1: # The LearningOnline Network with CAPA
2: #
3: # $Id: loncoursedata.pm,v 1.201.2.4 2021/03/04 23:55:05 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: my $requested_max_packet = 0;
1086: my $max_allowed_packet;
1087:
1088: sub store_student_data {
1089: my ($sname,$sdom,$courseid,$student_data) = @_;
1090: #
1091: my $student_id = &get_student_id($sname,$sdom);
1092: my $student = $sname.':'.$sdom;
1093: #
1094: my $returnstatus = 'okay';
1095: #
1096: # Remove all of the students data from the table
1097: my $dbh = &Apache::lonmysql::get_dbh();
1098: $dbh->do('DELETE FROM '.$performance_table.' WHERE student_id='.
1099: $student_id);
1100: $dbh->do('DELETE FROM '.$parameters_table.' WHERE student_id='.
1101: $student_id);
1102: #
1103: # Store away the data
1104: #
1105: my $starttime = Time::HiRes::time;
1106: my $elapsed = 0;
1107: my $rows_stored;
1108: my $store_parameters_prefix = 'INSERT IGNORE INTO '.$parameters_table.
1109: ' VALUES '."\n";
1110: my $num_parameters = 0;
1111: my $store_performance_prefix = 'INSERT IGNORE INTO '.$performance_table.
1112: ' VALUES '."\n";
1113: return ('error',undef) if (! defined($dbh));
1114: unless ($requested_max_packet) {
1115: (undef,$max_allowed_packet) = $dbh->selectrow_array(
1116: qq{show variables LIKE ? },
1117: undef,
1118: "max_allowed_packet");
1119: if ($max_allowed_packet !~ /^\d+$/) {
1120: $max_allowed_packet = '';
1121: }
1122: $requested_max_packet = 1;
1123: }
1124: my @store_parameters_values = ();
1125: my $curr_params_values = '';
1126: my $curr_params_length = 0;
1127: my @store_performance_values = ();
1128: my $curr_perf_values = '';
1129: my $curr_perf_length = 0;
1130: my ($max_param,$max_perf);
1131: if ($max_allowed_packet) {
1132: $max_param = $max_allowed_packet - length($store_parameters_prefix);
1133: $max_perf = $max_allowed_packet - length($store_performance_prefix);
1134: }
1135: while (my ($current_symb,$param_hash) = each(%{$student_data})) {
1136: #
1137: # make sure the symb is set up properly
1138: my $symb_id = &get_symb_id($current_symb);
1139: #
1140: # Parameters
1141: while (my ($parameter,$value) = each(%$param_hash)) {
1142: if ($parameter !~ /(timestamp|resource\.(.*)\.(solved|tries|awarded|award|awarddetail|previous))/) {
1143: my $sql_parameter = "('".join("','",
1144: $symb_id,$student_id,
1145: $parameter)."',".
1146: $dbh->quote($value)."),\n";
1147: if ($sql_parameter !~ /''/) {
1148: if ($max_param) {
1149: my $length = length($sql_parameter);
1150: if ($length > $max_param) {
1151: &Apache::lonnet::logthis("SQL parameter insert for student: $sname for parameter: $parameter would exceed max_allowed_packet size");
1152: &Apache::lonnet::logthis("symb_id: $symb_id");
1153: &Apache::lonnet::logthis("You may want to increase the max_allowed_packet size from the current: $max_allowed_packet");
1154: if ($parameter =~ /\.submission$/) {
1155: $sql_parameter = "('".join("','",
1156: $symb_id,$student_id,
1157: $parameter)."',".
1158: $dbh->quote('WARNING: Submission too large -- see grading interface for actual submission')."),\n";
1159: $length = length($sql_parameter);
1160: &Apache::lonnet::logthis("Placeholder inserted instead of value of actual submission");
1161: &Apache::lonnet::logthis("See grading interface for the actual submission");
1162: } else {
1163: &Apache::lonnet::logthis("Skipping this item");
1164: next;
1165: }
1166: }
1167: if ($length + $curr_params_length > $max_param) {
1168: push(@store_parameters_values,$curr_params_values);
1169: $curr_params_values = $sql_parameter;
1170: $curr_params_length = $length;
1171: } else {
1172: $curr_params_values .= $sql_parameter;
1173: $curr_params_length += $length;
1174: }
1175: } else {
1176: $curr_params_values .= $sql_parameter;
1177: }
1178: #$rows_stored++;
1179: $num_parameters ++;
1180: }
1181: }
1182: }
1183: # Performance
1184: my %stored;
1185: while (my ($parameter,$value) = each(%$param_hash)) {
1186: next if ($parameter !~ /^resource\.(.*)\.(solved|awarded)$/);
1187: my $part = $1;
1188: my $which = $2;
1189: next if ($part =~ /\./);
1190: next if (exists($stored{$part}));
1191: $stored{$part}++;
1192: #
1193: my $part_id = &get_part_id($part);
1194: next if (!defined($part_id));
1195:
1196: my ($solved,$awarded);
1197: if ($which eq 'solved') {
1198: $solved = $value;
1199: $awarded = $param_hash->{'resource.'.$part.'.awarded'};
1200: } else {
1201: $solved = $param_hash->{'resource.'.$part.'.solved'};
1202: $awarded = $value;
1203: }
1204: my $award = $param_hash->{'resource.'.$part.'.award'};
1205: my $awarddetail = $param_hash->{'resource.'.$part.'.awarddetail'};
1206: my $timestamp = $param_hash->{'timestamp'};
1207: my $tries = $param_hash->{'resource.'.$part.'.tries'};
1208: if (&symb_is_for_task($current_symb)) {
1209: $tries = $param_hash->{'resource.'.$part.'.version'};
1210: }
1211: #
1212: $solved = '' if (! defined($solved));
1213: $tries = '' if (! defined($tries));
1214: $awarded = '' if (! defined($awarded));
1215: $award = '' if (! defined($award));
1216: $awarddetail = '' if (! defined($awarddetail));
1217: my $sql_performance =
1218: "('".join("','",$symb_id,$student_id,$part_id,$part,
1219: $solved,$tries,$awarded,$award,
1220: $awarddetail,$timestamp)."'),\n";
1221: if ($max_perf) {
1222: my $length = length($sql_performance);
1223: if ($length > $max_perf) {
1224: &Apache::lonnet::logthis("SQL performance insert for student: $sname would exceed max_allowed_packet size");
1225: &Apache::lonnet::logthis("symb_id: $symb_id");
1226: &Apache::lonnet::logthis("Skipping this item. You may want to increase the max_allowed_packet size from the current: $max_allowed_packet");
1227: next;
1228: } else {
1229: if ($length + $curr_perf_length > $max_perf) {
1230: push(@store_performance_values,$curr_perf_values);
1231: $curr_perf_values = $sql_performance;
1232: $curr_perf_length = $length;
1233: } else {
1234: $curr_perf_values .= $sql_performance;
1235: $curr_perf_length += $length;
1236: }
1237: }
1238: } else {
1239: $curr_perf_values .= $sql_performance;
1240: }
1241: $rows_stored++;
1242: }
1243: }
1244: if ($curr_params_values ne '') {
1245: push(@store_parameters_values,$curr_params_values);
1246: }
1247: if ($curr_perf_values ne '') {
1248: push(@store_performance_values,$curr_perf_values);
1249: }
1250: if (! $rows_stored) { return ($returnstatus, undef); }
1251: my $start = Time::HiRes::time;
1252: foreach my $item (@store_performance_values) {
1253: $item =~ s|,\n$||;
1254: if ($item ne '') {
1255: $dbh->do($store_performance_prefix.$item);
1256: if ($dbh->err()) {
1257: &Apache::lonnet::logthis('performance insert error:'.
1258: $dbh->errstr());
1259: &Apache::lonnet::logthis('command = '.$/.$store_performance_prefix.$item);
1260: $returnstatus = 'error: unable to insert performance into database';
1261: return ($returnstatus,$student_data);
1262: }
1263: }
1264: }
1265: if ($num_parameters > 0) {
1266: foreach my $item (@store_parameters_values) {
1267: $item =~ s|,\n$||;
1268: if ($item ne '') {
1269: $dbh->do($store_parameters_prefix.$item);
1270: if ($dbh->err()) {
1271: &Apache::lonnet::logthis('parameters insert error:'.
1272: $dbh->errstr());
1273: &Apache::lonnet::logthis('command = '.$/.$store_parameters_prefix.$item);
1274: &Apache::lonnet::logthis('rows_stored = '.$rows_stored);
1275: &Apache::lonnet::logthis('student_id = '.$student_id);
1276: $returnstatus = 'error: unable to insert parameters into database';
1277: return ($returnstatus,$student_data);
1278: }
1279: }
1280: }
1281: }
1282: $elapsed += Time::HiRes::time - $start;
1283: return ($returnstatus,$student_data);
1284: }
1285:
1286:
1287: sub ensure_tables_are_set_up {
1288: my ($courseid) = @_;
1289: $courseid = $env{'request.course.id'} if (! defined($courseid));
1290: #
1291: # Clean out package variables
1292: &setup_table_names($courseid);
1293: #
1294: # if the tables do not exist, make them
1295: my @CurrentTable = &Apache::lonmysql::tables_in_db();
1296: my ($found_symb,$found_student,$found_groups,$found_groupnames,$found_part,
1297: $found_performance,$found_parameters,$found_fulldump_part,
1298: $found_fulldump_response,$found_fulldump_timestamp,
1299: $found_weight);
1300: foreach (@CurrentTable) {
1301: $found_symb = 1 if ($_ eq $symb_table);
1302: $found_student = 1 if ($_ eq $student_table);
1303: $found_groups = 1 if ($_ eq $students_groups_table);
1304: $found_groupnames = 1 if ($_ eq $groupnames_table);
1305: $found_part = 1 if ($_ eq $part_table);
1306: $found_performance = 1 if ($_ eq $performance_table);
1307: $found_parameters = 1 if ($_ eq $parameters_table);
1308: $found_fulldump_part = 1 if ($_ eq $fulldump_part_table);
1309: $found_fulldump_response = 1 if ($_ eq $fulldump_response_table);
1310: $found_fulldump_timestamp = 1 if ($_ eq $fulldump_timestamp_table);
1311: $found_weight = 1 if ($_ eq $weight_table);
1312: }
1313: if (!$found_symb ||
1314: !$found_student || !$found_part ||
1315: !$found_performance || !$found_parameters ||
1316: !$found_fulldump_part || !$found_fulldump_response ||
1317: !$found_fulldump_timestamp || !$found_weight ) {
1318: if (&init_dbs($courseid,1)) {
1319: return 'error';
1320: }
1321: }
1322: }
1323:
1324: sub ensure_current_data {
1325: my ($sname,$sdom,$courseid) = @_;
1326: my $status = 'okay'; # return value
1327: #
1328: $courseid = $env{'request.course.id'} if (! defined($courseid));
1329: &ensure_tables_are_set_up($courseid);
1330: #
1331: # Get the update time for the user
1332: my $updatetime = 0;
1333: my $getuserdir = 1;
1334: my $modifiedtime = &Apache::lonnet::GetFileTimestamp
1335: ($sdom,$sname,$courseid.'.db',$getuserdir);
1336: #
1337: if ($modifiedtime == -1) {
1338: return ('no data',undef);
1339: }
1340:
1341: my $student_id = &get_student_id($sname,$sdom);
1342: &get_students_groupids($student_id);
1343: my @Result = &Apache::lonmysql::get_rows($student_table,
1344: "student_id ='$student_id'");
1345: my $data = undef;
1346: if (@Result) {
1347: $updatetime = $Result[0]->[6]; # Ack! This is dumb!
