1: # The LearningOnline Network with CAPA
2: #
3: # $Id: loncoursedata.pm,v 1.205 2021/03/02 19:51:02 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("Skipping this item. You may want to increase the max_allowed_packet size from the current: $max_allowed_packet");
1154: next;
1155: } else {
1156: if ($length + $curr_params_length > $max_param) {
1157: push(@store_parameters_values,$curr_params_values);
1158: $curr_params_values = $sql_parameter;
1159: $curr_params_length = $length;
1160: } else {
1161: $curr_params_values .= $sql_parameter;
1162: $curr_params_length += $length;
1163: }
1164: }
1165: } else {
1166: $curr_params_values .= $sql_parameter;
1167: }
1168: #$rows_stored++;
1169: $num_parameters ++;
1170: }
1171: }
1172: }
1173: # Performance
1174: my %stored;
1175: while (my ($parameter,$value) = each(%$param_hash)) {
1176: next if ($parameter !~ /^resource\.(.*)\.(solved|awarded)$/);
1177: my $part = $1;
1178: my $which = $2;
1179: next if ($part =~ /\./);
1180: next if (exists($stored{$part}));
1181: $stored{$part}++;
1182: #
1183: my $part_id = &get_part_id($part);
1184: next if (!defined($part_id));
1185:
1186: my ($solved,$awarded);
1187: if ($which eq 'solved') {
1188: $solved = $value;
1189: $awarded = $param_hash->{'resource.'.$part.'.awarded'};
1190: } else {
1191: $solved = $param_hash->{'resource.'.$part.'.solved'};
1192: $awarded = $value;
1193: }
1194: my $award = $param_hash->{'resource.'.$part.'.award'};
1195: my $awarddetail = $param_hash->{'resource.'.$part.'.awarddetail'};
1196: my $timestamp = $param_hash->{'timestamp'};
1197: my $tries = $param_hash->{'resource.'.$part.'.tries'};
1198: if (&symb_is_for_task($current_symb)) {
1199: $tries = $param_hash->{'resource.'.$part.'.version'};
1200: }
1201: #
1202: $solved = '' if (! defined($solved));
1203: $tries = '' if (! defined($tries));
1204: $awarded = '' if (! defined($awarded));
1205: $award = '' if (! defined($award));
1206: $awarddetail = '' if (! defined($awarddetail));
1207: my $sql_performance =
1208: "('".join("','",$symb_id,$student_id,$part_id,$part,
1209: $solved,$tries,$awarded,$award,
1210: $awarddetail,$timestamp)."'),\n";
1211: if ($max_perf) {
1212: my $length = length($sql_performance);
1213: if ($length > $max_perf) {
1214: &Apache::lonnet::logthis("SQL performance insert for student: $sname would exceed max_allowed_packet size");
1215: &Apache::lonnet::logthis("symb_id: $symb_id");
1216: &Apache::lonnet::logthis("Skipping this item. You may want to increase the max_allowed_packet size from the current: $max_allowed_packet");
1217: next;
1218: } else {
1219: if ($length + $curr_perf_length > $max_perf) {
1220: push(@store_performance_values,$curr_perf_values);
1221: $curr_perf_values = $sql_performance;
1222: $curr_perf_length = $length;
1223: } else {
1224: $curr_perf_values .= $sql_performance;
1225: $curr_perf_length += $length;
1226: }
1227: }
1228: } else {
1229: $curr_perf_values .= $sql_performance;
1230: }
1231: $rows_stored++;
1232: }
1233: }
1234: if ($curr_params_values ne '') {
1235: push(@store_parameters_values,$curr_params_values);
1236: }
1237: if ($curr_perf_values ne '') {
1238: push(@store_performance_values,$curr_perf_values);
1239: }
1240: if (! $rows_stored) { return ($returnstatus, undef); }
1241: my $start = Time::HiRes::time;
1242: foreach my $item (@store_performance_values) {
1243: $item =~ s|,\n$||;
1244: if ($item ne '') {
1245: $dbh->do($store_performance_prefix.$item);
1246: if ($dbh->err()) {
1247: &Apache::lonnet::logthis('performance insert error:'.
1248: $dbh->errstr());
1249: &Apache::lonnet::logthis('command = '.$/.$store_performance_prefix.$item);
1250: $returnstatus = 'error: unable to insert performance into database';
1251: return ($returnstatus,$student_data);
1252: }
1253: }
1254: }
1255: if ($num_parameters > 0) {
1256: foreach my $item (@store_parameters_values) {
1257: $item =~ s|,\n$||;
1258: if ($item ne '') {
1259: $dbh->do($store_parameters_prefix.$item);
1260: if ($dbh->err()) {
1261: &Apache::lonnet::logthis('parameters insert error:'.
1262: $dbh->errstr());
1263: &Apache::lonnet::logthis('command = '.$/.$store_parameters_prefix.$item);
1264: &Apache::lonnet::logthis('rows_stored = '.$rows_stored);
1265: &Apache::lonnet::logthis('student_id = '.$student_id);
1266: $returnstatus = 'error: unable to insert parameters into database';
1267: return ($returnstatus,$student_data);
1268: }
1269: }
1270: }
1271: }
1272: $elapsed += Time::HiRes::time - $start;
1273: return ($returnstatus,$student_data);
1274: }
1275:
1276:
1277: sub ensure_tables_are_set_up {
1278: my ($courseid) = @_;
1279: $courseid = $env{'request.course.id'} if (! defined($courseid));
1280: #
1281: # Clean out package variables
1282: &setup_table_names($courseid);
1283: #
1284: # if the tables do not exist, make them
1285: my @CurrentTable = &Apache::lonmysql::tables_in_db();
1286: my ($found_symb,$found_student,$found_groups,$found_groupnames,$found_part,
1287: $found_performance,$found_parameters,$found_fulldump_part,
1288: $found_fulldump_response,$found_fulldump_timestamp,
1289: $found_weight);
1290: foreach (@CurrentTable) {
1291: $found_symb = 1 if ($_ eq $symb_table);
1292: $found_student = 1 if ($_ eq $student_table);
1293: $found_groups = 1 if ($_ eq $students_groups_table);
1294: $found_groupnames = 1 if ($_ eq $groupnames_table);
1295: $found_part = 1 if ($_ eq $part_table);
1296: $found_performance = 1 if ($_ eq $performance_table);
1297: $found_parameters = 1 if ($_ eq $parameters_table);
1298: $found_fulldump_part = 1 if ($_ eq $fulldump_part_table);
1299: $found_fulldump_response = 1 if ($_ eq $fulldump_response_table);
1300: $found_fulldump_timestamp = 1 if ($_ eq $fulldump_timestamp_table);
1301: $found_weight = 1 if ($_ eq $weight_table);
1302: }
1303: if (!$found_symb ||
1304: !$found_student || !$found_part ||
1305: !$found_performance || !$found_parameters ||
1306: !$found_fulldump_part || !$found_fulldump_response ||
1307: !$found_fulldump_timestamp || !$found_weight ) {
1308: if (&init_dbs($courseid,1)) {
1309: return 'error';
1310: }
1311: }
1312: }
1313:
1314: sub ensure_current_data {
1315: my ($sname,$sdom,$courseid) = @_;
1316: my $status = 'okay'; # return value
1317: #
1318: $courseid = $env{'request.course.id'} if (! defined($courseid));
1319: &ensure_tables_are_set_up($courseid);
1320: #
1321: # Get the update time for the user
1322: my $updatetime = 0;
1323: my $getuserdir = 1;
1324: my $modifiedtime = &Apache::lonnet::GetFileTimestamp
1325: ($sdom,$sname,$courseid.'.db',$getuserdir);
1326: #
1327: if ($modifiedtime == -1) {
1328: return ('no data',undef);
1329: }
1330:
1331: my $student_id = &get_student_id($sname,$sdom);
1332: &get_students_groupids($student_id);
1333: my @Result = &Apache::lonmysql::get_rows($student_table,
1334: "student_id ='$student_id'");
1335: my $data = undef;
1336: if (@Result) {
1337: $updatetime = $Result[0]->[6]; # Ack! This is dumb!
1338: }
1339: if ($modifiedtime > $updatetime) {
1340: ($status,$data) = &update_student_data($sname,$sdom,$courseid);
1341: }
1342: return ($status,$data);
1343: }
1344:
1345:
1346: sub ensure_current_full_data {
1347: my ($sname,$sdom,$courseid) = @_;
1348: my $status = 'okay'; # return value
1349: #
1350: $courseid = $env{'request.course.id'} if (! defined($courseid));
1351: &ensure_tables_are_set_up($courseid);
1352: #
1353: # Get the update time for the user
1354: my $getuserdir = 1;
1355: my $modifiedtime = &Apache::lonnet::GetFileTimestamp
1356: ($sdom,$sname,$courseid.'.db',$getuserdir);
1357: #
1358: my $student_id = &get_student_id($sname,$sdom);
1359: &get_students_groupids($student_id);
1360: my @Result = &Apache::lonmysql::get_rows($student_table,
1361: "student_id ='$student_id'");
1362: my $updatetime;
1363: if (@Result && ref($Result[0]) eq 'ARRAY') {
1364: $updatetime = $Result[0]->[7];
1365: }
1366: if (! defined($updatetime) || $modifiedtime > $updatetime) {
1367: $status = &update_full_student_data($sname,$sdom,$courseid);
1368: }
1369: return $status;
1370: }
1371:
1372: sub ensure_current_groups {
1373: my ($courseid) = @_;
1374: my ($cdom,$cnum);
1375: if (defined($courseid)) {
1376: my %coursehash = &Apache::lonnet::coursedescription($courseid);
1377: $cdom = $coursehash{'domain'};
1378: $cnum = $coursehash{'num'};
1379: } elsif ($env{'request.course.id'}) {
1380: $courseid = $env{'request.course.id'};
1381: $cdom = $env{'course.'.$courseid.'.domain'};
1382: $cnum = $env{'course.'.$courseid.'.num'};
1383: }
1384: if ($cdom eq '' || $cnum eq '') {
1385: return 'error: invalid course';
1386: }
1387: &setup_table_names($courseid);
1388: my @CurrentTables = &Apache::lonmysql::tables_in_db();
1389: unless (grep(/^\Q$groupnames_table\E$/,@CurrentTables)) {
1390: return;
1391: }
1392: # Get the update time for the groupnames table
1393: my $getuserdir = 1;
1394: my $modifiedtime = &Apache::lonnet::GetFileTimestamp
1395: ($cdom,$cnum,'coursegroups.db',$getuserdir);
1396: my %tableinfo = &Apache::lonmysql::table_information($groupnames_table);
1397: my $updatetime;
1398: if ($tableinfo{'Update_time'}) {
1399: $updatetime = $tableinfo{'Update_time'};
1400: }
1401: if (! defined($updatetime) || $modifiedtime > $updatetime) {
1402: my (%groups_in_sql,%removegroups,$addgroup);
1403: my %curr_groups = &Apache::longroup::coursegroups($cdom,$cnum);
1404: my @Result = &Apache::lonmysql::get_rows($groupnames_table);
1405: foreach my $row (@Result) {
1406: my ($id,$name) = @{$row};
1407: unless (exists($curr_groups{$name})) {
1408: $groups_in_sql{$name}=$id;
1409: } elsif ($id) {
1410: $removegroups{$id} = $name;
1411: }
1412: }
1413: foreach my $group (keys(%curr_groups)) {
1414: unless (exists($groups_in_sql{$group})) {
1415: $addgroup = 1;
1416: last;
1417: }
1418: }
1419: if (keys(%removegroups)) {
1420: my $dbh = &Apache::lonmysql::get_dbh();
1421: foreach my $group_id (keys(%removegroups)) {
1422: my $command = 'DELETE FROM '.$groupnames_table.' WHERE group_id='.
