1: # The LearningOnline Network with CAPA
2: #
3: # $Id: loncoursedata.pm,v 1.209 2023/11/04 00:06:00 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: my $requested_max_packet = 0;
781: my $max_allowed_packet;
782:
783: sub update_full_student_data {
784: my ($sname,$sdom,$courseid) = @_;
785: #
786: # Set up database names
787: &setup_table_names($courseid);
788: #
789: my $student_id = &get_student_id($sname,$sdom);
790: my $student = $sname.':'.$sdom;
791: #
792: my $returnstatus = 'okay';
793: #
794: # Download students data
795: my $time_of_retrieval = time;
796: my @tmp = &Apache::lonnet::dumpstore($courseid,$sdom,$sname);
797: if (@tmp && $tmp[0] =~ /^error/) {
798: $returnstatus = 'error retrieving full student data';
799: return $returnstatus;
800: } elsif (! @tmp) {
801: $returnstatus = 'okay: no student data';
802: return $returnstatus;
803: }
804: my %studentdata = @tmp;
805: #
806: # Get database handle and clean out the tables
807: my $dbh = &Apache::lonmysql::get_dbh();
808: $dbh->do('DELETE FROM '.$fulldump_response_table.' WHERE student_id='.
809: $student_id);
810: $dbh->do('DELETE FROM '.$fulldump_part_table.' WHERE student_id='.
811: $student_id);
812: $dbh->do('DELETE FROM '.$fulldump_timestamp_table.' WHERE student_id='.
813: $student_id);
814: #
815: # Parse and store the data into a form we can handle
816: my $partdata;
817: my $respdata;
818: while (my ($key,$value) = each(%studentdata)) {
819: next if ($key =~ /^(\d+):(resource$|subnum$|keys:)/);
820: my ($transaction,$symb,$parameter) = split(':',$key);
821: $symb = &unescape($symb);
822: $parameter = &unescape($parameter);
823: my $symb_id = &get_symb_id($symb);
824: if ($parameter eq 'timestamp') {
825: # We can deal with 'timestamp' right away
826: my @timestamp_storage = ($symb_id,$student_id,
827: $transaction,$value);
828: my $store_command = 'INSERT IGNORE INTO '.$fulldump_timestamp_table.
829: " VALUES ('".join("','",@timestamp_storage)."');";
830: $dbh->do($store_command);
831: if ($dbh->err()) {
832: &Apache::lonnet::logthis('unable to execute '.$store_command);
833: &Apache::lonnet::logthis($dbh->errstr());
834: }
835: next;
836: } elsif ($parameter eq 'version') {
837: next;
838: } elsif (&symb_is_for_task($symb)) {
839: next if ($parameter !~ /^resource\.(.*)\.(award|
840: awarded|
841: solved|
842: submission|
843: portfiles|
844: status|
845: version|
846: regrader)\s*$/x);
847: my ($version_and_part_id, $field) = ($1,$2);
848:
849: next if ($version_and_part_id !~ /\./
850: && $field ne 'regrader' && $field ne 'version');
851:
852: my ($version, $part, $instance) =
853: split(/\./,$version_and_part_id);
854:
855: #skip and instance dimension or criteria specific data
856: next if (defined($instance)
857: && $instance ne $field
858: && $instance ne 'bridgetask');
859:
860: if (!defined($part)) {
861: $part = $version;
862: }
863: my $resp_id = &get_part_id('0');
864: my $part_id = &get_part_id($part);
865:
866: if ($field eq 'version') {
867: # for tasks each version is an attempt at it thus
868: # version -> tries
869: $partdata->{$symb_id}{$part_id}{$transaction}{'tries'}=
870: $value;
871: # at new version time the record gets reset thus adding a
872: # virtual response awarddetail of 'new_version'
873: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific'}='status';
874: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific_value'}='new_version';
875:
876: } elsif ($field eq 'award' || $field eq 'awarded'
877: || $field eq 'solved') {
878: $partdata->{$symb_id}{$part_id}{$transaction}{$field}=
879: $value;
880: } elsif ($field eq 'portfiles') {
881: # tasks only accepts portfolio submissions
882: $value = $dbh->quote($value);
883: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'submission'}=$value;
884: } elsif ($field eq 'status') {
885: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific'}=$field;
886: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific_value'}=$value;
887: } elsif ($field eq 'regrader') {
888: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific_2'}=$field;
889: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific_value_2'}=$value;
890: }
891: } elsif ($parameter =~ /^resource\.(.*)\.(tries|
892: award|
893: awarded|
894: previous|
895: solved|
896: awarddetail|
897: submission|
898: submissiongrading|
899: molecule)\s*$/x){
900: # we do not have enough information to store an
901: # entire row, so we save it up until later.
902: my ($part_and_resp_id,$field) = ($1,$2);
903: my ($part,$part_id,$resp,$resp_id);
904: if ($part_and_resp_id =~ /\./) {
905: ($part,$resp) = split(/\./,$part_and_resp_id);
906: $part_id = &get_part_id($part);
907: $resp_id = &get_part_id($resp);
908: } else {
909: $part_id = &get_part_id($part_and_resp_id);
910: }
911: # Deal with part specific data
912: if ($field =~ /^(tries|award|awarded|previous)$/) {
913: $partdata->{$symb_id}->{$part_id}->{$transaction}->{$field}=$value;
914: }
915: # deal with response specific data
916: if (defined($resp_id) &&
917: $field =~ /^(awarddetail|
918: submission|
919: submissiongrading|
920: molecule)$/x) {
921: if ($field eq 'submission') {
922: # We have to be careful with user supplied input.
923: # most of the time we are okay because it is escaped.
924: # However, there is one wrinkle: submissions which end in
925: # and odd number of '\' cause insert errors to occur.
926: # Best trap this somehow...
927: $value = $dbh->quote($value);
928: }
929: if ($field eq 'submissiongrading' ||
930: $field eq 'molecule') {
931: $respdata->{$symb_id}->{$part_id}->{$resp_id}->{$transaction}->{'response_specific'}=$field;
932: $respdata->{$symb_id}->{$part_id}->{$resp_id}->{$transaction}->{'response_specific_value'}=$value;
933: } else {
934: $respdata->{$symb_id}->{$part_id}->{$resp_id}->{$transaction}->{$field}=$value;
935: }
936: }
937: }
938: }
939: ##
940: ## Store the part data
941: my $store_command = 'INSERT IGNORE INTO '.$fulldump_part_table.
942: ' VALUES '."\n";
943: my $store_rows = 0;
944: while (my ($symb_id,$hash1) = each (%$partdata)) {
945: while (my ($part_id,$hash2) = each (%$hash1)) {
946: while (my ($transaction,$data) = each (%$hash2)) {
947: $store_command .= "('".join("','",$symb_id,$part_id,
948: $student_id,
949: $transaction,
950: $data->{'tries'},
951: $data->{'award'},
952: $data->{'awarded'},
953: $data->{'previous'})."'),";
954: $store_rows++;
955: }
956: }
957: }
958: if ($store_rows) {
959: chop($store_command);
960: $dbh->do($store_command);
961: if ($dbh->err) {
962: $returnstatus = 'error saving part data';
963: &Apache::lonnet::logthis('insert error '.$dbh->errstr());
964: &Apache::lonnet::logthis("While attempting\n".$store_command);
965: }
966: }
967: ##
968: ## Store the response data
969: my $store_prefix = 'INSERT IGNORE INTO '.$fulldump_response_table.
970: ' VALUES '."\n";
971: $store_rows = 0;
972: unless ($requested_max_packet) {
973: (undef,$max_allowed_packet) = $dbh->selectrow_array(
974: qq{show variables LIKE ? },
975: undef,
976: "max_allowed_packet");
977: if ($max_allowed_packet !~ /^\d+$/) {
978: $max_allowed_packet = '';
979: }
980: $requested_max_packet = 1;
981: }
982: my @store_values = ();
983: my $curr_values = '';
984: my $curr_length = 0;
985: my ($max_values);
986: if ($max_allowed_packet) {
987: $max_values = $max_allowed_packet - length($store_prefix);
988: }
989: while (my ($symb_id,$hash1) = each (%$respdata)) {
990: while (my ($part_id,$hash2) = each (%$hash1)) {
991: while (my ($resp_id,$hash3) = each (%$hash2)) {
992: while (my ($transaction,$data) = each (%$hash3)) {
993: my $submission = $data->{'submission'};
994: # We have to be careful with user supplied input.
995: # most of the time we are okay because it is escaped.
996: # However, there is one wrinkle: submissions which end in
997: # and odd number of '\' cause insert errors to occur.
998: # Best trap this somehow...
999: $submission = $dbh->quote($submission);
1000: my $sql_values = "('".
1001: join("','",$symb_id,$part_id,
1002: $resp_id,$student_id,
1003: $transaction,
1004: $data->{'awarddetail'},
1005: $data->{'response_specific'},
1006: $data->{'response_specific_value'},
1007: $data->{'response_specific_2'},
1008: $data->{'response_specific_value_2'})."',";
1009: if ($max_values) {
1010: my $length = length($sql_values) + length($submission."),");
1011: if ($length > $max_values) {
1012: &Apache::lonnet::logthis("SQL responsedata insert for student: $sname would exceed max_allowed_packet size");
1013: &Apache::lonnet::logthis("symb_id: $symb_id, part_id: $part_id, resp_id: $resp_id");
1014: &Apache::lonnet::logthis("You may want to increase the max_allowed_packet size from the current: $max_allowed_packet");
1015: $sql_values .= $dbh->quote('WARNING: Submission too large -- see grading interface for actual submission')."),";
1016: $length = length($sql_values);
1017: &Apache::lonnet::logthis("Placeholder inserted instead of value of actual submission");
1018: &Apache::lonnet::logthis("See grading interface for the actual submission");
1019: } else {
1020: $sql_values .= $submission."),";
1021: }
1022: if ($length + $curr_length > $max_values) {
1023: push(@store_values,$curr_values);
1024: $curr_values = $sql_values;
1025: $curr_length = $length;
1026: } else {
1027: $curr_values .= $sql_values;
1028: $curr_length += $length;
1029: }
1030: } else {
1031: $curr_values .= $sql_values.$submission."),";
1032: }
1033: $store_rows++;
1034: }
1035: }
1036: }
1037: }
1038: if ($store_rows) {
1039: if ($curr_values ne '') {
1040: push(@store_values,$curr_values);
1041: }
1042: foreach my $item (@store_values) {
1043: chop($item);
1044: if ($item ne '') {
1045: $dbh->do($store_prefix.$item);
1046: if ($dbh->err) {
1047: $returnstatus = 'error saving response data';
1048: &Apache::lonnet::logthis('insert error '.$dbh->errstr());
1049: &Apache::lonnet::logthis("While attempting\n".$store_prefix.$item);
1050: last;
1051: }
1052: }
1053: }
1054: }
1055: ##
1056: ## Update the students "current" data in the performance
1057: ## and parameters tables.
1058: my ($status,undef) = &store_student_data
1059: ($sname,$sdom,$courseid,
1060: &Apache::lonnet::convert_dump_to_currentdump(\%studentdata));
1061: if ($returnstatus eq 'okay' && $status ne 'okay') {
1062: $returnstatus = 'error saving current data:'.$status;
1063: } elsif ($status ne 'okay') {
1064: $returnstatus .= ' error saving current data:'.$status;
1065: }
1066: ##
1067: ## Update the students time......
1068: if ($returnstatus eq 'okay') {
1069: &store_updatetime($student_id,$time_of_retrieval,$time_of_retrieval);
1070: if ($dbh->err) {
1071: if ($returnstatus eq 'okay') {
1072: $returnstatus = 'error updating student time';
1073: } else {
1074: $returnstatus = 'error updating student time';
1075: }
1076: }
1077: }
1078: return $returnstatus;
1079: }
1080:
1081:
1082: sub update_student_data {
1083: my ($sname,$sdom,$courseid) = @_;
1084: #
1085: # Set up database names
1086: &setup_table_names($courseid);
1087: #
1088: my $student_id = &get_student_id($sname,$sdom);
1089: my $student = $sname.':'.$sdom;
1090: #
1091: my $returnstatus = 'okay';
1092: #
1093: # Download students data
1094: my $time_of_retrieval = time;
1095: my %student_data = &Apache::lonnet::currentdump($courseid,$sdom,$sname);
1096: if (&Apache::lonnet::error(%student_data)) {
1097: &Apache::lonnet::logthis('error getting data for '.
1098: $sname.':'.$sdom.' in course '.$courseid.
1099: ':'.(%student_data)[0]);
1100: $returnstatus =(%student_data)[0] ;
1101: return ($returnstatus,undef);
1102: }
1103: if (scalar(keys(%student_data)) < 1) {
1104: return ('no data',undef);
1105: }
1106: my @Results = &store_student_data($sname,$sdom,$courseid,\%student_data);
1107: #
1108: # Set the students update time
1109: if ($Results[0] eq 'okay') {
1110: &store_updatetime($student_id,$time_of_retrieval);
1111: }
1112: #
1113: return @Results;
1114: }
1115:
1116: sub store_updatetime {
1117: my ($student_id,$updatetime,$fullupdatetime)=@_;
1118: my $values = '';
1119: if (defined($updatetime)) {
1120: $values = 'updatetime='.$updatetime.' ';
1121: }
1122: if (defined($fullupdatetime)) {
1123: if ($values ne '') {
1124: $values .= ',';
1125: }
1126: $values .= 'fullupdatetime='.$fullupdatetime.' ';
1127: }
1128: return if ($values eq '');
1129: my $dbh = &Apache::lonmysql::get_dbh();
1130: my $request = 'UPDATE '.$student_table.' SET '.$values.