1348: }
1349: if ($modifiedtime > $updatetime) {
1350: ($status,$data) = &update_student_data($sname,$sdom,$courseid);
1351: }
1352: return ($status,$data);
1353: }
1354:
1355:
1356: sub ensure_current_full_data {
1357: my ($sname,$sdom,$courseid) = @_;
1358: my $status = 'okay'; # return value
1359: #
1360: $courseid = $env{'request.course.id'} if (! defined($courseid));
1361: &ensure_tables_are_set_up($courseid);
1362: #
1363: # Get the update time for the user
1364: my $getuserdir = 1;
1365: my $modifiedtime = &Apache::lonnet::GetFileTimestamp
1366: ($sdom,$sname,$courseid.'.db',$getuserdir);
1367: #
1368: my $student_id = &get_student_id($sname,$sdom);
1369: &get_students_groupids($student_id);
1370: my @Result = &Apache::lonmysql::get_rows($student_table,
1371: "student_id ='$student_id'");
1372: my $updatetime;
1373: if (@Result && ref($Result[0]) eq 'ARRAY') {
1374: $updatetime = $Result[0]->[7];
1375: }
1376: if (! defined($updatetime) || $modifiedtime > $updatetime) {
1377: $status = &update_full_student_data($sname,$sdom,$courseid);
1378: }
1379: return $status;
1380: }
1381:
1382: sub ensure_current_groups {
1383: my ($courseid) = @_;
1384: my ($cdom,$cnum);
1385: if (defined($courseid)) {
1386: my %coursehash = &Apache::lonnet::coursedescription($courseid);
1387: $cdom = $coursehash{'domain'};
1388: $cnum = $coursehash{'num'};
1389: } elsif ($env{'request.course.id'}) {
1390: $courseid = $env{'request.course.id'};
1391: $cdom = $env{'course.'.$courseid.'.domain'};
1392: $cnum = $env{'course.'.$courseid.'.num'};
1393: }
1394: if ($cdom eq '' || $cnum eq '') {
1395: return 'error: invalid course';
1396: }
1397: &setup_table_names($courseid);
1398: my @CurrentTables = &Apache::lonmysql::tables_in_db();
1399: unless (grep(/^\Q$groupnames_table\E$/,@CurrentTables)) {
1400: return;
1401: }
1402: # Get the update time for the groupnames table
1403: my $getuserdir = 1;
1404: my $modifiedtime = &Apache::lonnet::GetFileTimestamp
1405: ($cdom,$cnum,'coursegroups.db',$getuserdir);
1406: my %tableinfo = &Apache::lonmysql::table_information($groupnames_table);
1407: my $updatetime;
1408: if ($tableinfo{'Update_time'}) {
1409: $updatetime = $tableinfo{'Update_time'};
1410: }
1411: if (! defined($updatetime) || $modifiedtime > $updatetime) {
1412: my (%groups_in_sql,%removegroups,$addgroup);
1413: my %curr_groups = &Apache::longroup::coursegroups($cdom,$cnum);
1414: my @Result = &Apache::lonmysql::get_rows($groupnames_table);
1415: foreach my $row (@Result) {
1416: my ($id,$name) = @{$row};
1417: unless (exists($curr_groups{$name})) {
1418: $groups_in_sql{$name}=$id;
1419: } elsif ($id) {
1420: $removegroups{$id} = $name;
1421: }
1422: }
1423: foreach my $group (keys(%curr_groups)) {
1424: unless (exists($groups_in_sql{$group})) {
1425: $addgroup = 1;
1426: last;
1427: }
1428: }
1429: if (keys(%removegroups)) {
1430: my $dbh = &Apache::lonmysql::get_dbh();
1431: foreach my $group_id (keys(%removegroups)) {
1432: my $command = 'DELETE FROM '.$groupnames_table.' WHERE group_id='.
1433: $group_id;
1434: $dbh->do($command);
1435: if ($dbh->err()) {
1436: &Apache::lonnet::logthis("error ".$dbh->errstr().
1437: " occurred executing \n".
1438: "SQL command: $command");
1439: }
1440: }
1441: }
1442: if ($addgroup) {
1443: &populate_groupnames_table($courseid);
1444: }
1445: }
1446: return;
1447: }
1448:
1449: sub ensure_current_students_groups {
1450: my ($courseid) = @_;
1451: my ($cdom,$cnum);
1452: if (defined($courseid)) {
1453: my %coursehash = &Apache::lonnet::coursedescription($courseid);
1454: $cdom = $coursehash{'domain'};
1455: $cnum = $coursehash{'num'};
1456: } elsif ($env{'request.course.id'}) {
1457: $courseid = $env{'request.course.id'};
1458: $cdom = $env{'course.'.$courseid.'.domain'};
1459: $cnum = $env{'course.'.$courseid.'.num'};
1460: }
1461: &setup_table_names($courseid);
1462: my @CurrentTables = &Apache::lonmysql::tables_in_db();
1463: unless (grep(/^\Q$students_groups_table\E$/,@CurrentTables)) {
1464: return;
1465: }
1466: # Get the update time for the groupnames table
1467: my $getuserdir = 1;
1468: my $modifiedtime = &Apache::lonnet::GetFileTimestamp
1469: ($cdom,$cnum,'groupmembership.db',$getuserdir);
1470: my %tableinfo = &Apache::lonmysql::table_information($students_groups_table);
1471: my $updatetime;
1472: if ($tableinfo{'Update_time'}) {
1473: $updatetime = $tableinfo{'Update_time'};
1474: }
1475: if ((!defined($updatetime)) || ($modifiedtime > $updatetime)) {
1476: if (&Apache::lonmysql::drop_table($students_groups_table)) {
1477: if (&init_dbs($courseid)) {
1478: return "error creating $students_groups_table\n";
1479: } else {
1480: &populate_students_groups_table($courseid);
1481: }
1482: }
1483: }
1484: return;
1485: }
1486:
1487: sub ensure_current_sections {
1488: my ($courseid) = @_;
1489: my ($cdom,$cnum);
1490: if (defined($courseid)) {
1491: my %coursehash = &Apache::lonnet::coursedescription($courseid);
1492: $cdom = $coursehash{'domain'};
1493: $cnum = $coursehash{'num'};
1494: } elsif ($env{'request.course.id'}) {
1495: $courseid = $env{'request.course.id'};
1496: $cdom = $env{'course.'.$courseid.'.domain'};
1497: $cnum = $env{'course.'.$courseid.'.num'};
1498: }
1499: &setup_table_names($courseid);
1500: my @CurrentTables = &Apache::lonmysql::tables_in_db();
1501: unless (grep(/^\Q$student_table\E$/,@CurrentTables)) {
1502: return;
1503: }
1504: # Get the update time for the student table
1505: my $getuserdir = 1;
1506: my $modifiedtime = &Apache::lonnet::GetFileTimestamp
1507: ($cdom,$cnum,'classlist.db',$getuserdir);
1508: my %tableinfo = &Apache::lonmysql::table_information($student_table);
1509: my $updatetime;
1510: if ($tableinfo{'Update_time'}) {
1511: $updatetime = $tableinfo{'Update_time'};
1512: }
1513: if ((!defined($updatetime)) || ($modifiedtime > $updatetime)) {
1514: &update_student_table($cdom,$cnum);
1515: }
1516: return;
1517: }
1518:
1519: sub update_student_table {
1520: my ($cdom,$cnum) = @_;
1521: return unless (($cdom ne '') && ($cnum ne ''));
1522: my (%roster,%sqldata);
1523: my $classlist = &get_classlist($cdom,$cnum);
1524: while (my ($student,$data) = each (%$classlist)) {
1525: my ($section,$start,$end) = ($data->[&CL_SECTION()],
1526: $data->[&CL_START()],
1527: $data->[&CL_END()]);
1528: if ($section eq '' || $section =~ /^\s*$/) {
1529: $section = 'none';
1530: }
1531: if ($start eq '') { $start = 0; }
1532: if ($end eq '') { $end = 0; }
1533: $roster{$student}{'section'} = $section;
1534: $roster{$student}{'start'} = $start;
1535: $roster{$student}{'end'} = $end;
1536: }
1537: my $dbh = &Apache::lonmysql::get_dbh();
1538: my $statement = "SELECT student_id,student,section,start,end FROM $student_table";
1539: my $sth = $dbh->prepare($statement);
1540: $sth->execute();
1541: if ($sth->err()) {
1542: &Apache::lonnet::logthis("Unable to execute MySQL request:");
1543: &Apache::lonnet::logthis("\n".$statement."\n");
1544: &Apache::lonnet::logthis("error is:".$sth->errstr());
1545: return undef;
1546: }
1547: foreach my $row (@{$sth->fetchall_arrayref}) {
1548: my ($id,$student,$section,$start,$end) = (@$row);
1549: if (ref($roster{$student}) eq 'HASH') {
1550: if (($roster{$student}{'section'} ne $section) ||
1551: ($roster{$student}{'start'} ne $start) ||
1552: ($roster{$student}{'end'} ne $end)) {
1553: $sqldata{$id} = {
1554: section => $roster{$student}{'section'},
1555: start => $roster{$student}{'start'},
1556: end => $roster{$student}{'end'},
1557: };
1558: }
1559: }
1560: }
1561: $sth->finish();
1562: if (keys(%sqldata)) {
1563: foreach my $id (sort { $a <=> $b } keys(%sqldata)) {
1564: my $request = "UPDATE $student_table SET section='$sqldata{$id}{section}'".
1565: ", start='$sqldata{$id}{start}'".
1566: ", end='$sqldata{$id}{end}' WHERE student_id='$id'";
1567: $dbh->do($request);
1568: }
1569: }
1570: return;
1571: }
1572:
1573: sub get_student_data_from_performance_cache {
1574: my ($sname,$sdom,$symb,$courseid)=@_;
1575: my $student = $sname.':'.$sdom if (defined($sname) && defined($sdom));
1576: &setup_table_names($courseid);
1577: #
1578: # Return hash
1579: my $studentdata;
1580: #
1581: my $dbh = &Apache::lonmysql::get_dbh();
1582: my $request = "SELECT ".
1583: "d.symb,a.part,a.solved,a.tries,a.awarded,a.award,a.awarddetail,".
1584: "a.timestamp ";
1585: if (defined($student)) {
1586: $request .= "FROM $student_table AS b ".
1587: "LEFT JOIN $performance_table AS a ON b.student_id=a.student_id ".
1588: # "LEFT JOIN $part_table AS c ON c.part_id = a.part_id ".
1589: "LEFT JOIN $symb_table AS d ON d.symb_id = a.symb_id ".
1590: "WHERE student='$student'";
1591: if (defined($symb) && $symb ne '') {
1592: $request .= " AND d.symb=".$dbh->quote($symb);
1593: }
1594: } elsif (defined($symb) && $symb ne '') {
1595: $request .= "FROM $symb_table as d ".
1596: "LEFT JOIN $performance_table AS a ON d.symb_id=a.symb_id ".
1597: # "LEFT JOIN $part_table AS c ON c.part_id = a.part_id ".
1598: "LEFT JOIN $student_table AS b ON b.student_id = a.student_id ".
