds the timestamps of the transactions which are
2817: stored in $fulldump_response_table and $fulldump_part_table. This data is
2818: about both the response and part data. Columns: 'symb_id','student_id',
2819: 'transaction', and 'timestamp'.
2820: The primary key is based on the first 3 columns.
2821:
2822: =item C<$weight_table()>
2823:
2824: The weight table holds the weight for the problems used in the class.
2825: Whereas the weight of a problem can vary by section and student the data
2826: here is applied to the class as a whole.
2827: Columns: 'symb_id','part_id','response_id','weight'.
2828:
2829: =back
2830:
2831:
2832: =head1 IMPORTANT SUBROUTINES
2833:
2834: Here is a brief overview of the subroutines which are likely to be of
2835: interest:
2836:
2837: =over 4
2838:
2839: =item C<&get_current_state()>
2840:
2841: programmers interface.
2842:
2843: =item C<&init_dbs()>
2844:
2845: table creation
2846:
2847: =item C<&update_student_data()>
2848:
2849: data storage calls
2850:
2851: =item C<&get_student_data_from_performance_cache()>
2852:
2853: data retrieval
2854:
2855: =back
2856:
2857: =head1 OTHER SUBROUTINES
2858:
2859: =over 4
2860:
2861: =item C<&make_into_hash($values)>
2862:
2863: Returns a reference to a hash as described by $values. $values is
2864: assumed to be the result of
2865: join(':',map {&escape($_)} %orighash);
2866:
2867: This is a helper function for get_current_state.
2868:
2869: =item C<&init_dbs()>
2870:
2871: Input: course id
2872:
2873: Output: 0 on success, positive integer on error
2874:
2875: This routine issues the calls to lonmysql to create the tables used to
2876: store student data.
2877:
2878: item C<&delete_caches()>
2879:
2880: This routine drops all the tables associated with a course from the
2881: MySQL database.
2882:
2883: Input: course id (optional, determined by environment if omitted)
2884:
2885: Returns: nothing
2886:
2887: =item C<&get_part_id()>
2888:
2889: Get the MySQL id of a problem part string.
2890:
2891: Input: $part
2892:
2893: Output: undef on error, integer $part_id on success.
2894:
2895: =item C<&get_part()>
2896:
2897: Get the string describing a part from the MySQL id of the problem part.
2898:
2899: Input: $part_id
2900:
2901: Output: undef on error, $part string on success.
2902:
2903: =item C<&get_symb_id()>
2904:
2905: Get the MySQL id of a symb.
2906:
2907: Input: $symb
2908:
2909: Output: undef on error, integer $symb_id on success.
2910:
2911: =item C<&get_symb()>
2912:
2913: Get the symb associated with a MySQL symb_id.
2914:
2915: Input: $symb_id
2916:
2917: Output: undef on error, $symb on success.
2918:
2919: =item C<&get_student_id()>
2920:
2921: Get the MySQL id of a student.
2922:
2923: Input: $sname, $dom
2924:
2925: Output: undef on error, integer $student_id on success.
2926:
2927: =item C<&get_student()>
2928:
2929: Get student username:domain associated with the MySQL student_id.
2930:
2931: Input: $student_id
2932:
2933: Output: undef on error, string $student (username:domain) on success.
2934:
2935: =item C<&clear_internal_caches()>
2936:
2937: Causes the internal caches used in get_student_id, get_student,
2938: get_symb_id, get_symb, get_part_id, and get_part to be undef'd.
2939:
2940: Needs to be called before the first operation with the MySQL database
2941: for a given Apache request.
2942:
2943: =item C<&update_full_student_data($sname,$sdom,$courseid)>
2944:
2945: Does a lonnet::dump on a student to populate the courses tables.
2946:
2947: Input: $sname, $sdom, $courseid
2948:
2949: Output: $returnstatus
2950:
2951: $returnstatus is a string describing any errors that occurred. 'okay' is the
2952: default.
2953:
2954: This subroutine loads a students data using lonnet::dump and inserts
2955: it into the MySQL database. The inserts are done on three tables,
2956: $fulldump_response_table, $fulldump_part_table, and $fulldump_timestamp_table.
