1: # The LearningOnline Network with CAPA
2: #
3: # $Id: loncoursedata.pm,v 1.193.6.1 2015/03/10 05:13:11 raeburn Exp $
4: #
5: # Copyright Michigan State University Board of Trustees
6: #
7: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
8: #
9: # LON-CAPA is free software; you can redistribute it and/or modify
10: # it under the terms of the GNU General Public License as published by
11: # the Free Software Foundation; either version 2 of the License, or
12: # (at your option) any later version.
13: #
14: # LON-CAPA is distributed in the hope that it will be useful,
15: # but WITHOUT ANY WARRANTY; without even the implied warranty of
16: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17: # GNU General Public License for more details.
18: #
19: # You should have received a copy of the GNU General Public License
20: # along with LON-CAPA; if not, write to the Free Software
21: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22: #
23: # /home/httpd/html/adm/gpl.txt
24: #
25: # http://www.lon-capa.org/
26: #
27: ###
28: =pod
29:
30: =head1 NAME
31:
32: Apache::loncoursedata
33:
34: =head1 SYNOPSIS
35:
36: Set of functions that download and process student and course information.
37:
38: =head1 PACKAGES USED
39:
40: Apache::lonnet
41: Apache::longroup
42: Time::HiRes
43: Apache::lonmysql
44: LONCAPA
45: Digest::MD5
46:
47: =cut
48:
49: package Apache::loncoursedata;
50:
51: use strict;
52: use Apache::lonnet;
53: use Apache::longroup();
54: use Time::HiRes();
55: use Apache::lonmysql();
56: use LONCAPA;
57: use Digest::MD5();
58:
59: =pod
60:
61: =head2 make_into_hash
62:
63: Turn a colon separated string into a hash and return a reference
64: to it. Numbering from 0 even elements are keys and odd elements
65: are values e.g. a:b:c:d creates a hash like
66: a => b, c =>d
67:
68: =cut
69:
70: sub make_into_hash {
71: my $values = shift;
72: my %tmp = map { &unescape($_); } split(':',$values);
73: return \%tmp;
74: }
75:
76:
77: { # Begin scope of table identifiers
78:
79: my $current_course ='';
80: my $symb_table;
81: my $part_table;
82: my $student_table;
83: my $groupnames_table;
84: my $students_groups_table;
85: my $performance_table;
86: my $parameters_table;
87: my $fulldump_response_table;
88: my $fulldump_part_table;
89: my $fulldump_timestamp_table;
90: my $weight_table;
91:
92: my @Tables;
93:
94:
95:
96: sub init_dbs {
97: my ($courseid,$drop) = @_;
98: &setup_table_names($courseid);
99: #
100: # Drop any of the existing tables
101: if ($drop) {
102: foreach my $table (@Tables) {
103: &Apache::lonmysql::drop_table($table);
104: }
105: }
106: #
107: # Note - changes to this table must be reflected in the code that
108: # stores the data (calls &Apache::lonmysql::store_row with this table
109: # id
110: my $symb_table_def = {
111: id => $symb_table,
112: permanent => 'no',
113: columns => [{ name => 'symb_id',
114: type => 'MEDIUMINT UNSIGNED',
115: restrictions => 'NOT NULL',
116: auto_inc => 'yes', },
117: { name => 'symb',
118: type => 'MEDIUMTEXT',
119: restrictions => 'NOT NULL'},
120: ],
121: 'PRIMARY KEY' => ['symb_id'],
122: };
123: #
124: my $part_table_def = {
125: id => $part_table,
126: permanent => 'no',
127: columns => [{ name => 'part_id',
128: type => 'MEDIUMINT UNSIGNED',
129: restrictions => 'NOT NULL',
130: auto_inc => 'yes', },
131: { name => 'part',
132: type => 'VARCHAR(100) BINARY',
133: restrictions => 'NOT NULL'},
134: ],
135: 'PRIMARY KEY' => ['part (100)'],
136: 'KEY' => [{ columns => ['part_id']},],
137: };
138: #
139: my $student_table_def = {
140: id => $student_table,
141: permanent => 'no',
142: columns => [{ name => 'student_id',
143: type => 'MEDIUMINT UNSIGNED',
144: restrictions => 'NOT NULL',
145: auto_inc => 'yes', },
146: { name => 'student',
147: type => 'VARCHAR(100) BINARY',
148: restrictions => 'NOT NULL UNIQUE'},
149: { name => 'section',
150: type => 'VARCHAR(100) BINARY',
151: restrictions => 'NOT NULL'},
152: { name => 'start',
153: type => 'INT',
154: restrictions => 'NOT NULL'},
155: { name => 'end',
156: type => 'INT',
157: restrictions => 'NOT NULL'},
158: { name => 'classification',
159: type => 'VARCHAR(100) BINARY', },
160: { name => 'updatetime',
161: type => 'INT UNSIGNED'},
162: { name => 'fullupdatetime',
163: type => 'INT UNSIGNED'},
164: ],
165: 'PRIMARY KEY' => ['student_id'],
166: 'KEY' => [{ columns => ['student (100)',
167: 'section (100)',
168: 'start',
169: 'end']},],
170: };
171: #
172: my $groupnames_table_def = {
173: id => $groupnames_table,
174: permanent => 'no',
175: columns => [{ name => 'group_id',
176: type => 'MEDIUMINT UNSIGNED',
177: restrictions => 'NOT NULL',
178: auto_inc => 'yes', },
179: { name => 'groupname',
180: type => 'VARCHAR(100) BINARY',
181: restrictions => 'NOT NULL UNIQUE'},
182: ],
183: 'PRIMARY KEY' => ['group_id'],
184: 'KEY' => [{ columns => ['groupname (100)',]},],
185: };
186: #
187: my $students_groups_table_def = {
188: id => $students_groups_table,
189: permanent => 'no',
190: columns => [{ name => 'student_id',
191: type => 'MEDIUMINT UNSIGNED',
192: restrictions => 'NOT NULL', },
193: { name => 'group_id',
194: type => 'MEDIUMINT UNSIGNED',
195: restrictions => 'NOT NULL', },
196: ],
197: 'PRIMARY KEY' => ['student_id','group_id'],
198: 'KEY' => [{ columns => ['student_id'] },
199: { columns => ['group_id'] },],
200: };
201: #
202: my $performance_table_def = {
203: id => $performance_table,
204: permanent => 'no',
205: columns => [{ name => 'symb_id',
206: type => 'MEDIUMINT UNSIGNED',
207: restrictions => 'NOT NULL' },
208: { name => 'student_id',
209: type => 'MEDIUMINT UNSIGNED',
210: restrictions => 'NOT NULL' },
211: { name => 'part_id',
212: type => 'MEDIUMINT UNSIGNED',
213: restrictions => 'NOT NULL' },
214: { name => 'part',
215: type => 'VARCHAR(100) BINARY',
216: restrictions => 'NOT NULL'},
217: { name => 'solved',
218: type => 'TINYTEXT' },
219: { name => 'tries',
220: type => 'SMALLINT UNSIGNED' },
221: { name => 'awarded',
222: type => 'REAL' },
223: { name => 'award',
224: type => 'TINYTEXT' },
225: { name => 'awarddetail',
226: type => 'TINYTEXT' },
227: { name => 'timestamp',
228: type => 'INT UNSIGNED'},
229: ],
230: 'PRIMARY KEY' => ['symb_id','student_id','part_id'],
231: 'KEY' => [{ columns=>['student_id'] },
232: { columns=>['symb_id'] },],
233: };
234: #
235: my $fulldump_part_table_def = {
236: id => $fulldump_part_table,
237: permanent => 'no',
238: columns => [
239: { name => 'symb_id',
240: type => 'MEDIUMINT UNSIGNED',
241: restrictions => 'NOT NULL' },
242: { name => 'part_id',
243: type => 'MEDIUMINT UNSIGNED',
244: restrictions => 'NOT NULL' },
245: { name => 'student_id',
246: type => 'MEDIUMINT UNSIGNED',
247: restrictions => 'NOT NULL' },
248: { name => 'transaction',
249: type => 'MEDIUMINT UNSIGNED',
250: restrictions => 'NOT NULL' },
251: { name => 'tries',
252: type => 'SMALLINT UNSIGNED',
253: restrictions => 'NOT NULL' },
254: { name => 'award',
255: type => 'TINYTEXT' },
256: { name => 'awarded',
257: type => 'REAL' },
258: { name => 'previous',
259: type => 'SMALLINT UNSIGNED' },
260: # { name => 'regrader',
261: # type => 'TINYTEXT' },
262: # { name => 'afterduedate',
263: # type => 'TINYTEXT' },
264: ],
265: 'PRIMARY KEY' => ['symb_id','part_id','student_id','transaction'],
266: 'KEY' => [
267: { columns=>['symb_id'] },
268: { columns=>['part_id'] },
269: { columns=>['student_id'] },
270: ],
271: };
272: #
273: my $fulldump_response_table_def = {
274: id => $fulldump_response_table,
275: permanent => 'no',
276: columns => [
277: { name => 'symb_id',
278: type => 'MEDIUMINT UNSIGNED',
279: restrictions => 'NOT NULL' },
280: { name => 'part_id',
281: type => 'MEDIUMINT UNSIGNED',
282: restrictions => 'NOT NULL' },
283: { name => 'response_id',
284: type => 'MEDIUMINT UNSIGNED',
285: restrictions => 'NOT NULL' },
286: { name => 'student_id',
287: type => 'MEDIUMINT UNSIGNED',
288: restrictions => 'NOT NULL' },
289: { name => 'transaction',
290: type => 'MEDIUMINT UNSIGNED',
291: restrictions => 'NOT NULL' },
292: { name => 'awarddetail',
293: type => 'TINYTEXT' },
294: # { name => 'message',
295: # type => 'CHAR BINARY'},
296: { name => 'response_specific',
297: type => 'TINYTEXT' },
298: { name => 'response_specific_value',
299: type => 'TINYTEXT' },
300: { name => 'response_specific_2',
301: type => 'TINYTEXT' },
302: { name => 'response_specific_value_2',
303: type => 'TINYTEXT' },
304: { name => 'submission',
305: type => 'TEXT'},
306: ],
307: 'PRIMARY KEY' => ['symb_id','part_id','response_id','student_id',
308: 'transaction'],
309: 'KEY' => [
310: { columns=>['symb_id'] },
311: { columns=>['part_id','response_id'] },
312: { columns=>['student_id'] },
313: ],
314: };
315: my $fulldump_timestamp_table_def = {
316: id => $fulldump_timestamp_table,
317: permanent => 'no',
318: columns => [
319: { name => 'symb_id',
320: type => 'MEDIUMINT UNSIGNED',
321: restrictions => 'NOT NULL' },
322: { name => 'student_id',
323: type => 'MEDIUMINT UNSIGNED',
324: restrictions => 'NOT NULL' },
325: { name => 'transaction',
326: type => 'MEDIUMINT UNSIGNED',
327: restrictions => 'NOT NULL' },
328: { name => 'timestamp',
329: type => 'INT UNSIGNED'},
330: ],
331: 'PRIMARY KEY' => ['symb_id','student_id','transaction'],
332: 'KEY' => [
333: { columns=>['symb_id'] },
334: { columns=>['student_id'] },
335: { columns=>['transaction'] },
336: ],
337: };
338: #
339: my $parameters_table_def = {
340: id => $parameters_table,
341: permanent => 'no',
342: columns => [{ name => 'symb_id',
343: type => 'MEDIUMINT UNSIGNED',
344: restrictions => 'NOT NULL' },
345: { name => 'student_id',
346: type => 'MEDIUMINT UNSIGNED',
347: restrictions => 'NOT NULL' },
348: { name => 'parameter',
349: type => 'TINYTEXT',
350: restrictions => 'NOT NULL' },
351: { name => 'value',
352: type => 'MEDIUMTEXT' },
353: ],
354: 'PRIMARY KEY' => ['symb_id','student_id','parameter (255)'],
355: };
356: #
357: my $weight_table_def = {
358: id => $weight_table,
359: permanent => 'no',
360: columns => [{ name => 'symb_id',
361: type => 'MEDIUMINT UNSIGNED',
362: restrictions => 'NOT NULL' },
363: { name => 'part_id',
364: type => 'MEDIUMINT UNSIGNED',
365: restrictions => 'NOT NULL' },
366: { name => 'weight',
367: type => 'REAL',
368: restrictions => 'NOT NULL' },
369: ],
370: 'PRIMARY KEY' => ['symb_id','part_id'],
371: };
372: #
373: # Create the tables
374: my $tableid;
375: $tableid = &Apache::lonmysql::create_table($symb_table_def);
376: if (! defined($tableid)) {
377: &Apache::lonnet::logthis("error creating symb_table: ".
378: &Apache::lonmysql::get_error());
379: return 1;
380: }
381: #
382: $tableid = &Apache::lonmysql::create_table($part_table_def);
383: if (! defined($tableid)) {
384: &Apache::lonnet::logthis("error creating part_table: ".
385: &Apache::lonmysql::get_error());
386: return 2;
387: }
388: #
389: $tableid = &Apache::lonmysql::create_table($student_table_def);
390: if (! defined($tableid)) {
391: &Apache::lonnet::logthis("error creating student_table: ".
392: &Apache::lonmysql::get_error());
393: return 3;
394: }
395: #
396: $tableid = &Apache::lonmysql::create_table($performance_table_def);
397: if (! defined($tableid)) {
398: &Apache::lonnet::logthis("error creating preformance_table: ".
399: &Apache::lonmysql::get_error());
400: return 5;
401: }
402: #
403: $tableid = &Apache::lonmysql::create_table($parameters_table_def);
404: if (! defined($tableid)) {
405: &Apache::lonnet::logthis("error creating parameters_table: ".
406: &Apache::lonmysql::get_error());
407: return 6;
408: }
409: #
410: $tableid = &Apache::lonmysql::create_table($fulldump_part_table_def);
411: if (! defined($tableid)) {
412: &Apache::lonnet::logthis("error creating fulldump_part_table: ".
413: &Apache::lonmysql::get_error());
414: return 7;
415: }
416: #
417: $tableid = &Apache::lonmysql::create_table($fulldump_response_table_def);
418: if (! defined($tableid)) {
419: &Apache::lonnet::logthis("error creating fulldump_response_table: ".
420: &Apache::lonmysql::get_error());
421: return 8;
422: }
423: $tableid = &Apache::lonmysql::create_table($fulldump_timestamp_table_def);
424: if (! defined($tableid)) {
425: &Apache::lonnet::logthis("error creating fulldump_timestamp_table: ".
426: &Apache::lonmysql::get_error());
427: return 9;
428: }
429: $tableid = &Apache::lonmysql::create_table($weight_table_def);
430: if (! defined($tableid)) {
431: &Apache::lonnet::logthis("error creating weight_table: ".
432: &Apache::lonmysql::get_error());
433: return 10;
434: }
435: $tableid = &Apache::lonmysql::create_table($groupnames_table_def);
436: if (! defined($tableid)) {
437: &Apache::lonnet::logthis("error creating groupnames_table: ".