1599: "WHERE symb='".$dbh->quote($symb)."'";
1600: }
1601: my $starttime = Time::HiRes::time;
1602: my $rows_retrieved = 0;
1603: my $sth = $dbh->prepare($request);
1604: $sth->execute();
1605: if ($sth->err()) {
1606: &Apache::lonnet::logthis("Unable to execute MySQL request:");
1607: &Apache::lonnet::logthis("\n".$request."\n");
1608: &Apache::lonnet::logthis("error is:".$sth->errstr());
1609: return undef;
1610: }
1611: foreach my $row (@{$sth->fetchall_arrayref}) {
1612: $rows_retrieved++;
1613: my ($symb,$part,$solved,$tries,$awarded,$award,$awarddetail,$time) =
1614: (@$row);
1615: my $base = 'resource.'.$part;
1616: $studentdata->{$symb}->{$base.'.solved'} = $solved;
1617: $studentdata->{$symb}->{$base.'.tries'} = $tries;
1618: $studentdata->{$symb}->{$base.'.awarded'} = $awarded;
1619: $studentdata->{$symb}->{$base.'.award'} = $award;
1620: $studentdata->{$symb}->{$base.'.awarddetail'} = $awarddetail;
1621: $studentdata->{$symb}->{'timestamp'} = $time if (defined($time) && $time ne '');
1622: }
1623: ## Get misc parameters
1624: $request = 'SELECT c.symb,a.parameter,a.value '.
1625: "FROM $student_table AS b ".
1626: "LEFT JOIN $parameters_table AS a ON b.student_id=a.student_id ".
1627: "LEFT JOIN $symb_table AS c ON c.symb_id = a.symb_id ".
1628: "WHERE student='$student'";
1629: if (defined($symb) && $symb ne '') {
1630: $request .= " AND c.symb=".$dbh->quote($symb);
1631: }
1632: $sth = $dbh->prepare($request);
1633: $sth->execute();
1634: if ($sth->err()) {
1635: &Apache::lonnet::logthis("Unable to execute MySQL request:");
1636: &Apache::lonnet::logthis("\n".$request."\n");
1637: &Apache::lonnet::logthis("error is:".$sth->errstr());
1638: if (defined($symb) && $symb ne '') {
1639: $studentdata = $studentdata->{$symb};
1640: }
1641: return $studentdata;
1642: }
1643: #
1644: foreach my $row (@{$sth->fetchall_arrayref}) {
1645: $rows_retrieved++;
1646: my ($symb,$parameter,$value) = (@$row);
1647: $studentdata->{$symb}->{$parameter} = $value;
1648: }
1649: #
1650: if (defined($symb) && $symb ne '') {
1651: $studentdata = $studentdata->{$symb};
1652: }
1653: return $studentdata;
1654: }
1655:
1656:
1657: sub get_current_state {
1658: my ($sname,$sdom,$symb,$courseid,$forcedownload)=@_;
1659: #
1660: $courseid = $env{'request.course.id'} if (! defined($courseid));
1661: #
1662: return () if (! defined($sname) || ! defined($sdom));
1663: #
1664: my ($status,$data) = &ensure_current_data($sname,$sdom,$courseid);
1665: # &Apache::lonnet::logthis
1666: # ('sname = '.$sname.
1667: # ' domain = '.$sdom.
1668: # ' status = '.$status.
1669: # ' data is '.(defined($data)?'defined':'undefined'));
1670: # while (my ($symb,$hash) = each(%$data)) {
1671: # &Apache::lonnet::logthis($symb."\n----------------------------------");
1672: # while (my ($key,$value) = each (%$hash)) {
1673: # &Apache::lonnet::logthis(" ".$key." = ".$value);
1674: # }
1675: # }
1676: #
1677: if (defined($data) && defined($symb) && ref($data->{$symb})) {
1678: return %{$data->{$symb}};
1679: } elsif (defined($data) && ! defined($symb) && ref($data)) {
1680: return %$data;
1681: }
1682: if ($status eq 'no data') {
1683: return ();
1684: } else {
1685: if ($status ne 'okay' && $status ne '') {
1686: &Apache::lonnet::logthis('status = '.$status);
1687: return ('error: '.$status,undef);
1688: }
1689: my $returnhash = &get_student_data_from_performance_cache($sname,$sdom,
1690: $symb,$courseid);
1691: return %$returnhash if (defined($returnhash));
1692: }
1693: return ();
1694: }
1695:
1696:
1697: sub get_problem_statistics {
1698: my ($Sections,$Groups,$status,$symb,$part,$courseid,$starttime,$endtime) = @_;
1699: return if (! defined($symb) || ! defined($part));
1700: $courseid = $env{'request.course.id'} if (! defined($courseid));
1701: #
1702: &setup_table_names($courseid);
1703: my $symb_id = &get_symb_id($symb);
1704: my $part_id = &get_part_id($part);
1705: my $stats_table = &temp_table_name($courseid,'problem_stats');
1706: #
1707: my $dbh = &Apache::lonmysql::get_dbh();
1708: return undef if (! defined($dbh));
1709: #
1710: # Clean out the table
1711: $dbh->do('DROP TABLE '.$stats_table); # May return an error
1712: my $request =
1713: 'CREATE TEMPORARY TABLE '.$stats_table.' '.
1714: 'SELECT a.student_id,a.solved,a.award,a.awarded,a.tries '.
1715: 'FROM '.$performance_table.' AS a ';
1716: #
1717: # See if we need to include some requirements on the students
1718: if ((defined($Sections) && lc($Sections->[0]) ne 'all') ||
1719: (defined($status) && lc($status) ne 'any')) {
1720: $request .= 'NATURAL LEFT JOIN '.$student_table.' AS b ';
1721: }
1722: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
1723: if (defined($groups_join)) {
1724: $request .= $groups_join;
1725: }
1726: $request .= ' WHERE a.symb_id='.$symb_id.' AND a.part_id='.$part_id;
1727: #
1728: # Limit the students included to those specified
1729: my ($section_limits,$enrollment_limits)=
1730: &limit_by_section_and_status($Sections,$status,'b');
1731: #
1732: # Limit by starttime and endtime
1733: my $time_requirements = undef;
1734: if (defined($starttime)) {
1735: $time_requirements .= 'a.timestamp>='.$starttime;
1736: if (defined($endtime)) {
1737: $time_requirements .= ' AND a.timestamp<='.$endtime;
1738: }
1739: } elsif (defined($endtime)) {
1740: $time_requirements .= 'a.timestamp<='.$endtime;
1741: }
1742: if (defined($time_requirements)) {
1743: $request .= ' AND '.$time_requirements;
1744: }
1745: if (defined($section_limits)) {
1746: $request .= ' AND '.$section_limits;
1747: }
1748: if (defined($enrollment_limits)) {
1749: $request .= ' AND '.$enrollment_limits;
1750: }
1751: # Limit by group, as required
1752: if (defined($group_limits)) {
1753: $request .= ' AND '.$group_limits;
1754: }
1755: #
1756: # Finally, execute the request to create the temporary table
1757: $dbh->do($request);
1758: #
1759: # Collect the first suite of statistics
1760: $request = 'SELECT COUNT(*),SUM(tries),'.
1761: 'AVG(tries),STD(tries) '.
1762: 'FROM '.$stats_table;
1763: my ($num,$tries,$mean,$STD) = &execute_SQL_request
1764: ($dbh,$request);
1765: #
1766: $request = 'SELECT MAX(tries),MIN(tries) FROM '.$stats_table.
1767: ' WHERE awarded>0';
1768: my ($max,$min) = &execute_SQL_request($dbh,$request);
1769: #
1770: $request = 'SELECT SUM(awarded) FROM '.$stats_table;
1771: my ($Solved) = &execute_SQL_request($dbh,$request);
1772: #
1773: $request = 'SELECT SUM(awarded) FROM '.$stats_table.
1774: " WHERE solved='correct_by_override'";
1775: my ($solved) = &execute_SQL_request($dbh,$request);
1776: #
1777: $Solved -= $solved;
1778: #
1779: $num = 0 if (! defined($num));
1780: $tries = 0 if (! defined($tries));
1781: $max = 0 if (! defined($max));
1782: $min = 0 if (! defined($min));
1783: $STD = 0 if (! defined($STD));
1784: $Solved = 0 if (! defined($Solved) || $Solved < 0);
1785: $solved = 0 if (! defined($solved));
1786: #
1787: # Compute the more complicated statistics
1788: my $DegOfDiff = 'nan';
1789: $DegOfDiff = 1-($Solved)/$tries if ($tries>0);
1790: #
1791: my $SKEW = 'nan';
1792: my $wrongpercent = 0;
1793: my $numwrong = 'nan';
1794: if ($num > 0) {
1795: ($SKEW) = &execute_SQL_request($dbh,'SELECT SQRT(SUM('.
1796: 'POWER(tries - '.$STD.',3)'.
1797: '))/'.$num.' FROM '.$stats_table);
1798: $numwrong = $num-$Solved;
1799: $wrongpercent=int(10*100*$numwrong/$num)/10;
1800: }
1801: #
1802: # Drop the temporary table
1803: $dbh->do('DROP TABLE '.$stats_table); # May return an error
1804: #
1805: # Return result
1806: return { num_students => $num,
1807: tries => $tries,
1808: max_tries => $max,
1809: min_tries => $min,
1810: mean_tries => $mean,
1811: std_tries => $STD,
1812: skew_tries => $SKEW,
1813: num_solved => $Solved,
1814: num_override => $solved,
1815: num_wrong => $numwrong,
1816: per_wrong => $wrongpercent,
1817: deg_of_diff => $DegOfDiff };
1818: }
1819:
1820: ##
1821: ## This is a helper for get_statistics
1822: sub execute_SQL_request {
1823: my ($dbh,$request)=@_;
1824: # &Apache::lonnet::logthis($request);
1825: my $sth = $dbh->prepare($request);
1826: if (!$sth) {
1827: die($dbh->errstr . " SQL: $request");
1828: }
1829: $sth->execute();
1830: my $row = $sth->fetchrow_arrayref();
1831: if (ref($row) eq 'ARRAY' && scalar(@$row)>0) {
1832: return @$row;
1833: }
1834: return ();
1835: }
1836:
1837:
1838: sub populate_weight_table {
1839: my ($courseid) = @_;
1840: if (! defined($courseid)) {
1841: $courseid = $env{'request.course.id'};
1842: }
1843: #
1844: &setup_table_names($courseid);
1845: my $navmap = Apache::lonnavmaps::navmap->new();
1846: if (!defined($navmap)) {
1847: &Apache::lonnet::logthis('loncoursedata::populate_weight_table:'.$/.
1848: ' unable to get navmaps resource'.$/.
1849: ' '.join(' ',(caller)));
1850: return;
1851: }
1852: my @sequences = $navmap->retrieveResources(undef,
1853: sub { shift->is_map(); },1,0,1);
1854: my @resources;
1855: foreach my $seq (@sequences) {
1856: push(@resources,$navmap->retrieveResources($seq,
1857: sub {shift->is_problem();},
1858: 0,0,0));
1859: }
1860: if (! scalar(@resources)) {
1861: &Apache::lonnet::logthis('loncoursedata::populate_weight_table:'.$/.
1862: ' no resources returned for '.$courseid);
1863: return;
1864: }
1865: # Since we use lonnet::EXT to retrieve problem weights,
1866: # to ensure current data we must clear the caches out.
1867: &Apache::lonnet::clear_EXT_cache_status();
1868: my $dbh = &Apache::lonmysql::get_dbh();
1869: my $request = 'INSERT IGNORE INTO '.$weight_table.
1870: "(symb_id,part_id,weight) VALUES ";
1871: my $weight;
1872: foreach my $res (@resources) {
1873: my $symb_id = &get_symb_id($res->symb);
1874: foreach my $part (@{$res->parts}) {
1875: my $part_id = &get_part_id($part);
1876: $weight = &Apache::lonnet::EXT('resource.'.$part.'.weight',
1877: $res->symb,
1878: undef,undef,undef);
1879: if (!defined($weight) || ($weight eq '')) {
1880: $weight=1;
1881: }
1882: $request .= "('".$symb_id."','".$part_id."','".$weight."'),";
1883: }
1884: }
1885: $request =~ s/(,)$//;
1886: # &Apache::lonnet::logthis('request = '.$/.$request);
1887: $dbh->do($request);
1888: if ($dbh->err()) {
1889: &Apache::lonnet::logthis("error ".$dbh->errstr().