1423: $group_id;
1424: $dbh->do($command);
1425: if ($dbh->err()) {
1426: &Apache::lonnet::logthis("error ".$dbh->errstr().
1427: " occurred executing \n".
1428: "SQL command: $command");
1429: }
1430: }
1431: }
1432: if ($addgroup) {
1433: &populate_groupnames_table($courseid);
1434: }
1435: }
1436: return;
1437: }
1438:
1439: sub ensure_current_students_groups {
1440: my ($courseid) = @_;
1441: my ($cdom,$cnum);
1442: if (defined($courseid)) {
1443: my %coursehash = &Apache::lonnet::coursedescription($courseid);
1444: $cdom = $coursehash{'domain'};
1445: $cnum = $coursehash{'num'};
1446: } elsif ($env{'request.course.id'}) {
1447: $courseid = $env{'request.course.id'};
1448: $cdom = $env{'course.'.$courseid.'.domain'};
1449: $cnum = $env{'course.'.$courseid.'.num'};
1450: }
1451: &setup_table_names($courseid);
1452: my @CurrentTables = &Apache::lonmysql::tables_in_db();
1453: unless (grep(/^\Q$students_groups_table\E$/,@CurrentTables)) {
1454: return;
1455: }
1456: # Get the update time for the groupnames table
1457: my $getuserdir = 1;
1458: my $modifiedtime = &Apache::lonnet::GetFileTimestamp
1459: ($cdom,$cnum,'groupmembership.db',$getuserdir);
1460: my %tableinfo = &Apache::lonmysql::table_information($students_groups_table);
1461: my $updatetime;
1462: if ($tableinfo{'Update_time'}) {
1463: $updatetime = $tableinfo{'Update_time'};
1464: }
1465: if ((!defined($updatetime)) || ($modifiedtime > $updatetime)) {
1466: if (&Apache::lonmysql::drop_table($students_groups_table)) {
1467: if (&init_dbs($courseid)) {
1468: return "error creating $students_groups_table\n";
1469: } else {
1470: &populate_students_groups_table($courseid);
1471: }
1472: }
1473: }
1474: return;
1475: }
1476:
1477: sub ensure_current_sections {
1478: my ($courseid) = @_;
1479: my ($cdom,$cnum);
1480: if (defined($courseid)) {
1481: my %coursehash = &Apache::lonnet::coursedescription($courseid);
1482: $cdom = $coursehash{'domain'};
1483: $cnum = $coursehash{'num'};
1484: } elsif ($env{'request.course.id'}) {
1485: $courseid = $env{'request.course.id'};
1486: $cdom = $env{'course.'.$courseid.'.domain'};
1487: $cnum = $env{'course.'.$courseid.'.num'};
1488: }
1489: &setup_table_names($courseid);
1490: my @CurrentTables = &Apache::lonmysql::tables_in_db();
1491: unless (grep(/^\Q$student_table\E$/,@CurrentTables)) {
1492: return;
1493: }
1494: # Get the update time for the student table
1495: my $getuserdir = 1;
1496: my $modifiedtime = &Apache::lonnet::GetFileTimestamp
1497: ($cdom,$cnum,'classlist.db',$getuserdir);
1498: my %tableinfo = &Apache::lonmysql::table_information($student_table);
1499: my $updatetime;
1500: if ($tableinfo{'Update_time'}) {
1501: $updatetime = $tableinfo{'Update_time'};
1502: }
1503: if ((!defined($updatetime)) || ($modifiedtime > $updatetime)) {
1504: &update_student_table($cdom,$cnum);
1505: }
1506: return;
1507: }
1508:
1509: sub update_student_table {
1510: my ($cdom,$cnum) = @_;
1511: return unless (($cdom ne '') && ($cnum ne ''));
1512: my (%roster,%sqldata);
1513: my $classlist = &get_classlist($cdom,$cnum);
1514: while (my ($student,$data) = each (%$classlist)) {
1515: my ($section,$start,$end) = ($data->[&CL_SECTION()],
1516: $data->[&CL_START()],
1517: $data->[&CL_END()]);
1518: if ($section eq '' || $section =~ /^\s*$/) {
1519: $section = 'none';
1520: }
1521: if ($start eq '') { $start = 0; }
1522: if ($end eq '') { $end = 0; }
1523: $roster{$student}{'section'} = $section;
1524: $roster{$student}{'start'} = $start;
1525: $roster{$student}{'end'} = $end;
1526: }
1527: my $dbh = &Apache::lonmysql::get_dbh();
1528: my $statement = "SELECT student_id,student,section,start,end FROM $student_table";
1529: my $sth = $dbh->prepare($statement);
1530: $sth->execute();
1531: if ($sth->err()) {
1532: &Apache::lonnet::logthis("Unable to execute MySQL request:");
1533: &Apache::lonnet::logthis("\n".$statement."\n");
1534: &Apache::lonnet::logthis("error is:".$sth->errstr());
1535: return undef;
1536: }
1537: foreach my $row (@{$sth->fetchall_arrayref}) {
1538: my ($id,$student,$section,$start,$end) = (@$row);
1539: if (ref($roster{$student}) eq 'HASH') {
1540: if (($roster{$student}{'section'} ne $section) ||
1541: ($roster{$student}{'start'} ne $start) ||
1542: ($roster{$student}{'end'} ne $end)) {
1543: $sqldata{$id} = {
1544: section => $roster{$student}{'section'},
1545: start => $roster{$student}{'start'},
1546: end => $roster{$student}{'end'},
1547: };
1548: }
1549: }
1550: }
1551: $sth->finish();
1552: if (keys(%sqldata)) {
1553: foreach my $id (sort { $a <=> $b } keys(%sqldata)) {
1554: my $request = "UPDATE $student_table SET section='$sqldata{$id}{section}'".
1555: ", start='$sqldata{$id}{start}'".
1556: ", end='$sqldata{$id}{end}' WHERE student_id='$id'";
1557: $dbh->do($request);
1558: }
1559: }
1560: return;
1561: }
1562:
1563: sub get_student_data_from_performance_cache {
1564: my ($sname,$sdom,$symb,$courseid)=@_;
1565: my $student = $sname.':'.$sdom if (defined($sname) && defined($sdom));
1566: &setup_table_names($courseid);
1567: #
1568: # Return hash
1569: my $studentdata;
1570: #
1571: my $dbh = &Apache::lonmysql::get_dbh();
1572: my $request = "SELECT ".
1573: "d.symb,a.part,a.solved,a.tries,a.awarded,a.award,a.awarddetail,".
1574: "a.timestamp ";
1575: if (defined($student)) {
1576: $request .= "FROM $student_table AS b ".
1577: "LEFT JOIN $performance_table AS a ON b.student_id=a.student_id ".
1578: # "LEFT JOIN $part_table AS c ON c.part_id = a.part_id ".
1579: "LEFT JOIN $symb_table AS d ON d.symb_id = a.symb_id ".
1580: "WHERE student='$student'";
1581: if (defined($symb) && $symb ne '') {
1582: $request .= " AND d.symb=".$dbh->quote($symb);
1583: }
1584: } elsif (defined($symb) && $symb ne '') {
1585: $request .= "FROM $symb_table as d ".
1586: "LEFT JOIN $performance_table AS a ON d.symb_id=a.symb_id ".
1587: # "LEFT JOIN $part_table AS c ON c.part_id = a.part_id ".
1588: "LEFT JOIN $student_table AS b ON b.student_id = a.student_id ".
1589: "WHERE symb='".$dbh->quote($symb)."'";
1590: }
1591: my $starttime = Time::HiRes::time;
1592: my $rows_retrieved = 0;
1593: my $sth = $dbh->prepare($request);
1594: $sth->execute();
1595: if ($sth->err()) {
1596: &Apache::lonnet::logthis("Unable to execute MySQL request:");
1597: &Apache::lonnet::logthis("\n".$request."\n");
1598: &Apache::lonnet::logthis("error is:".$sth->errstr());
1599: return undef;
1600: }
1601: foreach my $row (@{$sth->fetchall_arrayref}) {
1602: $rows_retrieved++;
1603: my ($symb,$part,$solved,$tries,$awarded,$award,$awarddetail,$time) =
1604: (@$row);
1605: my $base = 'resource.'.$part;
1606: $studentdata->{$symb}->{$base.'.solved'} = $solved;
1607: $studentdata->{$symb}->{$base.'.tries'} = $tries;
1608: $studentdata->{$symb}->{$base.'.awarded'} = $awarded;
1609: $studentdata->{$symb}->{$base.'.award'} = $award;
1610: $studentdata->{$symb}->{$base.'.awarddetail'} = $awarddetail;
1611: $studentdata->{$symb}->{'timestamp'} = $time if (defined($time) && $time ne '');
1612: }
1613: ## Get misc parameters
1614: $request = 'SELECT c.symb,a.parameter,a.value '.
1615: "FROM $student_table AS b ".
1616: "LEFT JOIN $parameters_table AS a ON b.student_id=a.student_id ".
1617: "LEFT JOIN $symb_table AS c ON c.symb_id = a.symb_id ".
1618: "WHERE student='$student'";
1619: if (defined($symb) && $symb ne '') {
1620: $request .= " AND c.symb=".$dbh->quote($symb);
1621: }
1622: $sth = $dbh->prepare($request);
1623: $sth->execute();
1624: if ($sth->err()) {
1625: &Apache::lonnet::logthis("Unable to execute MySQL request:");
1626: &Apache::lonnet::logthis("\n".$request."\n");
1627: &Apache::lonnet::logthis("error is:".$sth->errstr());
1628: if (defined($symb) && $symb ne '') {
1629: $studentdata = $studentdata->{$symb};
1630: }
1631: return $studentdata;
1632: }
1633: #
1634: foreach my $row (@{$sth->fetchall_arrayref}) {
1635: $rows_retrieved++;
1636: my ($symb,$parameter,$value) = (@$row);
1637: $studentdata->{$symb}->{$parameter} = $value;
1638: }
1639: #
1640: if (defined($symb) && $symb ne '') {
1641: $studentdata = $studentdata->{$symb};
1642: }
1643: return $studentdata;
1644: }
1645:
1646:
1647: sub get_current_state {
1648: my ($sname,$sdom,$symb,$courseid,$forcedownload)=@_;
1649: #
1650: $courseid = $env{'request.course.id'} if (! defined($courseid));
1651: #
1652: return () if (! defined($sname) || ! defined($sdom));
1653: #
1654: my ($status,$data) = &ensure_current_data($sname,$sdom,$courseid);
1655: # &Apache::lonnet::logthis
1656: # ('sname = '.$sname.
1657: # ' domain = '.$sdom.
1658: # ' status = '.$status.
