1: # The LearningOnline Network with CAPA
2: #
3: # $Id: loncoursedata.pm,v 1.193 2011/10/03 13:27:17 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,$sdom);
1254: my @Result = &Apache::lonmysql::get_rows($student_table,
1255: "student_id ='$student_id'");
1256: my $data = undef;
1257: if (@Result) {
1258: $updatetime = $Result[0]->[6]; # Ack! This is dumb!
1259: }
1260: if ($modifiedtime > $updatetime) {
1261: ($status,$data) = &update_student_data($sname,$sdom,$courseid);
1262: }
1263: return ($status,$data);
1264: }
1265:
1266:
1267: sub ensure_current_full_data {
1268: my ($sname,$sdom,$courseid) = @_;
1269: my $status = 'okay'; # return value
1270: #
1271: $courseid = $env{'request.course.id'} if (! defined($courseid));
1272: &ensure_tables_are_set_up($courseid);
1273: #
1274: # Get the update time for the user
1275: my $getuserdir = 1;
1276: my $modifiedtime = &Apache::lonnet::GetFileTimestamp
1277: ($sdom,$sname,$courseid.'.db',$getuserdir);
1278: #
1279: my $student_id = &get_student_id($sname,$sdom);
1280: my @Result = &Apache::lonmysql::get_rows($student_table,
1281: "student_id ='$student_id'");
1282: my $updatetime;
1283: if (@Result && ref($Result[0]) eq 'ARRAY') {
1284: $updatetime = $Result[0]->[7];
1285: }
1286: if (! defined($updatetime) || $modifiedtime > $updatetime) {
1287: $status = &update_full_student_data($sname,$sdom,$courseid);
1288: }
1289: return $status;
1290: }
1291:
1292:
1293: sub get_student_data_from_performance_cache {
1294: my ($sname,$sdom,$symb,$courseid)=@_;
1295: my $student = $sname.':'.$sdom if (defined($sname) && defined($sdom));
1296: &setup_table_names($courseid);
1297: #
1298: # Return hash
1299: my $studentdata;
1300: #
1301: my $dbh = &Apache::lonmysql::get_dbh();
1302: my $request = "SELECT ".
1303: "d.symb,a.part,a.solved,a.tries,a.awarded,a.award,a.awarddetail,".
1304: "a.timestamp ";
1305: if (defined($student)) {
1306: $request .= "FROM $student_table AS b ".
1307: "LEFT JOIN $performance_table AS a ON b.student_id=a.student_id ".
1308: # "LEFT JOIN $part_table AS c ON c.part_id = a.part_id ".
1309: "LEFT JOIN $symb_table AS d ON d.symb_id = a.symb_id ".
1310: "WHERE student='$student'";
1311: if (defined($symb) && $symb ne '') {
1312: $request .= " AND d.symb=".$dbh->quote($symb);
1313: }
1314: } elsif (defined($symb) && $symb ne '') {
1315: $request .= "FROM $symb_table as d ".
1316: "LEFT JOIN $performance_table AS a ON d.symb_id=a.symb_id ".
1317: # "LEFT JOIN $part_table AS c ON c.part_id = a.part_id ".
1318: "LEFT JOIN $student_table AS b ON b.student_id = a.student_id ".
1319: "WHERE symb='".$dbh->quote($symb)."'";
1320: }
1321: my $starttime = Time::HiRes::time;
1322: my $rows_retrieved = 0;
1323: my $sth = $dbh->prepare($request);
1324: $sth->execute();
1325: if ($sth->err()) {
1326: &Apache::lonnet::logthis("Unable to execute MySQL request:");
1327: &Apache::lonnet::logthis("\n".$request."\n");
1328: &Apache::lonnet::logthis("error is:".$sth->errstr());
1329: return undef;
1330: }
1331: foreach my $row (@{$sth->fetchall_arrayref}) {
1332: $rows_retrieved++;
1333: my ($symb,$part,$solved,$tries,$awarded,$award,$awarddetail,$time) =
1334: (@$row);
1335: my $base = 'resource.'.$part;
1336: $studentdata->{$symb}->{$base.'.solved'} = $solved;
1337: $studentdata->{$symb}->{$base.'.tries'} = $tries;
1338: $studentdata->{$symb}->{$base.'.awarded'} = $awarded;
1339: $studentdata->{$symb}->{$base.'.award'} = $award;
1340: $studentdata->{$symb}->{$base.'.awarddetail'} = $awarddetail;
1341: $studentdata->{$symb}->{'timestamp'} = $time if (defined($time) && $time ne '');
1342: }
1343: ## Get misc parameters
1344: $request = 'SELECT c.symb,a.parameter,a.value '.