1131: ' WHERE student_id='.$student_id.' LIMIT 1';
1132: $dbh->do($request);
1133: }
1134:
1135: sub store_student_data {
1136: my ($sname,$sdom,$courseid,$student_data) = @_;
1137: #
1138: my $student_id = &get_student_id($sname,$sdom);
1139: my $student = $sname.':'.$sdom;
1140: #
1141: my $returnstatus = 'okay';
1142: #
1143: # Remove all of the students data from the table
1144: my $dbh = &Apache::lonmysql::get_dbh();
1145: $dbh->do('DELETE FROM '.$performance_table.' WHERE student_id='.
1146: $student_id);
1147: $dbh->do('DELETE FROM '.$parameters_table.' WHERE student_id='.
1148: $student_id);
1149: #
1150: # Store away the data
1151: #
1152: my $starttime = Time::HiRes::time;
1153: my $elapsed = 0;
1154: my $rows_stored;
1155: my $store_parameters_prefix = 'INSERT IGNORE INTO '.$parameters_table.
1156: ' VALUES '."\n";
1157: my $num_parameters = 0;
1158: my $store_performance_prefix = 'INSERT IGNORE INTO '.$performance_table.
1159: ' VALUES '."\n";
1160: return ('error',undef) if (! defined($dbh));
1161: unless ($requested_max_packet) {
1162: (undef,$max_allowed_packet) = $dbh->selectrow_array(
1163: qq{show variables LIKE ? },
1164: undef,
1165: "max_allowed_packet");
1166: if ($max_allowed_packet !~ /^\d+$/) {
1167: $max_allowed_packet = '';
1168: }
1169: $requested_max_packet = 1;
1170: }
1171: my @store_parameters_values = ();
1172: my $curr_params_values = '';
1173: my $curr_params_length = 0;
1174: my @store_performance_values = ();
1175: my $curr_perf_values = '';
1176: my $curr_perf_length = 0;
1177: my ($max_param,$max_perf);
1178: if ($max_allowed_packet) {
1179: $max_param = $max_allowed_packet - length($store_parameters_prefix);
1180: $max_perf = $max_allowed_packet - length($store_performance_prefix);
1181: }
1182: while (my ($current_symb,$param_hash) = each(%{$student_data})) {
1183: #
1184: # make sure the symb is set up properly
1185: my $symb_id = &get_symb_id($current_symb);
1186: #
1187: # Parameters
1188: while (my ($parameter,$value) = each(%$param_hash)) {
1189: if ($parameter !~ /(timestamp|resource\.(.*)\.(solved|tries|awarded|award|awarddetail|previous))/) {
1190: my $sql_parameter = "('".join("','",
1191: $symb_id,$student_id,
1192: $parameter)."',".
1193: $dbh->quote($value)."),\n";
1194: if ($sql_parameter !~ /''/) {
1195: if ($max_param) {
1196: my $length = length($sql_parameter);
1197: if ($length > $max_param) {
1198: &Apache::lonnet::logthis("SQL parameter insert for student: $sname for parameter: $parameter would exceed max_allowed_packet size");
1199: &Apache::lonnet::logthis("symb_id: $symb_id");
1200: &Apache::lonnet::logthis("You may want to increase the max_allowed_packet size from the current: $max_allowed_packet");
1201: if ($parameter =~ /\.submission$/) {
1202: $sql_parameter = "('".join("','",
1203: $symb_id,$student_id,
1204: $parameter)."',".
1205: $dbh->quote('WARNING: Submission too large -- see grading interface for actual submission')."),\n";
1206: $length = length($sql_parameter);
1207: &Apache::lonnet::logthis("Placeholder inserted instead of value of actual submission");
1208: &Apache::lonnet::logthis("See grading interface for the actual submission");
1209: } else {
1210: &Apache::lonnet::logthis("Skipping this item");
1211: next;
1212: }
1213: }
1214: if ($length + $curr_params_length > $max_param) {
1215: push(@store_parameters_values,$curr_params_values);
1216: $curr_params_values = $sql_parameter;
1217: $curr_params_length = $length;
1218: } else {
1219: $curr_params_values .= $sql_parameter;
1220: $curr_params_length += $length;
1221: }
1222: } else {
1223: $curr_params_values .= $sql_parameter;
1224: }
1225: #$rows_stored++;
1226: $num_parameters ++;
1227: }
1228: }
1229: }
1230: # Performance
1231: my %stored;
1232: while (my ($parameter,$value) = each(%$param_hash)) {
1233: next if ($parameter !~ /^resource\.(.*)\.(solved|awarded)$/);
1234: my $part = $1;
1235: my $which = $2;
1236: next if ($part =~ /\./);
1237: next if (exists($stored{$part}));
1238: $stored{$part}++;
1239: #
1240: my $part_id = &get_part_id($part);
1241: next if (!defined($part_id));
1242:
1243: my ($solved,$awarded);
1244: if ($which eq 'solved') {
1245: $solved = $value;
1246: $awarded = $param_hash->{'resource.'.$part.'.awarded'};
1247: } else {
1248: $solved = $param_hash->{'resource.'.$part.'.solved'};
1249: $awarded = $value;
1250: }
1251: my $award = $param_hash->{'resource.'.$part.'.award'};
1252: my $awarddetail = $param_hash->{'resource.'.$part.'.awarddetail'};
1253: my $timestamp = $param_hash->{'timestamp'};
1254: my $tries = $param_hash->{'resource.'.$part.'.tries'};
1255: if (&symb_is_for_task($current_symb)) {
1256: $tries = $param_hash->{'resource.'.$part.'.version'};
1257: }
1258: #
1259: $solved = '' if (! defined($solved));
1260: $tries = '' if (! defined($tries));
1261: $awarded = '' if (! defined($awarded));
1262: $award = '' if (! defined($award));
1263: $awarddetail = '' if (! defined($awarddetail));
1264: my $sql_performance =
1265: "('".join("','",$symb_id,$student_id,$part_id,$part,
1266: $solved,$tries,$awarded,$award,
1267: $awarddetail,$timestamp)."'),\n";
1268: if ($max_perf) {
1269: my $length = length($sql_performance);
1270: if ($length > $max_perf) {
1271: &Apache::lonnet::logthis("SQL performance insert for student: $sname would exceed max_allowed_packet size");
1272: &Apache::lonnet::logthis("symb_id: $symb_id");
1273: &Apache::lonnet::logthis("Skipping this item. You may want to increase the max_allowed_packet size from the current: $max_allowed_packet");
1274: next;
1275: } else {
1276: if ($length + $curr_perf_length > $max_perf) {
1277: push(@store_performance_values,$curr_perf_values);
1278: $curr_perf_values = $sql_performance;
1279: $curr_perf_length = $length;
1280: } else {
1281: $curr_perf_values .= $sql_performance;
1282: $curr_perf_length += $length;
1283: }
1284: }
1285: } else {
1286: $curr_perf_values .= $sql_performance;
1287: }
1288: $rows_stored++;
1289: }
1290: }
1291: if ($curr_params_values ne '') {
1292: push(@store_parameters_values,$curr_params_values);
1293: }
1294: if ($curr_perf_values ne '') {
1295: push(@store_performance_values,$curr_perf_values);
1296: }
1297: if (! $rows_stored) { return ($returnstatus, undef); }
1298: my $start = Time::HiRes::time;
1299: foreach my $item (@store_performance_values) {
1300: $item =~ s|,\n$||;
1301: if ($item ne '') {
1302: $dbh->do($store_performance_prefix.$item);
1303: if ($dbh->err()) {
1304: &Apache::lonnet::logthis('performance insert error:'.
1305: $dbh->errstr());
1306: &Apache::lonnet::logthis('command = '.$/.$store_performance_prefix.$item);
1307: $returnstatus = 'error: unable to insert performance into database';
1308: return ($returnstatus,$student_data);
1309: }
1310: }
1311: }
1312: if ($num_parameters > 0) {
1313: foreach my $item (@store_parameters_values) {
1314: $item =~ s|,\n$||;
1315: if ($item ne '') {
1316: $dbh->do($store_parameters_prefix.$item);
1317: if ($dbh->err()) {
1318: &Apache::lonnet::logthis('parameters insert error:'.
1319: $dbh->errstr());
1320: &Apache::lonnet::logthis('command = '.$/.$store_parameters_prefix.$item);
1321: &Apache::lonnet::logthis('rows_stored = '.$rows_stored);
1322: &Apache::lonnet::logthis('student_id = '.$student_id);
1323: $returnstatus = 'error: unable to insert parameters into database';
1324: return ($returnstatus,$student_data);
1325: }
1326: }
1327: }
1328: }
1329: $elapsed += Time::HiRes::time - $start;
1330: return ($returnstatus,$student_data);
1331: }
1332:
1333:
1334: sub ensure_tables_are_set_up {
1335: my ($courseid) = @_;
1336: $courseid = $env{'request.course.id'} if (! defined($courseid));
1337: #
1338: # Clean out package variables
1339: &setup_table_names($courseid);
1340: #
1341: # if the tables do not exist, make them
1342: my @CurrentTable = &Apache::lonmysql::tables_in_db();
1343: my ($found_symb,$found_student,$found_groups,$found_groupnames,$found_part,
1344: $found_performance,$found_parameters,$found_fulldump_part,
1345: $found_fulldump_response,$found_fulldump_timestamp,
1346: $found_weight);
1347: foreach (@CurrentTable) {
1348: $found_symb = 1 if ($_ eq $symb_table);
1349: $found_student = 1 if ($_ eq $student_table);
1350: $found_groups = 1 if ($_ eq $students_groups_table);
1351: $found_groupnames = 1 if ($_ eq $groupnames_table);
1352: $found_part = 1 if ($_ eq $part_table);
1353: $found_performance = 1 if ($_ eq $performance_table);
1354: $found_parameters = 1 if ($_ eq $parameters_table);
1355: $found_fulldump_part = 1 if ($_ eq $fulldump_part_table);
1356: $found_fulldump_response = 1 if ($_ eq $fulldump_response_table);
1357: $found_fulldump_timestamp = 1 if ($_ eq $fulldump_timestamp_table);
1358: $found_weight = 1 if ($_ eq $weight_table);
1359: }
1360: if (!$found_symb ||
1361: !$found_student || !$found_part ||
1362: !$found_performance || !$found_parameters ||
1363: !$found_fulldump_part || !$found_fulldump_response ||
1364: !$found_fulldump_timestamp || !$found_weight ) {
1365: if (&init_dbs($courseid,1)) {
1366: return 'error';
1367: }
1368: }
1369: }
1370:
1371: sub ensure_current_data {
1372: my ($sname,$sdom,$courseid) = @_;
1373: my $status = 'okay'; # return value
1374: #
1375: $courseid = $env{'request.course.id'} if (! defined($courseid));
1376: &ensure_tables_are_set_up($courseid);
1377: #
1378: # Get the update time for the user
1379: my $updatetime = 0;
1380: my $getuserdir = 1;
1381: my $modifiedtime = &Apache::lonnet::GetFileTimestamp
1382: ($sdom,$sname,$courseid.'.db',$getuserdir);
1383: #
1384: if ($modifiedtime == -1) {
1385: return ('no data',undef);
1386: }
1387:
1388: my $student_id = &get_student_id($sname,$sdom);
1389: &get_students_groupids($student_id);
1390: my @Result = &Apache::lonmysql::get_rows($student_table,
1391: "student_id ='$student_id'");
1392: my $data = undef;
1393: if (@Result) {
1394: $updatetime = $Result[0]->[6]; # Ack! This is dumb!