1659: # ' data is '.(defined($data)?'defined':'undefined'));
1660: # while (my ($symb,$hash) = each(%$data)) {
1661: # &Apache::lonnet::logthis($symb."\n----------------------------------");
1662: # while (my ($key,$value) = each (%$hash)) {
1663: # &Apache::lonnet::logthis(" ".$key." = ".$value);
1664: # }
1665: # }
1666: #
1667: if (defined($data) && defined($symb) && ref($data->{$symb})) {
1668: return %{$data->{$symb}};
1669: } elsif (defined($data) && ! defined($symb) && ref($data)) {
1670: return %$data;
1671: }
1672: if ($status eq 'no data') {
1673: return ();
1674: } else {
1675: if ($status ne 'okay' && $status ne '') {
1676: &Apache::lonnet::logthis('status = '.$status);
1677: return ('error: '.$status,undef);
1678: }
1679: my $returnhash = &get_student_data_from_performance_cache($sname,$sdom,
1680: $symb,$courseid);
1681: return %$returnhash if (defined($returnhash));
1682: }
1683: return ();
1684: }
1685:
1686:
1687: sub get_problem_statistics {
1688: my ($Sections,$Groups,$status,$symb,$part,$courseid,$starttime,$endtime) = @_;
1689: return if (! defined($symb) || ! defined($part));
1690: $courseid = $env{'request.course.id'} if (! defined($courseid));
1691: #
1692: &setup_table_names($courseid);
1693: my $symb_id = &get_symb_id($symb);
1694: my $part_id = &get_part_id($part);
1695: my $stats_table = &temp_table_name($courseid,'problem_stats');
1696: #
1697: my $dbh = &Apache::lonmysql::get_dbh();
1698: return undef if (! defined($dbh));
1699: #
1700: # Clean out the table
1701: $dbh->do('DROP TABLE '.$stats_table); # May return an error
1702: my $request =
1703: 'CREATE TEMPORARY TABLE '.$stats_table.' '.
1704: 'SELECT a.student_id,a.solved,a.award,a.awarded,a.tries '.
1705: 'FROM '.$performance_table.' AS a ';
1706: #
1707: # See if we need to include some requirements on the students
1708: if ((defined($Sections) && lc($Sections->[0]) ne 'all') ||
1709: (defined($status) && lc($status) ne 'any')) {
1710: $request .= 'NATURAL LEFT JOIN '.$student_table.' AS b ';
1711: }
1712: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
1713: if (defined($groups_join)) {
1714: $request .= $groups_join;
1715: }
1716: $request .= ' WHERE a.symb_id='.$symb_id.' AND a.part_id='.$part_id;
1717: #
1718: # Limit the students included to those specified
1719: my ($section_limits,$enrollment_limits)=
1720: &limit_by_section_and_status($Sections,$status,'b');
1721: #
1722: # Limit by starttime and endtime
1723: my $time_requirements = undef;
1724: if (defined($starttime)) {
1725: $time_requirements .= 'a.timestamp>='.$starttime;
1726: if (defined($endtime)) {
1727: $time_requirements .= ' AND a.timestamp<='.$endtime;
1728: }
1729: } elsif (defined($endtime)) {
1730: $time_requirements .= 'a.timestamp<='.$endtime;
1731: }
1732: if (defined($time_requirements)) {
1733: $request .= ' AND '.$time_requirements;
1734: }
1735: if (defined($section_limits)) {
1736: $request .= ' AND '.$section_limits;
1737: }
1738: if (defined($enrollment_limits)) {
1739: $request .= ' AND '.$enrollment_limits;
1740: }
1741: # Limit by group, as required
1742: if (defined($group_limits)) {
1743: $request .= ' AND '.$group_limits;
1744: }
1745: #
1746: # Finally, execute the request to create the temporary table
1747: $dbh->do($request);
1748: #
1749: # Collect the first suite of statistics
1750: $request = 'SELECT COUNT(*),SUM(tries),'.
1751: 'AVG(tries),STD(tries) '.
1752: 'FROM '.$stats_table;
1753: my ($num,$tries,$mean,$STD) = &execute_SQL_request
1754: ($dbh,$request);
1755: #
1756: $request = 'SELECT MAX(tries),MIN(tries) FROM '.$stats_table.
1757: ' WHERE awarded>0';
1758: my ($max,$min) = &execute_SQL_request($dbh,$request);
1759: #
1760: $request = 'SELECT SUM(awarded) FROM '.$stats_table;
1761: my ($Solved) = &execute_SQL_request($dbh,$request);
1762: #
1763: $request = 'SELECT SUM(awarded) FROM '.$stats_table.
1764: " WHERE solved='correct_by_override'";
1765: my ($solved) = &execute_SQL_request($dbh,$request);
1766: #
1767: $Solved -= $solved;
1768: #
1769: $num = 0 if (! defined($num));
1770: $tries = 0 if (! defined($tries));
1771: $max = 0 if (! defined($max));
1772: $min = 0 if (! defined($min));
1773: $STD = 0 if (! defined($STD));
1774: $Solved = 0 if (! defined($Solved) || $Solved < 0);
1775: $solved = 0 if (! defined($solved));
1776: #
1777: # Compute the more complicated statistics
1778: my $DegOfDiff = 'nan';
1779: $DegOfDiff = 1-($Solved)/$tries if ($tries>0);
1780: #
1781: my $SKEW = 'nan';
1782: my $wrongpercent = 0;
1783: my $numwrong = 'nan';
1784: if ($num > 0) {
1785: ($SKEW) = &execute_SQL_request($dbh,'SELECT SQRT(SUM('.
1786: 'POWER(tries - '.$STD.',3)'.
1787: '))/'.$num.' FROM '.$stats_table);
1788: $numwrong = $num-$Solved;
1789: $wrongpercent=int(10*100*$numwrong/$num)/10;
1790: }
1791: #
1792: # Drop the temporary table
1793: $dbh->do('DROP TABLE '.$stats_table); # May return an error
1794: #
1795: # Return result
1796: return { num_students => $num,
1797: tries => $tries,
1798: max_tries => $max,
1799: min_tries => $min,
1800: mean_tries => $mean,
1801: std_tries => $STD,
1802: skew_tries => $SKEW,
1803: num_solved => $Solved,
1804: num_override => $solved,
1805: num_wrong => $numwrong,
1806: per_wrong => $wrongpercent,
1807: deg_of_diff => $DegOfDiff };
1808: }
1809:
1810: ##
1811: ## This is a helper for get_statistics
1812: sub execute_SQL_request {
1813: my ($dbh,$request)=@_;
1814: # &Apache::lonnet::logthis($request);
1815: my $sth = $dbh->prepare($request);
1816: if (!$sth) {
1817: die($dbh->errstr . " SQL: $request");
1818: }
1819: $sth->execute();
1820: my $row = $sth->fetchrow_arrayref();
1821: if (ref($row) eq 'ARRAY' && scalar(@$row)>0) {
1822: return @$row;
1823: }
1824: return ();
1825: }
1826:
1827:
1828: sub populate_weight_table {
1829: my ($courseid) = @_;
1830: if (! defined($courseid)) {
1831: $courseid = $env{'request.course.id'};
1832: }
1833: #
1834: &setup_table_names($courseid);
1835: my $navmap = Apache::lonnavmaps::navmap->new();
1836: if (!defined($navmap)) {
1837: &Apache::lonnet::logthis('loncoursedata::populate_weight_table:'.$/.
1838: ' unable to get navmaps resource'.$/.
1839: ' '.join(' ',(caller)));
1840: return;
1841: }
1842: my @sequences = $navmap->retrieveResources(undef,
1843: sub { shift->is_map(); },1,0,1);
1844: my @resources;
1845: foreach my $seq (@sequences) {
1846: push(@resources,$navmap->retrieveResources($seq,
1847: sub {shift->is_gradable();},
1848: 0,0,0));
1849: }
1850: if (! scalar(@resources)) {
1851: &Apache::lonnet::logthis('loncoursedata::populate_weight_table:'.$/.
1852: ' no resources returned for '.$courseid);
1853: return;
1854: }
1855: # Since we use lonnet::EXT to retrieve problem weights,
1856: # to ensure current data we must clear the caches out.
1857: &Apache::lonnet::clear_EXT_cache_status();
1858: my $dbh = &Apache::lonmysql::get_dbh();
1859: my $request = 'INSERT IGNORE INTO '.$weight_table.
1860: "(symb_id,part_id,weight) VALUES ";
1861: my $weight;
1862: foreach my $res (@resources) {
1863: my $symb_id = &get_symb_id($res->symb);
1864: foreach my $part (@{$res->parts}) {
1865: my $part_id = &get_part_id($part);
1866: $weight = &Apache::lonnet::EXT('resource.'.$part.'.weight',
1867: $res->symb,
1868: undef,undef,undef);
1869: if (!defined($weight) || ($weight eq '')) {
1870: $weight=1;
1871: }
1872: $request .= "('".$symb_id."','".$part_id."','".$weight."'),";
1873: }
1874: }
1875: $request =~ s/(,)$//;
1876: # &Apache::lonnet::logthis('request = '.$/.$request);
1877: $dbh->do($request);
1878: if ($dbh->err()) {
1879: &Apache::lonnet::logthis("error ".$dbh->errstr().
1880: " occurred executing \n".
1881: $request);
1882: }
1883: return;
1884: }
1885:
1886: sub limit_by_start_end_time {
1887: my ($starttime,$endtime,$table) = @_;
1888: my $time_requirements = undef;
1889: if (defined($starttime)) {
1890: $time_requirements .= $table.".timestamp>='".$starttime."'";
1891: if (defined($endtime)) {
1892: $time_requirements .= " AND ".$table.".timestamp<='".$endtime."'";
1893: }
1894: } elsif (defined($endtime)) {
1895: $time_requirements .= $table.".timestamp<='".$endtime."'";
1896: }
1897: return $time_requirements;
1898: }
1899:
1900:
1901: sub limit_by_section_and_status {
1902: my ($Sections,$enrollment,$tablename) = @_;
1903: my $student_requirements = undef;
1904: if ( (defined($Sections) && $Sections->[0] ne 'all')) {
1905: $student_requirements = '('.
1906: join(' OR ', map { $tablename.".section='".$_."'" } @$Sections
1907: ).')';
1908: }
1909: my $enrollment_requirements=undef;
1910: if (defined($enrollment) && $enrollment ne 'Any') {
1911: my $now = time();
1912: if ( $enrollment eq 'Future' ) {
1913: $enrollment_requirements =
1914: "( $tablename.start > $now AND ".
1915: "( $tablename.end = 0 OR $tablename.end > $now))";
1916: } elsif ( $enrollment eq 'Active' ) {
1917: $enrollment_requirements =
1918: "(( $tablename.start = 0 OR $tablename.start < $now ) AND ".
1919: " ( $tablename.end = 0 OR $tablename.end > $now ))";
1920: } elsif ( $enrollment eq 'Expired' ) {
1921: $enrollment_requirements =
1922: "(( $tablename.start < $now ) AND ".
1923: " ( $tablename.end < $now ))";
1924: }
1925: }
1926: return ($student_requirements,$enrollment_requirements);
1927: }
1928:
1929:
1930:
1931: sub limit_by_group {
1932: my ($Groups,$stutable,$grptable,$stugrptab) = @_;
1933: my $groups_join = undef;
1934: my $group_limits = undef;
1935: if ( (defined($Groups) && $Groups->[0] ne 'all')) {
1936: $groups_join =
1937: ' LEFT JOIN '.$students_groups_table.