1890: " occurred executing \n".
1891: $request);
1892: }
1893: return;
1894: }
1895:
1896: sub limit_by_start_end_time {
1897: my ($starttime,$endtime,$table) = @_;
1898: my $time_requirements = undef;
1899: if (defined($starttime)) {
1900: $time_requirements .= $table.".timestamp>='".$starttime."'";
1901: if (defined($endtime)) {
1902: $time_requirements .= " AND ".$table.".timestamp<='".$endtime."'";
1903: }
1904: } elsif (defined($endtime)) {
1905: $time_requirements .= $table.".timestamp<='".$endtime."'";
1906: }
1907: return $time_requirements;
1908: }
1909:
1910:
1911: sub limit_by_section_and_status {
1912: my ($Sections,$enrollment,$tablename) = @_;
1913: my $student_requirements = undef;
1914: if ( (defined($Sections) && $Sections->[0] ne 'all')) {
1915: $student_requirements = '('.
1916: join(' OR ', map { $tablename.".section='".$_."'" } @$Sections
1917: ).')';
1918: }
1919: my $enrollment_requirements=undef;
1920: if (defined($enrollment) && $enrollment ne 'Any') {
1921: my $now = time();
1922: if ( $enrollment eq 'Future' ) {
1923: $enrollment_requirements =
1924: "( $tablename.start > $now AND ".
1925: "( $tablename.end = 0 OR $tablename.end > $now))";
1926: } elsif ( $enrollment eq 'Active' ) {
1927: $enrollment_requirements =
1928: "(( $tablename.start = 0 OR $tablename.start < $now ) AND ".
1929: " ( $tablename.end = 0 OR $tablename.end > $now ))";
1930: } elsif ( $enrollment eq 'Expired' ) {
1931: $enrollment_requirements =
1932: "(( $tablename.start < $now ) AND ".
1933: " ( $tablename.end < $now ))";
1934: }
1935: }
1936: return ($student_requirements,$enrollment_requirements);
1937: }
1938:
1939:
1940:
1941: sub limit_by_group {
1942: my ($Groups,$stutable,$grptable,$stugrptab) = @_;
1943: my $groups_join = undef;
1944: my $group_limits = undef;
1945: if ( (defined($Groups) && $Groups->[0] ne 'all')) {
1946: $groups_join =
1947: ' LEFT JOIN '.$students_groups_table.
1948: ' AS '.$stugrptab.' ON '.
1949: $stugrptab.'.student_id = '.$stutable.'.student_id'.
1950: ' LEFT JOIN '.$groupnames_table.
1951: ' AS '.$grptable.' ON '.
1952: $stugrptab.'.group_id = '.$grptable.'.group_id ';
1953: $group_limits =
1954: ' ('.
1955: join(' OR ', map { "$grptable.groupname='".$_."'" } @$Groups
1956: ).')';
1957: }
1958: return ($groups_join,$group_limits);
1959: }
1960:
1961:
1962: sub RNK_student { return 0; };
1963: sub RNK_score { return 1; };
1964:
1965: sub rank_students_by_scores_on_resources {
1966: my ($resources,$Sections,$Groups,$enrollment,$courseid,$starttime,$endtime,
1967: $has_award_for) = @_;
1968: return if (! defined($resources) || ! ref($resources) eq 'ARRAY');
1969: if (! defined($courseid)) {
1970: $courseid = $env{'request.course.id'};
1971: }
1972: #
1973: &setup_table_names($courseid);
1974: my $dbh = &Apache::lonmysql::get_dbh();
1975: my ($section_limits,$enrollment_limits)=
1976: &limit_by_section_and_status($Sections,$enrollment,'b');
1977: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
1978: my $symb_limits = '('.join(' OR ',map {'a.symb_id='.&get_symb_id($_);
1979: } @$resources
1980: ).')';
1981: my ($award_col, $award_join, $award_clause) = ('', '', '');
1982: if ($has_award_for) {
1983: my $resource_id = &get_symb_id($has_award_for);
1984: $award_col = ", perf.awarded";
1985: $award_join = "LEFT JOIN $performance_table AS perf ON perf.symb_id"
1986: ." = $resource_id AND perf.student_id = b.student_id ";
1987: $award_clause = "AND perf.awarded IS NOT NULL";
1988: }
1989: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
1990: my $request = "SELECT b.student,SUM(a.awarded*w.weight) AS score "
1991: ."$award_col FROM $performance_table AS a ".
1992: "NATURAL LEFT JOIN $weight_table AS w ".
1993: "LEFT JOIN $student_table AS b ON a.student_id=b.student_id ".
1994: "$award_join $groups_join ";
1995: my $limits;
1996: if (defined($section_limits)) {
1997: $limits .= $section_limits.' AND ';
1998: }
1999: if (defined($enrollment_limits)) {
2000: $limits .= $enrollment_limits.' AND ';
2001: }
2002: if (defined($time_limits)) {
2003: $limits .= $time_limits.' AND ';
2004: }
2005: if ($symb_limits ne '()') {
2006: $limits .= $symb_limits.' AND ';
2007: }
2008: if (defined($group_limits)) {
2009: $limits .= $group_limits.' AND ';
2010: }
2011: if ($limits) {
2012: $limits =~ s/( AND )$//; # Remove extra conjunction
2013: $request .= "WHERE $limits";
2014: }
2015: $request .= " $award_clause GROUP BY a.student_id ORDER BY score, b.student";
2016: #&Apache::lonnet::logthis('request = '.$/.$request);
2017: my $sth = $dbh->prepare($request) or die "Can't prepare $request";
2018: $sth->execute();
2019: my $rows = $sth->fetchall_arrayref();
2020: return ($rows);
2021: }
2022:
2023: sub get_sum_of_scores {
2024: my ($symb,$part,$students,$courseid,$starttime,$endtime) = @_;
2025: if (! defined($courseid)) {
2026: $courseid = $env{'request.course.id'};
2027: }
2028: if (defined($students) &&
2029: ((@$students == 0) ||
2030: (@$students == 1 && (! defined($students->[0]) ||
2031: $students->[0] eq ''))
2032: )
2033: ){
2034: undef($students);
2035: }
2036: #
2037: &setup_table_names($courseid);
2038: my $dbh = &Apache::lonmysql::get_dbh();
2039: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
2040: my $request = 'SELECT SUM(a.awarded*w.weight),SUM(w.weight) FROM '.
2041: $performance_table.' AS a '.
2042: 'NATURAL LEFT JOIN '.$weight_table.' AS w ';
2043: $request .= 'WHERE a.symb_id='.&get_symb_id($symb).
2044: ' AND a.part_id='.&get_part_id($part);
2045: if (defined($time_limits)) {
2046: $request .= ' AND '.$time_limits;
2047: }
2048: if (defined($students)) {
2049: $request .= ' AND ('.
2050: join(' OR ',map {'a.student_id='.&get_student_id(split(':',$_));
2051: } @$students).
2052: ')';
2053: }
2054: my $sth = $dbh->prepare($request);
2055: $sth->execute();
2056: my $rows = $sth->fetchrow_arrayref();
2057: if ($dbh->err) {
2058: &Apache::lonnet::logthis('error 1 = '.$dbh->errstr());
2059: &Apache::lonnet::logthis('prepared then executed, fetchrow_arrayrefed'.
2060: $/.$request);
2061: return (undef,undef);
2062: }
2063: return ($rows->[0],$rows->[1]);
2064: }
2065:
2066:
2067: sub score_stats {
2068: my ($Sections,$Groups,$enrollment,$symbs,$starttime,$endtime,$courseid)=@_;
2069: if (! defined($courseid)) {
2070: $courseid = $env{'request.course.id'};
2071: }
2072: #
2073: &setup_table_names($courseid);
2074: my $dbh = &Apache::lonmysql::get_dbh();
2075: #
2076: my ($section_limits,$enrollment_limits)=
2077: &limit_by_section_and_status($Sections,$enrollment,'b');
2078: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
2079: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
2080: my @Symbids = map { &get_symb_id($_); } @{$symbs};
2081: #
2082: my $stats_table = &temp_table_name($courseid,'problem_stats');
2083: my $symb_restriction = join(' OR ',map {'a.symb_id='.$_;} @Symbids);
2084: my $request = 'DROP TABLE '.$stats_table;
2085: $dbh->do($request);
2086: $request =
2087: 'CREATE TEMPORARY TABLE '.$stats_table.' '.
2088: 'SELECT a.student_id,'.
2089: 'SUM(a.awarded*w.weight) AS score FROM '.
2090: $performance_table.' AS a '.
2091: 'NATURAL LEFT JOIN '.$weight_table.' AS w '.
2092: 'LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id '.
2093: $groups_join;
2094: my $limit = ' WHERE ('.$symb_restriction.')';
2095: if ($time_limits) {
2096: $limit .= ' AND '.$time_limits;
2097: }
2098: if ($section_limits) {
2099: $limit .= ' AND '.$section_limits;
2100: }
2101: if ($enrollment_limits) {
2102: $limit .= ' AND '.$enrollment_limits;
2103: }
2104: if ($group_limits) {
2105: $limit .= ' AND '.$group_limits;
2106: }
2107: $request .= $limit.' GROUP BY a.student_id';
2108: # &Apache::lonnet::logthis('request = '.$/.$request);
2109: my $sth = $dbh->prepare($request);
2110: $sth->execute();
2111: $request =
2112: 'SELECT AVG(score),STD(score),MAX(score),MIN(score),COUNT(score) '.
2113: 'FROM '.$stats_table;
2114: my ($ave,$std,$max,$min,$count) = &execute_SQL_request($dbh,$request);
2115: # &Apache::lonnet::logthis('request = '.$/.$request);
2116:
2117: $request = 'SELECT SUM(weight) FROM '.$weight_table.
2118: ' AS a WHERE ('.$symb_restriction.')';
2119: my ($max_possible) = &execute_SQL_request($dbh,$request);
2120: # &Apache::lonnet::logthis('request = '.$/.$request);
2121: return($min,$max,$ave,$std,$count,$max_possible);
2122: }
2123:
2124:
2125:
2126: sub count_stats {
2127: my ($Sections,$Groups,$enrollment,$symbs,$starttime,$endtime,$courseid)=@_;
2128: if (! defined($courseid)) {
2129: $courseid = $env{'request.course.id'};
2130: }
2131: #
2132: &setup_table_names($courseid);
2133: my $dbh = &Apache::lonmysql::get_dbh();
2134: #
2135: my ($section_limits,$enrollment_limits)=
2136: &limit_by_section_and_status($Sections,$enrollment,'b');
2137: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
2138: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
2139: my @Symbids = map { &get_symb_id($_); } @{$symbs};
2140: #
2141: my $stats_table = &temp_table_name($courseid,'problem_stats');
2142: my $symb_restriction = join(' OR ',map {'a.symb_id='.$_;} @Symbids);
2143: my $request = 'DROP TABLE '.$stats_table;
2144: $dbh->do($request);
2145: $request =
2146: 'CREATE TEMPORARY TABLE '.$stats_table.' '.
2147: 'SELECT a.student_id,'.
2148: 'SUM(a.awarded) AS count FROM '.
2149: $performance_table.' AS a '.
2150: 'LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id '.
2151: $groups_join;
2152: my $limit = ' WHERE ('.$symb_restriction.')';
2153: if ($time_limits) {
2154: $limit .= ' AND '.$time_limits;
2155: }
2156: if ($section_limits) {
2157: $limit .= ' AND '.$section_limits;
2158: }
2159: if ($enrollment_limits) {
2160: $limit .= ' AND '.$enrollment_limits;
2161: }
2162: if ($group_limits) {
2163: $limit .= ' AND '.$group_limits;
2164: }
2165: $request .= $limit.' GROUP BY a.student_id';
2166: # &Apache::lonnet::logthis('request = '.$/.$request);
2167: my $sth = $dbh->prepare($request);
2168: $sth->execute();
2169: $request =
2170: 'SELECT AVG(count),STD(count),MAX(count),MIN(count),COUNT(count) '.