1395: }
1396: if ($modifiedtime > $updatetime) {
1397: ($status,$data) = &update_student_data($sname,$sdom,$courseid);
1398: }
1399: return ($status,$data);
1400: }
1401:
1402:
1403: sub ensure_current_full_data {
1404: my ($sname,$sdom,$courseid) = @_;
1405: my $status = 'okay'; # return value
1406: #
1407: $courseid = $env{'request.course.id'} if (! defined($courseid));
1408: &ensure_tables_are_set_up($courseid);
1409: #
1410: # Get the update time for the user
1411: my $getuserdir = 1;
1412: my $modifiedtime = &Apache::lonnet::GetFileTimestamp
1413: ($sdom,$sname,$courseid.'.db',$getuserdir);
1414: #
1415: my $student_id = &get_student_id($sname,$sdom);
1416: &get_students_groupids($student_id);
1417: my @Result = &Apache::lonmysql::get_rows($student_table,
1418: "student_id ='$student_id'");
1419: my $updatetime;
1420: if (@Result && ref($Result[0]) eq 'ARRAY') {
1421: $updatetime = $Result[0]->[7];
1422: }
1423: if (! defined($updatetime) || $modifiedtime > $updatetime) {
1424: $status = &update_full_student_data($sname,$sdom,$courseid);
1425: }
1426: return $status;
1427: }
1428:
1429: sub ensure_current_groups {
1430: my ($courseid) = @_;
1431: my ($cdom,$cnum);
1432: if (defined($courseid)) {
1433: my %coursehash = &Apache::lonnet::coursedescription($courseid);
1434: $cdom = $coursehash{'domain'};
1435: $cnum = $coursehash{'num'};
1436: } elsif ($env{'request.course.id'}) {
1437: $courseid = $env{'request.course.id'};
1438: $cdom = $env{'course.'.$courseid.'.domain'};
1439: $cnum = $env{'course.'.$courseid.'.num'};
1440: }
1441: if ($cdom eq '' || $cnum eq '') {
1442: return 'error: invalid course';
1443: }
1444: &setup_table_names($courseid);
1445: my @CurrentTables = &Apache::lonmysql::tables_in_db();
1446: unless (grep(/^\Q$groupnames_table\E$/,@CurrentTables)) {
1447: return;
1448: }
1449: # Get the update time for the groupnames table
1450: my $getuserdir = 1;
1451: my $modifiedtime = &Apache::lonnet::GetFileTimestamp
1452: ($cdom,$cnum,'coursegroups.db',$getuserdir);
1453: my %tableinfo = &Apache::lonmysql::table_information($groupnames_table);
1454: my $updatetime;
1455: if ($tableinfo{'Update_time'}) {
1456: $updatetime = $tableinfo{'Update_time'};
1457: }
1458: if (! defined($updatetime) || $modifiedtime > $updatetime) {
1459: my (%groups_in_sql,%removegroups,$addgroup);
1460: my %curr_groups = &Apache::longroup::coursegroups($cdom,$cnum);
1461: my @Result = &Apache::lonmysql::get_rows($groupnames_table);
1462: foreach my $row (@Result) {
1463: my ($id,$name) = @{$row};
1464: unless (exists($curr_groups{$name})) {
1465: $groups_in_sql{$name}=$id;
1466: } elsif ($id) {
1467: $removegroups{$id} = $name;
1468: }
1469: }
1470: foreach my $group (keys(%curr_groups)) {
1471: unless (exists($groups_in_sql{$group})) {
1472: $addgroup = 1;
1473: last;
1474: }
1475: }
1476: if (keys(%removegroups)) {
1477: my $dbh = &Apache::lonmysql::get_dbh();
1478: foreach my $group_id (keys(%removegroups)) {
1479: my $command = 'DELETE FROM '.$groupnames_table.' WHERE group_id='.
1480: $group_id;
1481: $dbh->do($command);
1482: if ($dbh->err()) {
1483: &Apache::lonnet::logthis("error ".$dbh->errstr().
1484: " occurred executing \n".
1485: "SQL command: $command");
1486: }
1487: }
1488: }
1489: if ($addgroup) {
1490: &populate_groupnames_table($courseid);
1491: }
1492: }
1493: return;
1494: }
1495:
1496: sub ensure_current_students_groups {
1497: my ($courseid) = @_;
1498: my ($cdom,$cnum);
1499: if (defined($courseid)) {
1500: my %coursehash = &Apache::lonnet::coursedescription($courseid);
1501: $cdom = $coursehash{'domain'};
1502: $cnum = $coursehash{'num'};
1503: } elsif ($env{'request.course.id'}) {
1504: $courseid = $env{'request.course.id'};
1505: $cdom = $env{'course.'.$courseid.'.domain'};
1506: $cnum = $env{'course.'.$courseid.'.num'};
1507: }
1508: &setup_table_names($courseid);
1509: my @CurrentTables = &Apache::lonmysql::tables_in_db();
1510: unless (grep(/^\Q$students_groups_table\E$/,@CurrentTables)) {
1511: return;
1512: }
1513: # Get the update time for the groupnames table
1514: my $getuserdir = 1;
1515: my $modifiedtime = &Apache::lonnet::GetFileTimestamp
1516: ($cdom,$cnum,'groupmembership.db',$getuserdir);
1517: my %tableinfo = &Apache::lonmysql::table_information($students_groups_table);
1518: my $updatetime;
1519: if ($tableinfo{'Update_time'}) {
1520: $updatetime = $tableinfo{'Update_time'};
1521: }
1522: if ((!defined($updatetime)) || ($modifiedtime > $updatetime)) {
1523: if (&Apache::lonmysql::drop_table($students_groups_table)) {
1524: if (&init_dbs($courseid)) {
1525: return "error creating $students_groups_table\n";
1526: } else {
1527: &populate_students_groups_table($courseid);
1528: }
1529: }
1530: }
1531: return;
1532: }
1533:
1534: sub ensure_current_sections {
1535: my ($courseid) = @_;
1536: my ($cdom,$cnum);
1537: if (defined($courseid)) {
1538: my %coursehash = &Apache::lonnet::coursedescription($courseid);
1539: $cdom = $coursehash{'domain'};
1540: $cnum = $coursehash{'num'};
1541: } elsif ($env{'request.course.id'}) {
1542: $courseid = $env{'request.course.id'};
1543: $cdom = $env{'course.'.$courseid.'.domain'};
1544: $cnum = $env{'course.'.$courseid.'.num'};
1545: }
1546: &setup_table_names($courseid);
1547: my @CurrentTables = &Apache::lonmysql::tables_in_db();
1548: unless (grep(/^\Q$student_table\E$/,@CurrentTables)) {
1549: return;
1550: }
1551: # Get the update time for the student table
1552: my $getuserdir = 1;
1553: my $modifiedtime = &Apache::lonnet::GetFileTimestamp
1554: ($cdom,$cnum,'classlist.db',$getuserdir);
1555: my %tableinfo = &Apache::lonmysql::table_information($student_table);
1556: my $updatetime;
1557: if ($tableinfo{'Update_time'}) {
1558: $updatetime = $tableinfo{'Update_time'};
1559: }
1560: if ((!defined($updatetime)) || ($modifiedtime > $updatetime)) {
1561: &update_student_table($cdom,$cnum);
1562: }
1563: return;
1564: }
1565:
1566: sub update_student_table {
1567: my ($cdom,$cnum) = @_;
1568: return unless (($cdom ne '') && ($cnum ne ''));
1569: my (%roster,%sqldata);
1570: my $classlist = &get_classlist($cdom,$cnum);
1571: while (my ($student,$data) = each (%$classlist)) {
1572: my ($section,$start,$end) = ($data->[&CL_SECTION()],
1573: $data->[&CL_START()],
1574: $data->[&CL_END()]);
1575: if ($section eq '' || $section =~ /^\s*$/) {
1576: $section = 'none';
1577: }
1578: if ($start eq '') { $start = 0; }
1579: if ($end eq '') { $end = 0; }
1580: $roster{$student}{'section'} = $section;
1581: $roster{$student}{'start'} = $start;
1582: $roster{$student}{'end'} = $end;
1583: }
1584: my $dbh = &Apache::lonmysql::get_dbh();
1585: my $statement = "SELECT student_id,student,section,start,end FROM $student_table";
1586: my $sth = $dbh->prepare($statement);
1587: $sth->execute();
1588: if ($sth->err()) {
1589: &Apache::lonnet::logthis("Unable to execute MySQL request:");
1590: &Apache::lonnet::logthis("\n".$statement."\n");
1591: &Apache::lonnet::logthis("error is:".$sth->errstr());
1592: return undef;
1593: }
1594: foreach my $row (@{$sth->fetchall_arrayref}) {
1595: my ($id,$student,$section,$start,$end) = (@$row);
1596: if (ref($roster{$student}) eq 'HASH') {
1597: if (($roster{$student}{'section'} ne $section) ||
1598: ($roster{$student}{'start'} ne $start) ||
1599: ($roster{$student}{'end'} ne $end)) {
1600: $sqldata{$id} = {
1601: section => $roster{$student}{'section'},
1602: start => $roster{$student}{'start'},
1603: end => $roster{$student}{'end'},
1604: };
1605: }
1606: }
1607: }
1608: $sth->finish();
1609: if (keys(%sqldata)) {
1610: foreach my $id (sort { $a <=> $b } keys(%sqldata)) {
1611: my $request = "UPDATE $student_table SET section='$sqldata{$id}{section}'".
1612: ", start='$sqldata{$id}{start}'".
1613: ", end='$sqldata{$id}{end}' WHERE student_id='$id'";
1614: $dbh->do($request);
1615: }
1616: }
1617: return;
1618: }
1619:
1620: sub get_student_data_from_performance_cache {
1621: my ($sname,$sdom,$symb,$courseid)=@_;
1622: my $student = $sname.':'.$sdom if (defined($sname) && defined($sdom));
1623: &setup_table_names($courseid);
1624: #
1625: # Return hash
1626: my $studentdata;
1627: #
1628: my $dbh = &Apache::lonmysql::get_dbh();
1629: my $request = "SELECT ".
1630: "d.symb,a.part,a.solved,a.tries,a.awarded,a.award,a.awarddetail,".
1631: "a.timestamp ";
1632: if (defined($student)) {
1633: $request .= "FROM $student_table AS b ".
1634: "LEFT JOIN $performance_table AS a ON b.student_id=a.student_id ".
1635: # "LEFT JOIN $part_table AS c ON c.part_id = a.part_id ".
1636: "LEFT JOIN $symb_table AS d ON d.symb_id = a.symb_id ".
1637: "WHERE student='$student'";
1638: if (defined($symb) && $symb ne '') {
1639: $request .= " AND d.symb=".$dbh->quote($symb);
1640: }
1641: } elsif (defined($symb) && $symb ne '') {
1642: $request .= "FROM $symb_table as d ".
1643: "LEFT JOIN $performance_table AS a ON d.symb_id=a.symb_id ".
1644: # "LEFT JOIN $part_table AS c ON c.part_id = a.part_id ".
1645: "LEFT JOIN $student_table AS b ON b.student_id = a.student_id ".
1646: "WHERE symb='".$dbh->quote($symb)."'";
1647: }
1648: my $starttime = Time::HiRes::time;
1649: my $rows_retrieved = 0;
1650: my $sth = $dbh->prepare($request);
1651: $sth->execute();
1652: if ($sth->err()) {
1653: &Apache::lonnet::logthis("Unable to execute MySQL request:");
1654: &Apache::lonnet::logthis("\n".$request."\n");
1655: &Apache::lonnet::logthis("error is:".$sth->errstr());
1656: return undef;
1657: }
1658: foreach my $row (@{$sth->fetchall_arrayref}) {
1659: $rows_retrieved++;
1660: my ($symb,$part,$solved,$tries,$awarded,$award,$awarddetail,$time) =
1661: (@$row);
1662: my $base = 'resource.'.$part;
1663: $studentdata->{$symb}->{$base.'.solved'} = $solved;
1664: $studentdata->{$symb}->{$base.'.tries'} = $tries;
1665: $studentdata->{$symb}->{$base.'.awarded'} = $awarded;
1666: $studentdata->{$symb}->{$base.'.award'} = $award;
1667: $studentdata->{$symb}->{$base.'.awarddetail'} = $awarddetail;
1668: $studentdata->{$symb}->{'timestamp'} = $time if (defined($time) && $time ne '');
1669: }
1670: ## Get misc parameters
1671: $request = 'SELECT c.symb,a.parameter,a.value '.
1672: "FROM $student_table AS b ".
1673: "LEFT JOIN $parameters_table AS a ON b.student_id=a.student_id ".
1674: "LEFT JOIN $symb_table AS c ON c.symb_id = a.symb_id ".
1675: "WHERE student='$student'";
1676: if (defined($symb) && $symb ne '') {
1677: $request .= " AND c.symb=".$dbh->quote($symb);
1678: }
1679: $sth = $dbh->prepare($request);
1680: $sth->execute();
1681: if ($sth->err()) {
1682: &Apache::lonnet::logthis("Unable to execute MySQL request:");
1683: &Apache::lonnet::logthis("\n".$request."\n");
1684: &Apache::lonnet::logthis("error is:".$sth->errstr());
1685: if (defined($symb) && $symb ne '') {
1686: $studentdata = $studentdata->{$symb};
1687: }
1688: return $studentdata;
1689: }
1690: #
1691: foreach my $row (@{$sth->fetchall_arrayref}) {
1692: $rows_retrieved++;
1693: my ($symb,$parameter,$value) = (@$row);
1694: $studentdata->{$symb}->{$parameter} = $value;
1695: }
1696: #
1697: if (defined($symb) && $symb ne '') {
1698: $studentdata = $studentdata->{$symb};
1699: }
1700: return $studentdata;
1701: }
1702:
1703:
1704: sub get_current_state {
1705: my ($sname,$sdom,$symb,$courseid,$forcedownload)=@_;
1706: #
1707: $courseid = $env{'request.course.id'} if (! defined($courseid));
1708: #
1709: return () if (! defined($sname) || ! defined($sdom));
1710: #
1711: my ($status,$data) = &ensure_current_data($sname,$sdom,$courseid);
1712: # &Apache::lonnet::logthis
1713: # ('sname = '.$sname.
1714: # ' domain = '.$sdom.
1715: # ' status = '.$status.