1938: ' AS '.$stugrptab.' ON '.
1939: $stugrptab.'.student_id = '.$stutable.'.student_id'.
1940: ' LEFT JOIN '.$groupnames_table.
1941: ' AS '.$grptable.' ON '.
1942: $stugrptab.'.group_id = '.$grptable.'.group_id ';
1943: $group_limits =
1944: ' ('.
1945: join(' OR ', map { "$grptable.groupname='".$_."'" } @$Groups
1946: ).')';
1947: }
1948: return ($groups_join,$group_limits);
1949: }
1950:
1951:
1952: sub RNK_student { return 0; };
1953: sub RNK_score { return 1; };
1954:
1955: sub rank_students_by_scores_on_resources {
1956: my ($resources,$Sections,$Groups,$enrollment,$courseid,$starttime,$endtime,
1957: $has_award_for) = @_;
1958: return if (! defined($resources) || ! ref($resources) eq 'ARRAY');
1959: if (! defined($courseid)) {
1960: $courseid = $env{'request.course.id'};
1961: }
1962: #
1963: &setup_table_names($courseid);
1964: my $dbh = &Apache::lonmysql::get_dbh();
1965: my ($section_limits,$enrollment_limits)=
1966: &limit_by_section_and_status($Sections,$enrollment,'b');
1967: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
1968: my $symb_limits = '('.join(' OR ',map {'a.symb_id='.&get_symb_id($_);
1969: } @$resources
1970: ).')';
1971: my ($award_col, $award_join, $award_clause) = ('', '', '');
1972: if ($has_award_for) {
1973: my $resource_id = &get_symb_id($has_award_for);
1974: $award_col = ", perf.awarded";
1975: $award_join = "LEFT JOIN $performance_table AS perf ON perf.symb_id"
1976: ." = $resource_id AND perf.student_id = b.student_id ";
1977: $award_clause = "AND perf.awarded IS NOT NULL";
1978: }
1979: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
1980: my $request = "SELECT b.student,SUM(a.awarded*w.weight) AS score "
1981: ."$award_col FROM $performance_table AS a ".
1982: "NATURAL LEFT JOIN $weight_table AS w ".
1983: "LEFT JOIN $student_table AS b ON a.student_id=b.student_id ".
1984: "$award_join $groups_join ";
1985: my $limits;
1986: if (defined($section_limits)) {
1987: $limits .= $section_limits.' AND ';
1988: }
1989: if (defined($enrollment_limits)) {
1990: $limits .= $enrollment_limits.' AND ';
1991: }
1992: if (defined($time_limits)) {
1993: $limits .= $time_limits.' AND ';
1994: }
1995: if ($symb_limits ne '()') {
1996: $limits .= $symb_limits.' AND ';
1997: }
1998: if (defined($group_limits)) {
1999: $limits .= $group_limits.' AND ';
2000: }
2001: if ($limits) {
2002: $limits =~ s/( AND )$//; # Remove extra conjunction
2003: $request .= "WHERE $limits";
2004: }
2005: $request .= " $award_clause GROUP BY a.student_id ORDER BY score, b.student";
2006: #&Apache::lonnet::logthis('request = '.$/.$request);
2007: my $sth = $dbh->prepare($request) or die "Can't prepare $request";
2008: $sth->execute();
2009: my $rows = $sth->fetchall_arrayref();
2010: return ($rows);
2011: }
2012:
2013: sub get_sum_of_scores {
2014: my ($symb,$part,$students,$courseid,$starttime,$endtime) = @_;
2015: if (! defined($courseid)) {
2016: $courseid = $env{'request.course.id'};
2017: }
2018: if (defined($students) &&
2019: ((@$students == 0) ||
2020: (@$students == 1 && (! defined($students->[0]) ||
2021: $students->[0] eq ''))
2022: )
2023: ){
2024: undef($students);
2025: }
2026: #
2027: &setup_table_names($courseid);
2028: my $dbh = &Apache::lonmysql::get_dbh();
2029: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
2030: my $request = 'SELECT SUM(a.awarded*w.weight),SUM(w.weight) FROM '.
2031: $performance_table.' AS a '.
2032: 'NATURAL LEFT JOIN '.$weight_table.' AS w ';
2033: $request .= 'WHERE a.symb_id='.&get_symb_id($symb).
2034: ' AND a.part_id='.&get_part_id($part);
2035: if (defined($time_limits)) {
2036: $request .= ' AND '.$time_limits;
2037: }
2038: if (defined($students)) {
2039: $request .= ' AND ('.
2040: join(' OR ',map {'a.student_id='.&get_student_id(split(':',$_));
2041: } @$students).
2042: ')';
2043: }
2044: my $sth = $dbh->prepare($request);
2045: $sth->execute();
2046: my $rows = $sth->fetchrow_arrayref();
2047: if ($dbh->err) {
2048: &Apache::lonnet::logthis('error 1 = '.$dbh->errstr());
2049: &Apache::lonnet::logthis('prepared then executed, fetchrow_arrayrefed'.
2050: $/.$request);
2051: return (undef,undef);
2052: }
2053: return ($rows->[0],$rows->[1]);
2054: }
2055:
2056:
2057: sub score_stats {
2058: my ($Sections,$Groups,$enrollment,$symbs,$starttime,$endtime,$courseid)=@_;
2059: if (! defined($courseid)) {
2060: $courseid = $env{'request.course.id'};
2061: }
2062: #
2063: &setup_table_names($courseid);
2064: my $dbh = &Apache::lonmysql::get_dbh();
2065: #
2066: my ($section_limits,$enrollment_limits)=
2067: &limit_by_section_and_status($Sections,$enrollment,'b');
2068: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
2069: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
2070: my @Symbids = map { &get_symb_id($_); } @{$symbs};
2071: #
2072: my $stats_table = &temp_table_name($courseid,'problem_stats');
2073: my $symb_restriction = join(' OR ',map {'a.symb_id='.$_;} @Symbids);
2074: my $request = 'DROP TABLE '.$stats_table;
2075: $dbh->do($request);
2076: $request =
2077: 'CREATE TEMPORARY TABLE '.$stats_table.' '.
2078: 'SELECT a.student_id,'.
2079: 'SUM(a.awarded*w.weight) AS score FROM '.
2080: $performance_table.' AS a '.
2081: 'NATURAL LEFT JOIN '.$weight_table.' AS w '.
2082: 'LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id '.
2083: $groups_join;
2084: my $limit = ' WHERE ('.$symb_restriction.')';
2085: if ($time_limits) {
2086: $limit .= ' AND '.$time_limits;
2087: }
2088: if ($section_limits) {
2089: $limit .= ' AND '.$section_limits;
2090: }
2091: if ($enrollment_limits) {
2092: $limit .= ' AND '.$enrollment_limits;
2093: }
2094: if ($group_limits) {
2095: $limit .= ' AND '.$group_limits;
2096: }
2097: $request .= $limit.' GROUP BY a.student_id';
2098: # &Apache::lonnet::logthis('request = '.$/.$request);
2099: my $sth = $dbh->prepare($request);
2100: $sth->execute();
2101: $request =
2102: 'SELECT AVG(score),STD(score),MAX(score),MIN(score),COUNT(score) '.
2103: 'FROM '.$stats_table;
2104: my ($ave,$std,$max,$min,$count) = &execute_SQL_request($dbh,$request);
2105: # &Apache::lonnet::logthis('request = '.$/.$request);
2106:
2107: $request = 'SELECT SUM(weight) FROM '.$weight_table.
2108: ' AS a WHERE ('.$symb_restriction.')';
2109: my ($max_possible) = &execute_SQL_request($dbh,$request);
2110: # &Apache::lonnet::logthis('request = '.$/.$request);
2111: return($min,$max,$ave,$std,$count,$max_possible);
2112: }
2113:
2114:
2115:
2116: sub count_stats {
2117: my ($Sections,$Groups,$enrollment,$symbs,$starttime,$endtime,$courseid)=@_;
2118: if (! defined($courseid)) {
2119: $courseid = $env{'request.course.id'};
2120: }
2121: #
2122: &setup_table_names($courseid);
2123: my $dbh = &Apache::lonmysql::get_dbh();
2124: #
2125: my ($section_limits,$enrollment_limits)=
2126: &limit_by_section_and_status($Sections,$enrollment,'b');
2127: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
2128: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
2129: my @Symbids = map { &get_symb_id($_); } @{$symbs};
2130: #
2131: my $stats_table = &temp_table_name($courseid,'problem_stats');
2132: my $symb_restriction = join(' OR ',map {'a.symb_id='.$_;} @Symbids);
2133: my $request = 'DROP TABLE '.$stats_table;
2134: $dbh->do($request);
2135: $request =
2136: 'CREATE TEMPORARY TABLE '.$stats_table.' '.
2137: 'SELECT a.student_id,'.
2138: 'SUM(a.awarded) AS count FROM '.
2139: $performance_table.' AS a '.
2140: 'LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id '.
2141: $groups_join;
2142: my $limit = ' WHERE ('.$symb_restriction.')';
2143: if ($time_limits) {
2144: $limit .= ' AND '.$time_limits;
2145: }
2146: if ($section_limits) {
2147: $limit .= ' AND '.$section_limits;
2148: }
2149: if ($enrollment_limits) {
2150: $limit .= ' AND '.$enrollment_limits;
2151: }
2152: if ($group_limits) {
2153: $limit .= ' AND '.$group_limits;
2154: }
2155: $request .= $limit.' GROUP BY a.student_id';
2156: # &Apache::lonnet::logthis('request = '.$/.$request);
2157: my $sth = $dbh->prepare($request);
2158: $sth->execute();
2159: $request =
2160: 'SELECT AVG(count),STD(count),MAX(count),MIN(count),COUNT(count) '.
2161: 'FROM '.$stats_table;
2162: my ($ave,$std,$max,$min,$count) = &execute_SQL_request($dbh,$request);
2163: # &Apache::lonnet::logthis('request = '.$/.$request);
2164: return($min,$max,$ave,$std,$count);
2165: }
2166:
2167:
2168: sub get_student_data {
2169: my ($students,$courseid) = @_;
2170: $courseid = $env{'request.course.id'} if (! defined($courseid));
2171: &setup_table_names($courseid);
2172: my $dbh = &Apache::lonmysql::get_dbh();
2173: return undef if (! defined($dbh));
2174: my $request = 'SELECT '.
2175: 'student_id, student '.
2176: 'FROM '.$student_table;
2177: if (defined($students)) {
2178: $request .= ' WHERE ('.
2179: join(' OR ', map {'student_id='.