438: &Apache::lonmysql::get_error());
439: return 11;
440: }
441: $tableid = &Apache::lonmysql::create_table($students_groups_table_def);
442: if (! defined($tableid)) {
443: &Apache::lonnet::logthis("error creating student_groups_table: ".
444: &Apache::lonmysql::get_error());
445: return 12;
446: }
447: return 0;
448: }
449:
450: =pod
451:
452: =head2 delete_caches
453:
454: Drops all of the tables in the local mysql cache associated with the
455: specified course id.
456:
457: TODO: The drops should be pushed into lonmysql to further isolate
458: mysql code from other modules.
459:
460: =cut
461: sub delete_caches {
462: my $courseid = shift;
463: $courseid = $env{'request.course.id'} if (! defined($courseid));
464: #
465: &setup_table_names($courseid);
466: #
467: my $dbh = &Apache::lonmysql::get_dbh();
468: foreach my $table (@Tables) {
469: my $command = 'DROP TABLE '.$table.';';
470: $dbh->do($command);
471: if ($dbh->err) {
472: &Apache::lonnet::logthis($command.' resulted in error: '.$dbh->errstr);
473: }
474: }
475: return;
476: }
477:
478:
479: my $have_read_part_table = 0;
480: my %ids_by_part;
481: my %parts_by_id;
482:
483: sub get_part_id {
484: my ($part) = @_;
485: $part = 0 if (! defined($part));
486: if (! $have_read_part_table) {
487: my @Result = &Apache::lonmysql::get_rows($part_table);
488: foreach (@Result) {
489: $ids_by_part{$_->[1]}=$_->[0];
490: }
491: $have_read_part_table = 1;
492: }
493: if (! exists($ids_by_part{$part})) {
494: &Apache::lonmysql::store_row($part_table,[undef,$part]);
495: undef(%ids_by_part);
496: my @Result = &Apache::lonmysql::get_rows($part_table);
497: foreach (@Result) {
498: $ids_by_part{$_->[1]}=$_->[0];
499: }
500: }
501: return $ids_by_part{$part} if (exists($ids_by_part{$part}));
502: return undef; # error
503: }
504:
505: sub get_part {
506: my ($part_id) = @_;
507: if (! exists($parts_by_id{$part_id}) ||
508: ! defined($parts_by_id{$part_id}) ||
509: $parts_by_id{$part_id} eq '') {
510: my @Result = &Apache::lonmysql::get_rows($part_table);
511: foreach (@Result) {
512: $parts_by_id{$_->[0]}=$_->[1];
513: }
514: }
515: return $parts_by_id{$part_id} if(exists($parts_by_id{$part_id}));
516: return undef; # error
517: }
518:
519:
520: my $have_read_symb_table = 0;
521: my %ids_by_symb;
522: my %symbs_by_id;
523:
524: sub get_symb_id {
525: my ($symb) = @_;
526: if (! $have_read_symb_table) {
527: my @Result = &Apache::lonmysql::get_rows($symb_table);
528: foreach (@Result) {
529: $ids_by_symb{$_->[1]}=$_->[0];
530: }
531: $have_read_symb_table = 1;
532: }
533: if (! exists($ids_by_symb{$symb})) {
534: &Apache::lonmysql::store_row($symb_table,[undef,$symb]);
535: undef(%ids_by_symb);
536: my @Result = &Apache::lonmysql::get_rows($symb_table);
537: foreach (@Result) {
538: $ids_by_symb{$_->[1]}=$_->[0];
539: }
540: }
541: return $ids_by_symb{$symb} if(exists( $ids_by_symb{$symb}));
542: return undef; # error
543: }
544:
545: sub get_symb {
546: my ($symb_id) = @_;
547: if (! exists($symbs_by_id{$symb_id}) ||
548: ! defined($symbs_by_id{$symb_id}) ||
549: $symbs_by_id{$symb_id} eq '') {
550: my @Result = &Apache::lonmysql::get_rows($symb_table);
551: foreach (@Result) {
552: $symbs_by_id{$_->[0]}=$_->[1];
553: }
554: }
555: return $symbs_by_id{$symb_id} if(exists( $symbs_by_id{$symb_id}));
556: return undef; # error
557: }
558:
559: my $have_read_student_table = 0;
560: my %ids_by_student;
561: my %students_by_id;
562:
563: sub get_student_id {
564: my ($sname,$sdom) = @_;
565: my $student = $sname.':'.$sdom;
566: if (! $have_read_student_table) {
567: my @Result = &Apache::lonmysql::get_rows($student_table);
568: foreach (@Result) {
569: $ids_by_student{$_->[1]}=$_->[0];
570: }
571: $have_read_student_table = 1;
572: }
573: if (! exists($ids_by_student{$student})) {
574: &populate_student_table();
575: undef(%ids_by_student);
576: undef(%students_by_id);
577: my @Result = &Apache::lonmysql::get_rows($student_table);
578: foreach (@Result) {
579: $ids_by_student{$_->[1]}=$_->[0];
580: }
581: }
582: return $ids_by_student{$student} if(exists( $ids_by_student{$student}));
583: return undef; # error
584: }
585:
586: sub get_student {
587: my ($student_id) = @_;
588: if (! exists($students_by_id{$student_id}) ||
589: ! defined($students_by_id{$student_id}) ||
590: $students_by_id{$student_id} eq '') {
591: my @Result = &Apache::lonmysql::get_rows($student_table);
592: foreach (@Result) {
593: $students_by_id{$_->[0]}=$_->[1];
594: }
595: }
596: return $students_by_id{$student_id} if(exists($students_by_id{$student_id}));
597: return undef; # error
598: }
599:
600: sub populate_student_table {
601: my ($courseid) = @_;
602: if (! defined($courseid)) {
603: $courseid = $env{'request.course.id'};
604: }
605: #
606: &setup_table_names($courseid);
607: &init_dbs($courseid,0);
608: my $dbh = &Apache::lonmysql::get_dbh();
609: my $request = 'INSERT IGNORE INTO '.$student_table.
610: "(student,section,start,end) VALUES ";
611: my $cdom = $env{'course.'.$courseid.'.domain'};
612: my $cnum = $env{'course.'.$courseid.'.num'};
613: my $classlist = &get_classlist($cdom,$cnum);
614: my $student_count=0;
615: while (my ($student,$data) = each %$classlist) {
616: my ($section,$start,$end) = ($data->[&CL_SECTION()],
617: $data->[&CL_START()],
618: $data->[&CL_END()]);
619: if ($section eq '' || $section =~ /^\s*$/) {
620: $section = 'none';
621: }
622: if (!defined($start)) { $start = 0; }
623: if (!defined($end)) { $end = 0; }
624: $request .= "('".$student."','".$section."','".$start."','".$end."'),";
625: $student_count++;
626: }
627: return if ($student_count == 0);
628: chop($request);
629: $dbh->do($request);
630: if ($dbh->err()) {
631: &Apache::lonnet::logthis("error ".$dbh->errstr().
632: " occurred executing \n".
633: $request);
634: }
635: return;
636: }
637:
638: my $have_read_groupnames_table = 0;
639: my %ids_by_groupname;
640:
641: sub get_group_id {
642: my ($groupname) = @_;
643: if (! $have_read_groupnames_table) {
644: my @Result = &Apache::lonmysql::get_rows($groupnames_table);
645: foreach (@Result) {
646: $ids_by_groupname{$_->[1]}=$_->[0];
647: }
648: $have_read_groupnames_table = 1;
649: }
650: if (! exists($ids_by_groupname{$groupname})) {
651: &populate_groupnames_table();
652: undef(%ids_by_groupname);
653: my @Result = &Apache::lonmysql::get_rows($groupnames_table);
654: foreach (@Result) {
655: $ids_by_groupname{$_->[1]}=$_->[0];
656: }
657: }
658: if (exists($ids_by_groupname{$groupname})) {
659: return $ids_by_groupname{$groupname};
660: }
661: return undef; # error
662: }
663:
664: sub populate_groupnames_table {
665: my ($courseid) = @_;
666: if (! defined($courseid)) {
667: $courseid = $env{'request.course.id'};
668: }
669: &setup_table_names($courseid);
670: &init_dbs($courseid,0);
671: my $dbh = &Apache::lonmysql::get_dbh();
672: my $cdom = $env{'course.'.$courseid.'.domain'};
673: my $cnum = $env{'course.'.$courseid.'.num'};
674: my %curr_groups = &Apache::longroup::coursegroups($cdom,$cnum);
675: return if (!%curr_groups);
676: my $request = 'INSERT IGNORE INTO '.$groupnames_table.
677: '(groupname) VALUES ';
678: foreach my $groupname (sort(keys(%curr_groups)),'none') {
679: $request .= "('".$groupname."'),";
680: }
681: chop($request);
682: $dbh->do($request);
683: if ($dbh->err()) {
684: &Apache::lonnet::logthis("error ".$dbh->errstr().
685: " occurred executing \n".
686: $request);
687: }
688: return;
689: }
690:
691: my $have_read_studentsgroups_table = 0;
692: my %groupids_by_studentid;
693:
694: sub get_students_groupids {
695: my ($student_id) = @_;
696: if (! $have_read_studentsgroups_table) {
697: my @Result = &Apache::lonmysql::get_rows($students_groups_table);
698: foreach (@Result) {
699: push(@{$groupids_by_studentid{$_->[0]}},$_->[1]);
700: }
701: $have_read_studentsgroups_table = 1;
702: }
703: if (! exists($groupids_by_studentid{$student_id})) {
704: &populate_students_groups_table();
705: undef(%groupids_by_studentid);
706: my @Result = &Apache::lonmysql::get_rows($students_groups_table);
707: foreach (@Result) {
708: push(@{$groupids_by_studentid{$_->[0]}},$_->[1]);
709: }
710: }
711: if (exists($groupids_by_studentid{$student_id})) {
712: if (ref($groupids_by_studentid{$student_id}) eq 'ARRAY') {
713: return @{$groupids_by_studentid{$student_id}};
714: }
715: }
716: return undef; # error
717: }
718:
719:
720: sub populate_students_groups_table {
721: my ($courseid) = @_;
722: if (! defined($courseid)) {
723: $courseid = $env{'request.course.id'};
724: }
725: #
726: &setup_table_names($courseid);
727: &init_dbs($courseid,0);
728: my $dbh = &Apache::lonmysql::get_dbh();
729: my $request = 'INSERT IGNORE INTO '.$students_groups_table.
730: "(student_id,group_id) VALUES ";
731: my $cdom = $env{'course.'.$courseid.'.domain'};
732: my $cnum = $env{'course.'.$courseid.'.num'};
733: my ($classlist,$keylist) = &get_classlist($cdom,$cnum);
734: my ($classgroups,$studentgroups) = &get_group_memberships($classlist,
735: $keylist,
736: $cdom,$cnum);
737: my $record_count = 0;
738: foreach my $student (sort(keys(%{$classgroups}))) {
739: my $student_id = &get_student_id(split(':',$student));
740: my @studentsgroups = &get_students_groups($student,'Active',$classgroups);
741: if (@studentsgroups < 1) {
742: @studentsgroups = ('none');
743: }
744: foreach my $groupname (@studentsgroups) {
745: my $group_id = &get_group_id($groupname);
746: $request .= "('".$student_id."','".$group_id."'),";
747: $record_count++;
748: }
749: }
750: return if ($record_count == 0);
751: chop($request);
752: $dbh->do($request);
753: if ($dbh->err()) {
754: &Apache::lonnet::logthis("error ".$dbh->errstr().
755: " occurred executing \n".
756: $request);
757: }
758: return;
759: }
760:
761: sub clear_internal_caches {
762: $have_read_part_table = 0;
763: undef(%ids_by_part);
764: undef(%parts_by_id);
765: $have_read_symb_table = 0;
766: undef(%ids_by_symb);
767: undef(%symbs_by_id);
768: $have_read_student_table = 0;
769: undef(%ids_by_student);
770: undef(%students_by_id);
771: $have_read_groupnames_table = 0;
772: undef(%ids_by_groupname);
773: }
774:
775: sub symb_is_for_task {
776: my ($symb) = @_;
777: return ($symb =~ /\.task$/);
778: }
779:
780:
781: sub update_full_student_data {
782: my ($sname,$sdom,$courseid) = @_;
783: #
784: # Set up database names
785: &setup_table_names($courseid);
786: #
787: my $student_id = &get_student_id($sname,$sdom);
788: my $student = $sname.':'.$sdom;
789: #
790: my $returnstatus = 'okay';
791: #
792: # Download students data
793: my $time_of_retrieval = time;
794: my @tmp = &Apache::lonnet::dumpstore($courseid,$sdom,$sname);
795: if (@tmp && $tmp[0] =~ /^error/) {
796: $returnstatus = 'error retrieving full student data';
797: return $returnstatus;
798: } elsif (! @tmp) {
799: $returnstatus = 'okay: no student data';
800: return $returnstatus;
801: }
802: my %studentdata = @tmp;
803: #
804: # Get database handle and clean out the tables
805: my $dbh = &Apache::lonmysql::get_dbh();
806: $dbh->do('DELETE FROM '.$fulldump_response_table.' WHERE student_id='.
807: $student_id);
808: $dbh->do('DELETE FROM '.$fulldump_part_table.' WHERE student_id='.
809: $student_id);
810: $dbh->do('DELETE FROM '.$fulldump_timestamp_table.' WHERE student_id='.
811: $student_id);
812: #
813: # Parse and store the data into a form we can handle
814: my $partdata;
815: my $respdata;
816: while (my ($key,$value) = each(%studentdata)) {
817: next if ($key =~ /^(\d+):(resource$|subnum$|keys:)/);
818: my ($transaction,$symb,$parameter) = split(':',$key);
819: $symb = &unescape($symb);
820: $parameter = &unescape($parameter);
821: my $symb_id = &get_symb_id($symb);
822: if ($parameter eq 'timestamp') {
823: # We can deal with 'timestamp' right away
824: my @timestamp_storage = ($symb_id,$student_id,
825: $transaction,$value);
826: my $store_command = 'INSERT IGNORE INTO '.$fulldump_timestamp_table.