1716: # ' data is '.(defined($data)?'defined':'undefined'));
1717: # while (my ($symb,$hash) = each(%$data)) {
1718: # &Apache::lonnet::logthis($symb."\n----------------------------------");
1719: # while (my ($key,$value) = each (%$hash)) {
1720: # &Apache::lonnet::logthis(" ".$key." = ".$value);
1721: # }
1722: # }
1723: #
1724: if (defined($data) && defined($symb) && ref($data->{$symb})) {
1725: return %{$data->{$symb}};
1726: } elsif (defined($data) && ! defined($symb) && ref($data)) {
1727: return %$data;
1728: }
1729: if ($status eq 'no data') {
1730: return ();
1731: } else {
1732: if ($status ne 'okay' && $status ne '') {
1733: &Apache::lonnet::logthis('status = '.$status);
1734: return ('error: '.$status,undef);
1735: }
1736: my $returnhash = &get_student_data_from_performance_cache($sname,$sdom,
1737: $symb,$courseid);
1738: return %$returnhash if (defined($returnhash));
1739: }
1740: return ();
1741: }
1742:
1743:
1744: sub get_problem_statistics {
1745: my ($Sections,$Groups,$status,$symb,$part,$courseid,$starttime,$endtime) = @_;
1746: return if (! defined($symb) || ! defined($part));
1747: $courseid = $env{'request.course.id'} if (! defined($courseid));
1748: #
1749: &setup_table_names($courseid);
1750: my $symb_id = &get_symb_id($symb);
1751: my $part_id = &get_part_id($part);
1752: my $stats_table = &temp_table_name($courseid,'problem_stats');
1753: #
1754: my $dbh = &Apache::lonmysql::get_dbh();
1755: return undef if (! defined($dbh));
1756: #
1757: # Clean out the table
1758: $dbh->do('DROP TABLE '.$stats_table); # May return an error
1759: my $request =
1760: 'CREATE TEMPORARY TABLE '.$stats_table.' '.
1761: 'SELECT a.student_id,a.solved,a.award,a.awarded,a.tries '.
1762: 'FROM '.$performance_table.' AS a ';
1763: #
1764: # See if we need to include some requirements on the students
1765: if ((defined($Sections) && lc($Sections->[0]) ne 'all') ||
1766: (defined($status) && lc($status) ne 'any')) {
1767: $request .= 'NATURAL LEFT JOIN '.$student_table.' AS b ';
1768: }
1769: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
1770: if (defined($groups_join)) {
1771: $request .= $groups_join;
1772: }
1773: $request .= ' WHERE a.symb_id='.$symb_id.' AND a.part_id='.$part_id;
1774: #
1775: # Limit the students included to those specified
1776: my ($section_limits,$enrollment_limits)=
1777: &limit_by_section_and_status($Sections,$status,'b');
1778: #
1779: # Limit by starttime and endtime
1780: my $time_requirements = undef;
1781: if (defined($starttime)) {
1782: $time_requirements .= 'a.timestamp>='.$starttime;
1783: if (defined($endtime)) {
1784: $time_requirements .= ' AND a.timestamp<='.$endtime;
1785: }
1786: } elsif (defined($endtime)) {
1787: $time_requirements .= 'a.timestamp<='.$endtime;
1788: }
1789: if (defined($time_requirements)) {
1790: $request .= ' AND '.$time_requirements;
1791: }
1792: if (defined($section_limits)) {
1793: $request .= ' AND '.$section_limits;
1794: }
1795: if (defined($enrollment_limits)) {
1796: $request .= ' AND '.$enrollment_limits;
1797: }
1798: # Limit by group, as required
1799: if (defined($group_limits)) {
1800: $request .= ' AND '.$group_limits;
1801: }
1802: #
1803: # Finally, execute the request to create the temporary table
1804: $dbh->do($request);
1805: #
1806: # Collect the first suite of statistics
1807: $request = 'SELECT COUNT(*),SUM(tries),'.
1808: 'AVG(tries),STD(tries) '.
1809: 'FROM '.$stats_table;
1810: my ($num,$tries,$mean,$STD) = &execute_SQL_request
1811: ($dbh,$request);
1812: #
1813: $request = 'SELECT MAX(tries),MIN(tries) FROM '.$stats_table.
1814: ' WHERE awarded>0';
1815: my ($max,$min) = &execute_SQL_request($dbh,$request);
1816: #
1817: $request = 'SELECT SUM(awarded) FROM '.$stats_table;
1818: my ($Solved) = &execute_SQL_request($dbh,$request);
1819: #
1820: $request = 'SELECT SUM(awarded) FROM '.$stats_table.
1821: " WHERE solved='correct_by_override'";
1822: my ($solved) = &execute_SQL_request($dbh,$request);
1823: #
1824: $Solved -= $solved;
1825: #
1826: $num = 0 if (! defined($num));
1827: $tries = 0 if (! defined($tries));
1828: $max = 0 if (! defined($max));
1829: $min = 0 if (! defined($min));
1830: $STD = 0 if (! defined($STD));
1831: $Solved = 0 if (! defined($Solved) || $Solved < 0);
1832: $solved = 0 if (! defined($solved));
1833: #
1834: # Compute the more complicated statistics
1835: my $DegOfDiff = 'nan';
1836: $DegOfDiff = 1-($Solved)/$tries if ($tries>0);
1837: #
1838: my $SKEW = 'nan';
1839: my $wrongpercent = 0;
1840: my $numwrong = 'nan';
1841: if ($num > 0) {
1842: ($SKEW) = &execute_SQL_request($dbh,'SELECT SQRT(SUM('.
1843: 'POWER(tries - '.$STD.',3)'.
1844: '))/'.$num.' FROM '.$stats_table);
1845: $numwrong = $num-$Solved;
1846: $wrongpercent=int(10*100*$numwrong/$num)/10;
1847: }
1848: #
1849: # Drop the temporary table
1850: $dbh->do('DROP TABLE '.$stats_table); # May return an error
1851: #
1852: # Return result
1853: return { num_students => $num,
1854: tries => $tries,
1855: max_tries => $max,
1856: min_tries => $min,
1857: mean_tries => $mean,
1858: std_tries => $STD,
1859: skew_tries => $SKEW,
1860: num_solved => $Solved,
1861: num_override => $solved,
1862: num_wrong => $numwrong,
1863: per_wrong => $wrongpercent,
1864: deg_of_diff => $DegOfDiff };
1865: }
1866:
1867: ##
1868: ## This is a helper for get_statistics
1869: sub execute_SQL_request {
1870: my ($dbh,$request)=@_;
1871: # &Apache::lonnet::logthis($request);
1872: my $sth = $dbh->prepare($request);
1873: if (!$sth) {
1874: die($dbh->errstr . " SQL: $request");
1875: }
1876: $sth->execute();
1877: my $row = $sth->fetchrow_arrayref();
1878: if (ref($row) eq 'ARRAY' && scalar(@$row)>0) {
1879: return @$row;
1880: }
1881: return ();
1882: }
1883:
1884:
1885: sub populate_weight_table {
1886: my ($courseid) = @_;
1887: if (! defined($courseid)) {
1888: $courseid = $env{'request.course.id'};
1889: }
1890: #
1891: &setup_table_names($courseid);
1892: my $navmap = Apache::lonnavmaps::navmap->new();
1893: if (!defined($navmap)) {
1894: &Apache::lonnet::logthis('loncoursedata::populate_weight_table:'.$/.
1895: ' unable to get navmaps resource'.$/.
1896: ' '.join(' ',(caller)));
1897: return;
1898: }
1899: my @sequences = $navmap->retrieveResources(undef,
1900: sub { shift->is_map(); },1,0,1);
1901: my @resources;
1902: foreach my $seq (@sequences) {
1903: push(@resources,$navmap->retrieveResources($seq,
1904: sub {shift->is_gradable();},
1905: 0,0,0));
1906: }
1907: if (! scalar(@resources)) {
1908: &Apache::lonnet::logthis('loncoursedata::populate_weight_table:'.$/.
1909: ' no resources returned for '.$courseid);
1910: return;
1911: }
1912: # Since we use lonnet::EXT to retrieve problem weights,
1913: # to ensure current data we must clear the caches out.
1914: &Apache::lonnet::clear_EXT_cache_status();
1915: my $dbh = &Apache::lonmysql::get_dbh();
1916: my $request = 'INSERT IGNORE INTO '.$weight_table.
1917: "(symb_id,part_id,weight) VALUES ";
1918: my $weight;
1919: foreach my $res (@resources) {
1920: my $symb_id = &get_symb_id($res->symb);
1921: foreach my $part (@{$res->parts}) {
1922: my $part_id = &get_part_id($part);
1923: $weight = &Apache::lonnet::EXT('resource.'.$part.'.weight',
1924: $res->symb,
1925: undef,undef,undef);
1926: if (!defined($weight) || ($weight eq '')) {
1927: $weight=1;
1928: }
1929: $request .= "('".$symb_id."','".$part_id."','".$weight."'),";
1930: }
1931: }
1932: $request =~ s/(,)$//;
1933: # &Apache::lonnet::logthis('request = '.$/.$request);
1934: $dbh->do($request);
1935: if ($dbh->err()) {
1936: &Apache::lonnet::logthis("error ".$dbh->errstr().
1937: " occurred executing \n".
1938: $request);
1939: }
1940: return;
1941: }
1942:
1943: sub limit_by_start_end_time {
1944: my ($starttime,$endtime,$table) = @_;
1945: my $time_requirements = undef;
1946: if (defined($starttime)) {
1947: $time_requirements .= $table.".timestamp>='".$starttime."'";
1948: if (defined($endtime)) {
1949: $time_requirements .= " AND ".$table.".timestamp<='".$endtime."'";
1950: }
1951: } elsif (defined($endtime)) {
1952: $time_requirements .= $table.".timestamp<='".$endtime."'";
1953: }
1954: return $time_requirements;
1955: }
1956:
1957:
1958: sub limit_by_section_and_status {
1959: my ($Sections,$enrollment,$tablename) = @_;
1960: my $student_requirements = undef;
1961: if ( (defined($Sections) && $Sections->[0] ne 'all')) {
1962: $student_requirements = '('.
1963: join(' OR ', map { $tablename.".section='".$_."'" } @$Sections
1964: ).')';
1965: }
1966: my $enrollment_requirements=undef;
1967: if (defined($enrollment) && $enrollment ne 'Any') {
1968: my $now = time();
1969: if ( $enrollment eq 'Future' ) {
1970: $enrollment_requirements =
1971: "( $tablename.start > $now AND ".
1972: "( $tablename.end = 0 OR $tablename.end > $now))";
1973: } elsif ( $enrollment eq 'Active' ) {
1974: $enrollment_requirements =
1975: "(( $tablename.start = 0 OR $tablename.start < $now ) AND ".
1976: " ( $tablename.end = 0 OR $tablename.end > $now ))";
1977: } elsif ( $enrollment eq 'Expired' ) {
1978: $enrollment_requirements =
1979: "(( $tablename.start < $now ) AND ".
1980: " ( $tablename.end < $now ))";
1981: }
1982: }
1983: return ($student_requirements,$enrollment_requirements);
1984: }
1985:
1986:
1987:
1988: sub limit_by_group {
1989: my ($Groups,$stutable,$grptable,$stugrptab) = @_;
1990: my $groups_join = undef;
1991: my $group_limits = undef;
1992: if ( (defined($Groups) && $Groups->[0] ne 'all')) {
1993: $groups_join =
1994: ' LEFT JOIN '.$students_groups_table.
1995: ' AS '.$stugrptab.' ON '.
1996: $stugrptab.'.student_id = '.$stutable.'.student_id'.
1997: ' LEFT JOIN '.$groupnames_table.
1998: ' AS '.$grptable.' ON '.
1999: $stugrptab.'.group_id = '.$grptable.'.group_id ';
2000: $group_limits =
2001: ' ('.
2002: join(' OR ', map { "$grptable.groupname='".$_."'" } @$Groups
2003: ).')';
2004: }
2005: return ($groups_join,$group_limits);
2006: }
2007:
2008:
2009: sub RNK_student { return 0; };
2010: sub RNK_score { return 1; };
2011:
2012: sub rank_students_by_scores_on_resources {
2013: my ($resources,$Sections,$Groups,$enrollment,$courseid,$starttime,$endtime,
2014: $has_award_for) = @_;
2015: return if (! defined($resources) || ! ref($resources) eq 'ARRAY');
2016: if (! defined($courseid)) {
2017: $courseid = $env{'request.course.id'};
2018: }
2019: #
2020: &setup_table_names($courseid);
2021: my $dbh = &Apache::lonmysql::get_dbh();
2022: my ($section_limits,$enrollment_limits)=
2023: &limit_by_section_and_status($Sections,$enrollment,'b');
2024: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
2025: my $symb_limits = '('.join(' OR ',map {'a.symb_id='.&get_symb_id($_);
2026: } @$resources
2027: ).')';
2028: my ($award_col, $award_join, $award_clause) = ('', '', '');
2029: if ($has_award_for) {
2030: my $resource_id = &get_symb_id($has_award_for);
2031: $award_col = ", perf.awarded";
2032: $award_join = "LEFT JOIN $performance_table AS perf ON perf.symb_id"
2033: ." = $resource_id AND perf.student_id = b.student_id ";
2034: $award_clause = "AND perf.awarded IS NOT NULL";
2035: }
2036: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
2037: my $request = "SELECT b.student,SUM(a.awarded*w.weight) AS score "
2038: ."$award_col FROM $performance_table AS a ".
2039: "NATURAL LEFT JOIN $weight_table AS w ".
2040: "LEFT JOIN $student_table AS b ON a.student_id=b.student_id ".