2180: &get_student_id($_->{'username'},
2181: $_->{'domain'})
2182: } @$students
2183: ).')';
2184: }
2185: $request.= ' ORDER BY student_id';
2186: my $sth = $dbh->prepare($request);
2187: $sth->execute();
2188: if ($dbh->err) {
2189: &Apache::lonnet::logthis('error 2 = '.$dbh->errstr());
2190: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2191: return undef;
2192: }
2193: my $dataset = $sth->fetchall_arrayref();
2194: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2195: return $dataset;
2196: }
2197: }
2198:
2199: sub RD_student_id { return 0; }
2200: sub RD_awarddetail { return 1; }
2201: sub RD_response_eval { return 2; }
2202: sub RD_response_eval_2 { return 3; }
2203: sub RD_submission { return 4; }
2204: sub RD_timestamp { return 5; }
2205: sub RD_tries { return 6; }
2206: sub RD_sname { return 7; }
2207:
2208: sub get_response_data {
2209: my ($Sections,$Groups,$enrollment,$symb,$response,$courseid) = @_;
2210: return undef if (! defined($symb) ||
2211: ! defined($response));
2212: $courseid = $env{'request.course.id'} if (! defined($courseid));
2213: #
2214: &setup_table_names($courseid);
2215: my $symb_id = &get_symb_id($symb);
2216: if (! defined($symb_id)) {
2217: &Apache::lonnet::logthis('Unable to find symb for '.$symb.' in '.$courseid);
2218: return undef;
2219: }
2220: my $response_id = &get_part_id($response);
2221: if (! defined($response_id)) {
2222: &Apache::lonnet::logthis('Unable to find id for '.$response.' in '.$courseid);
2223: return undef;
2224: }
2225: #
2226: my $dbh = &Apache::lonmysql::get_dbh();
2227: return undef if (! defined($dbh));
2228: #
2229: my ($student_requirements,$enrollment_requirements) =
2230: &limit_by_section_and_status($Sections,$enrollment,'d');
2231: my ($groups_join,$group_limits) = &limit_by_group($Groups,'d','e','f');
2232: my $request = 'SELECT '.
2233: 'a.student_id, a.awarddetail, a.response_specific_value, '.
2234: 'a.response_specific_value_2, a.submission, b.timestamp, '.
2235: 'c.tries, d.student '.
2236: 'FROM '.$fulldump_response_table.' AS a '.
2237: 'LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
2238: 'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
2239: 'a.transaction = b.transaction '.
2240: 'LEFT JOIN '.$fulldump_part_table.' AS c '.
2241: 'ON a.symb_id=c.symb_id AND a.student_id=c.student_id AND '.
2242: 'a.part_id=c.part_id AND a.transaction = c.transaction '.
2243: 'LEFT JOIN '.$student_table.' AS d '.
2244: 'ON a.student_id=d.student_id '.
2245: $groups_join;
2246: my $limit = ' WHERE '.
2247: 'a.symb_id='.$symb_id.' AND a.response_id='.$response_id;
2248: if (defined($student_requirements)) {
2249: $limit .= ' AND '.$student_requirements;
2250: }
2251: if (defined($enrollment_requirements)) {
2252: $limit .= ' AND '.$enrollment_requirements;
2253: }
2254: if (defined($group_limits)) {
2255: $limit .= ' AND '.$group_limits;
2256: }
2257: $request .= $limit.' ORDER BY b.timestamp';
2258: # &Apache::lonnet::logthis("request =\n".$request);
2259: my $sth = $dbh->prepare($request);
2260: $sth->execute();
2261: if ($dbh->err) {
2262: &Apache::lonnet::logthis('error 3 = '.$dbh->errstr());
2263: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2264: return undef;
2265: }
2266: my $dataset = $sth->fetchall_arrayref();
2267: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2268: # Clear the \'s from around the submission
2269: for (my $i =0;$i<scalar(@$dataset);$i++) {
2270: $dataset->[$i]->[&RD_submission()] =~ s/(\'$|^\')//g;
2271: }
2272: return $dataset;
2273: }
2274: }
2275:
2276:
2277: sub RDs_awarddetail { return 3; }
2278: sub RDs_submission { return 2; }
2279: sub RDs_timestamp { return 1; }
2280: sub RDs_tries { return 0; }
2281: sub RDs_awarded { return 4; }
2282: sub RDs_response_eval { return 5; }
2283: sub RDs_response_eval_2 { return 6; }
2284: sub RDs_part_award { return 7; }
2285:
2286: sub get_response_data_by_student {
2287: my ($student,$symb,$response,$courseid) = @_;
2288: return undef if (! defined($symb) ||
2289: ! defined($response));
2290: $courseid = $env{'request.course.id'} if (! defined($courseid));
2291: #
2292: &setup_table_names($courseid);
2293: my $symb_id = &get_symb_id($symb);
2294: my $response_id = &get_part_id($response);
2295: #
2296: my $student_id = &get_student_id($student->{'username'},
2297: $student->{'domain'});
2298: #
2299: my $dbh = &Apache::lonmysql::get_dbh();
2300: return undef if (! defined($dbh));
2301: my $request = 'SELECT '.
2302: 'c.tries, b.timestamp, a.submission, a.awarddetail, c.awarded, '.
2303: 'a.response_specific_value, a.response_specific_value_2, c.award '.
2304: 'FROM '.$fulldump_response_table.' AS a '.
2305: 'LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
2306: 'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
2307: 'a.transaction = b.transaction '.
2308: 'LEFT JOIN '.$fulldump_part_table.' AS c '.
2309: 'ON a.symb_id=c.symb_id AND a.student_id=c.student_id AND '.
2310: 'a.part_id=c.part_id AND a.transaction = c.transaction '.
2311: 'LEFT JOIN '.$student_table.' AS d '.
2312: 'ON a.student_id=d.student_id '.
2313: 'LEFT JOIN '.$performance_table.' AS e '.
2314: 'ON a.symb_id=e.symb_id AND a.part_id=e.part_id AND '.
2315: 'a.student_id=e.student_id AND c.tries=e.tries '.
2316: 'WHERE '.
2317: 'a.symb_id='.$symb_id.' AND a.response_id='.$response_id.
2318: ' AND a.student_id='.$student_id.' ORDER BY b.timestamp';
2319: # &Apache::lonnet::logthis("request =\n".$request);
2320: my $sth = $dbh->prepare($request);
2321: $sth->execute();
2322: if ($dbh->err) {
2323: &Apache::lonnet::logthis('error 4 = '.$dbh->errstr());
2324: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2325: return undef;
2326: }
2327: my $dataset = $sth->fetchall_arrayref();
2328: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2329: # Clear the \'s from around the submission
2330: for (my $i =0;$i<scalar(@$dataset);$i++) {
2331: $dataset->[$i]->[&RDs_submission] =~ s/(\'$|^\')//g;
2332: }
2333: return $dataset;
2334: }
2335: return undef; # error occurred
2336: }
2337:
2338: sub RT_student_id { return 0; }
2339: sub RT_awarded { return 1; }
2340: sub RT_tries { return 2; }
2341: sub RT_timestamp { return 3; }
2342:
2343: sub get_response_time_data {
2344: my ($sections,$groups,$enrollment,$symb,$part,$courseid) = @_;
2345: return undef if (! defined($symb) ||
2346: ! defined($part));
2347: $courseid = $env{'request.course.id'} if (! defined($courseid));
2348: #
2349: &setup_table_names($courseid);
2350: my $symb_id = &get_symb_id($symb);
2351: if (! defined($symb_id)) {
2352: &Apache::lonnet::logthis('Unable to find symb for '.$symb.' in '.$courseid);
2353: return undef;
2354: }
2355: my $part_id = &get_part_id($part);
2356: if (! defined($part_id)) {
2357: &Apache::lonnet::logthis('Unable to find id for '.$part.' in '.$courseid);
2358: return undef;
2359: }
2360: #
2361: my $dbh = &Apache::lonmysql::get_dbh();
2362: return undef if (! defined($dbh));
2363: my ($student_requirements,$enrollment_requirements) =
2364: &limit_by_section_and_status($sections,$enrollment,'d');
2365: my ($groups_join,$group_limits) = &limit_by_group($groups,'d','e','f');
2366: my $request = 'SELECT '.
2367: 'a.student_id, a.awarded, a.tries, b.timestamp '.
2368: 'FROM '.$fulldump_part_table.' AS a '.
2369: 'LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
2370: 'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
2371: 'a.transaction = b.transaction '.
2372: 'LEFT JOIN '.$student_table.' as d '.
2373: 'ON a.student_id=d.student_id '.
2374: $groups_join;
2375: my $limit = ' WHERE '.
2376: 'a.symb_id='.$symb_id.' AND a.part_id='.$part_id;
2377: if (defined($student_requirements)) {
2378: $limit .= ' AND '.$student_requirements;
2379: }
2380: if (defined($enrollment_requirements)) {
2381: $limit .= ' AND '.$enrollment_requirements;
2382: }
2383: if (defined($group_limits)) {
2384: $limit .= ' AND '.$group_limits;
2385: }
2386: $request .= $limit.' ORDER BY b.timestamp';
2387: # &Apache::lonnet::logthis("request =\n".$request);
2388: my $sth = $dbh->prepare($request);
2389: $sth->execute();
2390: if ($dbh->err) {
2391: &Apache::lonnet::logthis('error 5 = '.$dbh->errstr());
2392: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2393: return undef;
2394: }
2395: my $dataset = $sth->fetchall_arrayref();
2396: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2397: return $dataset;
2398: }
2399:
2400: }
2401:
2402: sub get_student_scores {
2403: my ($sections,$groups,$Symbs,$enrollment,$courseid,$starttime,$endtime) = @_;
2404: $courseid = $env{'request.course.id'} if (! defined($courseid));
2405: &setup_table_names($courseid);
2406: my $dbh = &Apache::lonmysql::get_dbh();
2407: return (undef) if (! defined($dbh));
2408: my $tmptable = &temp_table_name($courseid,'temp_'.time);
2409: my $request = 'DROP TABLE IF EXISTS '.$tmptable;
2410: # &Apache::lonnet::logthis('request = '.$/.$request);
2411: $dbh->do($request);
2412: #
2413: my $symb_requirements;
2414: if (defined($Symbs) && @$Symbs) {
2415: $symb_requirements = '('.
2416: join(' OR ', map{ "(a.symb_id='".&get_symb_id($_->{'symb'}).
2417: "' AND a.part_id='".&get_part_id($_->{'part'}).
2418: "')"
2419: } @$Symbs).')';
2420: }
2421: #
2422: my ($student_requirements,$enrollment_requirements) =
2423: &limit_by_section_and_status($sections,$enrollment,'b');
2424: #
2425: my ($groups_join,$group_limits) = &limit_by_group($groups,'b','d','e');
2426: my $time_requirements = &limit_by_start_end_time($starttime,$endtime,'a');
2427: ##
2428: $request = 'CREATE TEMPORARY TABLE IF NOT EXISTS '.$tmptable.
2429: ' SELECT a.student_id,SUM(a.awarded*c.weight) AS score FROM '.
2430: $performance_table.' AS a ';
2431: $request .= "LEFT JOIN ".$weight_table.' AS c ON a.symb_id=c.symb_id AND a.part_id=c.part_id ';
2432: if (defined($student_requirements) || defined($enrollment_requirements)) {
2433: $request .= ' LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id ';
2434: }
2435: if (defined($groups_join)) {
2436: $request .= $groups_join;
2437: }
2438: if (defined($symb_requirements) ||
2439: defined($student_requirements) ||
2440: defined($enrollment_requirements) ||
2441: defined($group_limits) ) {
2442: $request .= ' WHERE ';
2443: }
2444: if (defined($symb_requirements)) {
2445: $request .= $symb_requirements.' AND ';
2446: }
2447: if (defined($student_requirements)) {
2448: $request .= $student_requirements.' AND ';
2449: }
2450: if (defined($enrollment_requirements)) {
2451: $request .= $enrollment_requirements.' AND ';
2452: }
2453: if (defined($time_requirements)) {
2454: $request .= $time_requirements.' AND ';
2455: }
2456: $request =~ s/ AND $//; # Strip of the trailing ' AND '.