2171: 'FROM '.$stats_table;
2172: my ($ave,$std,$max,$min,$count) = &execute_SQL_request($dbh,$request);
2173: # &Apache::lonnet::logthis('request = '.$/.$request);
2174: return($min,$max,$ave,$std,$count);
2175: }
2176:
2177:
2178: sub get_student_data {
2179: my ($students,$courseid) = @_;
2180: $courseid = $env{'request.course.id'} if (! defined($courseid));
2181: &setup_table_names($courseid);
2182: my $dbh = &Apache::lonmysql::get_dbh();
2183: return undef if (! defined($dbh));
2184: my $request = 'SELECT '.
2185: 'student_id, student '.
2186: 'FROM '.$student_table;
2187: if (defined($students)) {
2188: $request .= ' WHERE ('.
2189: join(' OR ', map {'student_id='.
2190: &get_student_id($_->{'username'},
2191: $_->{'domain'})
2192: } @$students
2193: ).')';
2194: }
2195: $request.= ' ORDER BY student_id';
2196: my $sth = $dbh->prepare($request);
2197: $sth->execute();
2198: if ($dbh->err) {
2199: &Apache::lonnet::logthis('error 2 = '.$dbh->errstr());
2200: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2201: return undef;
2202: }
2203: my $dataset = $sth->fetchall_arrayref();
2204: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2205: return $dataset;
2206: }
2207: }
2208:
2209: sub RD_student_id { return 0; }
2210: sub RD_awarddetail { return 1; }
2211: sub RD_response_eval { return 2; }
2212: sub RD_response_eval_2 { return 3; }
2213: sub RD_submission { return 4; }
2214: sub RD_timestamp { return 5; }
2215: sub RD_tries { return 6; }
2216: sub RD_sname { return 7; }
2217:
2218: sub get_response_data {
2219: my ($Sections,$Groups,$enrollment,$symb,$response,$courseid) = @_;
2220: return undef if (! defined($symb) ||
2221: ! defined($response));
2222: $courseid = $env{'request.course.id'} if (! defined($courseid));
2223: #
2224: &setup_table_names($courseid);
2225: my $symb_id = &get_symb_id($symb);
2226: if (! defined($symb_id)) {
2227: &Apache::lonnet::logthis('Unable to find symb for '.$symb.' in '.$courseid);
2228: return undef;
2229: }
2230: my $response_id = &get_part_id($response);
2231: if (! defined($response_id)) {
2232: &Apache::lonnet::logthis('Unable to find id for '.$response.' in '.$courseid);
2233: return undef;
2234: }
2235: #
2236: my $dbh = &Apache::lonmysql::get_dbh();
2237: return undef if (! defined($dbh));
2238: #
2239: my ($student_requirements,$enrollment_requirements) =
2240: &limit_by_section_and_status($Sections,$enrollment,'d');
2241: my ($groups_join,$group_limits) = &limit_by_group($Groups,'d','e','f');
2242: my $request = 'SELECT '.
2243: 'a.student_id, a.awarddetail, a.response_specific_value, '.
2244: 'a.response_specific_value_2, a.submission, b.timestamp, '.
2245: 'c.tries, d.student '.
2246: 'FROM '.$fulldump_response_table.' AS a '.
2247: 'LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
2248: 'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
2249: 'a.transaction = b.transaction '.
2250: 'LEFT JOIN '.$fulldump_part_table.' AS c '.
2251: 'ON a.symb_id=c.symb_id AND a.student_id=c.student_id AND '.
2252: 'a.part_id=c.part_id AND a.transaction = c.transaction '.
2253: 'LEFT JOIN '.$student_table.' AS d '.
2254: 'ON a.student_id=d.student_id '.
2255: $groups_join;
2256: my $limit = ' WHERE '.
2257: 'a.symb_id='.$symb_id.' AND a.response_id='.$response_id;
2258: if (defined($student_requirements)) {
2259: $limit .= ' AND '.$student_requirements;
2260: }
2261: if (defined($enrollment_requirements)) {
2262: $limit .= ' AND '.$enrollment_requirements;
2263: }
2264: if (defined($group_limits)) {
2265: $limit .= ' AND '.$group_limits;
2266: }
2267: $request .= $limit.' ORDER BY b.timestamp';
2268: # &Apache::lonnet::logthis("request =\n".$request);
2269: my $sth = $dbh->prepare($request);
2270: $sth->execute();
2271: if ($dbh->err) {
2272: &Apache::lonnet::logthis('error 3 = '.$dbh->errstr());
2273: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2274: return undef;
2275: }
2276: my $dataset = $sth->fetchall_arrayref();
2277: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2278: # Clear the \'s from around the submission
2279: for (my $i =0;$i<scalar(@$dataset);$i++) {
2280: $dataset->[$i]->[&RD_submission()] =~ s/(\'$|^\')//g;
2281: }
2282: return $dataset;
2283: }
2284: }
2285:
2286:
2287: sub RDs_awarddetail { return 3; }
2288: sub RDs_submission { return 2; }
2289: sub RDs_timestamp { return 1; }
2290: sub RDs_tries { return 0; }
2291: sub RDs_awarded { return 4; }
2292: sub RDs_response_eval { return 5; }
2293: sub RDs_response_eval_2 { return 6; }
2294: sub RDs_part_award { return 7; }
2295:
2296: sub get_response_data_by_student {
2297: my ($student,$symb,$response,$courseid) = @_;
2298: return undef if (! defined($symb) ||
2299: ! defined($response));
2300: $courseid = $env{'request.course.id'} if (! defined($courseid));
2301: #
2302: &setup_table_names($courseid);
2303: my $symb_id = &get_symb_id($symb);
2304: my $response_id = &get_part_id($response);
2305: #
2306: my $student_id = &get_student_id($student->{'username'},
2307: $student->{'domain'});
2308: #
2309: my $dbh = &Apache::lonmysql::get_dbh();
2310: return undef if (! defined($dbh));
2311: my $request = 'SELECT '.
2312: 'c.tries, b.timestamp, a.submission, a.awarddetail, c.awarded, '.
2313: 'a.response_specific_value, a.response_specific_value_2, c.award '.
2314: 'FROM '.$fulldump_response_table.' AS a '.
2315: 'LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
2316: 'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
2317: 'a.transaction = b.transaction '.
2318: 'LEFT JOIN '.$fulldump_part_table.' AS c '.
2319: 'ON a.symb_id=c.symb_id AND a.student_id=c.student_id AND '.
2320: 'a.part_id=c.part_id AND a.transaction = c.transaction '.
2321: 'LEFT JOIN '.$student_table.' AS d '.
2322: 'ON a.student_id=d.student_id '.
2323: 'LEFT JOIN '.$performance_table.' AS e '.
2324: 'ON a.symb_id=e.symb_id AND a.part_id=e.part_id AND '.
2325: 'a.student_id=e.student_id AND c.tries=e.tries '.
2326: 'WHERE '.
2327: 'a.symb_id='.$symb_id.' AND a.response_id='.$response_id.
2328: ' AND a.student_id='.$student_id.' ORDER BY b.timestamp';
2329: # &Apache::lonnet::logthis("request =\n".$request);
2330: my $sth = $dbh->prepare($request);
2331: $sth->execute();
2332: if ($dbh->err) {
2333: &Apache::lonnet::logthis('error 4 = '.$dbh->errstr());
2334: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2335: return undef;
2336: }
2337: my $dataset = $sth->fetchall_arrayref();
2338: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2339: # Clear the \'s from around the submission
2340: for (my $i =0;$i<scalar(@$dataset);$i++) {
2341: $dataset->[$i]->[&RDs_submission] =~ s/(\'$|^\')//g;
2342: }
2343: return $dataset;
2344: }
2345: return undef; # error occurred
2346: }
2347:
2348: sub RT_student_id { return 0; }
2349: sub RT_awarded { return 1; }
2350: sub RT_tries { return 2; }
2351: sub RT_timestamp { return 3; }
2352:
2353: sub get_response_time_data {
2354: my ($sections,$groups,$enrollment,$symb,$part,$courseid) = @_;
2355: return undef if (! defined($symb) ||
2356: ! defined($part));
2357: $courseid = $env{'request.course.id'} if (! defined($courseid));
2358: #
2359: &setup_table_names($courseid);
2360: my $symb_id = &get_symb_id($symb);
2361: if (! defined($symb_id)) {
2362: &Apache::lonnet::logthis('Unable to find symb for '.$symb.' in '.$courseid);
2363: return undef;
2364: }
2365: my $part_id = &get_part_id($part);
2366: if (! defined($part_id)) {
2367: &Apache::lonnet::logthis('Unable to find id for '.$part.' in '.$courseid);
2368: return undef;
2369: }
2370: #
2371: my $dbh = &Apache::lonmysql::get_dbh();
2372: return undef if (! defined($dbh));
2373: my ($student_requirements,$enrollment_requirements) =
2374: &limit_by_section_and_status($sections,$enrollment,'d');
2375: my ($groups_join,$group_limits) = &limit_by_group($groups,'d','e','f');
2376: my $request = 'SELECT '.
2377: 'a.student_id, a.awarded, a.tries, b.timestamp '.
2378: 'FROM '.$fulldump_part_table.' AS a '.
2379: 'LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
2380: 'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
2381: 'a.transaction = b.transaction '.
2382: 'LEFT JOIN '.$student_table.' as d '.
2383: 'ON a.student_id=d.student_id '.
2384: $groups_join;
2385: my $limit = ' WHERE '.
2386: 'a.symb_id='.$symb_id.' AND a.part_id='.$part_id;
2387: if (defined($student_requirements)) {
2388: $limit .= ' AND '.$student_requirements;
2389: }
2390: if (defined($enrollment_requirements)) {
2391: $limit .= ' AND '.$enrollment_requirements;
2392: }
2393: if (defined($group_limits)) {
2394: $limit .= ' AND '.$group_limits;
2395: }
2396: $request .= $limit.' ORDER BY b.timestamp';
2397: # &Apache::lonnet::logthis("request =\n".$request);
2398: my $sth = $dbh->prepare($request);
2399: $sth->execute();
2400: if ($dbh->err) {
2401: &Apache::lonnet::logthis('error 5 = '.$dbh->errstr());
2402: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2403: return undef;
2404: }
2405: my $dataset = $sth->fetchall_arrayref();
2406: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2407: return $dataset;
2408: }
2409:
2410: }
2411:
2412: sub get_student_scores {
2413: my ($sections,$groups,$Symbs,$enrollment,$courseid,$starttime,$endtime) = @_;
2414: $courseid = $env{'request.course.id'} if (! defined($courseid));
2415: &setup_table_names($courseid);
2416: my $dbh = &Apache::lonmysql::get_dbh();
2417: return (undef) if (! defined($dbh));
2418: my $tmptable = &temp_table_name($courseid,'temp_'.time);
2419: my $request = 'DROP TABLE IF EXISTS '.$tmptable;
2420: # &Apache::lonnet::logthis('request = '.$/.$request);
2421: $dbh->do($request);
2422: #
2423: my $symb_requirements;
2424: if (defined($Symbs) && @$Symbs) {
2425: $symb_requirements = '('.
2426: join(' OR ', map{ "(a.symb_id='".&get_symb_id($_->{'symb'}).
2427: "' AND a.part_id='".&get_part_id($_->{'part'}).