2041: "$award_join $groups_join ";
2042: my $limits;
2043: if (defined($section_limits)) {
2044: $limits .= $section_limits.' AND ';
2045: }
2046: if (defined($enrollment_limits)) {
2047: $limits .= $enrollment_limits.' AND ';
2048: }
2049: if (defined($time_limits)) {
2050: $limits .= $time_limits.' AND ';
2051: }
2052: if ($symb_limits ne '()') {
2053: $limits .= $symb_limits.' AND ';
2054: }
2055: if (defined($group_limits)) {
2056: $limits .= $group_limits.' AND ';
2057: }
2058: if ($limits) {
2059: $limits =~ s/( AND )$//; # Remove extra conjunction
2060: $request .= "WHERE $limits";
2061: }
2062: $request .= " $award_clause GROUP BY a.student_id ORDER BY score, b.student";
2063: #&Apache::lonnet::logthis('request = '.$/.$request);
2064: my $sth = $dbh->prepare($request) or die "Can't prepare $request";
2065: $sth->execute();
2066: my $rows = $sth->fetchall_arrayref();
2067: return ($rows);
2068: }
2069:
2070: sub get_sum_of_scores {
2071: my ($symb,$part,$students,$courseid,$starttime,$endtime) = @_;
2072: if (! defined($courseid)) {
2073: $courseid = $env{'request.course.id'};
2074: }
2075: if (defined($students) &&
2076: ((@$students == 0) ||
2077: (@$students == 1 && (! defined($students->[0]) ||
2078: $students->[0] eq ''))
2079: )
2080: ){
2081: undef($students);
2082: }
2083: #
2084: &setup_table_names($courseid);
2085: my $dbh = &Apache::lonmysql::get_dbh();
2086: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
2087: my $request = 'SELECT SUM(a.awarded*w.weight),SUM(w.weight) FROM '.
2088: $performance_table.' AS a '.
2089: 'NATURAL LEFT JOIN '.$weight_table.' AS w ';
2090: $request .= 'WHERE a.symb_id='.&get_symb_id($symb).
2091: ' AND a.part_id='.&get_part_id($part);
2092: if (defined($time_limits)) {
2093: $request .= ' AND '.$time_limits;
2094: }
2095: if (defined($students)) {
2096: $request .= ' AND ('.
2097: join(' OR ',map {'a.student_id='.&get_student_id(split(':',$_));
2098: } @$students).
2099: ')';
2100: }
2101: my $sth = $dbh->prepare($request);
2102: $sth->execute();
2103: my $rows = $sth->fetchrow_arrayref();
2104: if ($dbh->err) {
2105: &Apache::lonnet::logthis('error 1 = '.$dbh->errstr());
2106: &Apache::lonnet::logthis('prepared then executed, fetchrow_arrayrefed'.
2107: $/.$request);
2108: return (undef,undef);
2109: }
2110: return ($rows->[0],$rows->[1]);
2111: }
2112:
2113:
2114: sub score_stats {
2115: my ($Sections,$Groups,$enrollment,$symbs,$starttime,$endtime,$courseid)=@_;
2116: if (! defined($courseid)) {
2117: $courseid = $env{'request.course.id'};
2118: }
2119: #
2120: &setup_table_names($courseid);
2121: my $dbh = &Apache::lonmysql::get_dbh();
2122: #
2123: my ($section_limits,$enrollment_limits)=
2124: &limit_by_section_and_status($Sections,$enrollment,'b');
2125: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
2126: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
2127: my @Symbids = map { &get_symb_id($_); } @{$symbs};
2128: #
2129: my $stats_table = &temp_table_name($courseid,'problem_stats');
2130: my $symb_restriction = join(' OR ',map {'a.symb_id='.$_;} @Symbids);
2131: my $request = 'DROP TABLE '.$stats_table;
2132: $dbh->do($request);
2133: $request =
2134: 'CREATE TEMPORARY TABLE '.$stats_table.' '.
2135: 'SELECT a.student_id,'.
2136: 'SUM(a.awarded*w.weight) AS score FROM '.
2137: $performance_table.' AS a '.
2138: 'NATURAL LEFT JOIN '.$weight_table.' AS w '.
2139: 'LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id '.
2140: $groups_join;
2141: my $limit = ' WHERE ('.$symb_restriction.')';
2142: if ($time_limits) {
2143: $limit .= ' AND '.$time_limits;
2144: }
2145: if ($section_limits) {
2146: $limit .= ' AND '.$section_limits;
2147: }
2148: if ($enrollment_limits) {
2149: $limit .= ' AND '.$enrollment_limits;
2150: }
2151: if ($group_limits) {
2152: $limit .= ' AND '.$group_limits;
2153: }
2154: $request .= $limit.' GROUP BY a.student_id';
2155: # &Apache::lonnet::logthis('request = '.$/.$request);
2156: my $sth = $dbh->prepare($request);
2157: $sth->execute();
2158: $request =
2159: 'SELECT AVG(score),STD(score),MAX(score),MIN(score),COUNT(score) '.
2160: 'FROM '.$stats_table;
2161: my ($ave,$std,$max,$min,$count) = &execute_SQL_request($dbh,$request);
2162: # &Apache::lonnet::logthis('request = '.$/.$request);
2163:
2164: $request = 'SELECT SUM(weight) FROM '.$weight_table.
2165: ' AS a WHERE ('.$symb_restriction.')';
2166: my ($max_possible) = &execute_SQL_request($dbh,$request);
2167: # &Apache::lonnet::logthis('request = '.$/.$request);
2168: return($min,$max,$ave,$std,$count,$max_possible);
2169: }
2170:
2171:
2172:
2173: sub count_stats {
2174: my ($Sections,$Groups,$enrollment,$symbs,$starttime,$endtime,$courseid)=@_;
2175: if (! defined($courseid)) {
2176: $courseid = $env{'request.course.id'};
2177: }
2178: #
2179: &setup_table_names($courseid);
2180: my $dbh = &Apache::lonmysql::get_dbh();
2181: #
2182: my ($section_limits,$enrollment_limits)=
2183: &limit_by_section_and_status($Sections,$enrollment,'b');
2184: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
2185: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
2186: my @Symbids = map { &get_symb_id($_); } @{$symbs};
2187: #
2188: my $stats_table = &temp_table_name($courseid,'problem_stats');
2189: my $symb_restriction = join(' OR ',map {'a.symb_id='.$_;} @Symbids);
2190: my $request = 'DROP TABLE '.$stats_table;
2191: $dbh->do($request);
2192: $request =
2193: 'CREATE TEMPORARY TABLE '.$stats_table.' '.
2194: 'SELECT a.student_id,'.
2195: 'SUM(a.awarded) AS count FROM '.
2196: $performance_table.' AS a '.
2197: 'LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id '.
2198: $groups_join;
2199: my $limit = ' WHERE ('.$symb_restriction.')';
2200: if ($time_limits) {
2201: $limit .= ' AND '.$time_limits;
2202: }
2203: if ($section_limits) {
2204: $limit .= ' AND '.$section_limits;
2205: }
2206: if ($enrollment_limits) {
2207: $limit .= ' AND '.$enrollment_limits;
2208: }
2209: if ($group_limits) {
2210: $limit .= ' AND '.$group_limits;
2211: }
2212: $request .= $limit.' GROUP BY a.student_id';
2213: # &Apache::lonnet::logthis('request = '.$/.$request);
2214: my $sth = $dbh->prepare($request);
2215: $sth->execute();
2216: $request =
2217: 'SELECT AVG(count),STD(count),MAX(count),MIN(count),COUNT(count) '.
2218: 'FROM '.$stats_table;
2219: my ($ave,$std,$max,$min,$count) = &execute_SQL_request($dbh,$request);
2220: # &Apache::lonnet::logthis('request = '.$/.$request);
2221: return($min,$max,$ave,$std,$count);
2222: }
2223:
2224:
2225: sub get_student_data {
2226: my ($students,$courseid) = @_;
2227: $courseid = $env{'request.course.id'} if (! defined($courseid));
2228: &setup_table_names($courseid);
2229: my $dbh = &Apache::lonmysql::get_dbh();
2230: return undef if (! defined($dbh));
2231: my $request = 'SELECT '.
2232: 'student_id, student '.
2233: 'FROM '.$student_table;
2234: if (defined($students)) {
2235: $request .= ' WHERE ('.
2236: join(' OR ', map {'student_id='.
2237: &get_student_id($_->{'username'},
2238: $_->{'domain'})
2239: } @$students
2240: ).')';
2241: }
2242: $request.= ' ORDER BY student_id';
2243: my $sth = $dbh->prepare($request);
2244: $sth->execute();
2245: if ($dbh->err) {
2246: &Apache::lonnet::logthis('error 2 = '.$dbh->errstr());
2247: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2248: return undef;
2249: }
2250: my $dataset = $sth->fetchall_arrayref();
2251: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2252: return $dataset;
2253: }
2254: }
2255:
2256: sub RD_student_id { return 0; }
2257: sub RD_awarddetail { return 1; }
2258: sub RD_response_eval { return 2; }
2259: sub RD_response_eval_2 { return 3; }
2260: sub RD_submission { return 4; }
2261: sub RD_timestamp { return 5; }
2262: sub RD_tries { return 6; }
2263: sub RD_sname { return 7; }
2264:
2265: sub get_response_data {
2266: my ($Sections,$Groups,$enrollment,$symb,$response,$courseid) = @_;
2267: return undef if (! defined($symb) ||
2268: ! defined($response));
2269: $courseid = $env{'request.course.id'} if (! defined($courseid));
2270: #
2271: &setup_table_names($courseid);
2272: my $symb_id = &get_symb_id($symb);
2273: if (! defined($symb_id)) {
2274: &Apache::lonnet::logthis('Unable to find symb for '.$symb.' in '.$courseid);
2275: return undef;
2276: }
2277: my $response_id = &get_part_id($response);
2278: if (! defined($response_id)) {
2279: &Apache::lonnet::logthis('Unable to find id for '.$response.' in '.$courseid);
2280: return undef;
2281: }
2282: #
2283: my $dbh = &Apache::lonmysql::get_dbh();
2284: return undef if (! defined($dbh));
2285: #
2286: my ($student_requirements,$enrollment_requirements) =
2287: &limit_by_section_and_status($Sections,$enrollment,'d');
2288: my ($groups_join,$group_limits) = &limit_by_group($Groups,'d','e','f');
2289: my $request = 'SELECT '.
2290: 'a.student_id, a.awarddetail, a.response_specific_value, '.
2291: 'a.response_specific_value_2, a.submission, b.timestamp, '.
2292: 'c.tries, d.student '.
2293: 'FROM '.$fulldump_response_table.' AS a '.
2294: 'LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
2295: 'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
2296: 'a.transaction = b.transaction '.
2297: 'LEFT JOIN '.$fulldump_part_table.' AS c '.
2298: 'ON a.symb_id=c.symb_id AND a.student_id=c.student_id AND '.
2299: 'a.part_id=c.part_id AND a.transaction = c.transaction '.
2300: 'LEFT JOIN '.$student_table.' AS d '.
2301: 'ON a.student_id=d.student_id '.
2302: $groups_join;
2303: my $limit = ' WHERE '.
2304: 'a.symb_id='.$symb_id.' AND a.response_id='.$response_id;
2305: if (defined($student_requirements)) {
2306: $limit .= ' AND '.$student_requirements;
2307: }
2308: if (defined($enrollment_requirements)) {
2309: $limit .= ' AND '.$enrollment_requirements;
2310: }
2311: if (defined($group_limits)) {
2312: $limit .= ' AND '.$group_limits;
2313: }
2314: $request .= $limit.' ORDER BY b.timestamp';
2315: # &Apache::lonnet::logthis("request =\n".$request);
2316: my $sth = $dbh->prepare($request);
2317: $sth->execute();
2318: if ($dbh->err) {
2319: &Apache::lonnet::logthis('error 3 = '.$dbh->errstr());
2320: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2321: return undef;
2322: }
2323: my $dataset = $sth->fetchall_arrayref();
2324: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2325: # Clear the \'s from around the submission
2326: for (my $i =0;$i<scalar(@$dataset);$i++) {
2327: $dataset->[$i]->[&RD_submission()] =~ s/(\'$|^\')//g;
2328: }
2329: return $dataset;
2330: }
2331: }
2332:
2333:
2334: sub RDs_awarddetail { return 3; }
2335: sub RDs_submission { return 2; }
2336: sub RDs_timestamp { return 1; }
2337: sub RDs_tries { return 0; }
2338: sub RDs_awarded { return 4; }
2339: sub RDs_response_eval { return 5; }
2340: sub RDs_response_eval_2 { return 6; }
2341: sub RDs_part_award { return 7; }
2342:
2343: sub get_response_data_by_student {
2344: my ($student,$symb,$response,$courseid) = @_;
2345: return undef if (! defined($symb) ||
2346: ! defined($response));
2347: $courseid = $env{'request.course.id'} if (! defined($courseid));
2348: #
2349: &setup_table_names($courseid);
2350: my $symb_id = &get_symb_id($symb);
2351: my $response_id = &get_part_id($response);
2352: #
2353: my $student_id = &get_student_id($student->{'username'},
2354: $student->{'domain'});
2355: #
2356: my $dbh = &Apache::lonmysql::get_dbh();
2357: return undef if (! defined($dbh));
2358: my $request = 'SELECT '.
2359: 'c.tries, b.timestamp, a.submission, a.awarddetail, c.awarded, '.
2360: 'a.response_specific_value, a.response_specific_value_2, c.award '.
2361: 'FROM '.$fulldump_response_table.' AS a '.
2362: 'LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
2363: 'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
2364: 'a.transaction = b.transaction '.
2365: 'LEFT JOIN '.$fulldump_part_table.' AS c '.
2366: 'ON a.symb_id=c.symb_id AND a.student_id=c.student_id AND '.