827: " VALUES ('".join("','",@timestamp_storage)."');";
828: $dbh->do($store_command);
829: if ($dbh->err()) {
830: &Apache::lonnet::logthis('unable to execute '.$store_command);
831: &Apache::lonnet::logthis($dbh->errstr());
832: }
833: next;
834: } elsif ($parameter eq 'version') {
835: next;
836: } elsif (&symb_is_for_task($symb)) {
837: next if ($parameter !~ /^resource\.(.*)\.(award|
838: awarded|
839: solved|
840: submission|
841: portfiles|
842: status|
843: version|
844: regrader)\s*$/x);
845: my ($version_and_part_id, $field) = ($1,$2);
846:
847: next if ($version_and_part_id !~ /\./
848: && $field ne 'regrader' && $field ne 'version');
849:
850: my ($version, $part, $instance) =
851: split(/\./,$version_and_part_id);
852:
853: #skip and instance dimension or criteria specific data
854: next if (defined($instance)
855: && $instance ne $field
856: && $instance ne 'bridgetask');
857:
858: if (!defined($part)) {
859: $part = $version;
860: }
861: my $resp_id = &get_part_id('0');
862: my $part_id = &get_part_id($part);
863:
864: if ($field eq 'version') {
865: # for tasks each version is an attempt at it thus
866: # version -> tries
867: $partdata->{$symb_id}{$part_id}{$transaction}{'tries'}=
868: $value;
869: # at new version time the record gets reset thus adding a
870: # virtual response awarddetail of 'new_version'
871: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific'}='status';
872: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific_value'}='new_version';
873:
874: } elsif ($field eq 'award' || $field eq 'awarded'
875: || $field eq 'solved') {
876: $partdata->{$symb_id}{$part_id}{$transaction}{$field}=
877: $value;
878: } elsif ($field eq 'portfiles') {
879: # tasks only accepts portfolio submissions
880: $value = $dbh->quote($value);
881: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'submission'}=$value;
882: } elsif ($field eq 'status') {
883: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific'}=$field;
884: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific_value'}=$value;
885: } elsif ($field eq 'regrader') {
886: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific_2'}=$field;
887: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific_value_2'}=$value;
888: }
889: } elsif ($parameter =~ /^resource\.(.*)\.(tries|
890: award|
891: awarded|
892: previous|
893: solved|
894: awarddetail|
895: submission|
896: submissiongrading|
897: molecule)\s*$/x){
898: # we do not have enough information to store an
899: # entire row, so we save it up until later.
900: my ($part_and_resp_id,$field) = ($1,$2);
901: my ($part,$part_id,$resp,$resp_id);
902: if ($part_and_resp_id =~ /\./) {
903: ($part,$resp) = split(/\./,$part_and_resp_id);
904: $part_id = &get_part_id($part);
905: $resp_id = &get_part_id($resp);
906: } else {
907: $part_id = &get_part_id($part_and_resp_id);
908: }
909: # Deal with part specific data
910: if ($field =~ /^(tries|award|awarded|previous)$/) {
911: $partdata->{$symb_id}->{$part_id}->{$transaction}->{$field}=$value;
912: }
913: # deal with response specific data
914: if (defined($resp_id) &&
915: $field =~ /^(awarddetail|
916: submission|
917: submissiongrading|
918: molecule)$/x) {
919: if ($field eq 'submission') {
920: # We have to be careful with user supplied input.
921: # most of the time we are okay because it is escaped.
922: # However, there is one wrinkle: submissions which end in
923: # and odd number of '\' cause insert errors to occur.
924: # Best trap this somehow...
925: $value = $dbh->quote($value);
926: }
927: if ($field eq 'submissiongrading' ||
928: $field eq 'molecule') {
929: $respdata->{$symb_id}->{$part_id}->{$resp_id}->{$transaction}->{'response_specific'}=$field;
930: $respdata->{$symb_id}->{$part_id}->{$resp_id}->{$transaction}->{'response_specific_value'}=$value;
931: } else {
932: $respdata->{$symb_id}->{$part_id}->{$resp_id}->{$transaction}->{$field}=$value;
933: }
934: }
935: }
936: }
937: ##
938: ## Store the part data
939: my $store_command = 'INSERT IGNORE INTO '.$fulldump_part_table.
940: ' VALUES '."\n";
941: my $store_rows = 0;
942: while (my ($symb_id,$hash1) = each (%$partdata)) {
943: while (my ($part_id,$hash2) = each (%$hash1)) {
944: while (my ($transaction,$data) = each (%$hash2)) {
945: $store_command .= "('".join("','",$symb_id,$part_id,
946: $student_id,
947: $transaction,
948: $data->{'tries'},
949: $data->{'award'},
950: $data->{'awarded'},
951: $data->{'previous'})."'),";
952: $store_rows++;
953: }
954: }
955: }
956: if ($store_rows) {
957: chop($store_command);
958: $dbh->do($store_command);
959: if ($dbh->err) {
960: $returnstatus = 'error saving part data';
961: &Apache::lonnet::logthis('insert error '.$dbh->errstr());
962: &Apache::lonnet::logthis("While attempting\n".$store_command);
963: }
964: }
965: ##
966: ## Store the response data
967: $store_command = 'INSERT IGNORE INTO '.$fulldump_response_table.
968: ' VALUES '."\n";
969: $store_rows = 0;
970: while (my ($symb_id,$hash1) = each (%$respdata)) {
971: while (my ($part_id,$hash2) = each (%$hash1)) {
972: while (my ($resp_id,$hash3) = each (%$hash2)) {
973: while (my ($transaction,$data) = each (%$hash3)) {
974: my $submission = $data->{'submission'};
975: # We have to be careful with user supplied input.
976: # most of the time we are okay because it is escaped.
977: # However, there is one wrinkle: submissions which end in
978: # and odd number of '\' cause insert errors to occur.
979: # Best trap this somehow...
980: $submission = $dbh->quote($submission);
981: $store_command .= "('".
982: join("','",$symb_id,$part_id,
983: $resp_id,$student_id,
984: $transaction,
985: $data->{'awarddetail'},
986: $data->{'response_specific'},
987: $data->{'response_specific_value'},
988: $data->{'response_specific_2'},
989: $data->{'response_specific_value_2'}).
990: "',".$submission."),";
991: $store_rows++;
992: }
993: }
994: }
995: }
996: if ($store_rows) {
997: chop($store_command);
998: $dbh->do($store_command);
999: if ($dbh->err) {
1000: $returnstatus = 'error saving response data';
1001: &Apache::lonnet::logthis('insert error '.$dbh->errstr());
1002: &Apache::lonnet::logthis("While attempting\n".$store_command);
1003: }
1004: }
1005: ##
1006: ## Update the students "current" data in the performance
1007: ## and parameters tables.
1008: my ($status,undef) = &store_student_data
1009: ($sname,$sdom,$courseid,
1010: &Apache::lonnet::convert_dump_to_currentdump(\%studentdata));
1011: if ($returnstatus eq 'okay' && $status ne 'okay') {
1012: $returnstatus = 'error saving current data:'.$status;
1013: } elsif ($status ne 'okay') {
1014: $returnstatus .= ' error saving current data:'.$status;
1015: }
1016: ##
1017: ## Update the students time......
1018: if ($returnstatus eq 'okay') {
1019: &store_updatetime($student_id,$time_of_retrieval,$time_of_retrieval);
1020: if ($dbh->err) {
1021: if ($returnstatus eq 'okay') {
1022: $returnstatus = 'error updating student time';
1023: } else {
1024: $returnstatus = 'error updating student time';
1025: }
1026: }
1027: }
1028: return $returnstatus;
1029: }
1030:
1031:
1032: sub update_student_data {
1033: my ($sname,$sdom,$courseid) = @_;
1034: #
1035: # Set up database names
1036: &setup_table_names($courseid);
1037: #
1038: my $student_id = &get_student_id($sname,$sdom);
1039: my $student = $sname.':'.$sdom;
1040: #
1041: my $returnstatus = 'okay';
1042: #
1043: # Download students data
1044: my $time_of_retrieval = time;
1045: my %student_data = &Apache::lonnet::currentdump($courseid,$sdom,$sname);
1046: if (&Apache::lonnet::error(%student_data)) {
1047: &Apache::lonnet::logthis('error getting data for '.
1048: $sname.':'.$sdom.' in course '.$courseid.
1049: ':'.(%student_data)[0]);
1050: $returnstatus =(%student_data)[0] ;
1051: return ($returnstatus,undef);
1052: }
1053: if (scalar(keys(%student_data)) < 1) {
1054: return ('no data',undef);
1055: }
1056: my @Results = &store_student_data($sname,$sdom,$courseid,\%student_data);
1057: #
1058: # Set the students update time
1059: if ($Results[0] eq 'okay') {
1060: &store_updatetime($student_id,$time_of_retrieval);
1061: }
1062: #
1063: return @Results;
1064: }
1065:
1066: sub store_updatetime {
1067: my ($student_id,$updatetime,$fullupdatetime)=@_;
1068: my $values = '';
1069: if (defined($updatetime)) {
1070: $values = 'updatetime='.$updatetime.' ';
1071: }
1072: if (defined($fullupdatetime)) {
1073: if ($values ne '') {
1074: $values .= ',';
1075: }
1076: $values .= 'fullupdatetime='.$fullupdatetime.' ';
1077: }
1078: return if ($values eq '');
1079: my $dbh = &Apache::lonmysql::get_dbh();
1080: my $request = 'UPDATE '.$student_table.' SET '.$values.
1081: ' WHERE student_id='.$student_id.' LIMIT 1';
1082: $dbh->do($request);
1083: }
1084:
1085: sub store_student_data {
1086: my ($sname,$sdom,$courseid,$student_data) = @_;
1087: #
1088: my $student_id = &get_student_id($sname,$sdom);
1089: my $student = $sname.':'.$sdom;
1090: #
1091: my $returnstatus = 'okay';
1092: #
1093: # Remove all of the students data from the table
1094: my $dbh = &Apache::lonmysql::get_dbh();
1095: $dbh->do('DELETE FROM '.$performance_table.' WHERE student_id='.
1096: $student_id);
1097: $dbh->do('DELETE FROM '.$parameters_table.' WHERE student_id='.
1098: $student_id);
1099: #
1100: # Store away the data
1101: #
1102: my $starttime = Time::HiRes::time;
1103: my $elapsed = 0;
1104: my $rows_stored;
1105: my $store_parameters_command = 'INSERT IGNORE INTO '.$parameters_table.
1106: ' VALUES '."\n";
1107: my $num_parameters = 0;
1108: my $store_performance_command = 'INSERT IGNORE INTO '.$performance_table.
1109: ' VALUES '."\n";
1110: return ('error',undef) if (! defined($dbh));
1111: while (my ($current_symb,$param_hash) = each(%{$student_data})) {
1112: #
1113: # make sure the symb is set up properly
1114: my $symb_id = &get_symb_id($current_symb);
1115: #
1116: # Parameters
1117: while (my ($parameter,$value) = each(%$param_hash)) {
1118: if ($parameter !~ /(timestamp|resource\.(.*)\.(solved|tries|awarded|award|awarddetail|previous))/) {
1119: my $sql_parameter = "('".join("','",
1120: $symb_id,$student_id,
1121: $parameter)."',".
1122: $dbh->quote($value)."),\n";
1123: $num_parameters ++;
1124: if ($sql_parameter !~ /''/) {
1125: $store_parameters_command .= $sql_parameter;
1126: #$rows_stored++;
1127: }
1128: }
1129: }
1130: # Performance
1131: my %stored;
1132: while (my ($parameter,$value) = each(%$param_hash)) {
1133: next if ($parameter !~ /^resource\.(.*)\.(solved|awarded)$/);
1134: my $part = $1;
1135: my $which = $2;
1136: next if ($part =~ /\./);
1137: next if (exists($stored{$part}));
1138: $stored{$part}++;
1139: #
1140: my $part_id = &get_part_id($part);
1141: next if (!defined($part_id));
1142:
1143: my ($solved,$awarded);
1144: if ($which eq 'solved') {
1145: $solved = $value;
1146: $awarded = $param_hash->{'resource.'.$part.'.awarded'};
1147: } else {
1148: $solved = $param_hash->{'resource.'.$part.'.solved'};
1149: $awarded = $value;
1150: }
1151: my $award = $param_hash->{'resource.'.$part.'.award'};
1152: my $awarddetail = $param_hash->{'resource.'.$part.'.awarddetail'};
1153: my $timestamp = $param_hash->{'timestamp'};
1154: my $tries = $param_hash->{'resource.'.$part.'.tries'};
1155: if (&symb_is_for_task($current_symb)) {
1156: $tries = $param_hash->{'resource.'.$part.'.version'};
1157: }
1158: #
1159: $solved = '' if (! defined($solved));
1160: $tries = '' if (! defined($tries));
1161: $awarded = '' if (! defined($awarded));
1162: $award = '' if (! defined($award));
1163: $awarddetail = '' if (! defined($awarddetail));
1164: my $sql_performance =
1165: "('".join("','",$symb_id,$student_id,$part_id,$part,
1166: $solved,$tries,$awarded,$award,
1167: $awarddetail,$timestamp)."'),\n";
1168: $store_performance_command .= $sql_performance;
1169: $rows_stored++;
1170: }
1171: }
1172: if (! $rows_stored) { return ($returnstatus, undef); }
1173: $store_parameters_command =~ s|,\n$||;
1174: $store_performance_command =~ s|,\n$||;
1175: my $start = Time::HiRes::time;
1176: $dbh->do($store_performance_command);
1177: if ($dbh->err()) {
1178: &Apache::lonnet::logthis('performance bigass insert error:'.
1179: $dbh->errstr());
1180: &Apache::lonnet::logthis('command = '.$/.$store_performance_command);
1181: $returnstatus = 'error: unable to insert performance into database';
1182: return ($returnstatus,$student_data);
1183: }
1184: $dbh->do($store_parameters_command) if ($num_parameters>0);
1185: if ($dbh->err()) {
1186: &Apache::lonnet::logthis('parameters bigass insert error:'.
1187: $dbh->errstr());
1188: &Apache::lonnet::logthis('command = '.$/.$store_parameters_command);
1189: &Apache::lonnet::logthis('rows_stored = '.$rows_stored);
1190: &Apache::lonnet::logthis('student_id = '.$student_id);
1191: $returnstatus = 'error: unable to insert parameters into database';
1192: return ($returnstatus,$student_data);
1193: }
1194: $elapsed += Time::HiRes::time - $start;
1195: return ($returnstatus,$student_data);
1196: }
1197:
1198:
1199: sub ensure_tables_are_set_up {
1200: my ($courseid) = @_;
1201: $courseid = $env{'request.course.id'} if (! defined($courseid));
1202: #
1203: # Clean out package variables
1204: &setup_table_names($courseid);
1205: #
1206: # if the tables do not exist, make them
1207: my @CurrentTable = &Apache::lonmysql::tables_in_db();
1208: my ($found_symb,$found_student,$found_groups,$found_groupnames,$found_part,
1209: $found_performance,$found_parameters,$found_fulldump_part,
1210: $found_fulldump_response,$found_fulldump_timestamp,
1211: $found_weight);
1212: foreach (@CurrentTable) {
1213: $found_symb = 1 if ($_ eq $symb_table);
1214: $found_student = 1 if ($_ eq $student_table);
1215: $found_groups = 1 if ($_ eq $students_groups_table);
1216: $found_groupnames = 1 if ($_ eq $groupnames_table);
1217: $found_part = 1 if ($_ eq $part_table);
1218: $found_performance = 1 if ($_ eq $performance_table);
1219: $found_parameters = 1 if ($_ eq $parameters_table);
1220: $found_fulldump_part = 1 if ($_ eq $fulldump_part_table);
1221: $found_fulldump_response = 1 if ($_ eq $fulldump_response_table);
1222: $found_fulldump_timestamp = 1 if ($_ eq $fulldump_timestamp_table);
1223: $found_weight = 1 if ($_ eq $weight_table);
1224: }
1225: if (!$found_symb ||
1226: !$found_student || !$found_part ||
1227: !$found_performance || !$found_parameters ||
1228: !$found_fulldump_part || !$found_fulldump_response ||
1229: !$found_fulldump_timestamp || !$found_weight ) {
1230: if (&init_dbs($courseid,1)) {
1231: return 'error';
1232: }
1233: }
1234: }
1235:
1236: sub ensure_current_data {
1237: my ($sname,$sdom,$courseid) = @_;
1238: my $status = 'okay'; # return value
1239: #
1240: $courseid = $env{'request.course.id'} if (! defined($courseid));
1241: &ensure_tables_are_set_up($courseid);
1242: #
1243: # Get the update time for the user
1244: my $updatetime = 0;
1245: my $getuserdir = 1;
1246: my $modifiedtime = &Apache::lonnet::GetFileTimestamp
1247: ($sdom,$sname,$courseid.'.db',$getuserdir);
1248: #
1249: if ($modifiedtime == -1) {
1250: return ('no data',undef);
1251: }
1252:
1253: my $student_id = &get_student_id($sname,$sdom);
1254: &get_students_groupids($student_id);
1255: my @Result = &Apache::lonmysql::get_rows($student_table,
1256: "student_id ='$student_id'");
1257: my $data = undef;
1258: if (@Result) {
1259: $updatetime = $Result[0]->[6]; # Ack! This is dumb!