2428: "')"
2429: } @$Symbs).')';
2430: }
2431: #
2432: my ($student_requirements,$enrollment_requirements) =
2433: &limit_by_section_and_status($sections,$enrollment,'b');
2434: #
2435: my ($groups_join,$group_limits) = &limit_by_group($groups,'b','d','e');
2436: my $time_requirements = &limit_by_start_end_time($starttime,$endtime,'a');
2437: ##
2438: $request = 'CREATE TEMPORARY TABLE IF NOT EXISTS '.$tmptable.
2439: ' SELECT a.student_id,SUM(a.awarded*c.weight) AS score FROM '.
2440: $performance_table.' AS a ';
2441: $request .= "LEFT JOIN ".$weight_table.' AS c ON a.symb_id=c.symb_id AND a.part_id=c.part_id ';
2442: if (defined($student_requirements) || defined($enrollment_requirements)) {
2443: $request .= ' LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id ';
2444: }
2445: if (defined($groups_join)) {
2446: $request .= $groups_join;
2447: }
2448: if (defined($symb_requirements) ||
2449: defined($student_requirements) ||
2450: defined($enrollment_requirements) ||
2451: defined($group_limits) ) {
2452: $request .= ' WHERE ';
2453: }
2454: if (defined($symb_requirements)) {
2455: $request .= $symb_requirements.' AND ';
2456: }
2457: if (defined($student_requirements)) {
2458: $request .= $student_requirements.' AND ';
2459: }
2460: if (defined($enrollment_requirements)) {
2461: $request .= $enrollment_requirements.' AND ';
2462: }
2463: if (defined($time_requirements)) {
2464: $request .= $time_requirements.' AND ';
2465: }
2466: $request =~ s/ AND $//; # Strip of the trailing ' AND '.
2467: $request .= ' GROUP BY a.student_id';
2468: # &Apache::lonnet::logthis("request = \n".$request);
2469: my $sth = $dbh->prepare($request);
2470: $sth->execute();
2471: if ($dbh->err) {
2472: &Apache::lonnet::logthis('error 6 = '.$dbh->errstr());
2473: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2474: return undef;
2475: }
2476: $request = 'SELECT score,COUNT(*) FROM '.$tmptable.' GROUP BY score';
2477: # &Apache::lonnet::logthis("request = \n".$request);
2478: $sth = $dbh->prepare($request);
2479: $sth->execute();
2480: if ($dbh->err) {
2481: &Apache::lonnet::logthis('error 7 = '.$dbh->errstr());
2482: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2483: return undef;
2484: }
2485: my $dataset = $sth->fetchall_arrayref();
2486: return $dataset;
2487: }
2488:
2489:
2490:
2491: sub setup_table_names {
2492: my ($courseid) = @_;
2493: if (! defined($courseid)) {
2494: $courseid = $env{'request.course.id'};
2495: }
2496: #
2497: if (! defined($current_course) || $current_course ne $courseid) {
2498: # Clear out variables
2499: $have_read_part_table = 0;
2500: undef(%ids_by_part);
2501: undef(%parts_by_id);
2502: $have_read_symb_table = 0;
2503: undef(%ids_by_symb);
2504: undef(%symbs_by_id);
2505: $have_read_student_table = 0;
2506: undef(%ids_by_student);
2507: undef(%students_by_id);
2508: $have_read_groupnames_table = 0;
2509: undef(%ids_by_groupname);
2510: #
2511: $current_course = $courseid;
2512: }
2513: #
2514: # Set up database names
2515: my $base_id = 'md5_'.&Digest::MD5::md5_hex($courseid);
2516: $symb_table = $base_id.'_'.'symb';
2517: $part_table = $base_id.'_'.'part';
2518: $student_table = $base_id.'_'.'student';
2519: $groupnames_table = $base_id.'_'.'groupnames';
2520: $students_groups_table = $base_id.'_'.'studentgroups';
2521: $performance_table = $base_id.'_'.'performance';
2522: $parameters_table = $base_id.'_'.'parameters';
2523: $fulldump_part_table = $base_id.'_'.'partdata';
2524: $fulldump_response_table = $base_id.'_'.'responsedata';
2525: $fulldump_timestamp_table = $base_id.'_'.'timestampdata';
2526: $weight_table = $base_id.'_'.'weight';
2527: #
2528: @Tables = (
2529: $symb_table,
2530: $part_table,
2531: $student_table,
2532: $groupnames_table,
2533: $students_groups_table,
2534: $performance_table,
2535: $parameters_table,
2536: $fulldump_part_table,
2537: $fulldump_response_table,
2538: $fulldump_timestamp_table,
2539: $weight_table,
2540: );
2541: return;
2542: }
2543:
2544: sub temp_table_name {
2545: my ($courseid,$affix) = @_;
2546: my $base_id = 'md5_'.&Digest::MD5::md5_hex($courseid);
2547: return $base_id.'_'.$affix;
2548: }
2549:
2550:
2551: } # End scope of table identifiers
2552:
2553:
2554:
2555: sub CL_SDOM { return 0; }
2556: sub CL_SNAME { return 1; }
2557: sub CL_END { return 2; }
2558: sub CL_START { return 3; }
2559: sub CL_ID { return 4; }
2560: sub CL_SECTION { return 5; }
2561: sub CL_FULLNAME { return 6; }
2562: sub CL_STATUS { return 7; }
2563: sub CL_TYPE { return 8; }
2564: sub CL_LOCKEDTYPE { return 9; }
2565: sub CL_CREDITS { return 10; }
2566: sub CL_INSTSEC { return 11; }
2567: sub CL_GROUP { return 12; }
2568: sub CL_PERMANENTEMAIL { return 13; }
2569: sub CL_ROLE { return 14; }
2570: sub CL_EXTENT { return 15; }
2571: sub CL_PHOTO { return 16; }
2572: sub CL_THUMBNAIL { return 17; }
2573: sub CL_AUTHORQUOTA { return 18; }
2574: sub CL_AUTHORUSAGE { return 19; }
2575:
2576: sub get_classlist {
2577: my ($cdom,$cnum) = @_;
2578: my $cid = $cdom.'_'.$cnum;
2579: if (!defined($cdom) || !defined($cnum)) {
2580: $cid = $env{'request.course.id'};
2581: $cdom = $env{'course.'.$cid.'.domain'};
2582: $cnum = $env{'course.'.$cid.'.num'};
2583: }
2584: my $now = time;
2585: #
2586: my %classlist=&Apache::lonnet::dump('classlist',$cdom,$cnum);
2587: while (my ($student,$info) = each(%classlist)) {
2588: if ($student =~ /^(con_lost|error|no_such_host)/i) {
2589: &Apache::lonnet::logthis('get_classlist error for '.$cid.':'.$student);
2590: return undef;
2591: }
2592: my ($sname,$sdom) = split(/:/,$student);
2593: my @Values = split(/:/,$info);
2594: my ($end,$start,$id,$section,$fullname,$type,$lockedtype,$credits,$instsec);
2595: if (@Values > 2) {
2596: ($end,$start,$id,$section,$fullname,$type,$lockedtype,$credits,$instsec) = @Values;
2597: } else { # We have to get the data ourselves
2598: ($end,$start) = @Values;
2599: $section = &Apache::lonnet::getsection($sdom,$sname,$cid);
2600: my %info=&Apache::lonnet::get('environment',
2601: ['firstname','middlename',
2602: 'lastname','generation','id'],
2603: $sdom, $sname);
2604: my ($tmp) = keys(%info);
2605: if ($tmp =~/^(con_lost|error|no_such_host)/i) {
2606: $fullname = 'not available';
2607: $id = 'not available';
2608: &Apache::lonnet::logthis('unable to retrieve environment '.
2609: 'for '.$sname.':'.$sdom);
2610: } else {
2611: $fullname = &Apache::lonnet::format_name(@info{qw/firstname middlename lastname generation/},'lastname');
2612: $id = $info{'id'};
2613: }
2614: # Update the classlist with this students information
2615: if ($fullname ne 'not available') {
2616: my $enrolldata = join(':',$end,$start,$id,$section,$fullname);
2617: my $reply=&Apache::lonnet::cput('classlist',
2618: {$student => $enrolldata},
2619: $cdom,$cnum);
2620: if ($reply !~ /^(ok|delayed)/) {
2621: &Apache::lonnet::logthis('Unable to update classlist for '.
2622: 'student '.$sname.':'.$sdom.
2623: ' error:'.$reply);
2624: }
2625: }
2626: }
2627: my $status='Expired';
2628: if(((!$end) || $now < $end) && ((!$start) || ($now > $start))) {
2629: $status='Active';
2630: }
2631: if(($now < $start) && ((!$end) || $now < $end )) {
2632: $status='Future';
2633: }
2634: $classlist{$student} =
2635: [$sdom,$sname,$end,$start,$id,$section,$fullname,$status,$type,
2636: $lockedtype,$credits,$instsec];
2637: }
2638: if (wantarray()) {
2639: return (\%classlist,['domain','username','end','start','id',
2640: 'section','fullname','status','type',
2641: 'lockedtype','credits','instsec']);
2642: } else {
2643: return \%classlist;
2644: }
2645: }
2646:
2647: sub get_group_memberships {
2648: my ($classlist,$keylist,$cdom,$cnum) = @_;
2649:
2650: return ({},{}) if (!ref($classlist) || !ref($keylist));
2651:
2652: my $cid = $cdom.'_'.$cnum;
2653: if (!defined($cdom) || !defined($cnum)) {
2654: $cid = $env{'request.course.id'};
2655: $cdom = $env{'course.'.$cid.'.domain'};
2656: $cnum = $env{'course.'.$cid.'.num'};
2657: }
2658: my (%classgroups,%studentgroups);
2659: my $now = time;
2660: my $access_end = $env{'course.'.$cid.'.default_enrollment_end_date'};
2661: my %curr_groups =&Apache::longroup::coursegroups($cdom,$cnum);
2662: if (%curr_groups) {
2663: my $grpindex = &CL_GROUP();
2664: my %groupmemberhash =
2665: &Apache::lonnet::get_group_membership($cdom,$cnum);
2666: foreach my $student (keys(%{$classlist})) {
2667: %{$classgroups{$student}} = ();
2668: my $hasgroup = 0;
2669: foreach my $status ('previous','future','active','aftercourse') {
2670: %{$classgroups{$student}{$status}} = ();
2671: }
2672: foreach my $group (keys(%curr_groups)) {
2673: if (defined($groupmemberhash{$group.':'.$student})) {
2674: my ($end,$start) = split(/:/,$groupmemberhash{$group.':'.
2675: $student});
2676: if ($start == -1) {
2677: next;
2678: } else {
2679: $studentgroups{$group} ++;
2680: $hasgroup = 1;
2681: if ($end && $end < $now) {
2682: $classgroups{$student}{'previous'}{$group} =
2683: $groupmemberhash{$group.':'.$student};
2684: if ($classlist->{$student}[&CL_STATUS()] eq 'Expired') {
2685: if ($access_end && $access_end < $now) {
2686: if ($access_end - $end < 86400) {
2687: $classgroups{$student}{'aftercourse'}{$group} = $groupmemberhash{$group.':'.$student};
2688: }
2689: }
2690: }
2691: } elsif ($now > $start) {
2692: if (!$end || $end > $now) {
2693: $classgroups{$student}{'active'}{$group} =
2694: $groupmemberhash{$group.':'.$student};
2695: }
2696: } else {
2697: $classgroups{$student}{'future'}{$group} =
2698: $groupmemberhash{$group.':'.$student};
2699: }
2700: }
2701: }
2702: }
2703: if (!$hasgroup) {
2704: $studentgroups{'none'} ++;
2705: } else {
2706: $classlist->{$student}->[$grpindex] = join(',',
2707: sort(keys(%{$classgroups{$student}{'active'}})));
2708: }
2709: }
2710: }
2711: return (\%classgroups,\%studentgroups);
2712: }
2713:
2714: sub get_students_groups {
2715: my ($student,$enrollment_status,$classgroups) = @_;
2716: my @studentsgroups = ();
2717: if (ref($$classgroups{$student}{'active'}) eq 'HASH') {
2718: push(@studentsgroups,keys(%{$$classgroups{$student}{'active'}}));
2719: }
2720: if ($enrollment_status eq 'Any') {
2721: foreach my $status ('previous','future') {
2722: if (ref($$classgroups{$student}{$status}) eq 'HASH') {
2723: push(@studentsgroups,keys(%{$$classgroups{$student}{$status}}));
2724: }
2725: }
2726: } else {
2727: if (ref($$classgroups{$student}{'aftercourse'}) eq 'HASH') {
2728: push(@studentsgroups,keys(%{$$classgroups{$student}{'aftercourse'}}));
2729: }
2730: }
2731: return @studentsgroups;
2732: }
2733:
2734:
2735: # ----- END HELPER FUNCTIONS --------------------------------------------
2736:
2737: 1;
2738: __END__
2739:
2740:
2741: =pod
2742:
2743: =head1 NAME
2744:
2745: Apache::loncoursedata
2746:
2747: =head1 SYNOPSIS
2748:
2749: Set of functions that download and process student and course information.