2367: 'a.part_id=c.part_id AND a.transaction = c.transaction '.
2368: 'LEFT JOIN '.$student_table.' AS d '.
2369: 'ON a.student_id=d.student_id '.
2370: 'LEFT JOIN '.$performance_table.' AS e '.
2371: 'ON a.symb_id=e.symb_id AND a.part_id=e.part_id AND '.
2372: 'a.student_id=e.student_id AND c.tries=e.tries '.
2373: 'WHERE '.
2374: 'a.symb_id='.$symb_id.' AND a.response_id='.$response_id.
2375: ' AND a.student_id='.$student_id.' ORDER BY b.timestamp';
2376: # &Apache::lonnet::logthis("request =\n".$request);
2377: my $sth = $dbh->prepare($request);
2378: $sth->execute();
2379: if ($dbh->err) {
2380: &Apache::lonnet::logthis('error 4 = '.$dbh->errstr());
2381: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2382: return undef;
2383: }
2384: my $dataset = $sth->fetchall_arrayref();
2385: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2386: # Clear the \'s from around the submission
2387: for (my $i =0;$i<scalar(@$dataset);$i++) {
2388: $dataset->[$i]->[&RDs_submission] =~ s/(\'$|^\')//g;
2389: }
2390: return $dataset;
2391: }
2392: return undef; # error occurred
2393: }
2394:
2395: sub RT_student_id { return 0; }
2396: sub RT_awarded { return 1; }
2397: sub RT_tries { return 2; }
2398: sub RT_timestamp { return 3; }
2399:
2400: sub get_response_time_data {
2401: my ($sections,$groups,$enrollment,$symb,$part,$courseid) = @_;
2402: return undef if (! defined($symb) ||
2403: ! defined($part));
2404: $courseid = $env{'request.course.id'} if (! defined($courseid));
2405: #
2406: &setup_table_names($courseid);
2407: my $symb_id = &get_symb_id($symb);
2408: if (! defined($symb_id)) {
2409: &Apache::lonnet::logthis('Unable to find symb for '.$symb.' in '.$courseid);
2410: return undef;
2411: }
2412: my $part_id = &get_part_id($part);
2413: if (! defined($part_id)) {
2414: &Apache::lonnet::logthis('Unable to find id for '.$part.' in '.$courseid);
2415: return undef;
2416: }
2417: #
2418: my $dbh = &Apache::lonmysql::get_dbh();
2419: return undef if (! defined($dbh));
2420: my ($student_requirements,$enrollment_requirements) =
2421: &limit_by_section_and_status($sections,$enrollment,'d');
2422: my ($groups_join,$group_limits) = &limit_by_group($groups,'d','e','f');
2423: my $request = 'SELECT '.
2424: 'a.student_id, a.awarded, a.tries, b.timestamp '.
2425: 'FROM '.$fulldump_part_table.' AS a '.
2426: 'LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
2427: 'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
2428: 'a.transaction = b.transaction '.
2429: 'LEFT JOIN '.$student_table.' as d '.
2430: 'ON a.student_id=d.student_id '.
2431: $groups_join;
2432: my $limit = ' WHERE '.
2433: 'a.symb_id='.$symb_id.' AND a.part_id='.$part_id;
2434: if (defined($student_requirements)) {
2435: $limit .= ' AND '.$student_requirements;
2436: }
2437: if (defined($enrollment_requirements)) {
2438: $limit .= ' AND '.$enrollment_requirements;
2439: }
2440: if (defined($group_limits)) {
2441: $limit .= ' AND '.$group_limits;
2442: }
2443: $request .= $limit.' ORDER BY b.timestamp';
2444: # &Apache::lonnet::logthis("request =\n".$request);
2445: my $sth = $dbh->prepare($request);
2446: $sth->execute();
2447: if ($dbh->err) {
2448: &Apache::lonnet::logthis('error 5 = '.$dbh->errstr());
2449: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2450: return undef;
2451: }
2452: my $dataset = $sth->fetchall_arrayref();
2453: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2454: return $dataset;
2455: }
2456:
2457: }
2458:
2459: sub get_student_scores {
2460: my ($sections,$groups,$Symbs,$enrollment,$courseid,$starttime,$endtime) = @_;
2461: $courseid = $env{'request.course.id'} if (! defined($courseid));
2462: &setup_table_names($courseid);
2463: my $dbh = &Apache::lonmysql::get_dbh();
2464: return (undef) if (! defined($dbh));
2465: my $tmptable = &temp_table_name($courseid,'temp_'.time);
2466: my $request = 'DROP TABLE IF EXISTS '.$tmptable;
2467: # &Apache::lonnet::logthis('request = '.$/.$request);
2468: $dbh->do($request);
2469: #
2470: my $symb_requirements;
2471: if (defined($Symbs) && @$Symbs) {
2472: $symb_requirements = '('.
2473: join(' OR ', map{ "(a.symb_id='".&get_symb_id($_->{'symb'}).
2474: "' AND a.part_id='".&get_part_id($_->{'part'}).
2475: "')"
2476: } @$Symbs).')';
2477: }
2478: #
2479: my ($student_requirements,$enrollment_requirements) =
2480: &limit_by_section_and_status($sections,$enrollment,'b');
2481: #
2482: my ($groups_join,$group_limits) = &limit_by_group($groups,'b','d','e');
2483: my $time_requirements = &limit_by_start_end_time($starttime,$endtime,'a');
2484: ##
2485: $request = 'CREATE TEMPORARY TABLE IF NOT EXISTS '.$tmptable.
2486: ' SELECT a.student_id,SUM(a.awarded*c.weight) AS score FROM '.
2487: $performance_table.' AS a ';
2488: $request .= "LEFT JOIN ".$weight_table.' AS c ON a.symb_id=c.symb_id AND a.part_id=c.part_id ';
2489: if (defined($student_requirements) || defined($enrollment_requirements)) {
2490: $request .= ' LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id ';
2491: }
2492: if (defined($groups_join)) {
2493: $request .= $groups_join;
2494: }
2495: if (defined($symb_requirements) ||
2496: defined($student_requirements) ||
2497: defined($enrollment_requirements) ||
2498: defined($group_limits) ) {
2499: $request .= ' WHERE ';
2500: }
2501: if (defined($symb_requirements)) {
2502: $request .= $symb_requirements.' AND ';
2503: }
2504: if (defined($student_requirements)) {
2505: $request .= $student_requirements.' AND ';
2506: }
2507: if (defined($enrollment_requirements)) {
2508: $request .= $enrollment_requirements.' AND ';
2509: }
2510: if (defined($time_requirements)) {
2511: $request .= $time_requirements.' AND ';
2512: }
2513: $request =~ s/ AND $//; # Strip of the trailing ' AND '.
2514: $request .= ' GROUP BY a.student_id';
2515: # &Apache::lonnet::logthis("request = \n".$request);
2516: my $sth = $dbh->prepare($request);
2517: $sth->execute();
2518: if ($dbh->err) {
2519: &Apache::lonnet::logthis('error 6 = '.$dbh->errstr());
2520: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2521: return undef;
2522: }
2523: $request = 'SELECT score,COUNT(*) FROM '.$tmptable.' GROUP BY score ORDER BY score';
2524: # &Apache::lonnet::logthis("request = \n".$request);
2525: $sth = $dbh->prepare($request);
2526: $sth->execute();
2527: if ($dbh->err) {
2528: &Apache::lonnet::logthis('error 7 = '.$dbh->errstr());
2529: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2530: return undef;
2531: }
2532: my $dataset = $sth->fetchall_arrayref();
2533: return $dataset;
2534: }
2535:
2536:
2537:
2538: sub setup_table_names {
2539: my ($courseid) = @_;
2540: if (! defined($courseid)) {
2541: $courseid = $env{'request.course.id'};
2542: }
2543: #
2544: if (! defined($current_course) || $current_course ne $courseid) {
2545: # Clear out variables
2546: $have_read_part_table = 0;
2547: undef(%ids_by_part);
2548: undef(%parts_by_id);
2549: $have_read_symb_table = 0;
2550: undef(%ids_by_symb);
2551: undef(%symbs_by_id);
2552: $have_read_student_table = 0;
2553: undef(%ids_by_student);
2554: undef(%students_by_id);
2555: $have_read_groupnames_table = 0;
2556: undef(%ids_by_groupname);
2557: #
2558: $current_course = $courseid;
2559: }
2560: #
2561: # Set up database names
2562: my $base_id = 'md5_'.&Digest::MD5::md5_hex($courseid);
2563: $symb_table = $base_id.'_'.'symb';
2564: $part_table = $base_id.'_'.'part';
2565: $student_table = $base_id.'_'.'student';
2566: $groupnames_table = $base_id.'_'.'groupnames';
2567: $students_groups_table = $base_id.'_'.'studentgroups';
2568: $performance_table = $base_id.'_'.'performance';
2569: $parameters_table = $base_id.'_'.'parameters';
2570: $fulldump_part_table = $base_id.'_'.'partdata';
2571: $fulldump_response_table = $base_id.'_'.'responsedata';
2572: $fulldump_timestamp_table = $base_id.'_'.'timestampdata';
2573: $weight_table = $base_id.'_'.'weight';
2574: #
2575: @Tables = (
2576: $symb_table,
2577: $part_table,
2578: $student_table,
2579: $groupnames_table,
2580: $students_groups_table,
2581: $performance_table,
2582: $parameters_table,
2583: $fulldump_part_table,
2584: $fulldump_response_table,
2585: $fulldump_timestamp_table,
2586: $weight_table,
2587: );
2588: return;
2589: }
2590:
2591: sub temp_table_name {
2592: my ($courseid,$affix) = @_;
2593: my $base_id = 'md5_'.&Digest::MD5::md5_hex($courseid);
2594: return $base_id.'_'.$affix;
2595: }
2596:
2597:
2598: } # End scope of table identifiers
2599:
2600:
2601:
2602: sub CL_SDOM { return 0; }
2603: sub CL_SNAME { return 1; }
2604: sub CL_END { return 2; }
2605: sub CL_START { return 3; }
2606: sub CL_ID { return 4; }
2607: sub CL_SECTION { return 5; }
2608: sub CL_FULLNAME { return 6; }
2609: sub CL_STATUS { return 7; }
2610: sub CL_TYPE { return 8; }
2611: sub CL_LOCKEDTYPE { return 9; }
2612: sub CL_CREDITS { return 10; }
2613: sub CL_INSTSEC { return 11; }
2614: sub CL_GROUP { return 12; }
2615: sub CL_PERMANENTEMAIL { return 13; }
2616: sub CL_ROLE { return 14; }
2617: sub CL_EXTENT { return 15; }
2618: sub CL_PHOTO { return 16; }
2619: sub CL_THUMBNAIL { return 17; }
2620: sub CL_AUTHORQUOTA { return 18; }
2621: sub CL_AUTHORUSAGE { return 19; }
2622: sub CL_CAMANAGER {return 20; }
2623:
2624: sub get_classlist {
2625: my ($cdom,$cnum) = @_;
2626: my $cid = $cdom.'_'.$cnum;
2627: if (!defined($cdom) || !defined($cnum)) {
2628: $cid = $env{'request.course.id'};
2629: $cdom = $env{'course.'.$cid.'.domain'};
2630: $cnum = $env{'course.'.$cid.'.num'};
2631: }
2632: my $now = time;
2633: #
2634: my %classlist=&Apache::lonnet::dump('classlist',$cdom,$cnum);
2635: while (my ($student,$info) = each(%classlist)) {
2636: if ($student =~ /^(con_lost|error|no_such_host)/i) {
2637: &Apache::lonnet::logthis('get_classlist error for '.$cid.':'.$student);
2638: return undef;
2639: }
2640: my ($sname,$sdom) = split(/:/,$student);
2641: my @Values = split(/:/,$info);
2642: my ($end,$start,$id,$section,$fullname,$type,$lockedtype,$credits,$instsec);
2643: if (@Values > 2) {
2644: ($end,$start,$id,$section,$fullname,$type,$lockedtype,$credits,$instsec) = @Values;
2645: } else { # We have to get the data ourselves
2646: ($end,$start) = @Values;
2647: $section = &Apache::lonnet::getsection($sdom,$sname,$cid);
2648: my %info=&Apache::lonnet::get('environment',
2649: ['firstname','middlename',
2650: 'lastname','generation','id'],
2651: $sdom, $sname);
2652: my ($tmp) = keys(%info);
2653: if ($tmp =~/^(con_lost|error|no_such_host)/i) {
2654: $fullname = 'not available';
2655: $id = 'not available';
2656: &Apache::lonnet::logthis('unable to retrieve environment '.
2657: 'for '.$sname.':'.$sdom);
2658: } else {
2659: $fullname = &Apache::lonnet::format_name(@info{qw/firstname middlename lastname generation/},'lastname');
2660: $id = $info{'id'};
2661: }
2662: # Update the classlist with this students information
2663: if ($fullname ne 'not available') {
2664: my $enrolldata = join(':',$end,$start,$id,$section,$fullname);
2665: my $reply=&Apache::lonnet::cput('classlist',
2666: {$student => $enrolldata},
2667: $cdom,$cnum);
2668: if ($reply !~ /^(ok|delayed)/) {
2669: &Apache::lonnet::logthis('Unable to update classlist for '.
2670: 'student '.$sname.':'.$sdom.