1260: }
1261: if ($modifiedtime > $updatetime) {
1262: ($status,$data) = &update_student_data($sname,$sdom,$courseid);
1263: }
1264: return ($status,$data);
1265: }
1266:
1267:
1268: sub ensure_current_full_data {
1269: my ($sname,$sdom,$courseid) = @_;
1270: my $status = 'okay'; # return value
1271: #
1272: $courseid = $env{'request.course.id'} if (! defined($courseid));
1273: &ensure_tables_are_set_up($courseid);
1274: #
1275: # Get the update time for the user
1276: my $getuserdir = 1;
1277: my $modifiedtime = &Apache::lonnet::GetFileTimestamp
1278: ($sdom,$sname,$courseid.'.db',$getuserdir);
1279: #
1280: my $student_id = &get_student_id($sname,$sdom);
1281: &get_students_groupids($student_id);
1282: my @Result = &Apache::lonmysql::get_rows($student_table,
1283: "student_id ='$student_id'");
1284: my $updatetime;
1285: if (@Result && ref($Result[0]) eq 'ARRAY') {
1286: $updatetime = $Result[0]->[7];
1287: }
1288: if (! defined($updatetime) || $modifiedtime > $updatetime) {
1289: $status = &update_full_student_data($sname,$sdom,$courseid);
1290: }
1291: return $status;
1292: }
1293:
1294:
1295: sub get_student_data_from_performance_cache {
1296: my ($sname,$sdom,$symb,$courseid)=@_;
1297: my $student = $sname.':'.$sdom if (defined($sname) && defined($sdom));
1298: &setup_table_names($courseid);
1299: #
1300: # Return hash
1301: my $studentdata;
1302: #
1303: my $dbh = &Apache::lonmysql::get_dbh();
1304: my $request = "SELECT ".
1305: "d.symb,a.part,a.solved,a.tries,a.awarded,a.award,a.awarddetail,".
1306: "a.timestamp ";
1307: if (defined($student)) {
1308: $request .= "FROM $student_table AS b ".
1309: "LEFT JOIN $performance_table AS a ON b.student_id=a.student_id ".
1310: # "LEFT JOIN $part_table AS c ON c.part_id = a.part_id ".
1311: "LEFT JOIN $symb_table AS d ON d.symb_id = a.symb_id ".
1312: "WHERE student='$student'";
1313: if (defined($symb) && $symb ne '') {
1314: $request .= " AND d.symb=".$dbh->quote($symb);
1315: }
1316: } elsif (defined($symb) && $symb ne '') {
1317: $request .= "FROM $symb_table as d ".
1318: "LEFT JOIN $performance_table AS a ON d.symb_id=a.symb_id ".
1319: # "LEFT JOIN $part_table AS c ON c.part_id = a.part_id ".
1320: "LEFT JOIN $student_table AS b ON b.student_id = a.student_id ".
1321: "WHERE symb='".$dbh->quote($symb)."'";
1322: }
1323: my $starttime = Time::HiRes::time;
1324: my $rows_retrieved = 0;
1325: my $sth = $dbh->prepare($request);
1326: $sth->execute();
1327: if ($sth->err()) {
1328: &Apache::lonnet::logthis("Unable to execute MySQL request:");
1329: &Apache::lonnet::logthis("\n".$request."\n");
1330: &Apache::lonnet::logthis("error is:".$sth->errstr());
1331: return undef;
1332: }
1333: foreach my $row (@{$sth->fetchall_arrayref}) {
1334: $rows_retrieved++;
1335: my ($symb,$part,$solved,$tries,$awarded,$award,$awarddetail,$time) =
1336: (@$row);
1337: my $base = 'resource.'.$part;
1338: $studentdata->{$symb}->{$base.'.solved'} = $solved;
1339: $studentdata->{$symb}->{$base.'.tries'} = $tries;
1340: $studentdata->{$symb}->{$base.'.awarded'} = $awarded;
1341: $studentdata->{$symb}->{$base.'.award'} = $award;
1342: $studentdata->{$symb}->{$base.'.awarddetail'} = $awarddetail;
1343: $studentdata->{$symb}->{'timestamp'} = $time if (defined($time) && $time ne '');
1344: }
1345: ## Get misc parameters
1346: $request = 'SELECT c.symb,a.parameter,a.value '.
1347: "FROM $student_table AS b ".
1348: "LEFT JOIN $parameters_table AS a ON b.student_id=a.student_id ".
1349: "LEFT JOIN $symb_table AS c ON c.symb_id = a.symb_id ".
1350: "WHERE student='$student'";
1351: if (defined($symb) && $symb ne '') {
1352: $request .= " AND c.symb=".$dbh->quote($symb);
1353: }
1354: $sth = $dbh->prepare($request);
1355: $sth->execute();
1356: if ($sth->err()) {
1357: &Apache::lonnet::logthis("Unable to execute MySQL request:");
1358: &Apache::lonnet::logthis("\n".$request."\n");
1359: &Apache::lonnet::logthis("error is:".$sth->errstr());
1360: if (defined($symb) && $symb ne '') {
1361: $studentdata = $studentdata->{$symb};
1362: }
1363: return $studentdata;
1364: }
1365: #
1366: foreach my $row (@{$sth->fetchall_arrayref}) {
1367: $rows_retrieved++;
1368: my ($symb,$parameter,$value) = (@$row);
1369: $studentdata->{$symb}->{$parameter} = $value;
1370: }
1371: #
1372: if (defined($symb) && $symb ne '') {
1373: $studentdata = $studentdata->{$symb};
1374: }
1375: return $studentdata;
1376: }
1377:
1378:
1379: sub get_current_state {
1380: my ($sname,$sdom,$symb,$courseid,$forcedownload)=@_;
1381: #
1382: $courseid = $env{'request.course.id'} if (! defined($courseid));
1383: #
1384: return () if (! defined($sname) || ! defined($sdom));
1385: #
1386: my ($status,$data) = &ensure_current_data($sname,$sdom,$courseid);
1387: # &Apache::lonnet::logthis
1388: # ('sname = '.$sname.
1389: # ' domain = '.$sdom.
1390: # ' status = '.$status.
1391: # ' data is '.(defined($data)?'defined':'undefined'));
1392: # while (my ($symb,$hash) = each(%$data)) {
1393: # &Apache::lonnet::logthis($symb."\n----------------------------------");
1394: # while (my ($key,$value) = each (%$hash)) {
1395: # &Apache::lonnet::logthis(" ".$key." = ".$value);
1396: # }
1397: # }
1398: #
1399: if (defined($data) && defined($symb) && ref($data->{$symb})) {
1400: return %{$data->{$symb}};
1401: } elsif (defined($data) && ! defined($symb) && ref($data)) {
1402: return %$data;
1403: }
1404: if ($status eq 'no data') {
1405: return ();
1406: } else {
1407: if ($status ne 'okay' && $status ne '') {
1408: &Apache::lonnet::logthis('status = '.$status);
1409: return ('error: '.$status,undef);
1410: }
1411: my $returnhash = &get_student_data_from_performance_cache($sname,$sdom,
1412: $symb,$courseid);
1413: return %$returnhash if (defined($returnhash));
1414: }
1415: return ();
1416: }
1417:
1418:
1419: sub get_problem_statistics {
1420: my ($Sections,$Groups,$status,$symb,$part,$courseid,$starttime,$endtime) = @_;
1421: return if (! defined($symb) || ! defined($part));
1422: $courseid = $env{'request.course.id'} if (! defined($courseid));
1423: #
1424: &setup_table_names($courseid);
1425: my $symb_id = &get_symb_id($symb);
1426: my $part_id = &get_part_id($part);
1427: my $stats_table = &temp_table_name($courseid,'problem_stats');
1428: #
1429: my $dbh = &Apache::lonmysql::get_dbh();
1430: return undef if (! defined($dbh));
1431: #
1432: # Clean out the table
1433: $dbh->do('DROP TABLE '.$stats_table); # May return an error
1434: my $request =
1435: 'CREATE TEMPORARY TABLE '.$stats_table.' '.
1436: 'SELECT a.student_id,a.solved,a.award,a.awarded,a.tries '.
1437: 'FROM '.$performance_table.' AS a ';
1438: #
1439: # See if we need to include some requirements on the students
1440: if ((defined($Sections) && lc($Sections->[0]) ne 'all') ||
1441: (defined($status) && lc($status) ne 'any')) {
1442: $request .= 'NATURAL LEFT JOIN '.$student_table.' AS b ';
1443: }
1444: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
1445: if (defined($groups_join)) {
1446: $request .= $groups_join;
1447: }
1448: $request .= ' WHERE a.symb_id='.$symb_id.' AND a.part_id='.$part_id;
1449: #
1450: # Limit the students included to those specified
1451: my ($section_limits,$enrollment_limits)=
1452: &limit_by_section_and_status($Sections,$status,'b');
1453: #
1454: # Limit by starttime and endtime
1455: my $time_requirements = undef;
1456: if (defined($starttime)) {
1457: $time_requirements .= 'a.timestamp>='.$starttime;
1458: if (defined($endtime)) {
1459: $time_requirements .= ' AND a.timestamp<='.$endtime;
1460: }
1461: } elsif (defined($endtime)) {
1462: $time_requirements .= 'a.timestamp<='.$endtime;
1463: }
1464: if (defined($time_requirements)) {
1465: $request .= ' AND '.$time_requirements;
1466: }
1467: if (defined($section_limits)) {
1468: $request .= ' AND '.$section_limits;
1469: }
1470: if (defined($enrollment_limits)) {
1471: $request .= ' AND '.$enrollment_limits;
1472: }
1473: # Limit by group, as required
1474: if (defined($group_limits)) {
1475: $request .= ' AND '.$group_limits;
1476: }
1477: #
1478: # Finally, execute the request to create the temporary table
1479: $dbh->do($request);
1480: #
1481: # Collect the first suite of statistics
1482: $request = 'SELECT COUNT(*),SUM(tries),'.
1483: 'AVG(tries),STD(tries) '.
1484: 'FROM '.$stats_table;
1485: my ($num,$tries,$mean,$STD) = &execute_SQL_request
1486: ($dbh,$request);
1487: #
1488: $request = 'SELECT MAX(tries),MIN(tries) FROM '.$stats_table.
1489: ' WHERE awarded>0';
1490: if (defined($time_requirements)) {
1491: $request .= ' AND '.$time_requirements;
1492: }
1493: my ($max,$min) = &execute_SQL_request($dbh,$request);
1494: #
1495: $request = 'SELECT SUM(awarded) FROM '.$stats_table;
1496: if (defined($time_requirements)) {
1497: $request .= ' AND '.$time_requirements;
1498: }
1499: my ($Solved) = &execute_SQL_request($dbh,$request);
1500: #
1501: $request = 'SELECT SUM(awarded) FROM '.$stats_table.
1502: " WHERE solved='correct_by_override'";
1503: if (defined($time_requirements)) {
1504: $request .= ' AND '.$time_requirements;
1505: }
1506: my ($solved) = &execute_SQL_request($dbh,$request);
1507: #
1508: $Solved -= $solved;
1509: #
1510: $num = 0 if (! defined($num));
1511: $tries = 0 if (! defined($tries));
1512: $max = 0 if (! defined($max));
1513: $min = 0 if (! defined($min));
1514: $STD = 0 if (! defined($STD));
1515: $Solved = 0 if (! defined($Solved) || $Solved < 0);
1516: $solved = 0 if (! defined($solved));
1517: #
1518: # Compute the more complicated statistics
1519: my $DegOfDiff = 'nan';
1520: $DegOfDiff = 1-($Solved)/$tries if ($tries>0);
1521: #
1522: my $SKEW = 'nan';
1523: my $wrongpercent = 0;
1524: my $numwrong = 'nan';
1525: if ($num > 0) {
1526: ($SKEW) = &execute_SQL_request($dbh,'SELECT SQRT(SUM('.
1527: 'POWER(tries - '.$STD.',3)'.
1528: '))/'.$num.' FROM '.$stats_table);
1529: $numwrong = $num-$Solved;
1530: $wrongpercent=int(10*100*$numwrong/$num)/10;
1531: }
1532: #
1533: # Drop the temporary table
1534: $dbh->do('DROP TABLE '.$stats_table); # May return an error
1535: #
1536: # Return result
1537: return { num_students => $num,
1538: tries => $tries,
1539: max_tries => $max,
1540: min_tries => $min,
1541: mean_tries => $mean,
1542: std_tries => $STD,
1543: skew_tries => $SKEW,
1544: num_solved => $Solved,
1545: num_override => $solved,
1546: num_wrong => $numwrong,
1547: per_wrong => $wrongpercent,
1548: deg_of_diff => $DegOfDiff };
1549: }
1550:
1551: ##
1552: ## This is a helper for get_statistics
1553: sub execute_SQL_request {
1554: my ($dbh,$request)=@_;
1555: # &Apache::lonnet::logthis($request);
1556: my $sth = $dbh->prepare($request);
1557: if (!$sth) {
1558: die($dbh->errstr . " SQL: $request");
1559: }
1560: $sth->execute();
1561: my $row = $sth->fetchrow_arrayref();
1562: if (ref($row) eq 'ARRAY' && scalar(@$row)>0) {
1563: return @$row;
1564: }
1565: return ();
1566: }
1567:
1568:
1569: sub populate_weight_table {
1570: my ($courseid) = @_;
1571: if (! defined($courseid)) {
1572: $courseid = $env{'request.course.id'};
1573: }
1574: #
1575: &setup_table_names($courseid);
1576: my $navmap = Apache::lonnavmaps::navmap->new();
1577: if (!defined($navmap)) {
1578: &Apache::lonnet::logthis('loncoursedata::populate_weight_table:'.$/.