2750:
2751: =head1 PACKAGES USED
2752:
2753: Apache::lonnet
2754: Apache::longroup
2755: Time::HiRes
2756: Apache::lonmysql
2757: LONCAPA
2758: Digest::MD5
2759:
2760: =head1 DOWNLOAD INFORMATION
2761:
2762: This section contains all the functions that get data from other servers
2763: and/or itself.
2764:
2765:
2766:
2767: =head1 LOCAL DATA CACHING SUBROUTINES
2768:
2769: The local caching is done using MySQL. There is no fall-back implementation
2770: if MySQL is not running.
2771:
2772: The programmers interface is to call &get_current_state() or some other
2773: primary interface subroutine (described below). The internals of this
2774: storage system are documented here.
2775:
2776: There are six tables used to store student performance data (the results of
2777: a dumpcurrent). Each of these tables is created in MySQL with a name of
2778: $courseid_*****, where ***** is 'symb', 'part', or whatever is appropriate
2779: for the table. The tables and their purposes are described below.
2780:
2781: Some notes before we get started.
2782:
2783: Each table must have a PRIMARY KEY, which is a column or set of columns which
2784: will serve to uniquely identify a row of data. NULL is not allowed!
2785:
2786: INDEXes work best on integer data.
2787:
2788: JOIN is used to combine data from many tables into one output.
2789:
2790: lonmysql.pm is used for some of the interface, specifically the table creation
2791: calls. The inserts are done in bulk by directly calling the database handler.
2792: The SELECT ... JOIN statement used to retrieve the data does not have an
2793: interface in lonmysql.pm and I shudder at the thought of writing one.
2794:
2795: =head2 Table Descriptions
2796:
2797: =over 4
2798:
2799: =head2 Tables used to store meta information
2800:
2801: The following tables hold data required to keep track of the current status
2802: of a students data in the tables or to look up the students data in the tables.
2803:
2804: =over 4
2805:
2806: =item C<$symb_table>
2807:
2808: The symb_table has two columns. The first is a 'symb_id' and the second
2809: is the text name for the 'symb' (limited to 64k). The 'symb_id' is generated
2810: automatically by MySQL so inserts should be done on this table with an
2811: empty first element. This table has its PRIMARY KEY on the 'symb_id'.
2812:
2813: =item C<$part_table>
2814:
2815: The part_table has two columns. The first is a 'part_id' and the second
2816: is the text name for the 'part' (limited to 100 characters). The 'part_id' is
2817: generated automatically by MySQL so inserts should be done on this table with
2818: an empty first element. This table has its PRIMARY KEY on the 'part' (100
2819: characters) and a KEY on 'part_id'.
2820:
2821: =item C<$student_table>
2822:
2823: The student_table has 7 columns. The first is a 'student_id' assigned by
2824: MySQL. The second is 'student' which is username:domain. The third through
2825: fifth are 'section', 'status' (enrollment status), and 'classification'
2826: (to be used in the future). The sixth and seventh ('updatetime' and
2827: 'fullupdatetime') contain the time of last update and full update of student
2828: data. This table has its PRIMARY KEY on the 'student_id' column and is indexed
2829: on 'student', 'section', and 'status'.
2830:
2831: =item C<$groupnames_table>
2832:
2833: The groupnames_table has 2 columns. The first is a 'group_id' assigned by
2834: MySQL. The second is 'groupname' which is the name of the group in the course.
2835:
2836: =item C<$students_groups_table>
2837:
2838: The students_groups_table has 2 columns. The first is the 'student_id', and the
2839: second is the 'group_id'. These two columns comprise the PRIMARY KEY for this
2840: table, as an individual student may be affiliated with more than one group at
2841: any time. This table is indexed on both student_id and group_id.
2842:
2843: =back
2844:
2845: =head2 Tables used to store current status data
2846:
2847: The following tables store data only about the students current status on
2848: a problem, meaning only the data related to the last attempt on a problem.
2849:
2850: =over 4
2851:
2852: =item C<$performance_table>
2853:
2854: The performance_table has 9 columns. The first three are 'symb_id',
2855: 'student_id', and 'part_id'. These comprise the PRIMARY KEY for this table
2856: and are directly related to the $symb_table, $student_table, and $part_table
2857: described above. MySQL does better indexing on numeric items than text,
2858: so we use these three "index tables". The remaining columns are
2859: 'solved', 'tries', 'awarded', 'award', 'awarddetail', and 'timestamp'.
2860: These are either the MySQL type TINYTEXT or various integers ('tries' and
2861: 'timestamp'). This table has KEYs of 'student_id' and 'symb_id'.
2862: For use of this table, see the functions described below.
2863:
2864: =item C<$parameters_table>
2865:
2866: The parameters_table holds the data that does not fit neatly into the
2867: performance_table. The parameters table has four columns: 'symb_id',
2868: 'student_id', 'parameter', and 'value'. 'symb_id', 'student_id', and
2869: 'parameter' comprise the PRIMARY KEY for this table. 'parameter' is
2870: limited to 255 characters. 'value' is limited to 64k characters.
2871:
2872: =back
2873:
2874: =head2 Tables used for storing historic data
2875:
2876: The following tables are used to store almost all of the transactions a student
2877: has made on a homework problem. See loncapa/docs/homework/datastorage for
2878: specific information about each of the parameters stored.
2879:
2880: =over 4
2881:
2882: =item C<$fulldump_response_table>
2883:
2884: The response table holds data (documented in loncapa/docs/homework/datastorage)
2885: associated with a particular response id which is stored when a student
2886: attempts a problem. The following are the columns of the table, in order:
2887: 'symb_id','part_id','response_id','student_id','transaction','tries',
2888: 'awarddetail', 'response_specific', 'response_specific_value',
2889: 'response_specific_2', 'response_specific_value_2', and 'submission
2890: (the text of the students submission). The primary key is based on the
2891: first five columns listed above.
2892:
2893: =item C<$fulldump_part_table()>
2894:
2895: The part table holds data (documented in loncapa/docs/homework/datastorage)
2896: associated with a particular part id which is stored when a student attempts
2897: a problem. The following are the columns of the table, in order:
2898: 'symb_id','part_id','student_id','transaction','tries','award','awarded',
2899: and 'previous'. The primary key is based on the first five columns listed
2900: above.
2901:
2902: =item C<$fulldump_timestamp_table()>
2903:
2904: The timestamp table holds the timestamps of the transactions which are
2905: stored in $fulldump_response_table and $fulldump_part_table. This data is
2906: about both the response and part data. Columns: 'symb_id','student_id',
2907: 'transaction', and 'timestamp'.
2908: The primary key is based on the first 3 columns.
2909:
2910: =item C<$weight_table()>
2911:
2912: The weight table holds the weight for the problems used in the class.
2913: Whereas the weight of a problem can vary by section and student the data
2914: here is applied to the class as a whole.
2915: Columns: 'symb_id','part_id','response_id','weight'.
2916:
2917: =back
2918:
2919:
2920: =head1 IMPORTANT SUBROUTINES
2921:
2922: Here is a brief overview of the subroutines which are likely to be of
2923: interest:
2924:
2925: =over 4
2926:
2927: =item C<&get_current_state()>
2928:
2929: programmers interface.
2930:
2931: =item C<&init_dbs()>
2932:
2933: table creation
2934:
2935: =item C<&update_student_data()>
2936:
2937: data storage calls
2938:
2939: =item C<&get_student_data_from_performance_cache()>
2940:
2941: data retrieval
2942:
2943: =back
2944:
2945: =head1 OTHER SUBROUTINES
2946:
2947: =over 4
2948:
2949: =item C<&make_into_hash($values)>
2950:
2951: Returns a reference to a hash as described by $values. $values is
2952: assumed to be the result of
2953: join(':',map {&escape($_)} %orighash);
2954:
2955: This is a helper function for get_current_state.
2956:
2957: =item C<&init_dbs()>
2958:
2959: Input: course id
2960:
2961: Output: 0 on success, positive integer on error
2962:
2963: This routine issues the calls to lonmysql to create the tables used to
2964: store student data.
2965:
2966: item C<&delete_caches()>
2967:
2968: This routine drops all the tables associated with a course from the
2969: MySQL database.
2970:
2971: Input: course id (optional, determined by environment if omitted)
2972:
2973: Returns: nothing
2974:
2975: =item C<&get_part_id()>
2976:
2977: Get the MySQL id of a problem part string.
2978:
2979: Input: $part
2980:
2981: Output: undef on error, integer $part_id on success.
2982:
2983: =item C<&get_part()>
2984:
2985: Get the string describing a part from the MySQL id of the problem part.
2986:
2987: Input: $part_id
2988:
2989: Output: undef on error, $part string on success.
2990:
2991: =item C<&get_symb_id()>
2992:
2993: Get the MySQL id of a symb.
2994:
2995: Input: $symb
2996:
2997: Output: undef on error, integer $symb_id on success.
2998:
2999: =item C<&get_symb()>
3000:
3001: Get the symb associated with a MySQL symb_id.
3002:
3003: Input: $symb_id
3004:
3005: Output: undef on error, $symb on success.
3006:
3007: =item C<&get_student_id()>
3008:
3009: Get the MySQL id of a student.
3010:
3011: Input: $sname, $dom
3012:
3013: Output: undef on error, integer $student_id on success.
3014:
3015: =item C<&get_student()>
3016:
3017: Get student username:domain associated with the MySQL student_id.
3018:
3019: Input: $student_id
3020:
3021: Output: undef on error, string $student (username:domain) on success.
3022:
3023: =item C<&clear_internal_caches()>
3024:
3025: Causes the internal caches used in get_student_id, get_student,
3026: get_symb_id, get_symb, get_part_id, and get_part to be undef'd.
3027:
3028: Needs to be called before the first operation with the MySQL database
3029: for a given Apache request.
3030:
3031: =item C<&update_full_student_data($sname,$sdom,$courseid)>
3032:
3033: Does a lonnet::dump on a student to populate the courses tables.
3034:
3035: Input: $sname, $sdom, $courseid
3036:
3037: Output: $returnstatus
3038:
3039: $returnstatus is a string describing any errors that occurred. 'okay' is the
3040: default.
3041:
3042: This subroutine loads a students data using lonnet::dump and inserts
3043: it into the MySQL database. The inserts are done on three tables,
3044: $fulldump_response_table, $fulldump_part_table, and $fulldump_timestamp_table.
3045: The INSERT calls are made directly by this subroutine, not through lonmysql
3046: because we do a 'bulk'insert which takes advantage of MySQLs non-SQL
3047: compliant INSERT command to insert multiple rows at a time.