2957: The INSERT calls are made directly by this subroutine, not through lonmysql
2958: because we do a 'bulk'insert which takes advantage of MySQLs non-SQL
2959: compliant INSERT command to insert multiple rows at a time.
2960: If anything has gone wrong during this process, $returnstatus is updated with
2961: a description of the error.
2962:
2963: Once the "fulldump" tables are updated, the tables used for chart and
2964: spreadsheet (which hold only the current state of the student on their
2965: homework, not historical data) are updated. If all updates have occurred
2966: successfully, $student_table is updated to reflect the time of the update.
2967:
2968: Notice we do not insert the data and immediately query it. This means it
2969: is possible for there to be data returned this first time that is not
2970: available the second time. CYA.
2971:
2972:
2973: =item C<&update_student_data()>
2974:
2975: Input: $sname, $sdom, $courseid
2976:
2977: Output: $returnstatus, \%student_data
2978:
2979: $returnstatus is a string describing any errors that occurred. 'okay' is the
2980: default.
2981: \%student_data is the data returned by a call to lonnet::currentdump.
2982:
2983: This subroutine loads a students data using lonnet::currentdump and inserts
2984: it into the MySQL database. The inserts are done on two tables,
2985: $performance_table and $parameters_table. $parameters_table holds the data
2986: that is not included in $performance_table. See the description of
2987: $performance_table elsewhere in this file. The INSERT calls are made
2988: directly by this subroutine, not through lonmysql because we do a 'bulk'
2989: insert which takes advantage of MySQLs non-SQL compliant INSERT command to
2990: insert multiple rows at a time. If anything has gone wrong during this
2991: process, $returnstatus is updated with a description of the error and
2992: \%student_data is returned.
2993:
2994: Notice we do not insert the data and immediately query it. This means it
2995: is possible for there to be data returned this first time that is not
2996: available the second time. CYA.
2997:
2998: =item &ensure_tables_are_set_up($courseid)
2999:
3000: Checks to be sure the MySQL tables for the given class are set up.
3001: If $courseid is omitted it will be obtained from the environment.
3002:
3003: Returns nothing on success and 'error' on failure
3004:
3005:
3006: =item C<&ensure_current_data()>
3007:
3008: Input: $sname, $sdom, $courseid
3009:
3010: Output: $status, $data
3011:
3012: This routine ensures the data for a given student is up to date.
3013: The $student_table is queried to determine the time of the last update.
3014: If the students data is out of date, &update_student_data() is called.
3015: The return values from the call to &update_student_data() are returned.
3016:
3017: =item C<&ensure_current_full_data($sname,$sdom,$courseid)>
3018:
3019: Input: $sname, $sdom, $courseid
3020:
3021: Output: $status
3022:
3023: This routine ensures the fulldata (the data from a lonnet::dump, not a
3024: lonnet::currentdump) for a given student is up to date.
3025: The $student_table is queried to determine the time of the last update.
3026: If the students fulldata is out of date, &update_full_student_data() is
3027: called.
3028:
3029: The return value from the call to &update_full_student_data() is returned.
3030:
3031: =item C<&get_student_data_from_performance_cache()>
3032:
3033: Input: $sname, $sdom, $symb, $courseid
3034:
3035: Output: hash reference containing the data for the given student.
3036: If $symb is undef, all the students data is returned.
3037:
3038: This routine is the heart of the local caching system. See the description
3039: of $performance_table, $symb_table, $student_table, and $part_table. The
3040: main task is building the MySQL request. The tables appear in the request
3041: in the order in which they should be parsed by MySQL. When searching
3042: on a student the $student_table is used to locate the 'student_id'. All
3043: rows in $performance_table which have a matching 'student_id' are returned,
3044: with data from $part_table and $symb_table which match the entries in
3045: $performance_table, 'part_id' and 'symb_id'. When searching on a symb,
3046: the $symb_table is processed first, with matching rows grabbed from
3047: $performance_table and filled in from $part_table and $student_table in
3048: that order.