1579: ' unable to get navmaps resource'.$/.
1580: ' '.join(' ',(caller)));
1581: return;
1582: }
1583: my @sequences = $navmap->retrieveResources(undef,
1584: sub { shift->is_map(); },1,0,1);
1585: my @resources;
1586: foreach my $seq (@sequences) {
1587: push(@resources,$navmap->retrieveResources($seq,
1588: sub {shift->is_problem();},
1589: 0,0,0));
1590: }
1591: if (! scalar(@resources)) {
1592: &Apache::lonnet::logthis('loncoursedata::populate_weight_table:'.$/.
1593: ' no resources returned for '.$courseid);
1594: return;
1595: }
1596: # Since we use lonnet::EXT to retrieve problem weights,
1597: # to ensure current data we must clear the caches out.
1598: &Apache::lonnet::clear_EXT_cache_status();
1599: my $dbh = &Apache::lonmysql::get_dbh();
1600: my $request = 'INSERT IGNORE INTO '.$weight_table.
1601: "(symb_id,part_id,weight) VALUES ";
1602: my $weight;
1603: foreach my $res (@resources) {
1604: my $symb_id = &get_symb_id($res->symb);
1605: foreach my $part (@{$res->parts}) {
1606: my $part_id = &get_part_id($part);
1607: $weight = &Apache::lonnet::EXT('resource.'.$part.'.weight',
1608: $res->symb,
1609: undef,undef,undef);
1610: if (!defined($weight) || ($weight eq '')) {
1611: $weight=1;
1612: }
1613: $request .= "('".$symb_id."','".$part_id."','".$weight."'),";
1614: }
1615: }
1616: $request =~ s/(,)$//;
1617: # &Apache::lonnet::logthis('request = '.$/.$request);
1618: $dbh->do($request);
1619: if ($dbh->err()) {
1620: &Apache::lonnet::logthis("error ".$dbh->errstr().
1621: " occurred executing \n".
1622: $request);
1623: }
1624: return;
1625: }
1626:
1627: sub limit_by_start_end_time {
1628: my ($starttime,$endtime,$table) = @_;
1629: my $time_requirements = undef;
1630: if (defined($starttime)) {
1631: $time_requirements .= $table.".timestamp>='".$starttime."'";
1632: if (defined($endtime)) {
1633: $time_requirements .= " AND ".$table.".timestamp<='".$endtime."'";
1634: }
1635: } elsif (defined($endtime)) {
1636: $time_requirements .= $table.".timestamp<='".$endtime."'";
1637: }
1638: return $time_requirements;
1639: }
1640:
1641:
1642: sub limit_by_section_and_status {
1643: my ($Sections,$enrollment,$tablename) = @_;
1644: my $student_requirements = undef;
1645: if ( (defined($Sections) && $Sections->[0] ne 'all')) {
1646: $student_requirements = '('.
1647: join(' OR ', map { $tablename.".section='".$_."'" } @$Sections
1648: ).')';
1649: }
1650: my $enrollment_requirements=undef;
1651: if (defined($enrollment) && $enrollment ne 'Any') {
1652: my $now = time();
1653: if ( $enrollment eq 'Future' ) {
1654: $enrollment_requirements =
1655: "( $tablename.start > $now AND ".
1656: "( $tablename.end = 0 OR $tablename.end > $now))";
1657: } elsif ( $enrollment eq 'Active' ) {
1658: $enrollment_requirements =
1659: "(( $tablename.start = 0 OR $tablename.start < $now ) AND ".
1660: " ( $tablename.end = 0 OR $tablename.end > $now ))";
1661: } elsif ( $enrollment eq 'Expired' ) {
1662: $enrollment_requirements =
1663: "(( $tablename.start < $now ) AND ".
1664: " ( $tablename.end < $now ))";
1665: }
1666: }
1667: return ($student_requirements,$enrollment_requirements);
1668: }
1669:
1670:
1671:
1672: sub limit_by_group {
1673: my ($Groups,$stutable,$grptable,$stugrptab) = @_;
1674: my $groups_join = undef;
1675: my $group_limits = undef;
1676: if ( (defined($Groups) && $Groups->[0] ne 'all')) {
1677: $groups_join =
1678: ' LEFT JOIN '.$students_groups_table.
1679: ' AS '.$stugrptab.' ON '.
1680: $stugrptab.'.student_id = '.$stutable.'.student_id'.
1681: ' LEFT JOIN '.$groupnames_table.
1682: ' AS '.$grptable.' ON '.
1683: $stugrptab.'.group_id = '.$grptable.'.group_id ';
1684: $group_limits =
1685: ' ('.
1686: join(' OR ', map { "$grptable.groupname='".$_."'" } @$Groups
1687: ).')';
1688: }
1689: return ($groups_join,$group_limits);
1690: }
1691:
1692:
1693: sub RNK_student { return 0; };
1694: sub RNK_score { return 1; };
1695:
1696: sub rank_students_by_scores_on_resources {
1697: my ($resources,$Sections,$Groups,$enrollment,$courseid,$starttime,$endtime,
1698: $has_award_for) = @_;
1699: return if (! defined($resources) || ! ref($resources) eq 'ARRAY');
1700: if (! defined($courseid)) {
1701: $courseid = $env{'request.course.id'};
1702: }
1703: #
1704: &setup_table_names($courseid);
1705: my $dbh = &Apache::lonmysql::get_dbh();
1706: my ($section_limits,$enrollment_limits)=
1707: &limit_by_section_and_status($Sections,$enrollment,'b');
1708: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
1709: my $symb_limits = '('.join(' OR ',map {'a.symb_id='.&get_symb_id($_);
1710: } @$resources
1711: ).')';
1712: my ($award_col, $award_join, $award_clause) = ('', '', '');
1713: if ($has_award_for) {
1714: my $resource_id = &get_symb_id($has_award_for);
1715: $award_col = ", perf.awarded";
1716: $award_join = "LEFT JOIN $performance_table AS perf ON perf.symb_id"
1717: ." = $resource_id AND perf.student_id = b.student_id ";
1718: $award_clause = "AND perf.awarded IS NOT NULL";
1719: }
1720: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
1721: my $request = "SELECT b.student,SUM(a.awarded*w.weight) AS score "
1722: ."$award_col FROM $performance_table AS a ".
1723: "NATURAL LEFT JOIN $weight_table AS w ".
1724: "LEFT JOIN $student_table AS b ON a.student_id=b.student_id ".
1725: "$award_join $groups_join ";
1726: my $limits;
1727: if (defined($section_limits)) {
1728: $limits .= $section_limits.' AND ';
1729: }
1730: if (defined($enrollment_limits)) {
1731: $limits .= $enrollment_limits.' AND ';
1732: }
1733: if (defined($time_limits)) {
1734: $limits .= $time_limits.' AND ';
1735: }
1736: if ($symb_limits ne '()') {
1737: $limits .= $symb_limits.' AND ';
1738: }
1739: if (defined($group_limits)) {
1740: $limits .= $group_limits.' AND ';
1741: }
1742: if ($limits) {
1743: $limits =~ s/( AND )$//; # Remove extra conjunction
1744: $request .= "WHERE $limits";
1745: }
1746: $request .= " $award_clause GROUP BY a.student_id ORDER BY score";
1747: #&Apache::lonnet::logthis('request = '.$/.$request);
1748: my $sth = $dbh->prepare($request) or die "Can't prepare $request";
1749: $sth->execute();
1750: my $rows = $sth->fetchall_arrayref();
1751: return ($rows);
1752: }
1753:
1754: sub get_sum_of_scores {
1755: my ($symb,$part,$students,$courseid,$starttime,$endtime) = @_;
1756: if (! defined($courseid)) {
1757: $courseid = $env{'request.course.id'};
1758: }
1759: if (defined($students) &&
1760: ((@$students == 0) ||
1761: (@$students == 1 && (! defined($students->[0]) ||
1762: $students->[0] eq ''))
1763: )
1764: ){
1765: undef($students);
1766: }
1767: #
1768: &setup_table_names($courseid);
1769: my $dbh = &Apache::lonmysql::get_dbh();
1770: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
1771: my $request = 'SELECT SUM(a.awarded*w.weight),SUM(w.weight) FROM '.
1772: $performance_table.' AS a '.
1773: 'NATURAL LEFT JOIN '.$weight_table.' AS w ';
1774: $request .= 'WHERE a.symb_id='.&get_symb_id($symb).
1775: ' AND a.part_id='.&get_part_id($part);
1776: if (defined($time_limits)) {
1777: $request .= ' AND '.$time_limits;
1778: }
1779: if (defined($students)) {
1780: $request .= ' AND ('.
1781: join(' OR ',map {'a.student_id='.&get_student_id(split(':',$_));
1782: } @$students).
1783: ')';
1784: }
1785: my $sth = $dbh->prepare($request);
1786: $sth->execute();
1787: my $rows = $sth->fetchrow_arrayref();
1788: if ($dbh->err) {
1789: &Apache::lonnet::logthis('error 1 = '.$dbh->errstr());
1790: &Apache::lonnet::logthis('prepared then executed, fetchrow_arrayrefed'.
1791: $/.$request);
1792: return (undef,undef);
1793: }
1794: return ($rows->[0],$rows->[1]);
1795: }
1796:
1797:
1798: sub score_stats {
1799: my ($Sections,$Groups,$enrollment,$symbs,$starttime,$endtime,$courseid)=@_;
1800: if (! defined($courseid)) {
1801: $courseid = $env{'request.course.id'};
1802: }
1803: #
1804: &setup_table_names($courseid);
1805: my $dbh = &Apache::lonmysql::get_dbh();
1806: #
1807: my ($section_limits,$enrollment_limits)=
1808: &limit_by_section_and_status($Sections,$enrollment,'b');
1809: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
1810: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
1811: my @Symbids = map { &get_symb_id($_); } @{$symbs};
1812: #
1813: my $stats_table = &temp_table_name($courseid,'problem_stats');
1814: my $symb_restriction = join(' OR ',map {'a.symb_id='.$_;} @Symbids);
1815: my $request = 'DROP TABLE '.$stats_table;
1816: $dbh->do($request);
1817: $request =
1818: 'CREATE TEMPORARY TABLE '.$stats_table.' '.
1819: 'SELECT a.student_id,'.
1820: 'SUM(a.awarded*w.weight) AS score FROM '.
1821: $performance_table.' AS a '.
1822: 'NATURAL LEFT JOIN '.$weight_table.' AS w '.
1823: 'LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id '.
1824: $groups_join;
1825: my $limit = ' WHERE ('.$symb_restriction.')';
1826: if ($time_limits) {
1827: $limit .= ' AND '.$time_limits;
1828: }
1829: if ($section_limits) {
1830: $limit .= ' AND '.$section_limits;
1831: }
1832: if ($enrollment_limits) {
1833: $limit .= ' AND '.$enrollment_limits;
1834: }
1835: if ($group_limits) {
1836: $limit .= ' AND '.$group_limits;
1837: }
1838: $request .= $limit.' GROUP BY a.student_id';
1839: # &Apache::lonnet::logthis('request = '.$/.$request);
1840: my $sth = $dbh->prepare($request);
1841: $sth->execute();
1842: $request =
1843: 'SELECT AVG(score),STD(score),MAX(score),MIN(score),COUNT(score) '.
1844: 'FROM '.$stats_table;
1845: my ($ave,$std,$max,$min,$count) = &execute_SQL_request($dbh,$request);
1846: # &Apache::lonnet::logthis('request = '.$/.$request);
1847:
1848: $request = 'SELECT SUM(weight) FROM '.$weight_table.
1849: ' AS a WHERE ('.$symb_restriction.')';
1850: my ($max_possible) = &execute_SQL_request($dbh,$request);
1851: # &Apache::lonnet::logthis('request = '.$/.$request);
1852: return($min,$max,$ave,$std,$count,$max_possible);
1853: }
1854:
1855:
1856:
1857: sub count_stats {
1858: my ($Sections,$Groups,$enrollment,$symbs,$starttime,$endtime,$courseid)=@_;
1859: if (! defined($courseid)) {
1860: $courseid = $env{'request.course.id'};
1861: }
1862: #
1863: &setup_table_names($courseid);
1864: my $dbh = &Apache::lonmysql::get_dbh();
1865: #
1866: my ($section_limits,$enrollment_limits)=
1867: &limit_by_section_and_status($Sections,$enrollment,'b');
1868: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
1869: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
1870: my @Symbids = map { &get_symb_id($_); } @{$symbs};
1871: #
1872: my $stats_table = &temp_table_name($courseid,'problem_stats');
1873: my $symb_restriction = join(' OR ',map {'a.symb_id='.$_;} @Symbids);
1874: my $request = 'DROP TABLE '.$stats_table;
1875: $dbh->do($request);
1876: $request =
1877: 'CREATE TEMPORARY TABLE '.$stats_table.' '.
1878: 'SELECT a.student_id,'.
1879: 'SUM(a.awarded) AS count FROM '.
1880: $performance_table.' AS a '.
1881: 'LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id '.
1882: $groups_join;
1883: my $limit = ' WHERE ('.$symb_restriction.')';
1884: if ($time_limits) {
1885: $limit .= ' AND '.$time_limits;
1886: }
1887: if ($section_limits) {
1888: $limit .= ' AND '.$section_limits;
1889: }
1890: if ($enrollment_limits) {
1891: $limit .= ' AND '.$enrollment_limits;
1892: }
1893: if ($group_limits) {
1894: $limit .= ' AND '.$group_limits;
1895: }
1896: $request .= $limit.' GROUP BY a.student_id';
1897: # &Apache::lonnet::logthis('request = '.$/.$request);
1898: my $sth = $dbh->prepare($request);
1899: $sth->execute();
1900: $request =
1901: 'SELECT AVG(count),STD(count),MAX(count),MIN(count),COUNT(count) '.
1902: 'FROM '.$stats_table;
1903: my ($ave,$std,$max,$min,$count) = &execute_SQL_request($dbh,$request);
1904: # &Apache::lonnet::logthis('request = '.$/.$request);
1905: return($min,$max,$ave,$std,$count);
1906: }
1907:
1908:
1909: sub get_student_data {
1910: my ($students,$courseid) = @_;
1911: $courseid = $env{'request.course.id'} if (! defined($courseid));
1912: &setup_table_names($courseid);
1913: my $dbh = &Apache::lonmysql::get_dbh();
1914: return undef if (! defined($dbh));
1915: my $request = 'SELECT '.
1916: 'student_id, student '.
1917: 'FROM '.$student_table;
1918: if (defined($students)) {
1919: $request .= ' WHERE ('.
1920: join(' OR ', map {'student_id='.