2457: $request .= ' GROUP BY a.student_id';
2458: # &Apache::lonnet::logthis("request = \n".$request);
2459: my $sth = $dbh->prepare($request);
2460: $sth->execute();
2461: if ($dbh->err) {
2462: &Apache::lonnet::logthis('error 6 = '.$dbh->errstr());
2463: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2464: return undef;
2465: }
2466: $request = 'SELECT score,COUNT(*) FROM '.$tmptable.' GROUP BY score';
2467: # &Apache::lonnet::logthis("request = \n".$request);
2468: $sth = $dbh->prepare($request);
2469: $sth->execute();
2470: if ($dbh->err) {
2471: &Apache::lonnet::logthis('error 7 = '.$dbh->errstr());
2472: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2473: return undef;
2474: }
2475: my $dataset = $sth->fetchall_arrayref();
2476: return $dataset;
2477: }
2478:
2479:
2480:
2481: sub setup_table_names {
2482: my ($courseid) = @_;
2483: if (! defined($courseid)) {
2484: $courseid = $env{'request.course.id'};
2485: }
2486: #
2487: if (! defined($current_course) || $current_course ne $courseid) {
2488: # Clear out variables
2489: $have_read_part_table = 0;
2490: undef(%ids_by_part);
2491: undef(%parts_by_id);
2492: $have_read_symb_table = 0;
2493: undef(%ids_by_symb);
2494: undef(%symbs_by_id);
2495: $have_read_student_table = 0;
2496: undef(%ids_by_student);
2497: undef(%students_by_id);
2498: $have_read_groupnames_table = 0;
2499: undef(%ids_by_groupname);
2500: #
2501: $current_course = $courseid;
2502: }
2503: #
2504: # Set up database names
2505: my $base_id = 'md5_'.&Digest::MD5::md5_hex($courseid);
2506: $symb_table = $base_id.'_'.'symb';
2507: $part_table = $base_id.'_'.'part';
2508: $student_table = $base_id.'_'.'student';
2509: $groupnames_table = $base_id.'_'.'groupnames';
2510: $students_groups_table = $base_id.'_'.'studentgroups';
2511: $performance_table = $base_id.'_'.'performance';
2512: $parameters_table = $base_id.'_'.'parameters';
2513: $fulldump_part_table = $base_id.'_'.'partdata';
2514: $fulldump_response_table = $base_id.'_'.'responsedata';
2515: $fulldump_timestamp_table = $base_id.'_'.'timestampdata';
2516: $weight_table = $base_id.'_'.'weight';
2517: #
2518: @Tables = (
2519: $symb_table,
2520: $part_table,
2521: $student_table,
2522: $groupnames_table,
2523: $students_groups_table,
2524: $performance_table,
2525: $parameters_table,
2526: $fulldump_part_table,
2527: $fulldump_response_table,
2528: $fulldump_timestamp_table,
2529: $weight_table,
2530: );
2531: return;
2532: }
2533:
2534: sub temp_table_name {
2535: my ($courseid,$affix) = @_;
2536: my $base_id = 'md5_'.&Digest::MD5::md5_hex($courseid);
2537: return $base_id.'_'.$affix;
2538: }
2539:
2540:
2541: } # End scope of table identifiers
2542:
2543:
2544:
2545: sub CL_SDOM { return 0; }
2546: sub CL_SNAME { return 1; }
2547: sub CL_END { return 2; }
2548: sub CL_START { return 3; }
2549: sub CL_ID { return 4; }
2550: sub CL_SECTION { return 5; }
2551: sub CL_FULLNAME { return 6; }
2552: sub CL_STATUS { return 7; }
2553: sub CL_TYPE { return 8; }
2554: sub CL_LOCKEDTYPE { return 9; }
2555: sub CL_CREDITS { return 10; }
2556: sub CL_INSTSEC { return 11; }
2557: sub CL_GROUP { return 12; }
2558: sub CL_PERMANENTEMAIL { return 13; }
2559: sub CL_ROLE { return 14; }
2560: sub CL_EXTENT { return 15; }
2561: sub CL_PHOTO { return 16; }
2562: sub CL_THUMBNAIL { return 17; }
2563: sub CL_AUTHORQUOTA { return 18; }
2564: sub CL_AUTHORUSAGE { return 19; }
2565:
2566: sub get_classlist {
2567: my ($cdom,$cnum) = @_;
2568: my $cid = $cdom.'_'.$cnum;
2569: if (!defined($cdom) || !defined($cnum)) {
2570: $cid = $env{'request.course.id'};
2571: $cdom = $env{'course.'.$cid.'.domain'};
2572: $cnum = $env{'course.'.$cid.'.num'};
2573: }
2574: my $now = time;
2575: #
2576: my %classlist=&Apache::lonnet::dump('classlist',$cdom,$cnum);
2577: while (my ($student,$info) = each(%classlist)) {
2578: if ($student =~ /^(con_lost|error|no_such_host)/i) {
2579: &Apache::lonnet::logthis('get_classlist error for '.$cid.':'.$student);
2580: return undef;
2581: }
2582: my ($sname,$sdom) = split(/:/,$student);
2583: my @Values = split(/:/,$info);
2584: my ($end,$start,$id,$section,$fullname,$type,$lockedtype,$credits,$instsec);
2585: if (@Values > 2) {
2586: ($end,$start,$id,$section,$fullname,$type,$lockedtype,$credits,$instsec) = @Values;
2587: } else { # We have to get the data ourselves
2588: ($end,$start) = @Values;
2589: $section = &Apache::lonnet::getsection($sdom,$sname,$cid);
2590: my %info=&Apache::lonnet::get('environment',
2591: ['firstname','middlename',
2592: 'lastname','generation','id'],
2593: $sdom, $sname);
2594: my ($tmp) = keys(%info);
2595: if ($tmp =~/^(con_lost|error|no_such_host)/i) {
2596: $fullname = 'not available';
2597: $id = 'not available';
2598: &Apache::lonnet::logthis('unable to retrieve environment '.
2599: 'for '.$sname.':'.$sdom);
2600: } else {
2601: $fullname = &Apache::lonnet::format_name(@info{qw/firstname middlename lastname generation/},'lastname');
2602: $id = $info{'id'};
2603: }
2604: # Update the classlist with this students information
2605: if ($fullname ne 'not available') {
2606: my $enrolldata = join(':',$end,$start,$id,$section,$fullname);
2607: my $reply=&Apache::lonnet::cput('classlist',
2608: {$student => $enrolldata},
2609: $cdom,$cnum);
2610: if ($reply !~ /^(ok|delayed)/) {
2611: &Apache::lonnet::logthis('Unable to update classlist for '.
2612: 'student '.$sname.':'.$sdom.
2613: ' error:'.$reply);
2614: }
2615: }
2616: }
2617: my $status='Expired';
2618: if(((!$end) || $now < $end) && ((!$start) || ($now > $start))) {
2619: $status='Active';
2620: }
2621: if(($now < $start) && ((!$end) || $now < $end )) {
2622: $status='Future';
2623: }
2624: $classlist{$student} =
2625: [$sdom,$sname,$end,$start,$id,$section,$fullname,$status,$type,
2626: $lockedtype,$credits,$instsec];
2627: }
2628: if (wantarray()) {
2629: return (\%classlist,['domain','username','end','start','id',
2630: 'section','fullname','status','type',
2631: 'lockedtype','credits','instsec']);
2632: } else {
2633: return \%classlist;
2634: }
2635: }
2636:
2637: sub get_group_memberships {
2638: my ($classlist,$keylist,$cdom,$cnum) = @_;
2639:
2640: return ({},{}) if (!ref($classlist) || !ref($keylist));
2641:
2642: my $cid = $cdom.'_'.$cnum;
2643: if (!defined($cdom) || !defined($cnum)) {
2644: $cid = $env{'request.course.id'};
2645: $cdom = $env{'course.'.$cid.'.domain'};
2646: $cnum = $env{'course.'.$cid.'.num'};
2647: }
2648: my (%classgroups,%studentgroups);
2649: my $now = time;
2650: my $access_end = $env{'course.'.$cid.'.default_enrollment_end_date'};
2651: my %curr_groups =&Apache::longroup::coursegroups($cdom,$cnum);
2652: if (%curr_groups) {
2653: my $grpindex = &CL_GROUP();
2654: my %groupmemberhash =
2655: &Apache::lonnet::get_group_membership($cdom,$cnum);
2656: foreach my $student (keys(%{$classlist})) {
2657: %{$classgroups{$student}} = ();
2658: my $hasgroup = 0;
2659: foreach my $status ('previous','future','active','aftercourse') {
2660: %{$classgroups{$student}{$status}} = ();
2661: }
2662: foreach my $group (keys(%curr_groups)) {
2663: if (defined($groupmemberhash{$group.':'.$student})) {
2664: my ($end,$start) = split(/:/,$groupmemberhash{$group.':'.
2665: $student});
2666: if ($start == -1) {
2667: next;
2668: } else {
2669: $studentgroups{$group} ++;
2670: $hasgroup = 1;
2671: if ($end && $end < $now) {
2672: $classgroups{$student}{'previous'}{$group} =
2673: $groupmemberhash{$group.':'.$student};
2674: if ($classlist->{$student}[&CL_STATUS()] eq 'Expired') {
2675: if ($access_end && $access_end < $now) {
2676: if ($access_end - $end < 86400) {
2677: $classgroups{$student}{'aftercourse'}{$group} = $groupmemberhash{$group.':'.$student};
2678: }
2679: }
2680: }
2681: } elsif ($now > $start) {
2682: if (!$end || $end > $now) {
2683: $classgroups{$student}{'active'}{$group} =
2684: $groupmemberhash{$group.':'.$student};
2685: }
2686: } else {
2687: $classgroups{$student}{'future'}{$group} =
2688: $groupmemberhash{$group.':'.$student};
2689: }
2690: }
2691: }
2692: }
2693: if (!$hasgroup) {
2694: $studentgroups{'none'} ++;
2695: } else {
2696: $classlist->{$student}->[$grpindex] = join(',',
2697: sort(keys(%{$classgroups{$student}{'active'}})));
2698: }
2699: }
2700: }
2701: return (\%classgroups,\%studentgroups);
2702: }
2703:
2704: sub get_students_groups {
2705: my ($student,$enrollment_status,$classgroups) = @_;
2706: my @studentsgroups = ();
2707: if (ref($$classgroups{$student}{'active'}) eq 'HASH') {
2708: push(@studentsgroups,keys(%{$$classgroups{$student}{'active'}}));
2709: }
2710: if ($enrollment_status eq 'Any') {
2711: foreach my $status ('previous','future') {
2712: if (ref($$classgroups{$student}{$status}) eq 'HASH') {
2713: push(@studentsgroups,keys(%{$$classgroups{$student}{$status}}));
2714: }
2715: }
2716: } else {
2717: if (ref($$classgroups{$student}{'aftercourse'}) eq 'HASH') {
2718: push(@studentsgroups,keys(%{$$classgroups{$student}{'aftercourse'}}));
2719: }
2720: }
2721: return @studentsgroups;
2722: }
2723:
2724:
2725: # ----- END HELPER FUNCTIONS --------------------------------------------
2726:
2727: 1;
2728: __END__
2729:
2730:
2731: =pod
2732:
2733: =head1 NAME
2734:
2735: Apache::loncoursedata
2736:
2737: =head1 SYNOPSIS
2738:
2739: Set of functions that download and process student and course information.