2671: ' error:'.$reply);
2672: }
2673: }
2674: }
2675: my $status='Expired';
2676: if(((!$end) || $now < $end) && ((!$start) || ($now > $start))) {
2677: $status='Active';
2678: }
2679: if(($now < $start) && ((!$end) || $now < $end )) {
2680: $status='Future';
2681: }
2682: $classlist{$student} =
2683: [$sdom,$sname,$end,$start,$id,$section,$fullname,$status,$type,
2684: $lockedtype,$credits,$instsec];
2685: }
2686: if (wantarray()) {
2687: return (\%classlist,['domain','username','end','start','id',
2688: 'section','fullname','status','type',
2689: 'lockedtype','credits','instsec']);
2690: } else {
2691: return \%classlist;
2692: }
2693: }
2694:
2695: sub get_group_memberships {
2696: my ($classlist,$keylist,$cdom,$cnum) = @_;
2697:
2698: return ({},{}) if (!ref($classlist) || !ref($keylist));
2699:
2700: my $cid = $cdom.'_'.$cnum;
2701: if (!defined($cdom) || !defined($cnum)) {
2702: $cid = $env{'request.course.id'};
2703: $cdom = $env{'course.'.$cid.'.domain'};
2704: $cnum = $env{'course.'.$cid.'.num'};
2705: }
2706: my (%classgroups,%studentgroups);
2707: my $now = time;
2708: my $access_end = $env{'course.'.$cid.'.default_enrollment_end_date'};
2709: my %curr_groups =&Apache::longroup::coursegroups($cdom,$cnum);
2710: if (%curr_groups) {
2711: my $grpindex = &CL_GROUP();
2712: my %groupmemberhash =
2713: &Apache::lonnet::get_group_membership($cdom,$cnum);
2714: foreach my $student (keys(%{$classlist})) {
2715: %{$classgroups{$student}} = ();
2716: my $hasgroup = 0;
2717: foreach my $status ('previous','future','active','aftercourse') {
2718: %{$classgroups{$student}{$status}} = ();
2719: }
2720: foreach my $group (keys(%curr_groups)) {
2721: if (defined($groupmemberhash{$group.':'.$student})) {
2722: my ($end,$start) = split(/:/,$groupmemberhash{$group.':'.
2723: $student});
2724: if ($start == -1) {
2725: next;
2726: } else {
2727: $studentgroups{$group} ++;
2728: $hasgroup = 1;
2729: if ($end && $end < $now) {
2730: $classgroups{$student}{'previous'}{$group} =
2731: $groupmemberhash{$group.':'.$student};
2732: if ($classlist->{$student}[&CL_STATUS()] eq 'Expired') {
2733: if ($access_end && $access_end < $now) {
2734: if ($access_end - $end < 86400) {
2735: $classgroups{$student}{'aftercourse'}{$group} = $groupmemberhash{$group.':'.$student};
2736: }
2737: }
2738: }
2739: } elsif ($now > $start) {
2740: if (!$end || $end > $now) {
2741: $classgroups{$student}{'active'}{$group} =
2742: $groupmemberhash{$group.':'.$student};
2743: }
2744: } else {
2745: $classgroups{$student}{'future'}{$group} =
2746: $groupmemberhash{$group.':'.$student};
2747: }
2748: }
2749: }
2750: }
2751: if (!$hasgroup) {
2752: $studentgroups{'none'} ++;
2753: } else {
2754: $classlist->{$student}->[$grpindex] = join(',',
2755: sort(keys(%{$classgroups{$student}{'active'}})));
2756: }
2757: }
2758: }
2759: return (\%classgroups,\%studentgroups);
2760: }
2761:
2762: sub get_students_groups {
2763: my ($student,$enrollment_status,$classgroups) = @_;
2764: my @studentsgroups = ();
2765: if (ref($$classgroups{$student}{'active'}) eq 'HASH') {
2766: push(@studentsgroups,keys(%{$$classgroups{$student}{'active'}}));
2767: }
2768: if ($enrollment_status eq 'Any') {
2769: foreach my $status ('previous','future') {
2770: if (ref($$classgroups{$student}{$status}) eq 'HASH') {
2771: push(@studentsgroups,keys(%{$$classgroups{$student}{$status}}));
2772: }
2773: }
2774: } else {
2775: if (ref($$classgroups{$student}{'aftercourse'}) eq 'HASH') {
2776: push(@studentsgroups,keys(%{$$classgroups{$student}{'aftercourse'}}));
2777: }
2778: }
2779: return @studentsgroups;
2780: }
2781:
2782:
2783: # ----- END HELPER FUNCTIONS --------------------------------------------
2784:
2785: 1;
2786: __END__
2787:
2788:
2789: =pod
2790:
2791: =head1 NAME
2792:
2793: Apache::loncoursedata
2794:
2795: =head1 SYNOPSIS
2796:
2797: Set of functions that download and process student and course information.
2798:
2799: =head1 PACKAGES USED
2800:
2801: Apache::lonnet
2802: Apache::longroup
2803: Time::HiRes
2804: Apache::lonmysql
2805: LONCAPA
2806: Digest::MD5
2807:
2808: =head1 DOWNLOAD INFORMATION
2809:
2810: This section contains all the functions that get data from other servers
2811: and/or itself.
2812:
2813:
2814:
2815: =head1 LOCAL DATA CACHING SUBROUTINES
2816:
2817: The local caching is done using MySQL. There is no fall-back implementation
2818: if MySQL is not running.
2819:
2820: The programmers interface is to call &get_current_state() or some other
2821: primary interface subroutine (described below). The internals of this
2822: storage system are documented here.
2823:
2824: There are six tables used to store student performance data (the results of
2825: a dumpcurrent). Each of these tables is created in MySQL with a name of
2826: $courseid_*****, where ***** is 'symb', 'part', or whatever is appropriate
2827: for the table. The tables and their purposes are described below.
2828:
2829: Some notes before we get started.
2830:
2831: Each table must have a PRIMARY KEY, which is a column or set of columns which
2832: will serve to uniquely identify a row of data. NULL is not allowed!
2833:
2834: INDEXes work best on integer data.
2835:
2836: JOIN is used to combine data from many tables into one output.
2837:
2838: lonmysql.pm is used for some of the interface, specifically the table creation
2839: calls. The inserts are done in bulk by directly calling the database handler.
2840: The SELECT ... JOIN statement used to retrieve the data does not have an
2841: interface in lonmysql.pm and I shudder at the thought of writing one.
2842:
2843: =head2 Table Descriptions
2844:
2845: =over 4
2846:
2847: =head2 Tables used to store meta information
2848:
2849: The following tables hold data required to keep track of the current status
2850: of a students data in the tables or to look up the students data in the tables.
2851:
2852: =over 4
2853:
2854: =item C<$symb_table>
2855:
2856: The symb_table has two columns. The first is a 'symb_id' and the second
2857: is the text name for the 'symb' (limited to 64k). The 'symb_id' is generated
2858: automatically by MySQL so inserts should be done on this table with an
2859: empty first element. This table has its PRIMARY KEY on the 'symb_id'.
2860:
2861: =item C<$part_table>
2862:
2863: The part_table has two columns. The first is a 'part_id' and the second
2864: is the text name for the 'part' (limited to 100 characters). The 'part_id' is
2865: generated automatically by MySQL so inserts should be done on this table with
2866: an empty first element. This table has its PRIMARY KEY on the 'part' (100
2867: characters) and a KEY on 'part_id'.
2868:
2869: =item C<$student_table>
2870:
2871: The student_table has 7 columns. The first is a 'student_id' assigned by
2872: MySQL. The second is 'student' which is username:domain. The third through
2873: fifth are 'section', 'status' (enrollment status), and 'classification'
2874: (to be used in the future). The sixth and seventh ('updatetime' and
2875: 'fullupdatetime') contain the time of last update and full update of student
2876: data. This table has its PRIMARY KEY on the 'student_id' column and is indexed
2877: on 'student', 'section', and 'status'.
2878:
2879: =item C<$groupnames_table>
2880:
2881: The groupnames_table has 2 columns. The first is a 'group_id' assigned by
2882: MySQL. The second is 'groupname' which is the name of the group in the course.
2883:
2884: =item C<$students_groups_table>
2885:
2886: The students_groups_table has 2 columns. The first is the 'student_id', and the
2887: second is the 'group_id'. These two columns comprise the PRIMARY KEY for this
2888: table, as an individual student may be affiliated with more than one group at
2889: any time. This table is indexed on both student_id and group_id.
2890:
2891: =back
2892:
2893: =head2 Tables used to store current status data
2894:
2895: The following tables store data only about the students current status on
2896: a problem, meaning only the data related to the last attempt on a problem.
2897:
2898: =over 4
2899:
2900: =item C<$performance_table>
2901:
2902: The performance_table has 9 columns. The first three are 'symb_id',
2903: 'student_id', and 'part_id'. These comprise the PRIMARY KEY for this table
2904: and are directly related to the $symb_table, $student_table, and $part_table
2905: described above. MySQL does better indexing on numeric items than text,
2906: so we use these three "index tables". The remaining columns are
2907: 'solved', 'tries', 'awarded', 'award', 'awarddetail', and 'timestamp'.
2908: These are either the MySQL type TINYTEXT or various integers ('tries' and
2909: 'timestamp'). This table has KEYs of 'student_id' and 'symb_id'.
2910: For use of this table, see the functions described below.
2911:
2912: =item C<$parameters_table>
2913:
2914: The parameters_table holds the data that does not fit neatly into the
2915: performance_table. The parameters table has four columns: 'symb_id',
2916: 'student_id', 'parameter', and 'value'. 'symb_id', 'student_id', and
2917: 'parameter' comprise the PRIMARY KEY for this table. 'parameter' is
2918: limited to 255 characters. 'value' is limited to 64k characters.
2919:
2920: =back
2921:
2922: =head2 Tables used for storing historic data
2923:
2924: The following tables are used to store almost all of the transactions a student
2925: has made on a homework problem. See loncapa/docs/homework/datastorage for
2926: specific information about each of the parameters stored.
2927:
2928: =over 4
2929:
2930: =item C<$fulldump_response_table>
2931:
2932: The response table holds data (documented in loncapa/docs/homework/datastorage)
2933: associated with a particular response id which is stored when a student
2934: attempts a problem. The following are the columns of the table, in order:
2935: 'symb_id','part_id','response_id','student_id','transaction','tries',
2936: 'awarddetail', 'response_specific', 'response_specific_value',
2937: 'response_specific_2', 'response_specific_value_2', and 'submission
2938: (the text of the students submission). The primary key is based on the
2939: first five columns listed above.
2940:
2941: =item C<$fulldump_part_table()>
2942:
2943: The part table holds data (documented in loncapa/docs/homework/datastorage)
2944: associated with a particular part id which is stored when a student attempts
2945: a problem. The following are the columns of the table, in order:
2946: 'symb_id','part_id','student_id','transaction','tries','award','awarded',
2947: and 'previous'. The primary key is based on the first five columns listed
2948: above.
2949:
2950: =item C<$fulldump_timestamp_table()>
2951:
2952: The timestamp table holds the timestamps of the transactions which are
2953: stored in $fulldump_response_table and $fulldump_part_table. This data is
2954: about both the response and part data. Columns: 'symb_id','student_id',
2955: 'transaction', and 'timestamp'.
2956: The primary key is based on the first 3 columns.
2957:
2958: =item C<$weight_table()>
2959:
2960: The weight table holds the weight for the problems used in the class.
2961: Whereas the weight of a problem can vary by section and student the data
2962: here is applied to the class as a whole.
2963: Columns: 'symb_id','part_id','response_id','weight'.
2964:
2965: =back
2966:
2967:
2968: =head1 IMPORTANT SUBROUTINES
2969:
2970: Here is a brief overview of the subroutines which are likely to be of
2971: interest:
2972:
2973: =over 4
2974:
2975: =item C<&get_current_state()>
2976:
2977: programmers interface.
2978:
2979: =item C<&init_dbs()>
2980:
2981: table creation
2982:
2983: =item C<&update_student_data()>
2984:
2985: data storage calls
2986:
2987: =item C<&get_student_data_from_performance_cache()>
2988:
2989: data retrieval
2990:
2991: =back
2992:
2993: =head1 OTHER SUBROUTINES
2994:
2995: =over 4
2996:
2997: =item C<&make_into_hash($values)>
2998:
2999: Returns a reference to a hash as described by $values. $values is
3000: assumed to be the result of
3001: join(':',map {&escape($_)} %orighash);
3002:
3003: This is a helper function for get_current_state.
3004:
3005: =item C<&init_dbs()>
3006:
3007: Input: course id
3008:
3009: Output: 0 on success, positive integer on error
3010:
3011: This routine issues the calls to lonmysql to create the tables used to
3012: store student data.
3013:
3014: item C<&delete_caches()>
3015:
3016: This routine drops all the tables associated with a course from the
3017: MySQL database.
3018:
3019: Input: course id (optional, determined by environment if omitted)
3020:
3021: Returns: nothing
3022:
3023: =item C<&get_part_id()>
3024:
3025: Get the MySQL id of a problem part string.
3026:
3027: Input: $part
3028:
3029: Output: undef on error, integer $part_id on success.
3030:
3031: =item C<&get_part()>
3032:
3033: Get the string describing a part from the MySQL id of the problem part.
3034:
3035: Input: $part_id
3036:
3037: Output: undef on error, $part string on success.
3038:
3039: =item C<&get_symb_id()>
3040:
3041: Get the MySQL id of a symb.