1921: &get_student_id($_->{'username'},
1922: $_->{'domain'})
1923: } @$students
1924: ).')';
1925: }
1926: $request.= ' ORDER BY student_id';
1927: my $sth = $dbh->prepare($request);
1928: $sth->execute();
1929: if ($dbh->err) {
1930: &Apache::lonnet::logthis('error 2 = '.$dbh->errstr());
1931: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
1932: return undef;
1933: }
1934: my $dataset = $sth->fetchall_arrayref();
1935: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
1936: return $dataset;
1937: }
1938: }
1939:
1940: sub RD_student_id { return 0; }
1941: sub RD_awarddetail { return 1; }
1942: sub RD_response_eval { return 2; }
1943: sub RD_response_eval_2 { return 3; }
1944: sub RD_submission { return 4; }
1945: sub RD_timestamp { return 5; }
1946: sub RD_tries { return 6; }
1947: sub RD_sname { return 7; }
1948:
1949: sub get_response_data {
1950: my ($Sections,$Groups,$enrollment,$symb,$response,$courseid) = @_;
1951: return undef if (! defined($symb) ||
1952: ! defined($response));
1953: $courseid = $env{'request.course.id'} if (! defined($courseid));
1954: #
1955: &setup_table_names($courseid);
1956: my $symb_id = &get_symb_id($symb);
1957: if (! defined($symb_id)) {
1958: &Apache::lonnet::logthis('Unable to find symb for '.$symb.' in '.$courseid);
1959: return undef;
1960: }
1961: my $response_id = &get_part_id($response);
1962: if (! defined($response_id)) {
1963: &Apache::lonnet::logthis('Unable to find id for '.$response.' in '.$courseid);
1964: return undef;
1965: }
1966: #
1967: my $dbh = &Apache::lonmysql::get_dbh();
1968: return undef if (! defined($dbh));
1969: #
1970: my ($student_requirements,$enrollment_requirements) =
1971: &limit_by_section_and_status($Sections,$enrollment,'d');
1972: my ($groups_join,$group_limits) = &limit_by_group($Groups,'d','e','f');
1973: my $request = 'SELECT '.
1974: 'a.student_id, a.awarddetail, a.response_specific_value, '.
1975: 'a.response_specific_value_2, a.submission, b.timestamp, '.
1976: 'c.tries, d.student '.
1977: 'FROM '.$fulldump_response_table.' AS a '.
1978: 'LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
1979: 'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
1980: 'a.transaction = b.transaction '.
1981: 'LEFT JOIN '.$fulldump_part_table.' AS c '.
1982: 'ON a.symb_id=c.symb_id AND a.student_id=c.student_id AND '.
1983: 'a.part_id=c.part_id AND a.transaction = c.transaction '.
1984: 'LEFT JOIN '.$student_table.' AS d '.
1985: 'ON a.student_id=d.student_id '.
1986: $groups_join;
1987: my $limit = ' WHERE '.
1988: 'a.symb_id='.$symb_id.' AND a.response_id='.$response_id;
1989: if (defined($student_requirements)) {
1990: $limit .= ' AND '.$student_requirements;
1991: }
1992: if (defined($enrollment_requirements)) {
1993: $limit .= ' AND '.$enrollment_requirements;
1994: }
1995: if (defined($group_limits)) {
1996: $limit .= ' AND '.$group_limits;
1997: }
1998: $request .= $limit.' ORDER BY b.timestamp';
1999: # &Apache::lonnet::logthis("request =\n".$request);
2000: my $sth = $dbh->prepare($request);
2001: $sth->execute();
2002: if ($dbh->err) {
2003: &Apache::lonnet::logthis('error 3 = '.$dbh->errstr());
2004: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2005: return undef;
2006: }
2007: my $dataset = $sth->fetchall_arrayref();
2008: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2009: # Clear the \'s from around the submission
2010: for (my $i =0;$i<scalar(@$dataset);$i++) {
2011: $dataset->[$i]->[&RD_submission()] =~ s/(\'$|^\')//g;
2012: }
2013: return $dataset;
2014: }
2015: }
2016:
2017:
2018: sub RDs_awarddetail { return 3; }
2019: sub RDs_submission { return 2; }
2020: sub RDs_timestamp { return 1; }
2021: sub RDs_tries { return 0; }
2022: sub RDs_awarded { return 4; }
2023: sub RDs_response_eval { return 5; }
2024: sub RDs_response_eval_2 { return 6; }
2025: sub RDs_part_award { return 7; }
2026:
2027: sub get_response_data_by_student {
2028: my ($student,$symb,$response,$courseid) = @_;
2029: return undef if (! defined($symb) ||
2030: ! defined($response));
2031: $courseid = $env{'request.course.id'} if (! defined($courseid));
2032: #
2033: &setup_table_names($courseid);
2034: my $symb_id = &get_symb_id($symb);
2035: my $response_id = &get_part_id($response);
2036: #
2037: my $student_id = &get_student_id($student->{'username'},
2038: $student->{'domain'});
2039: #
2040: my $dbh = &Apache::lonmysql::get_dbh();
2041: return undef if (! defined($dbh));
2042: my $request = 'SELECT '.
2043: 'c.tries, b.timestamp, a.submission, a.awarddetail, c.awarded, '.
2044: 'a.response_specific_value, a.response_specific_value_2, c.award '.
2045: 'FROM '.$fulldump_response_table.' AS a '.
2046: 'LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
2047: 'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
2048: 'a.transaction = b.transaction '.
2049: 'LEFT JOIN '.$fulldump_part_table.' AS c '.
2050: 'ON a.symb_id=c.symb_id AND a.student_id=c.student_id AND '.
2051: 'a.part_id=c.part_id AND a.transaction = c.transaction '.
2052: 'LEFT JOIN '.$student_table.' AS d '.
2053: 'ON a.student_id=d.student_id '.
2054: 'LEFT JOIN '.$performance_table.' AS e '.
2055: 'ON a.symb_id=e.symb_id AND a.part_id=e.part_id AND '.
2056: 'a.student_id=e.student_id AND c.tries=e.tries '.
2057: 'WHERE '.
2058: 'a.symb_id='.$symb_id.' AND a.response_id='.$response_id.
2059: ' AND a.student_id='.$student_id.' ORDER BY b.timestamp';
2060: # &Apache::lonnet::logthis("request =\n".$request);
2061: my $sth = $dbh->prepare($request);
2062: $sth->execute();
2063: if ($dbh->err) {
2064: &Apache::lonnet::logthis('error 4 = '.$dbh->errstr());
2065: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2066: return undef;
2067: }
2068: my $dataset = $sth->fetchall_arrayref();
2069: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2070: # Clear the \'s from around the submission
2071: for (my $i =0;$i<scalar(@$dataset);$i++) {
2072: $dataset->[$i]->[&RDs_submission] =~ s/(\'$|^\')//g;
2073: }
2074: return $dataset;
2075: }
2076: return undef; # error occurred
2077: }
2078:
2079: sub RT_student_id { return 0; }
2080: sub RT_awarded { return 1; }
2081: sub RT_tries { return 2; }
2082: sub RT_timestamp { return 3; }
2083:
2084: sub get_response_time_data {
2085: my ($sections,$groups,$enrollment,$symb,$part,$courseid) = @_;
2086: return undef if (! defined($symb) ||
2087: ! defined($part));
2088: $courseid = $env{'request.course.id'} if (! defined($courseid));
2089: #
2090: &setup_table_names($courseid);
2091: my $symb_id = &get_symb_id($symb);
2092: if (! defined($symb_id)) {
2093: &Apache::lonnet::logthis('Unable to find symb for '.$symb.' in '.$courseid);
2094: return undef;
2095: }
2096: my $part_id = &get_part_id($part);
2097: if (! defined($part_id)) {
2098: &Apache::lonnet::logthis('Unable to find id for '.$part.' in '.$courseid);
2099: return undef;
2100: }
2101: #
2102: my $dbh = &Apache::lonmysql::get_dbh();
2103: return undef if (! defined($dbh));
2104: my ($student_requirements,$enrollment_requirements) =
2105: &limit_by_section_and_status($sections,$enrollment,'d');
2106: my ($groups_join,$group_limits) = &limit_by_group($groups,'d','e','f');
2107: my $request = 'SELECT '.
2108: 'a.student_id, a.awarded, a.tries, b.timestamp '.
2109: 'FROM '.$fulldump_part_table.' AS a '.
2110: 'LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
2111: 'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
2112: 'a.transaction = b.transaction '.
2113: 'LEFT JOIN '.$student_table.' as d '.
2114: 'ON a.student_id=d.student_id '.
2115: $groups_join;
2116: my $limit = ' WHERE '.
2117: 'a.symb_id='.$symb_id.' AND a.part_id='.$part_id;
2118: if (defined($student_requirements)) {
2119: $limit .= ' AND '.$student_requirements;
2120: }
2121: if (defined($enrollment_requirements)) {
2122: $limit .= ' AND '.$enrollment_requirements;
2123: }
2124: if (defined($group_limits)) {
2125: $limit .= ' AND '.$group_limits;
2126: }
2127: $request .= $limit.' ORDER BY b.timestamp';
2128: # &Apache::lonnet::logthis("request =\n".$request);
2129: my $sth = $dbh->prepare($request);
2130: $sth->execute();
2131: if ($dbh->err) {
2132: &Apache::lonnet::logthis('error 5 = '.$dbh->errstr());
2133: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2134: return undef;
2135: }
2136: my $dataset = $sth->fetchall_arrayref();
2137: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2138: return $dataset;
2139: }
2140:
2141: }
2142:
2143: sub get_student_scores {
2144: my ($sections,$groups,$Symbs,$enrollment,$courseid,$starttime,$endtime) = @_;
2145: $courseid = $env{'request.course.id'} if (! defined($courseid));
2146: &setup_table_names($courseid);
2147: my $dbh = &Apache::lonmysql::get_dbh();
2148: return (undef) if (! defined($dbh));
2149: my $tmptable = &temp_table_name($courseid,'temp_'.time);
2150: my $request = 'DROP TABLE IF EXISTS '.$tmptable;
2151: # &Apache::lonnet::logthis('request = '.$/.$request);
2152: $dbh->do($request);
2153: #
2154: my $symb_requirements;
2155: if (defined($Symbs) && @$Symbs) {
2156: $symb_requirements = '('.
2157: join(' OR ', map{ "(a.symb_id='".&get_symb_id($_->{'symb'}).
2158: "' AND a.part_id='".&get_part_id($_->{'part'}).
2159: "')"
2160: } @$Symbs).')';
2161: }
2162: #
2163: my ($student_requirements,$enrollment_requirements) =
2164: &limit_by_section_and_status($sections,$enrollment,'b');
2165: #
2166: my ($groups_join,$group_limits) = &limit_by_group($groups,'b','d','e');
2167: my $time_requirements = &limit_by_start_end_time($starttime,$endtime,'a');
2168: ##
2169: $request = 'CREATE TEMPORARY TABLE IF NOT EXISTS '.$tmptable.
2170: ' SELECT a.student_id,SUM(a.awarded*c.weight) AS score FROM '.
2171: $performance_table.' AS a ';
2172: $request .= "LEFT JOIN ".$weight_table.' AS c ON a.symb_id=c.symb_id AND a.part_id=c.part_id ';
2173: if (defined($student_requirements) || defined($enrollment_requirements)) {
2174: $request .= ' LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id ';
2175: }
2176: if (defined($groups_join)) {
2177: $request .= $groups_join;
2178: }
2179: if (defined($symb_requirements) ||
2180: defined($student_requirements) ||
2181: defined($enrollment_requirements) ||
2182: defined($group_limits) ) {
2183: $request .= ' WHERE ';
2184: }
2185: if (defined($symb_requirements)) {
2186: $request .= $symb_requirements.' AND ';
2187: }
2188: if (defined($student_requirements)) {
2189: $request .= $student_requirements.' AND ';
2190: }
2191: if (defined($enrollment_requirements)) {
2192: $request .= $enrollment_requirements.' AND ';
2193: }
2194: if (defined($time_requirements)) {
2195: $request .= $time_requirements.' AND ';
2196: }
2197: $request =~ s/ AND $//; # Strip of the trailing ' AND '.
2198: $request .= ' GROUP BY a.student_id';
2199: # &Apache::lonnet::logthis("request = \n".$request);
2200: my $sth = $dbh->prepare($request);
2201: $sth->execute();
2202: if ($dbh->err) {
2203: &Apache::lonnet::logthis('error 6 = '.$dbh->errstr());
2204: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2205: return undef;
2206: }
2207: $request = 'SELECT score,COUNT(*) FROM '.$tmptable.' GROUP BY score';
2208: # &Apache::lonnet::logthis("request = \n".$request);
2209: $sth = $dbh->prepare($request);
2210: $sth->execute();
2211: if ($dbh->err) {
2212: &Apache::lonnet::logthis('error 7 = '.$dbh->errstr());
2213: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2214: return undef;
2215: }
2216: my $dataset = $sth->fetchall_arrayref();
2217: return $dataset;
2218: }
2219:
2220:
2221:
2222: sub setup_table_names {
2223: my ($courseid) = @_;
2224: if (! defined($courseid)) {
2225: $courseid = $env{'request.course.id'};
2226: }
2227: #
2228: if (! defined($current_course) || $current_course ne $courseid) {
2229: # Clear out variables
2230: $have_read_part_table = 0;
2231: undef(%ids_by_part);
2232: undef(%parts_by_id);
2233: $have_read_symb_table = 0;
2234: undef(%ids_by_symb);
2235: undef(%symbs_by_id);
2236: $have_read_student_table = 0;
2237: undef(%ids_by_student);
2238: undef(%students_by_id);
2239: $have_read_groupnames_table = 0;
2240: undef(%ids_by_groupname);
2241: #
2242: $current_course = $courseid;
2243: }
2244: #
2245: # Set up database names
2246: my $base_id = 'md5_'.&Digest::MD5::md5_hex($courseid);
2247: $symb_table = $base_id.'_'.'symb';
2248: $part_table = $base_id.'_'.'part';
2249: $student_table = $base_id.'_'.'student';
2250: $groupnames_table = $base_id.'_'.'groupnames';
2251: $students_groups_table = $base_id.'_'.'studentgroups';
2252: $performance_table = $base_id.'_'.'performance';
2253: $parameters_table = $base_id.'_'.'parameters';
2254: $fulldump_part_table = $base_id.'_'.'partdata';
2255: $fulldump_response_table = $base_id.'_'.'responsedata';
2256: $fulldump_timestamp_table = $base_id.'_'.'timestampdata';
2257: $weight_table = $base_id.'_'.'weight';
2258: #
2259: @Tables = (
2260: $symb_table,
2261: $part_table,
2262: $student_table,
2263: $groupnames_table,
2264: $students_groups_table,
2265: $performance_table,
2266: $parameters_table,
2267: $fulldump_part_table,
2268: $fulldump_response_table,
2269: $fulldump_timestamp_table,
2270: $weight_table,
2271: );
2272: return;
2273: }
2274:
2275: sub temp_table_name {
2276: my ($courseid,$affix) = @_;
2277: my $base_id = 'md5_'.&Digest::MD5::md5_hex($courseid);
2278: return $base_id.'_'.$affix;
2279: }
2280:
2281:
2282: } # End scope of table identifiers
2283:
2284:
2285:
2286: sub CL_SDOM { return 0; }
2287: sub CL_SNAME { return 1; }
2288: sub CL_END { return 2; }
2289: sub CL_START { return 3; }
2290: sub CL_ID { return 4; }
2291: sub CL_SECTION { return 5; }
2292: sub CL_FULLNAME { return 6; }
2293: sub CL_STATUS { return 7; }
2294: sub CL_TYPE { return 8; }
2295: sub CL_LOCKEDTYPE { return 9; }
2296: sub CL_GROUP { return 10; }
2297: sub CL_PERMANENTEMAIL { return 11; }
2298: sub CL_ROLE { return 12; }
2299: sub CL_EXTENT { return 13; }
2300: sub CL_PHOTO { return 14; }
2301: sub CL_THUMBNAIL { return 15; }
2302:
2303: sub get_classlist {
2304: my ($cdom,$cnum) = @_;
2305: my $cid = $cdom.'_'.$cnum;
2306: if (!defined($cdom) || !defined($cnum)) {
2307: $cid = $env{'request.course.id'};
2308: $cdom = $env{'course.'.$cid.'.domain'};
2309: $cnum = $env{'course.'.$cid.'.num'};
2310: }
2311: my $now = time;
2312: #
2313: my %classlist=&Apache::lonnet::dump('classlist',$cdom,$cnum);
2314: while (my ($student,$info) = each(%classlist)) {
2315: if ($student =~ /^(con_lost|error|no_such_host)/i) {
2316: &Apache::lonnet::logthis('get_classlist error for '.$cid.':'.$student);
2317: return undef;
2318: }
2319: my ($sname,$sdom) = split(/:/,$student);
2320: my @Values = split(/:/,$info);
2321: my ($end,$start,$id,$section,$fullname,$type,$lockedtype);
2322: if (@Values > 2) {
2323: ($end,$start,$id,$section,$fullname,$type,$lockedtype) = @Values;
2324: } else { # We have to get the data ourselves
2325: ($end,$start) = @Values;
2326: $section = &Apache::lonnet::getsection($sdom,$sname,$cid);
2327: my %info=&Apache::lonnet::get('environment',
2328: ['firstname','middlename',
2329: 'lastname','generation','id'],
2330: $sdom, $sname);
2331: my ($tmp) = keys(%info);
2332: if ($tmp =~/^(con_lost|error|no_such_host)/i) {
2333: $fullname = 'not available';
2334: $id = 'not available';
2335: &Apache::lonnet::logthis('unable to retrieve environment '.