2740:
2741: =head1 PACKAGES USED
2742:
2743: Apache::lonnet
2744: Apache::longroup
2745: Time::HiRes
2746: Apache::lonmysql
2747: LONCAPA
2748: Digest::MD5
2749:
2750: =head1 DOWNLOAD INFORMATION
2751:
2752: This section contains all the functions that get data from other servers
2753: and/or itself.
2754:
2755:
2756:
2757: =head1 LOCAL DATA CACHING SUBROUTINES
2758:
2759: The local caching is done using MySQL. There is no fall-back implementation
2760: if MySQL is not running.
2761:
2762: The programmers interface is to call &get_current_state() or some other
2763: primary interface subroutine (described below). The internals of this
2764: storage system are documented here.
2765:
2766: There are six tables used to store student performance data (the results of
2767: a dumpcurrent). Each of these tables is created in MySQL with a name of
2768: $courseid_*****, where ***** is 'symb', 'part', or whatever is appropriate
2769: for the table. The tables and their purposes are described below.
2770:
2771: Some notes before we get started.
2772:
2773: Each table must have a PRIMARY KEY, which is a column or set of columns which
2774: will serve to uniquely identify a row of data. NULL is not allowed!
2775:
2776: INDEXes work best on integer data.
2777:
2778: JOIN is used to combine data from many tables into one output.
2779:
2780: lonmysql.pm is used for some of the interface, specifically the table creation
2781: calls. The inserts are done in bulk by directly calling the database handler.
2782: The SELECT ... JOIN statement used to retrieve the data does not have an
2783: interface in lonmysql.pm and I shudder at the thought of writing one.
2784:
2785: =head2 Table Descriptions
2786:
2787: =over 4
2788:
2789: =head2 Tables used to store meta information
2790:
2791: The following tables hold data required to keep track of the current status
2792: of a students data in the tables or to look up the students data in the tables.
2793:
2794: =over 4
2795:
2796: =item C<$symb_table>
2797:
2798: The symb_table has two columns. The first is a 'symb_id' and the second
2799: is the text name for the 'symb' (limited to 64k). The 'symb_id' is generated
2800: automatically by MySQL so inserts should be done on this table with an
2801: empty first element. This table has its PRIMARY KEY on the 'symb_id'.
2802:
2803: =item C<$part_table>
2804:
2805: The part_table has two columns. The first is a 'part_id' and the second
2806: is the text name for the 'part' (limited to 100 characters). The 'part_id' is
2807: generated automatically by MySQL so inserts should be done on this table with
2808: an empty first element. This table has its PRIMARY KEY on the 'part' (100
2809: characters) and a KEY on 'part_id'.
2810:
2811: =item C<$student_table>
2812:
2813: The student_table has 7 columns. The first is a 'student_id' assigned by
2814: MySQL. The second is 'student' which is username:domain. The third through
2815: fifth are 'section', 'status' (enrollment status), and 'classification'
2816: (to be used in the future). The sixth and seventh ('updatetime' and
2817: 'fullupdatetime') contain the time of last update and full update of student
2818: data. This table has its PRIMARY KEY on the 'student_id' column and is indexed
2819: on 'student', 'section', and 'status'.
2820:
2821: =item C<$groupnames_table>
2822:
2823: The groupnames_table has 2 columns. The first is a 'group_id' assigned by
2824: MySQL. The second is 'groupname' which is the name of the group in the course.
2825:
2826: =item C<$students_groups_table>
2827:
2828: The students_groups_table has 2 columns. The first is the 'student_id', and the
2829: second is the 'group_id'. These two columns comprise the PRIMARY KEY for this
2830: table, as an individual student may be affiliated with more than one group at
2831: any time. This table is indexed on both student_id and group_id.
2832:
2833: =back
2834:
2835: =head2 Tables used to store current status data
2836:
2837: The following tables store data only about the students current status on
2838: a problem, meaning only the data related to the last attempt on a problem.
2839:
2840: =over 4
2841:
2842: =item C<$performance_table>
2843:
2844: The performance_table has 9 columns. The first three are 'symb_id',
2845: 'student_id', and 'part_id'. These comprise the PRIMARY KEY for this table
2846: and are directly related to the $symb_table, $student_table, and $part_table
2847: described above. MySQL does better indexing on numeric items than text,
2848: so we use these three "index tables". The remaining columns are
2849: 'solved', 'tries', 'awarded', 'award', 'awarddetail', and 'timestamp'.
2850: These are either the MySQL type TINYTEXT or various integers ('tries' and
2851: 'timestamp'). This table has KEYs of 'student_id' and 'symb_id'.
2852: For use of this table, see the functions described below.
2853:
2854: =item C<$parameters_table>
2855:
2856: The parameters_table holds the data that does not fit neatly into the
2857: performance_table. The parameters table has four columns: 'symb_id',
2858: 'student_id', 'parameter', and 'value'. 'symb_id', 'student_id', and
2859: 'parameter' comprise the PRIMARY KEY for this table. 'parameter' is
2860: limited to 255 characters. 'value' is limited to 64k characters.
2861:
2862: =back
2863:
2864: =head2 Tables used for storing historic data
2865:
2866: The following tables are used to store almost all of the transactions a student
2867: has made on a homework problem. See loncapa/docs/homework/datastorage for
2868: specific information about each of the parameters stored.
2869:
2870: =over 4
2871:
2872: =item C<$fulldump_response_table>
2873:
2874: The response table holds data (documented in loncapa/docs/homework/datastorage)
2875: associated with a particular response id which is stored when a student
2876: attempts a problem. The following are the columns of the table, in order:
2877: 'symb_id','part_id','response_id','student_id','transaction','tries',
2878: 'awarddetail', 'response_specific', 'response_specific_value',
2879: 'response_specific_2', 'response_specific_value_2', and 'submission
2880: (the text of the students submission). The primary key is based on the
2881: first five columns listed above.
2882:
2883: =item C<$fulldump_part_table()>
2884:
2885: The part table holds data (documented in loncapa/docs/homework/datastorage)
2886: associated with a particular part id which is stored when a student attempts
2887: a problem. The following are the columns of the table, in order:
2888: 'symb_id','part_id','student_id','transaction','tries','award','awarded',
2889: and 'previous'. The primary key is based on the first five columns listed
2890: above.
2891:
2892: =item C<$fulldump_timestamp_table()>
2893:
2894: The timestamp table holds the timestamps of the transactions which are
2895: stored in $fulldump_response_table and $fulldump_part_table. This data is
2896: about both the response and part data. Columns: 'symb_id','student_id',
2897: 'transaction', and 'timestamp'.
2898: The primary key is based on the first 3 columns.
2899:
2900: =item C<$weight_table()>
2901:
2902: The weight table holds the weight for the problems used in the class.
2903: Whereas the weight of a problem can vary by section and student the data
2904: here is applied to the class as a whole.
2905: Columns: 'symb_id','part_id','response_id','weight'.
2906:
2907: =back
2908:
2909:
2910: =head1 IMPORTANT SUBROUTINES
2911:
2912: Here is a brief overview of the subroutines which are likely to be of
2913: interest:
2914:
2915: =over 4
2916:
2917: =item C<&get_current_state()>
2918:
2919: programmers interface.
2920:
2921: =item C<&init_dbs()>
2922:
2923: table creation
2924:
2925: =item C<&update_student_data()>
2926:
2927: data storage calls
2928:
2929: =item C<&get_student_data_from_performance_cache()>
2930:
2931: data retrieval
2932:
2933: =back
2934:
2935: =head1 OTHER SUBROUTINES
2936:
2937: =over 4
2938:
2939: =item C<&make_into_hash($values)>
2940:
2941: Returns a reference to a hash as described by $values. $values is
2942: assumed to be the result of
2943: join(':',map {&escape($_)} %orighash);
2944:
2945: This is a helper function for get_current_state.
2946:
2947: =item C<&init_dbs()>
2948:
2949: Input: course id
2950:
2951: Output: 0 on success, positive integer on error
2952:
2953: This routine issues the calls to lonmysql to create the tables used to
2954: store student data.
2955:
2956: item C<&delete_caches()>
2957:
2958: This routine drops all the tables associated with a course from the
2959: MySQL database.
2960:
2961: Input: course id (optional, determined by environment if omitted)
2962:
2963: Returns: nothing
2964:
2965: =item C<&get_part_id()>
2966:
2967: Get the MySQL id of a problem part string.
2968:
2969: Input: $part
2970:
2971: Output: undef on error, integer $part_id on success.
2972:
2973: =item C<&get_part()>
2974:
2975: Get the string describing a part from the MySQL id of the problem part.
2976:
2977: Input: $part_id
2978:
2979: Output: undef on error, $part string on success.
2980:
2981: =item C<&get_symb_id()>
2982:
2983: Get the MySQL id of a symb.
2984:
2985: Input: $symb
2986:
2987: Output: undef on error, integer $symb_id on success.
2988:
2989: =item C<&get_symb()>
2990:
2991: Get the symb associated with a MySQL symb_id.
2992:
2993: Input: $symb_id
2994:
2995: Output: undef on error, $symb on success.
2996:
2997: =item C<&get_student_id()>
2998:
2999: Get the MySQL id of a student.
3000:
3001: Input: $sname, $dom
3002:
3003: Output: undef on error, integer $student_id on success.
3004:
3005: =item C<&get_student()>
3006:
3007: Get student username:domain associated with the MySQL student_id.
3008:
3009: Input: $student_id
3010:
3011: Output: undef on error, string $student (username:domain) on success.
3012:
3013: =item C<&clear_internal_caches()>
3014:
3015: Causes the internal caches used in get_student_id, get_student,
3016: get_symb_id, get_symb, get_part_id, and get_part to be undef'd.
3017:
3018: Needs to be called before the first operation with the MySQL database
3019: for a given Apache request.
3020:
3021: =item C<&update_full_student_data($sname,$sdom,$courseid)>
3022:
3023: Does a lonnet::dump on a student to populate the courses tables.
3024:
3025: Input: $sname, $sdom, $courseid
3026:
3027: Output: $returnstatus
3028:
3029: $returnstatus is a string describing any errors that occurred. 'okay' is the
3030: default.
3031:
3032: This subroutine loads a students data using lonnet::dump and inserts
3033: it into the MySQL database. The inserts are done on three tables,
3034: $fulldump_response_table, $fulldump_part_table, and $fulldump_timestamp_table.
3035: The INSERT calls are made directly by this subroutine, not through lonmysql
3036: because we do a 'bulk'insert which takes advantage of MySQLs non-SQL
3037: compliant INSERT command to insert multiple rows at a time.
3038: If anything has gone wrong during this process, $returnstatus is updated with
3039: a description of the error.
3040:
3041: Once the "fulldump" tables are updated, the tables used for chart and
3042: spreadsheet (which hold only the current state of the student on their
3043: homework, not historical data) are updated. If all updates have occurred
3044: successfully, $student_table is updated to reflect the time of the update.