3049:
3050: Running 'EXPLAIN ' on the 'SELECT' statements generated can be quite
3051: interesting, especially if you play with the order the tables are listed.
3052:
3053:
3054: =item C<&get_current_state()>
3055:
3056: Input: $sname,$sdom,$symb,$courseid
3057:
3058: Output: Described below
3059:
3060: Retrieve the current status of a students performance. $sname and
3061: $sdom are the only required parameters. If $symb is undef the results
3062: of an &Apache::lonnet::currentdump() will be returned.
3063: If $courseid is undef it will be retrieved from the environment.
3064:
3065: The return structure is based on &Apache::lonnet::currentdump. If
3066: $symb is unspecified, all the students data is returned in a hash of
3067: the form:
3068: (
3069: symb1 => { param1 => value1, param2 => value2 ... },
3070: symb2 => { param1 => value1, param2 => value2 ... },
3071: )
3072:
3073: If $symb is specified, a hash of
3074: (
3075: param1 => value1,
3076: param2 => value2,
3077: )
3078: is returned.
3079:
3080: If no data is found for $symb, or if the student has no performance data,
3081: an empty list is returned.
3082:
3083: =item C<&get_problem_statistics()>
3084:
3085: Gather data on a given problem. The database is assumed to be
3086: populated and all local caching variables are assumed to be set
3087: properly. This means you need to call &ensure_current_data for
3088: the students you are concerned with prior to calling this routine.
3089:
3090: Inputs: $Sections, Groups, $status, $symb, $part, $courseid, $starttime,
3091: $endtime
3092:
3093: =over 4
3094:
3095: =item $Sections Array ref containing section names for students.
3096: 'all' is allowed to be the first (and only) item in the array.
3097:
3098: =item $Groups Array ref containing group names for students.
3099: 'all' is allowed to be the first (and only) item in the array.
3100:
3101: =item $status String describing the status of students
3102:
3103: =item $symb is the symb for the problem.
3104:
3105: =item $part is the part id you need statistics for
3106:
3107: =item $courseid is the course id, of course!
3108:
3109: =item $starttime and $endtime are unix times which to use to limit
3110: the statistical data.
3111:
3112: =back
3113:
3114: Outputs: See the code for up to date information. A hash reference is
3115: returned. The hash has the following keys defined:
3116:
3117: =over 4
3118:
3119: =item * num_students
3120:
3121: The number of students attempting the problem
3122:
3123: =item tries
3124:
3125: The total number of tries for the students
3126:
3127: =item max_tries
3128:
3129: The maximum number of tries taken
3130:
3131: =item mean_tries
3132:
3133: The average number of tries
3134:
3135: =item num_solved T
3136:
3137: he number of students able to solve the problem
3138:
3139: =item num_override
3140:
3141: The number of students whose answer is 'correct_by_override'
3142:
3143: =item deg_of_diff
3144:
3145: The degree of difficulty of the problem
3146:
3147: =item std_tries
3148:
3149: The standard deviation of the number of tries
3150:
3151: =item skew_tries
3152:
3153: The skew of the number of tries
3154:
3155: =item per_wrong
3156:
3157: The number of students attempting the problem who were not
3158: able to answer it correctly.
3159:
3160: =back
3161:
3162: =item C<&populate_weight_table()>
3163:
3164: =item C<&limit_by_start_end_times()>
3165:
3166: Build SQL WHERE condition which limits the data collected by the start
3167: and end times provided
3168:
3169: Inputs: $starttime, $endtime, $table
3170:
3171: Returns: $time_limits
3172:
3173:
3174: =item C<&limit_by_section_and_status()C>
3175:
3176: Build SQL WHERE condition which limits the data collected by section and
3177: student status.
3178:
3179: Inputs: $Sections (array ref)
3180: $enrollment (string: 'any', 'expired', 'active')
3181: $tablename The name of the table that holds the student data
3182:
3183: Returns: $student_requirements,$enrollment_requirements
3184:
3185: =item C<&limit_by_group()>
3186:
3187: Build SQL LEFT JOIN statement to include students_groups and groupnames tables and SQL WHERE condition which limits the data collected by group.