2336: 'for '.$sname.':'.$sdom);
2337: } else {
2338: $fullname = &Apache::lonnet::format_name(@info{qw/firstname middlename lastname generation/},'lastname');
2339: $id = $info{'id'};
2340: }
2341: # Update the classlist with this students information
2342: if ($fullname ne 'not available') {
2343: my $enrolldata = join(':',$end,$start,$id,$section,$fullname);
2344: my $reply=&Apache::lonnet::cput('classlist',
2345: {$student => $enrolldata},
2346: $cdom,$cnum);
2347: if ($reply !~ /^(ok|delayed)/) {
2348: &Apache::lonnet::logthis('Unable to update classlist for '.
2349: 'student '.$sname.':'.$sdom.
2350: ' error:'.$reply);
2351: }
2352: }
2353: }
2354: my $status='Expired';
2355: if(((!$end) || $now < $end) && ((!$start) || ($now > $start))) {
2356: $status='Active';
2357: }
2358: if(($now < $start) && ((!$end) || $now < $end )) {
2359: $status='Future';
2360: }
2361: $classlist{$student} =
2362: [$sdom,$sname,$end,$start,$id,$section,$fullname,$status,$type,$lockedtype];
2363: }
2364: if (wantarray()) {
2365: return (\%classlist,['domain','username','end','start','id',
2366: 'section','fullname','status','type','lockedtype']);
2367: } else {
2368: return \%classlist;
2369: }
2370: }
2371:
2372: sub get_group_memberships {
2373: my ($classlist,$keylist,$cdom,$cnum) = @_;
2374:
2375: return ({},{}) if (!ref($classlist) || !ref($keylist));
2376:
2377: my $cid = $cdom.'_'.$cnum;
2378: if (!defined($cdom) || !defined($cnum)) {
2379: $cid = $env{'request.course.id'};
2380: $cdom = $env{'course.'.$cid.'.domain'};
2381: $cnum = $env{'course.'.$cid.'.num'};
2382: }
2383: my (%classgroups,%studentgroups);
2384: my $now = time;
2385: my $access_end = $env{'course.'.$cid.'.default_enrollment_end_date'};
2386: my %curr_groups =&Apache::longroup::coursegroups($cdom,$cnum);
2387: if (%curr_groups) {
2388: my $grpindex = &CL_GROUP();
2389: my %groupmemberhash =
2390: &Apache::lonnet::get_group_membership($cdom,$cnum);
2391: foreach my $student (keys(%{$classlist})) {
2392: %{$classgroups{$student}} = ();
2393: my $hasgroup = 0;
2394: foreach my $status ('previous','future','active','aftercourse') {
2395: %{$classgroups{$student}{$status}} = ();
2396: }
2397: foreach my $group (keys(%curr_groups)) {
2398: if (defined($groupmemberhash{$group.':'.$student})) {
2399: my ($end,$start) = split(/:/,$groupmemberhash{$group.':'.
2400: $student});
2401: if ($start == -1) {
2402: next;
2403: } else {
2404: $studentgroups{$group} ++;
2405: $hasgroup = 1;
2406: if ($end && $end < $now) {
2407: $classgroups{$student}{'previous'}{$group} =
2408: $groupmemberhash{$group.':'.$student};
2409: if ($classlist->{$student}[&CL_STATUS()] eq 'Expired') {
2410: if ($access_end && $access_end < $now) {
2411: if ($access_end - $end < 86400) {
2412: $classgroups{$student}{'aftercourse'}{$group} = $groupmemberhash{$group.':'.$student};
2413: }
2414: }
2415: }
2416: } elsif ($now > $start) {
2417: if (!$end || $end > $now) {
2418: $classgroups{$student}{'active'}{$group} =
2419: $groupmemberhash{$group.':'.$student};
2420: }
2421: } else {
2422: $classgroups{$student}{'future'}{$group} =
2423: $groupmemberhash{$group.':'.$student};
2424: }
2425: }
2426: }
2427: }
2428: if (!$hasgroup) {
2429: $studentgroups{'none'} ++;
2430: } else {
2431: $classlist->{$student}->[$grpindex] = join(',',
2432: sort(keys(%{$classgroups{$student}{'active'}})));
2433: }
2434: }
2435: }
2436: return (\%classgroups,\%studentgroups);
2437: }
2438:
2439: sub get_students_groups {
2440: my ($student,$enrollment_status,$classgroups) = @_;
2441: my @studentsgroups = ();
2442: if (ref($$classgroups{$student}{'active'}) eq 'HASH') {
2443: push(@studentsgroups,keys(%{$$classgroups{$student}{'active'}}));
2444: }
2445: if ($enrollment_status eq 'Any') {
2446: foreach my $status ('previous','future') {
2447: if (ref($$classgroups{$student}{$status}) eq 'HASH') {
2448: push(@studentsgroups,keys(%{$$classgroups{$student}{$status}}));
2449: }
2450: }
2451: } else {
2452: if (ref($$classgroups{$student}{'aftercourse'}) eq 'HASH') {
2453: push(@studentsgroups,keys(%{$$classgroups{$student}{'aftercourse'}}));
2454: }
2455: }
2456: return @studentsgroups;
2457: }
2458:
2459:
2460: # ----- END HELPER FUNCTIONS --------------------------------------------
2461:
2462: 1;
2463: __END__
2464:
2465:
2466: =pod
2467:
2468: =head1 NAME
2469:
2470: Apache::loncoursedata
2471:
2472: =head1 SYNOPSIS
2473:
2474: Set of functions that download and process student and course information.
2475:
2476: =head1 PACKAGES USED
2477:
2478: Apache::lonnet
2479: Apache::longroup
2480: Time::HiRes
2481: Apache::lonmysql
2482: LONCAPA
2483: Digest::MD5
2484:
2485: =head1 DOWNLOAD INFORMATION
2486:
2487: This section contains all the functions that get data from other servers
2488: and/or itself.
2489:
2490:
2491:
2492: =head1 LOCAL DATA CACHING SUBROUTINES
2493:
2494: The local caching is done using MySQL. There is no fall-back implementation
2495: if MySQL is not running.
2496:
2497: The programmers interface is to call &get_current_state() or some other
2498: primary interface subroutine (described below). The internals of this
2499: storage system are documented here.
2500:
2501: There are six tables used to store student performance data (the results of
2502: a dumpcurrent). Each of these tables is created in MySQL with a name of
2503: $courseid_*****, where ***** is 'symb', 'part', or whatever is appropriate
2504: for the table. The tables and their purposes are described below.
2505:
2506: Some notes before we get started.
2507:
2508: Each table must have a PRIMARY KEY, which is a column or set of columns which
2509: will serve to uniquely identify a row of data. NULL is not allowed!
2510:
2511: INDEXes work best on integer data.
2512:
2513: JOIN is used to combine data from many tables into one output.
2514:
2515: lonmysql.pm is used for some of the interface, specifically the table creation
2516: calls. The inserts are done in bulk by directly calling the database handler.
2517: The SELECT ... JOIN statement used to retrieve the data does not have an
2518: interface in lonmysql.pm and I shudder at the thought of writing one.
2519:
2520: =head2 Table Descriptions
2521:
2522: =over 4
2523:
2524: =head2 Tables used to store meta information
2525:
2526: The following tables hold data required to keep track of the current status
2527: of a students data in the tables or to look up the students data in the tables.
2528:
2529: =over 4
2530:
2531: =item C<$symb_table>
2532:
2533: The symb_table has two columns. The first is a 'symb_id' and the second
2534: is the text name for the 'symb' (limited to 64k). The 'symb_id' is generated
2535: automatically by MySQL so inserts should be done on this table with an
2536: empty first element. This table has its PRIMARY KEY on the 'symb_id'.
2537:
2538: =item C<$part_table>
2539:
2540: The part_table has two columns. The first is a 'part_id' and the second
2541: is the text name for the 'part' (limited to 100 characters). The 'part_id' is
2542: generated automatically by MySQL so inserts should be done on this table with
2543: an empty first element. This table has its PRIMARY KEY on the 'part' (100
2544: characters) and a KEY on 'part_id'.
2545:
2546: =item C<$student_table>
2547:
2548: The student_table has 7 columns. The first is a 'student_id' assigned by
2549: MySQL. The second is 'student' which is username:domain. The third through
2550: fifth are 'section', 'status' (enrollment status), and 'classification'
2551: (to be used in the future). The sixth and seventh ('updatetime' and
2552: 'fullupdatetime') contain the time of last update and full update of student
2553: data. This table has its PRIMARY KEY on the 'student_id' column and is indexed
2554: on 'student', 'section', and 'status'.
2555:
2556: =item C<$groupnames_table>
2557:
2558: The groupnames_table has 2 columns. The first is a 'group_id' assigned by
2559: MySQL. The second is 'groupname' which is the name of the group in the course.
2560:
2561: =item C<$students_groups_table>
2562:
2563: The students_groups_table has 2 columns. The first is the 'student_id', and the
2564: second is the 'group_id'. These two columns comprise the PRIMARY KEY for this
2565: table, as an individual student may be affiliated with more than one group at
2566: any time. This table is indexed on both student_id and group_id.
2567:
2568: =back
2569:
2570: =head2 Tables used to store current status data
2571:
2572: The following tables store data only about the students current status on
2573: a problem, meaning only the data related to the last attempt on a problem.
2574:
2575: =over 4
2576:
2577: =item C<$performance_table>
2578:
2579: The performance_table has 9 columns. The first three are 'symb_id',
2580: 'student_id', and 'part_id'. These comprise the PRIMARY KEY for this table
2581: and are directly related to the $symb_table, $student_table, and $part_table
2582: described above. MySQL does better indexing on numeric items than text,
2583: so we use these three "index tables". The remaining columns are
2584: 'solved', 'tries', 'awarded', 'award', 'awarddetail', and 'timestamp'.
2585: These are either the MySQL type TINYTEXT or various integers ('tries' and
2586: 'timestamp'). This table has KEYs of 'student_id' and 'symb_id'.
2587: For use of this table, see the functions described below.
2588:
2589: =item C<$parameters_table>
2590:
2591: The parameters_table holds the data that does not fit neatly into the
2592: performance_table. The parameters table has four columns: 'symb_id',
2593: 'student_id', 'parameter', and 'value'. 'symb_id', 'student_id', and
2594: 'parameter' comprise the PRIMARY KEY for this table. 'parameter' is
2595: limited to 255 characters. 'value' is limited to 64k characters.
2596:
2597: =back
2598:
2599: =head2 Tables used for storing historic data
2600:
2601: The following tables are used to store almost all of the transactions a student
2602: has made on a homework problem. See loncapa/docs/homework/datastorage for
2603: specific information about each of the parameters stored.
2604:
2605: =over 4
2606:
2607: =item C<$fulldump_response_table>
2608:
2609: The response table holds data (documented in loncapa/docs/homework/datastorage)
2610: associated with a particular response id which is stored when a student
2611: attempts a problem. The following are the columns of the table, in order:
2612: 'symb_id','part_id','response_id','student_id','transaction','tries',
2613: 'awarddetail', 'response_specific', 'response_specific_value',
2614: 'response_specific_2', 'response_specific_value_2', and 'submission
2615: (the text of the students submission). The primary key is based on the
2616: first five columns listed above.
2617:
2618: =item C<$fulldump_part_table()>
2619:
2620: The part table holds data (documented in loncapa/docs/homework/datastorage)
2621: associated with a particular part id which is stored when a student attempts
2622: a problem. The following are the columns of the table, in order:
2623: 'symb_id','part_id','student_id','transaction','tries','award','awarded',
2624: and 'previous'. The primary key is based on the first five columns listed
2625: above.
2626:
2627: =item C<$fulldump_timestamp_table()>
2628:
2629: The timestamp table holds the timestamps of the transactions which are
2630: stored in $fulldump_response_table and $fulldump_part_table. This data is
2631: about both the response and part data. Columns: 'symb_id','student_id',
2632: 'transaction', and 'timestamp'.
2633: The primary key is based on the first 3 columns.
2634:
2635: =item C<$weight_table()>
2636:
2637: The weight table holds the weight for the problems used in the class.
2638: Whereas the weight of a problem can vary by section and student the data
2639: here is applied to the class as a whole.
2640: Columns: 'symb_id','part_id','response_id','weight'.
2641:
2642: =back
2643:
2644:
2645: =head1 IMPORTANT SUBROUTINES
2646:
2647: Here is a brief overview of the subroutines which are likely to be of
2648: interest:
2649:
2650: =over 4
2651:
2652: =item C<&get_current_state()>
2653:
2654: programmers interface.