3042:
3043: Input: $symb
3044:
3045: Output: undef on error, integer $symb_id on success.
3046:
3047: =item C<&get_symb()>
3048:
3049: Get the symb associated with a MySQL symb_id.
3050:
3051: Input: $symb_id
3052:
3053: Output: undef on error, $symb on success.
3054:
3055: =item C<&get_student_id()>
3056:
3057: Get the MySQL id of a student.
3058:
3059: Input: $sname, $dom
3060:
3061: Output: undef on error, integer $student_id on success.
3062:
3063: =item C<&get_student()>
3064:
3065: Get student username:domain associated with the MySQL student_id.
3066:
3067: Input: $student_id
3068:
3069: Output: undef on error, string $student (username:domain) on success.
3070:
3071: =item C<&clear_internal_caches()>
3072:
3073: Causes the internal caches used in get_student_id, get_student,
3074: get_symb_id, get_symb, get_part_id, and get_part to be undef'd.
3075:
3076: Needs to be called before the first operation with the MySQL database
3077: for a given Apache request.
3078:
3079: =item C<&update_full_student_data($sname,$sdom,$courseid)>
3080:
3081: Does a lonnet::dump on a student to populate the courses tables.
3082:
3083: Input: $sname, $sdom, $courseid
3084:
3085: Output: $returnstatus
3086:
3087: $returnstatus is a string describing any errors that occurred. 'okay' is the
3088: default.
3089:
3090: This subroutine loads a students data using lonnet::dump and inserts
3091: it into the MySQL database. The inserts are done on three tables,
3092: $fulldump_response_table, $fulldump_part_table, and $fulldump_timestamp_table.
3093: The INSERT calls are made directly by this subroutine, not through lonmysql
3094: because we do a 'bulk'insert which takes advantage of MySQLs non-SQL
3095: compliant INSERT command to insert multiple rows at a time.
3096: If anything has gone wrong during this process, $returnstatus is updated with
3097: a description of the error.
3098:
3099: Once the "fulldump" tables are updated, the tables used for chart and
3100: spreadsheet (which hold only the current state of the student on their
3101: homework, not historical data) are updated. If all updates have occurred
3102: successfully, $student_table is updated to reflect the time of the update.
3103:
3104: Notice we do not insert the data and immediately query it. This means it
3105: is possible for there to be data returned this first time that is not
3106: available the second time. CYA.
3107:
3108:
3109: =item C<&update_student_data()>
3110:
3111: Input: $sname, $sdom, $courseid
3112:
3113: Output: $returnstatus, \%student_data
3114:
3115: $returnstatus is a string describing any errors that occurred. 'okay' is the
3116: default.
3117: \%student_data is the data returned by a call to lonnet::currentdump.
3118:
3119: This subroutine loads a students data using lonnet::currentdump and inserts
3120: it into the MySQL database. The inserts are done on two tables,
3121: $performance_table and $parameters_table. $parameters_table holds the data
3122: that is not included in $performance_table. See the description of
3123: $performance_table elsewhere in this file. The INSERT calls are made
3124: directly by this subroutine, not through lonmysql because we do a 'bulk'
3125: insert which takes advantage of MySQLs non-SQL compliant INSERT command to
3126: insert multiple rows at a time. If anything has gone wrong during this
3127: process, $returnstatus is updated with a description of the error and
3128: \%student_data is returned.
3129:
3130: Notice we do not insert the data and immediately query it. This means it
3131: is possible for there to be data returned this first time that is not
3132: available the second time. CYA.
3133:
3134: =item &ensure_tables_are_set_up($courseid)
3135:
3136: Checks to be sure the MySQL tables for the given class are set up.
3137: If $courseid is omitted it will be obtained from the environment.
3138:
3139: Returns nothing on success and 'error' on failure
3140:
3141:
3142: =item C<&ensure_current_data()>
3143:
3144: Input: $sname, $sdom, $courseid
3145:
3146: Output: $status, $data
3147:
3148: This routine ensures the data for a given student is up to date.
3149: The $student_table is queried to determine the time of the last update.
3150: If the students data is out of date, &update_student_data() is called.
3151: The return values from the call to &update_student_data() are returned.
3152:
3153: =item C<&ensure_current_full_data($sname,$sdom,$courseid)>
3154:
3155: Input: $sname, $sdom, $courseid
3156:
3157: Output: $status
3158:
3159: This routine ensures the fulldata (the data from a lonnet::dump, not a
3160: lonnet::currentdump) for a given student is up to date.
3161: The $student_table is queried to determine the time of the last update.
3162: If the students fulldata is out of date, &update_full_student_data() is
3163: called.
3164:
3165: The return value from the call to &update_full_student_data() is returned.
3166:
3167: =item C<&get_student_data_from_performance_cache()>
3168:
3169: Input: $sname, $sdom, $symb, $courseid
3170:
3171: Output: hash reference containing the data for the given student.
3172: If $symb is undef, all the students data is returned.
3173:
3174: This routine is the heart of the local caching system. See the description
3175: of $performance_table, $symb_table, $student_table, and $part_table. The
3176: main task is building the MySQL request. The tables appear in the request
3177: in the order in which they should be parsed by MySQL. When searching
3178: on a student the $student_table is used to locate the 'student_id'. All
3179: rows in $performance_table which have a matching 'student_id' are returned,
3180: with data from $part_table and $symb_table which match the entries in
3181: $performance_table, 'part_id' and 'symb_id'. When searching on a symb,
3182: the $symb_table is processed first, with matching rows grabbed from
3183: $performance_table and filled in from $part_table and $student_table in
3184: that order.
3185:
3186: Running 'EXPLAIN ' on the 'SELECT' statements generated can be quite
3187: interesting, especially if you play with the order the tables are listed.
3188:
3189:
3190: =item C<&get_current_state()>
3191:
3192: Input: $sname,$sdom,$symb,$courseid
3193:
3194: Output: Described below
3195:
3196: Retrieve the current status of a students performance. $sname and
3197: $sdom are the only required parameters. If $symb is undef the results
3198: of an &Apache::lonnet::currentdump() will be returned.
3199: If $courseid is undef it will be retrieved from the environment.
3200:
3201: The return structure is based on &Apache::lonnet::currentdump. If
3202: $symb is unspecified, all the students data is returned in a hash of
3203: the form:
3204: (
3205: symb1 => { param1 => value1, param2 => value2 ... },
3206: symb2 => { param1 => value1, param2 => value2 ... },
3207: )
3208:
3209: If $symb is specified, a hash of
3210: (
3211: param1 => value1,
3212: param2 => value2,
3213: )
3214: is returned.
3215:
3216: If no data is found for $symb, or if the student has no performance data,
3217: an empty list is returned.
3218:
3219: =item C<&get_problem_statistics()>
3220:
3221: Gather data on a given problem. The database is assumed to be
3222: populated and all local caching variables are assumed to be set
3223: properly. This means you need to call &ensure_current_data for
3224: the students you are concerned with prior to calling this routine.
3225:
3226: Inputs: $Sections, Groups, $status, $symb, $part, $courseid, $starttime,
3227: $endtime
3228:
3229: =over 4
3230:
3231: =item $Sections Array ref containing section names for students.
3232: 'all' is allowed to be the first (and only) item in the array.
3233:
3234: =item $Groups Array ref containing group names for students.
3235: 'all' is allowed to be the first (and only) item in the array.
3236:
3237: =item $status String describing the status of students
3238:
3239: =item $symb is the symb for the problem.
3240:
3241: =item $part is the part id you need statistics for
3242:
3243: =item $courseid is the course id, of course!
3244:
3245: =item $starttime and $endtime are unix times which to use to limit
3246: the statistical data.
3247:
3248: =back
3249:
3250: Outputs: See the code for up to date information. A hash reference is
3251: returned. The hash has the following keys defined:
3252:
3253: =over 4
3254:
3255: =item * num_students
3256:
3257: The number of students attempting the problem
3258:
3259: =item tries
3260:
3261: The total number of tries for the students
3262:
3263: =item max_tries
3264:
3265: The maximum number of tries taken
3266:
3267: =item mean_tries
3268:
3269: The average number of tries
3270:
3271: =item num_solved T
3272:
3273: he number of students able to solve the problem
3274:
3275: =item num_override
3276:
3277: The number of students whose answer is 'correct_by_override'
3278:
3279: =item deg_of_diff
3280:
3281: The degree of difficulty of the problem
3282:
3283: =item std_tries
3284:
3285: The standard deviation of the number of tries
3286:
3287: =item skew_tries
3288:
3289: The skew of the number of tries
3290:
3291: =item per_wrong
3292:
3293: The number of students attempting the problem who were not
3294: able to answer it correctly.
3295:
3296: =back
3297:
3298: =item C<&populate_weight_table()>
3299:
3300: =item C<&limit_by_start_end_times()>
3301:
3302: Build SQL WHERE condition which limits the data collected by the start
3303: and end times provided
3304:
3305: Inputs: $starttime, $endtime, $table
3306:
3307: Returns: $time_limits
3308:
3309:
3310: =item C<&limit_by_section_and_status()C>
3311:
3312: Build SQL WHERE condition which limits the data collected by section and
3313: student status.
3314:
3315: Inputs: $Sections (array ref)
3316: $enrollment (string: 'any', 'expired', 'active')
3317: $tablename The name of the table that holds the student data
3318:
3319: Returns: $student_requirements,$enrollment_requirements
3320:
3321: =item C<&limit_by_group()>
3322:
3323: Build SQL LEFT JOIN statement to include students_groups and groupnames tables and SQL WHERE condition which limits the data collected by group.
3324:
3325: Inputs: $Groups (array ref)
3326: $stutable The name of the table which holds the student data.
3327: $grptable The name of the table which maps group_id to groupname.
3328: $stugrptab The name of the table which holds student group affiliations.
3329: Returns: $groups_join,$group_limits
3330: $groups_join JOIN part of SQL statement (to include group related tables)
3331: $group_limits SQL WHERE condition limiting to requested groups
3332:
3333: =item C<rank_students_by_scores_on_resources()>
3334:
3335: Inputs:
3336: $resources: array ref of hash ref. Each hash ref needs key 'symb'.
3337: $Sections: array ref of sections to include,
3338: $Groups: array ref of groups to include.
3339: $enrollment: string,
3340: $courseid (may be omitted)
3341: $starttime (may be omitted)
3342: $endtime (may be omitted)
3343: $has_award_for (may be omitted)
3344:
3345: Returns; An array of arrays. The sub arrays contain a student name and
3346: their score on the resources. $starttime and $endtime constrain the
3347: list to awards obtained during the given time limits. $has_score_on
3348: constrains the list to those students who at least attempted the
3349: resource identified by the given symb, which is used to filter out
3350: such students for statistics that would be adversely affected by such
3351: students.
3352:
3353: =item C<&get_sum_of_scores>
3354:
3355: Inputs: $resource (hash ref, needs {'symb'} key),
3356: $part, (the part id),
3357: $students (array ref, contents of array are scalars holding 'sname:sdom'),
3358: $courseid
3359:
3360: Returns: the sum of the score on the problem part over the students and the
3361: maximum possible value for the sum (taken from the weight table).
3362:
3363:
3364: =item C<&score_stats()>
3365:
3366: Inputs: $Sections, $enrollment, $symbs, $starttime,
3367: $endtime, $courseid
3368:
3369: $Sections, $enrollment, $starttime, $endtime, and $courseid are the same as
3370: elsewhere in this module.
3371: $symbs is an array ref of symbs
3372:
3373: Returns: minimum, maximum, mean, s.d., number of students, and maximum
3374: possible of student scores on the given resources
3375:
3376: =item C<&count_stats()>
3377:
3378: Inputs: $Sections, $Groups, $enrollment, $symbs, $starttime,
3379: $endtime, $courseid
3380:
3381: $Sections, $Groups $enrollment, $starttime, $endtime, and $courseid are the
3382: same as elsewhere in this module.
3383: $symbs is an array ref of symbs
3384:
3385: Returns: minimum, maximum, mean, s.d., and number of students
3386: of the number of items correct on the given resources
3387:
3388: =item C<get_student_data()>
3389:
3390: =item C<&get_student_scores($Sections,$Groups,$Symbs,$enrollment,$courseid)>
3391:
3392: =item C<&setup_table_names()>
3393:
3394: input: course id
3395:
3396: output: none
3397:
3398: =back
3399:
3400: =head3 End of Local Data Caching Subroutines
3401:
3402: =head3 Classlist Subroutines
3403:
3404: =over
3405:
3406: =item &get_classlist();
3407:
3408: Retrieve the classist of a given class or of the current class. Student
3409: information is returned from the classlist.db file and, if needed,
3410: from the students environment.
3411:
3412: Optional arguments are $cdom, and $cnum (course domain,
3413: and course number, respectively). If either is ommitted the course
3414: will be taken from the current environment ($env{'request.course.id'},
3415: $env{'course.'.$cid.'.domain'}, and $env{'course.'.$cid.'.num'}).
3416:
3417: Returns a reference to a hash which contains:
3418: keys '$sname:$sdom'
3419: values [$sdom,$sname,$end,$start,$id,$section,$fullname,$status,$type,
3420: $lockedtype,$credits,$instsec]
3421:
3422: The constant values CL_SDOM, CL_SNAME, CL_END, etc. can be used
3423: as indices into the returned list to future-proof clients against
3424: changes in the list order.
3425:
3426: =back
3427:
3428: =cut
3429:
3430:
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