3188:
3189: Inputs: $Groups (array ref)
3190: $stutable The name of the table which holds the student data.
3191: $grptable The name of the table which maps group_id to groupname.
3192: $stugrptab The name of the table which holds student group affiliations.
3193: Returns: $groups_join,$group_limits
3194: $groups_join JOIN part of SQL statement (to include group related tables)
3195: $group_limits SQL WHERE condition limiting to requested groups
3196:
3197: =item C<rank_students_by_scores_on_resources()>
3198:
3199: Inputs:
3200: $resources: array ref of hash ref. Each hash ref needs key 'symb'.
3201: $Sections: array ref of sections to include,
3202: $Groups: array ref of groups to include.
3203: $enrollment: string,
3204: $courseid (may be omitted)
3205: $starttime (may be omitted)
3206: $endtime (may be omitted)
3207: $has_award_for (may be omitted)
3208:
3209: Returns; An array of arrays. The sub arrays contain a student name and
3210: their score on the resources. $starttime and $endtime constrain the
3211: list to awards obtained during the given time limits. $has_score_on
3212: constrains the list to those students who at least attempted the
3213: resource identified by the given symb, which is used to filter out
3214: such students for statistics that would be adversely affected by such
3215: students.
3216:
3217: =item C<&get_sum_of_scores>
3218:
3219: Inputs: $resource (hash ref, needs {'symb'} key),
3220: $part, (the part id),
3221: $students (array ref, contents of array are scalars holding 'sname:sdom'),
3222: $courseid
3223:
3224: Returns: the sum of the score on the problem part over the students and the
3225: maximum possible value for the sum (taken from the weight table).
3226:
3227:
3228: =item C<&score_stats()>
3229:
3230: Inputs: $Sections, $enrollment, $symbs, $starttime,
3231: $endtime, $courseid
3232:
3233: $Sections, $enrollment, $starttime, $endtime, and $courseid are the same as
3234: elsewhere in this module.
3235: $symbs is an array ref of symbs
3236:
3237: Returns: minimum, maximum, mean, s.d., number of students, and maximum
3238: possible of student scores on the given resources
3239:
3240: =item C<&count_stats()>
3241:
3242: Inputs: $Sections, $Groups, $enrollment, $symbs, $starttime,
3243: $endtime, $courseid
3244:
3245: $Sections, $Groups $enrollment, $starttime, $endtime, and $courseid are the
3246: same as elsewhere in this module.
3247: $symbs is an array ref of symbs
3248:
3249: Returns: minimum, maximum, mean, s.d., and number of students
3250: of the number of items correct on the given resources
3251:
3252: =item C<get_student_data()>
3253:
3254: =item C<&get_student_scores($Sections,$Groups,$Symbs,$enrollment,$courseid)>
3255:
3256: =item C<&setup_table_names()>
3257:
3258: input: course id
3259:
3260: output: none
3261:
3262: =back
3263:
3264: =head3 End of Local Data Caching Subroutines
3265:
3266: =head3 Classlist Subroutines
3267:
3268: =over
3269:
3270: =item &get_classlist();
3271:
3272: Retrieve the classist of a given class or of the current class. Student
3273: information is returned from the classlist.db file and, if needed,
3274: from the students environment.
3275:
3276: Optional arguments are $cdom, and $cnum (course domain,
3277: and course number, respectively). If either is ommitted the course
3278: will be taken from the current environment ($env{'request.course.id'},
3279: $env{'course.'.$cid.'.domain'}, and $env{'course.'.$cid.'.num'}).
3280:
3281: Returns a reference to a hash which contains:
3282: keys '$sname:$sdom'
3283: values [$sdom,$sname,$end,$start,$id,$section,$fullname,$status,$type,
3284: $lockedtype,$credits,$instsec]
3285:
3286: The constant values CL_SDOM, CL_SNAME, CL_END, etc. can be used
3287: as indices into the returned list to future-proof clients against
3288: changes in the list order.
3289:
3290: =back
3291:
3292: =cut
3293:
3294:
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