2655:
2656: =item C<&init_dbs()>
2657:
2658: table creation
2659:
2660: =item C<&update_student_data()>
2661:
2662: data storage calls
2663:
2664: =item C<&get_student_data_from_performance_cache()>
2665:
2666: data retrieval
2667:
2668: =back
2669:
2670: =head1 OTHER SUBROUTINES
2671:
2672: =over 4
2673:
2674: =item C<&make_into_hash($values)>
2675:
2676: Returns a reference to a hash as described by $values. $values is
2677: assumed to be the result of
2678: join(':',map {&escape($_)} %orighash);
2679:
2680: This is a helper function for get_current_state.
2681:
2682: =item C<&init_dbs()>
2683:
2684: Input: course id
2685:
2686: Output: 0 on success, positive integer on error
2687:
2688: This routine issues the calls to lonmysql to create the tables used to
2689: store student data.
2690:
2691: item C<&delete_caches()>
2692:
2693: This routine drops all the tables associated with a course from the
2694: MySQL database.
2695:
2696: Input: course id (optional, determined by environment if omitted)
2697:
2698: Returns: nothing
2699:
2700: =item C<&get_part_id()>
2701:
2702: Get the MySQL id of a problem part string.
2703:
2704: Input: $part
2705:
2706: Output: undef on error, integer $part_id on success.
2707:
2708: =item C<&get_part()>
2709:
2710: Get the string describing a part from the MySQL id of the problem part.
2711:
2712: Input: $part_id
2713:
2714: Output: undef on error, $part string on success.
2715:
2716: =item C<&get_symb_id()>
2717:
2718: Get the MySQL id of a symb.
2719:
2720: Input: $symb
2721:
2722: Output: undef on error, integer $symb_id on success.
2723:
2724: =item C<&get_symb()>
2725:
2726: Get the symb associated with a MySQL symb_id.
2727:
2728: Input: $symb_id
2729:
2730: Output: undef on error, $symb on success.
2731:
2732: =item C<&get_student_id()>
2733:
2734: Get the MySQL id of a student.
2735:
2736: Input: $sname, $dom
2737:
2738: Output: undef on error, integer $student_id on success.
2739:
2740: =item C<&get_student()>
2741:
2742: Get student username:domain associated with the MySQL student_id.
2743:
2744: Input: $student_id
2745:
2746: Output: undef on error, string $student (username:domain) on success.
2747:
2748: =item C<&clear_internal_caches()>
2749:
2750: Causes the internal caches used in get_student_id, get_student,
2751: get_symb_id, get_symb, get_part_id, and get_part to be undef'd.
2752:
2753: Needs to be called before the first operation with the MySQL database
2754: for a given Apache request.
2755:
2756: =item C<&update_full_student_data($sname,$sdom,$courseid)>
2757:
2758: Does a lonnet::dump on a student to populate the courses tables.
2759:
2760: Input: $sname, $sdom, $courseid
2761:
2762: Output: $returnstatus
2763:
2764: $returnstatus is a string describing any errors that occurred. 'okay' is the
2765: default.
2766:
2767: This subroutine loads a students data using lonnet::dump and inserts
2768: it into the MySQL database. The inserts are done on three tables,
2769: $fulldump_response_table, $fulldump_part_table, and $fulldump_timestamp_table.
2770: The INSERT calls are made directly by this subroutine, not through lonmysql
2771: because we do a 'bulk'insert which takes advantage of MySQLs non-SQL
2772: compliant INSERT command to insert multiple rows at a time.
2773: If anything has gone wrong during this process, $returnstatus is updated with
2774: a description of the error.
2775:
2776: Once the "fulldump" tables are updated, the tables used for chart and
2777: spreadsheet (which hold only the current state of the student on their
2778: homework, not historical data) are updated. If all updates have occurred
2779: successfully, $student_table is updated to reflect the time of the update.
2780:
2781: Notice we do not insert the data and immediately query it. This means it
2782: is possible for there to be data returned this first time that is not
2783: available the second time. CYA.
2784:
2785:
2786: =item C<&update_student_data()>
2787:
2788: Input: $sname, $sdom, $courseid
2789:
2790: Output: $returnstatus, \%student_data
2791:
2792: $returnstatus is a string describing any errors that occurred. 'okay' is the
2793: default.
2794: \%student_data is the data returned by a call to lonnet::currentdump.
2795:
2796: This subroutine loads a students data using lonnet::currentdump and inserts
2797: it into the MySQL database. The inserts are done on two tables,
2798: $performance_table and $parameters_table. $parameters_table holds the data
2799: that is not included in $performance_table. See the description of
2800: $performance_table elsewhere in this file. The INSERT calls are made
2801: directly by this subroutine, not through lonmysql because we do a 'bulk'
2802: insert which takes advantage of MySQLs non-SQL compliant INSERT command to
2803: insert multiple rows at a time. If anything has gone wrong during this
2804: process, $returnstatus is updated with a description of the error and
2805: \%student_data is returned.
2806:
2807: Notice we do not insert the data and immediately query it. This means it
2808: is possible for there to be data returned this first time that is not
2809: available the second time. CYA.
2810:
2811: =item &ensure_tables_are_set_up($courseid)
2812:
2813: Checks to be sure the MySQL tables for the given class are set up.
2814: If $courseid is omitted it will be obtained from the environment.
2815:
2816: Returns nothing on success and 'error' on failure
2817:
2818:
2819: =item C<&ensure_current_data()>
2820:
2821: Input: $sname, $sdom, $courseid
2822:
2823: Output: $status, $data
2824:
2825: This routine ensures the data for a given student is up to date.
2826: The $student_table is queried to determine the time of the last update.
2827: If the students data is out of date, &update_student_data() is called.
2828: The return values from the call to &update_student_data() are returned.
2829:
2830: =item C<&ensure_current_full_data($sname,$sdom,$courseid)>
2831:
2832: Input: $sname, $sdom, $courseid
2833:
2834: Output: $status
2835:
2836: This routine ensures the fulldata (the data from a lonnet::dump, not a
2837: lonnet::currentdump) for a given student is up to date.
2838: The $student_table is queried to determine the time of the last update.
2839: If the students fulldata is out of date, &update_full_student_data() is
2840: called.
2841:
2842: The return value from the call to &update_full_student_data() is returned.
2843:
2844: =item C<&get_student_data_from_performance_cache()>
2845:
2846: Input: $sname, $sdom, $symb, $courseid
2847:
2848: Output: hash reference containing the data for the given student.
2849: If $symb is undef, all the students data is returned.
2850:
2851: This routine is the heart of the local caching system. See the description
2852: of $performance_table, $symb_table, $student_table, and $part_table. The
2853: main task is building the MySQL request. The tables appear in the request
2854: in the order in which they should be parsed by MySQL. When searching
2855: on a student the $student_table is used to locate the 'student_id'. All
2856: rows in $performance_table which have a matching 'student_id' are returned,
2857: with data from $part_table and $symb_table which match the entries in
2858: $performance_table, 'part_id' and 'symb_id'. When searching on a symb,
2859: the $symb_table is processed first, with matching rows grabbed from
2860: $performance_table and filled in from $part_table and $student_table in
2861: that order.
2862:
2863: Running 'EXPLAIN ' on the 'SELECT' statements generated can be quite
2864: interesting, especially if you play with the order the tables are listed.
2865:
2866:
2867: =item C<&get_current_state()>
2868:
2869: Input: $sname,$sdom,$symb,$courseid
2870:
2871: Output: Described below
2872:
2873: Retrieve the current status of a students performance. $sname and
2874: $sdom are the only required parameters. If $symb is undef the results
2875: of an &Apache::lonnet::currentdump() will be returned.
2876: If $courseid is undef it will be retrieved from the environment.
2877:
2878: The return structure is based on &Apache::lonnet::currentdump. If
2879: $symb is unspecified, all the students data is returned in a hash of
2880: the form:
2881: (
2882: symb1 => { param1 => value1, param2 => value2 ... },
2883: symb2 => { param1 => value1, param2 => value2 ... },
2884: )
2885:
2886: If $symb is specified, a hash of
2887: (
2888: param1 => value1,
2889: param2 => value2,
2890: )
2891: is returned.
2892:
2893: If no data is found for $symb, or if the student has no performance data,
2894: an empty list is returned.
2895:
2896: =item C<&get_problem_statistics()>
2897:
2898: Gather data on a given problem. The database is assumed to be
2899: populated and all local caching variables are assumed to be set
2900: properly. This means you need to call &ensure_current_data for
2901: the students you are concerned with prior to calling this routine.
2902:
2903: Inputs: $Sections, Groups, $status, $symb, $part, $courseid, $starttime,
2904: $endtime
2905:
2906: =over 4
2907:
2908: =item $Sections Array ref containing section names for students.
2909: 'all' is allowed to be the first (and only) item in the array.
2910:
2911: =item $Groups Array ref containing group names for students.
2912: 'all' is allowed to be the first (and only) item in the array.
2913:
2914: =item $status String describing the status of students
2915:
2916: =item $symb is the symb for the problem.
2917:
2918: =item $part is the part id you need statistics for
2919:
2920: =item $courseid is the course id, of course!
2921:
2922: =item $starttime and $endtime are unix times which to use to limit
2923: the statistical data.
2924:
2925: =back
2926:
2927: Outputs: See the code for up to date information. A hash reference is
2928: returned. The hash has the following keys defined:
2929:
2930: =over 4
2931:
2932: =item * num_students
2933:
2934: The number of students attempting the problem
2935:
2936: =item tries
2937:
2938: The total number of tries for the students
2939:
2940: =item max_tries
2941:
2942: The maximum number of tries taken
2943:
2944: =item mean_tries
2945:
2946: The average number of tries
2947:
2948: =item num_solved T
2949:
2950: he number of students able to solve the problem
2951:
2952: =item num_override
2953:
2954: The number of students whose answer is 'correct_by_override'
2955:
2956: =item deg_of_diff
2957:
2958: The degree of difficulty of the problem
2959:
2960: =item std_tries
2961:
2962: The standard deviation of the number of tries
2963:
2964: =item skew_tries
2965:
2966: The skew of the number of tries
2967:
2968: =item per_wrong
2969:
2970: The number of students attempting the problem who were not
2971: able to answer it correctly.
2972:
2973: =back
2974:
2975: =item C<&populate_weight_table()>
2976:
2977: =item C<&limit_by_start_end_times()>
2978:
2979: Build SQL WHERE condition which limits the data collected by the start
2980: and end times provided
2981:
2982: Inputs: $starttime, $endtime, $table
2983:
2984: Returns: $time_limits
2985:
2986:
2987: =item C<&limit_by_section_and_status()C<
2988:
2989: Build SQL WHERE condition which limits the data collected by section and
2990: student status.
2991:
2992: Inputs: $Sections (array ref)
2993: $enrollment (string: 'any', 'expired', 'active')
2994: $tablename The name of the table that holds the student data
2995:
2996: Returns: $student_requirements,$enrollment_requirements
2997:
2998: =item C<&limit_by_group()>
2999:
3000: Build SQL LEFT JOIN statement to include students_groups and groupnames tables and SQL WHERE condition which limits the data collected by group.
3001:
3002: Inputs: $Groups (array ref)
3003: $stutable The name of the table which holds the student data.
3004: $grptable The name of the table which maps group_id to groupname.
3005: $stugrptab The name of the table which holds student group affiliations.
3006: Returns: $groups_join,$group_limits
3007: $groups_join JOIN part of SQL statement (to include group related tables)
3008: $group_limits SQL WHERE condition limiting to requested groups
3009:
3010: =item C<rank_students_by_scores_on_resources()>
3011:
3012: Inputs:
3013: $resources: array ref of hash ref. Each hash ref needs key 'symb'.
3014: $Sections: array ref of sections to include,
3015: $Groups: array ref of groups to include.
3016: $enrollment: string,
3017: $courseid (may be omitted)
3018: $starttime (may be omitted)
3019: $endtime (may be omitted)
3020: $has_award_for (may be omitted)
3021:
3022: Returns; An array of arrays. The sub arrays contain a student name and
3023: their score on the resources. $starttime and $endtime constrain the
3024: list to awards obtained during the given time limits. $has_score_on
3025: constrains the list to those students who at least attempted the
3026: resource identified by the given symb, which is used to filter out
3027: such students for statistics that would be adversely affected by such
3028: students.
3029:
3030: =item C<&get_sum_of_scores>
3031:
3032: Inputs: $resource (hash ref, needs {'symb'} key),
3033: $part, (the part id),
3034: $students (array ref, contents of array are scalars holding 'sname:sdom'),
3035: $courseid
3036:
3037: Returns: the sum of the score on the problem part over the students and the
3038: maximum possible value for the sum (taken from the weight table).
3039:
3040:
3041: =item C<&score_stats()>
3042:
3043: Inputs: $Sections, $enrollment, $symbs, $starttime,
3044: $endtime, $courseid
3045:
3046: $Sections, $enrollment, $starttime, $endtime, and $courseid are the same as
3047: elsewhere in this module.
3048: $symbs is an array ref of symbs
3049:
3050: Returns: minimum, maximum, mean, s.d., number of students, and maximum
3051: possible of student scores on the given resources
3052:
3053: =item C<&count_stats()>
3054:
3055: Inputs: $Sections, $Groups, $enrollment, $symbs, $starttime,
3056: $endtime, $courseid
3057:
3058: $Sections, $Groups $enrollment, $starttime, $endtime, and $courseid are the
3059: same as elsewhere in this module.
3060: $symbs is an array ref of symbs
3061:
3062: Returns: minimum, maximum, mean, s.d., and number of students
3063: of the number of items correct on the given resources
3064:
3065: =item C<get_student_data()>
3066:
3067: =item C<&get_student_scores($Sections,$Groups,$Symbs,$enrollment,$courseid)>
3068:
3069: =item C<&setup_table_names()>
3070:
3071: input: course id
3072:
3073: output: none
3074:
3075: =back
3076:
3077: =head3 End of Local Data Caching Subroutines
3078:
3079: =head3 Classlist Subroutines
3080:
3081: =over
3082:
3083: =item &get_classlist();
3084:
3085: Retrieve the classist of a given class or of the current class. Student
3086: information is returned from the classlist.db file and, if needed,
3087: from the students environment.
3088:
3089: Optional arguments are $cdom, and $cnum (course domain,
3090: and course number, respectively). If either is ommitted the course
3091: will be taken from the current environment ($env{'request.course.id'},
3092: $env{'course.'.$cid.'.domain'}, and $env{'course.'.$cid.'.num'}).
3093:
3094: Returns a reference to a hash which contains:
3095: keys '$sname:$sdom'
3096: values [$sdom,$sname,$end,$start,$id,$section,$fullname,$status,$type,$lockedtype]
3097:
3098: The constant values CL_SDOM, CL_SNAME, CL_END, etc. can be used
3099: as indices into the returned list to future-proof clients against
3100: changes in the list order.
3101:
3102: =back
3103:
3104: =cut
3105:
3106:
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