3045:
3046: Notice we do not insert the data and immediately query it. This means it
3047: is possible for there to be data returned this first time that is not
3048: available the second time. CYA.
3049:
3050:
3051: =item C<&update_student_data()>
3052:
3053: Input: $sname, $sdom, $courseid
3054:
3055: Output: $returnstatus, \%student_data
3056:
3057: $returnstatus is a string describing any errors that occurred. 'okay' is the
3058: default.
3059: \%student_data is the data returned by a call to lonnet::currentdump.
3060:
3061: This subroutine loads a students data using lonnet::currentdump and inserts
3062: it into the MySQL database. The inserts are done on two tables,
3063: $performance_table and $parameters_table. $parameters_table holds the data
3064: that is not included in $performance_table. See the description of
3065: $performance_table elsewhere in this file. The INSERT calls are made
3066: directly by this subroutine, not through lonmysql because we do a 'bulk'
3067: insert which takes advantage of MySQLs non-SQL compliant INSERT command to
3068: insert multiple rows at a time. If anything has gone wrong during this
3069: process, $returnstatus is updated with a description of the error and
3070: \%student_data is returned.
3071:
3072: Notice we do not insert the data and immediately query it. This means it
3073: is possible for there to be data returned this first time that is not
3074: available the second time. CYA.
3075:
3076: =item &ensure_tables_are_set_up($courseid)
3077:
3078: Checks to be sure the MySQL tables for the given class are set up.
3079: If $courseid is omitted it will be obtained from the environment.
3080:
3081: Returns nothing on success and 'error' on failure
3082:
3083:
3084: =item C<&ensure_current_data()>
3085:
3086: Input: $sname, $sdom, $courseid
3087:
3088: Output: $status, $data
3089:
3090: This routine ensures the data for a given student is up to date.
3091: The $student_table is queried to determine the time of the last update.
3092: If the students data is out of date, &update_student_data() is called.
3093: The return values from the call to &update_student_data() are returned.
3094:
3095: =item C<&ensure_current_full_data($sname,$sdom,$courseid)>
3096:
3097: Input: $sname, $sdom, $courseid
3098:
3099: Output: $status
3100:
3101: This routine ensures the fulldata (the data from a lonnet::dump, not a
3102: lonnet::currentdump) for a given student is up to date.
3103: The $student_table is queried to determine the time of the last update.
3104: If the students fulldata is out of date, &update_full_student_data() is
3105: called.
3106:
3107: The return value from the call to &update_full_student_data() is returned.
3108:
3109: =item C<&get_student_data_from_performance_cache()>
3110:
3111: Input: $sname, $sdom, $symb, $courseid
3112:
3113: Output: hash reference containing the data for the given student.
3114: If $symb is undef, all the students data is returned.
3115:
3116: This routine is the heart of the local caching system. See the description
3117: of $performance_table, $symb_table, $student_table, and $part_table. The
3118: main task is building the MySQL request. The tables appear in the request
3119: in the order in which they should be parsed by MySQL. When searching
3120: on a student the $student_table is used to locate the 'student_id'. All
3121: rows in $performance_table which have a matching 'student_id' are returned,
3122: with data from $part_table and $symb_table which match the entries in
3123: $performance_table, 'part_id' and 'symb_id'. When searching on a symb,
3124: the $symb_table is processed first, with matching rows grabbed from
3125: $performance_table and filled in from $part_table and $student_table in
3126: that order.
3127:
3128: Running 'EXPLAIN ' on the 'SELECT' statements generated can be quite
3129: interesting, especially if you play with the order the tables are listed.
3130:
3131:
3132: =item C<&get_current_state()>
3133:
3134: Input: $sname,$sdom,$symb,$courseid
3135:
3136: Output: Described below
3137:
3138: Retrieve the current status of a students performance. $sname and
3139: $sdom are the only required parameters. If $symb is undef the results
3140: of an &Apache::lonnet::currentdump() will be returned.
3141: If $courseid is undef it will be retrieved from the environment.
3142:
3143: The return structure is based on &Apache::lonnet::currentdump. If
3144: $symb is unspecified, all the students data is returned in a hash of
3145: the form:
3146: (
3147: symb1 => { param1 => value1, param2 => value2 ... },
3148: symb2 => { param1 => value1, param2 => value2 ... },
3149: )
3150:
3151: If $symb is specified, a hash of
3152: (
3153: param1 => value1,
3154: param2 => value2,
3155: )
3156: is returned.
3157:
3158: If no data is found for $symb, or if the student has no performance data,
3159: an empty list is returned.
3160:
3161: =item C<&get_problem_statistics()>
3162:
3163: Gather data on a given problem. The database is assumed to be
3164: populated and all local caching variables are assumed to be set
3165: properly. This means you need to call &ensure_current_data for
3166: the students you are concerned with prior to calling this routine.
3167:
3168: Inputs: $Sections, Groups, $status, $symb, $part, $courseid, $starttime,
3169: $endtime
3170:
3171: =over 4
3172:
3173: =item $Sections Array ref containing section names for students.
3174: 'all' is allowed to be the first (and only) item in the array.
3175:
3176: =item $Groups Array ref containing group names for students.
3177: 'all' is allowed to be the first (and only) item in the array.
3178:
3179: =item $status String describing the status of students
3180:
3181: =item $symb is the symb for the problem.
3182:
3183: =item $part is the part id you need statistics for
3184:
3185: =item $courseid is the course id, of course!
3186:
3187: =item $starttime and $endtime are unix times which to use to limit
3188: the statistical data.
3189:
3190: =back
3191:
3192: Outputs: See the code for up to date information. A hash reference is
3193: returned. The hash has the following keys defined:
3194:
3195: =over 4
3196:
3197: =item * num_students
3198:
3199: The number of students attempting the problem
3200:
3201: =item tries
3202:
3203: The total number of tries for the students
3204:
3205: =item max_tries
3206:
3207: The maximum number of tries taken
3208:
3209: =item mean_tries
3210:
3211: The average number of tries
3212:
3213: =item num_solved T
3214:
3215: he number of students able to solve the problem
3216:
3217: =item num_override
3218:
3219: The number of students whose answer is 'correct_by_override'
3220:
3221: =item deg_of_diff
3222:
3223: The degree of difficulty of the problem
3224:
3225: =item std_tries
3226:
3227: The standard deviation of the number of tries
3228:
3229: =item skew_tries
3230:
3231: The skew of the number of tries
3232:
3233: =item per_wrong
3234:
3235: The number of students attempting the problem who were not
3236: able to answer it correctly.
3237:
3238: =back
3239:
3240: =item C<&populate_weight_table()>
3241:
3242: =item C<&limit_by_start_end_times()>
3243:
3244: Build SQL WHERE condition which limits the data collected by the start
3245: and end times provided
3246:
3247: Inputs: $starttime, $endtime, $table
3248:
3249: Returns: $time_limits
3250:
3251:
3252: =item C<&limit_by_section_and_status()C>
3253:
3254: Build SQL WHERE condition which limits the data collected by section and
3255: student status.
3256:
3257: Inputs: $Sections (array ref)
3258: $enrollment (string: 'any', 'expired', 'active')
3259: $tablename The name of the table that holds the student data
3260:
3261: Returns: $student_requirements,$enrollment_requirements
3262:
3263: =item C<&limit_by_group()>
3264:
3265: Build SQL LEFT JOIN statement to include students_groups and groupnames tables and SQL WHERE condition which limits the data collected by group.
3266:
3267: Inputs: $Groups (array ref)
3268: $stutable The name of the table which holds the student data.
3269: $grptable The name of the table which maps group_id to groupname.
3270: $stugrptab The name of the table which holds student group affiliations.
3271: Returns: $groups_join,$group_limits
3272: $groups_join JOIN part of SQL statement (to include group related tables)
3273: $group_limits SQL WHERE condition limiting to requested groups
3274:
3275: =item C<rank_students_by_scores_on_resources()>
3276:
3277: Inputs:
3278: $resources: array ref of hash ref. Each hash ref needs key 'symb'.
3279: $Sections: array ref of sections to include,
3280: $Groups: array ref of groups to include.
3281: $enrollment: string,
3282: $courseid (may be omitted)
3283: $starttime (may be omitted)
3284: $endtime (may be omitted)
3285: $has_award_for (may be omitted)
3286:
3287: Returns; An array of arrays. The sub arrays contain a student name and
3288: their score on the resources. $starttime and $endtime constrain the
3289: list to awards obtained during the given time limits. $has_score_on
3290: constrains the list to those students who at least attempted the
3291: resource identified by the given symb, which is used to filter out
3292: such students for statistics that would be adversely affected by such
3293: students.
3294:
3295: =item C<&get_sum_of_scores>
3296:
3297: Inputs: $resource (hash ref, needs {'symb'} key),
3298: $part, (the part id),
3299: $students (array ref, contents of array are scalars holding 'sname:sdom'),
3300: $courseid
3301:
3302: Returns: the sum of the score on the problem part over the students and the
3303: maximum possible value for the sum (taken from the weight table).
3304:
3305:
3306: =item C<&score_stats()>
3307:
3308: Inputs: $Sections, $enrollment, $symbs, $starttime,
3309: $endtime, $courseid
3310:
3311: $Sections, $enrollment, $starttime, $endtime, and $courseid are the same as
3312: elsewhere in this module.
3313: $symbs is an array ref of symbs
3314:
3315: Returns: minimum, maximum, mean, s.d., number of students, and maximum
3316: possible of student scores on the given resources
3317:
3318: =item C<&count_stats()>
3319:
3320: Inputs: $Sections, $Groups, $enrollment, $symbs, $starttime,
3321: $endtime, $courseid
3322:
3323: $Sections, $Groups $enrollment, $starttime, $endtime, and $courseid are the
3324: same as elsewhere in this module.
3325: $symbs is an array ref of symbs
3326:
3327: Returns: minimum, maximum, mean, s.d., and number of students
3328: of the number of items correct on the given resources
3329:
3330: =item C<get_student_data()>
3331:
3332: =item C<&get_student_scores($Sections,$Groups,$Symbs,$enrollment,$courseid)>
3333:
3334: =item C<&setup_table_names()>
3335:
3336: input: course id
3337:
3338: output: none
3339:
3340: =back
3341:
3342: =head3 End of Local Data Caching Subroutines
3343:
3344: =head3 Classlist Subroutines
3345:
3346: =over
3347:
3348: =item &get_classlist();
3349:
3350: Retrieve the classist of a given class or of the current class. Student
3351: information is returned from the classlist.db file and, if needed,
3352: from the students environment.
3353:
3354: Optional arguments are $cdom, and $cnum (course domain,
3355: and course number, respectively). If either is ommitted the course
3356: will be taken from the current environment ($env{'request.course.id'},
3357: $env{'course.'.$cid.'.domain'}, and $env{'course.'.$cid.'.num'}).
3358:
3359: Returns a reference to a hash which contains:
3360: keys '$sname:$sdom'
3361: values [$sdom,$sname,$end,$start,$id,$section,$fullname,$status,$type,
3362: $lockedtype,$credits,$instsec]
3363:
3364: The constant values CL_SDOM, CL_SNAME, CL_END, etc. can be used
3365: as indices into the returned list to future-proof clients against
3366: changes in the list order.
3367:
3368: =back
3369:
3370: =cut
3371:
3372:
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