3048: If anything has gone wrong during this process, $returnstatus is updated with
3049: a description of the error.
3050:
3051: Once the "fulldump" tables are updated, the tables used for chart and
3052: spreadsheet (which hold only the current state of the student on their
3053: homework, not historical data) are updated. If all updates have occurred
3054: successfully, $student_table is updated to reflect the time of the update.
3055:
3056: Notice we do not insert the data and immediately query it. This means it
3057: is possible for there to be data returned this first time that is not
3058: available the second time. CYA.
3059:
3060:
3061: =item C<&update_student_data()>
3062:
3063: Input: $sname, $sdom, $courseid
3064:
3065: Output: $returnstatus, \%student_data
3066:
3067: $returnstatus is a string describing any errors that occurred. 'okay' is the
3068: default.
3069: \%student_data is the data returned by a call to lonnet::currentdump.
3070:
3071: This subroutine loads a students data using lonnet::currentdump and inserts
3072: it into the MySQL database. The inserts are done on two tables,
3073: $performance_table and $parameters_table. $parameters_table holds the data
3074: that is not included in $performance_table. See the description of
3075: $performance_table elsewhere in this file. The INSERT calls are made
3076: directly by this subroutine, not through lonmysql because we do a 'bulk'
3077: insert which takes advantage of MySQLs non-SQL compliant INSERT command to
3078: insert multiple rows at a time. If anything has gone wrong during this
3079: process, $returnstatus is updated with a description of the error and
3080: \%student_data is returned.
3081:
3082: Notice we do not insert the data and immediately query it. This means it
3083: is possible for there to be data returned this first time that is not
3084: available the second time. CYA.
3085:
3086: =item &ensure_tables_are_set_up($courseid)
3087:
3088: Checks to be sure the MySQL tables for the given class are set up.
3089: If $courseid is omitted it will be obtained from the environment.
3090:
3091: Returns nothing on success and 'error' on failure
3092:
3093:
3094: =item C<&ensure_current_data()>
3095:
3096: Input: $sname, $sdom, $courseid
3097:
3098: Output: $status, $data
3099:
3100: This routine ensures the data for a given student is up to date.
3101: The $student_table is queried to determine the time of the last update.
3102: If the students data is out of date, &update_student_data() is called.
3103: The return values from the call to &update_student_data() are returned.
3104:
3105: =item C<&ensure_current_full_data($sname,$sdom,$courseid)>
3106:
3107: Input: $sname, $sdom, $courseid
3108:
3109: Output: $status
3110:
3111: This routine ensures the fulldata (the data from a lonnet::dump, not a
3112: lonnet::currentdump) for a given student is up to date.
3113: The $student_table is queried to determine the time of the last update.
3114: If the students fulldata is out of date, &update_full_student_data() is
3115: called.
3116:
3117: The return value from the call to &update_full_student_data() is returned.
3118:
3119: =item C<&get_student_data_from_performance_cache()>
3120:
3121: Input: $sname, $sdom, $symb, $courseid
3122:
3123: Output: hash reference containing the data for the given student.
3124: If $symb is undef, all the students data is returned.
3125:
3126: This routine is the heart of the local caching system. See the description
3127: of $performance_table, $symb_table, $student_table, and $part_table. The
3128: main task is building the MySQL request. The tables appear in the request
3129: in the order in which they should be parsed by MySQL. When searching
3130: on a student the $student_table is used to locate the 'student_id'. All
3131: rows in $performance_table which have a matching 'student_id' are returned,
3132: with data from $part_table and $symb_table which match the entries in
3133: $performance_table, 'part_id' and 'symb_id'. When searching on a symb,
3134: the $symb_table is processed first, with matching rows grabbed from
3135: $performance_table and filled in from $part_table and $student_table in
3136: that order.
3137:
3138: Running 'EXPLAIN ' on the 'SELECT' statements generated can be quite
3139: interesting, especially if you play with the order the tables are listed.
3140:
3141:
3142: =item C<&get_current_state()>
3143:
3144: Input: $sname,$sdom,$symb,$courseid
3145:
3146: Output: Described below
3147:
3148: Retrieve the current status of a students performance. $sname and
3149: $sdom are the only required parameters. If $symb is undef the results
3150: of an &Apache::lonnet::currentdump() will be returned.
3151: If $courseid is undef it will be retrieved from the environment.
3152:
3153: The return structure is based on &Apache::lonnet::currentdump. If
3154: $symb is unspecified, all the students data is returned in a hash of
3155: the form:
3156: (
3157: symb1 => { param1 => value1, param2 => value2 ... },
3158: symb2 => { param1 => value1, param2 => value2 ... },
3159: )
3160:
3161: If $symb is specified, a hash of
3162: (
3163: param1 => value1,
3164: param2 => value2,
3165: )
3166: is returned.
3167:
3168: If no data is found for $symb, or if the student has no performance data,
3169: an empty list is returned.
3170:
3171: =item C<&get_problem_statistics()>
3172:
3173: Gather data on a given problem. The database is assumed to be
3174: populated and all local caching variables are assumed to be set
3175: properly. This means you need to call &ensure_current_data for
3176: the students you are concerned with prior to calling this routine.
3177:
3178: Inputs: $Sections, Groups, $status, $symb, $part, $courseid, $starttime,
3179: $endtime
3180:
3181: =over 4
3182:
3183: =item $Sections Array ref containing section names for students.
3184: 'all' is allowed to be the first (and only) item in the array.
3185:
3186: =item $Groups Array ref containing group names for students.
3187: 'all' is allowed to be the first (and only) item in the array.
3188:
3189: =item $status String describing the status of students
3190:
3191: =item $symb is the symb for the problem.
3192:
3193: =item $part is the part id you need statistics for
3194:
3195: =item $courseid is the course id, of course!
3196:
3197: =item $starttime and $endtime are unix times which to use to limit
3198: the statistical data.
3199:
3200: =back
3201:
3202: Outputs: See the code for up to date information. A hash reference is
3203: returned. The hash has the following keys defined:
3204:
3205: =over 4
3206:
3207: =item * num_students
3208:
3209: The number of students attempting the problem
3210:
3211: =item tries
3212:
3213: The total number of tries for the students
3214:
3215: =item max_tries
3216:
3217: The maximum number of tries taken
3218:
3219: =item mean_tries
3220:
3221: The average number of tries
3222:
3223: =item num_solved T
3224:
3225: he number of students able to solve the problem
3226:
3227: =item num_override
3228:
3229: The number of students whose answer is 'correct_by_override'
3230:
3231: =item deg_of_diff
3232:
3233: The degree of difficulty of the problem
3234:
3235: =item std_tries
3236:
3237: The standard deviation of the number of tries
3238:
3239: =item skew_tries
3240:
3241: The skew of the number of tries
3242:
3243: =item per_wrong
3244:
3245: The number of students attempting the problem who were not
3246: able to answer it correctly.
3247:
3248: =back
3249:
3250: =item C<&populate_weight_table()>
3251:
3252: =item C<&limit_by_start_end_times()>
3253:
3254: Build SQL WHERE condition which limits the data collected by the start
3255: and end times provided
3256:
3257: Inputs: $starttime, $endtime, $table
3258:
3259: Returns: $time_limits
3260:
3261:
3262: =item C<&limit_by_section_and_status()C>
3263:
3264: Build SQL WHERE condition which limits the data collected by section and
3265: student status.
3266:
3267: Inputs: $Sections (array ref)
3268: $enrollment (string: 'any', 'expired', 'active')
3269: $tablename The name of the table that holds the student data
3270:
3271: Returns: $student_requirements,$enrollment_requirements
3272:
3273: =item C<&limit_by_group()>
3274:
3275: Build SQL LEFT JOIN statement to include students_groups and groupnames tables and SQL WHERE condition which limits the data collected by group.
3276:
3277: Inputs: $Groups (array ref)
3278: $stutable The name of the table which holds the student data.
3279: $grptable The name of the table which maps group_id to groupname.
3280: $stugrptab The name of the table which holds student group affiliations.
3281: Returns: $groups_join,$group_limits
3282: $groups_join JOIN part of SQL statement (to include group related tables)
3283: $group_limits SQL WHERE condition limiting to requested groups
3284:
3285: =item C<rank_students_by_scores_on_resources()>
3286:
3287: Inputs:
3288: $resources: array ref of hash ref. Each hash ref needs key 'symb'.
3289: $Sections: array ref of sections to include,
3290: $Groups: array ref of groups to include.
3291: $enrollment: string,
3292: $courseid (may be omitted)
3293: $starttime (may be omitted)
3294: $endtime (may be omitted)
3295: $has_award_for (may be omitted)
3296:
3297: Returns; An array of arrays. The sub arrays contain a student name and
3298: their score on the resources. $starttime and $endtime constrain the
3299: list to awards obtained during the given time limits. $has_score_on
3300: constrains the list to those students who at least attempted the
3301: resource identified by the given symb, which is used to filter out
3302: such students for statistics that would be adversely affected by such
3303: students.
3304:
3305: =item C<&get_sum_of_scores>
3306:
3307: Inputs: $resource (hash ref, needs {'symb'} key),
3308: $part, (the part id),
3309: $students (array ref, contents of array are scalars holding 'sname:sdom'),
3310: $courseid
3311:
3312: Returns: the sum of the score on the problem part over the students and the
3313: maximum possible value for the sum (taken from the weight table).
3314:
3315:
3316: =item C<&score_stats()>
3317:
3318: Inputs: $Sections, $enrollment, $symbs, $starttime,
3319: $endtime, $courseid
3320:
3321: $Sections, $enrollment, $starttime, $endtime, and $courseid are the same as
3322: elsewhere in this module.
3323: $symbs is an array ref of symbs
3324:
3325: Returns: minimum, maximum, mean, s.d., number of students, and maximum
3326: possible of student scores on the given resources
3327:
3328: =item C<&count_stats()>
3329:
3330: Inputs: $Sections, $Groups, $enrollment, $symbs, $starttime,
3331: $endtime, $courseid
3332:
3333: $Sections, $Groups $enrollment, $starttime, $endtime, and $courseid are the
3334: same as elsewhere in this module.
3335: $symbs is an array ref of symbs
3336:
3337: Returns: minimum, maximum, mean, s.d., and number of students
3338: of the number of items correct on the given resources
3339:
3340: =item C<get_student_data()>
3341:
3342: =item C<&get_student_scores($Sections,$Groups,$Symbs,$enrollment,$courseid)>
3343:
3344: =item C<&setup_table_names()>
3345:
3346: input: course id
3347:
3348: output: none
3349:
3350: =back
3351:
3352: =head3 End of Local Data Caching Subroutines
3353:
3354: =head3 Classlist Subroutines
3355:
3356: =over
3357:
3358: =item &get_classlist();
3359:
3360: Retrieve the classist of a given class or of the current class. Student
3361: information is returned from the classlist.db file and, if needed,
3362: from the students environment.
3363:
3364: Optional arguments are $cdom, and $cnum (course domain,
3365: and course number, respectively). If either is ommitted the course
3366: will be taken from the current environment ($env{'request.course.id'},
3367: $env{'course.'.$cid.'.domain'}, and $env{'course.'.$cid.'.num'}).
3368:
3369: Returns a reference to a hash which contains:
3370: keys '$sname:$sdom'
3371: values [$sdom,$sname,$end,$start,$id,$section,$fullname,$status,$type,
3372: $lockedtype,$credits,$instsec]
3373:
3374: The constant values CL_SDOM, CL_SNAME, CL_END, etc. can be used
3375: as indices into the returned list to future-proof clients against
3376: changes in the list order.
3377:
3378: =back
3379:
3380: =cut
3381:
3382:
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