1345: "FROM $student_table AS b ".
1346: "LEFT JOIN $parameters_table AS a ON b.student_id=a.student_id ".
1347: "LEFT JOIN $symb_table AS c ON c.symb_id = a.symb_id ".
1348: "WHERE student='$student'";
1349: if (defined($symb) && $symb ne '') {
1350: $request .= " AND c.symb=".$dbh->quote($symb);
1351: }
1352: $sth = $dbh->prepare($request);
1353: $sth->execute();
1354: if ($sth->err()) {
1355: &Apache::lonnet::logthis("Unable to execute MySQL request:");
1356: &Apache::lonnet::logthis("\n".$request."\n");
1357: &Apache::lonnet::logthis("error is:".$sth->errstr());
1358: if (defined($symb) && $symb ne '') {
1359: $studentdata = $studentdata->{$symb};
1360: }
1361: return $studentdata;
1362: }
1363: #
1364: foreach my $row (@{$sth->fetchall_arrayref}) {
1365: $rows_retrieved++;
1366: my ($symb,$parameter,$value) = (@$row);
1367: $studentdata->{$symb}->{$parameter} = $value;
1368: }
1369: #
1370: if (defined($symb) && $symb ne '') {
1371: $studentdata = $studentdata->{$symb};
1372: }
1373: return $studentdata;
1374: }
1375:
1376:
1377: sub get_current_state {
1378: my ($sname,$sdom,$symb,$courseid,$forcedownload)=@_;
1379: #
1380: $courseid = $env{'request.course.id'} if (! defined($courseid));
1381: #
1382: return () if (! defined($sname) || ! defined($sdom));
1383: #
1384: my ($status,$data) = &ensure_current_data($sname,$sdom,$courseid);
1385: # &Apache::lonnet::logthis
1386: # ('sname = '.$sname.
1387: # ' domain = '.$sdom.
1388: # ' status = '.$status.
1389: # ' data is '.(defined($data)?'defined':'undefined'));
1390: # while (my ($symb,$hash) = each(%$data)) {
1391: # &Apache::lonnet::logthis($symb."\n----------------------------------");
1392: # while (my ($key,$value) = each (%$hash)) {
1393: # &Apache::lonnet::logthis(" ".$key." = ".$value);
1394: # }
1395: # }
1396: #
1397: if (defined($data) && defined($symb) && ref($data->{$symb})) {
1398: return %{$data->{$symb}};
1399: } elsif (defined($data) && ! defined($symb) && ref($data)) {
1400: return %$data;
1401: }
1402: if ($status eq 'no data') {
1403: return ();
1404: } else {
1405: if ($status ne 'okay' && $status ne '') {
1406: &Apache::lonnet::logthis('status = '.$status);
1407: return ('error: '.$status,undef);
1408: }
1409: my $returnhash = &get_student_data_from_performance_cache($sname,$sdom,
1410: $symb,$courseid);
1411: return %$returnhash if (defined($returnhash));
1412: }
1413: return ();
1414: }
1415:
1416:
1417: sub get_problem_statistics {
1418: my ($Sections,$Groups,$status,$symb,$part,$courseid,$starttime,$endtime) = @_;
1419: return if (! defined($symb) || ! defined($part));
1420: $courseid = $env{'request.course.id'} if (! defined($courseid));
1421: #
1422: &setup_table_names($courseid);
1423: my $symb_id = &get_symb_id($symb);
1424: my $part_id = &get_part_id($part);
1425: my $stats_table = &temp_table_name($courseid,'problem_stats');
1426: #
1427: my $dbh = &Apache::lonmysql::get_dbh();
1428: return undef if (! defined($dbh));
1429: #
1430: # Clean out the table
1431: $dbh->do('DROP TABLE '.$stats_table); # May return an error
1432: my $request =
1433: 'CREATE TEMPORARY TABLE '.$stats_table.' '.
1434: 'SELECT a.student_id,a.solved,a.award,a.awarded,a.tries '.
1435: 'FROM '.$performance_table.' AS a ';
1436: #
1437: # See if we need to include some requirements on the students
1438: if ((defined($Sections) && lc($Sections->[0]) ne 'all') ||
1439: (defined($status) && lc($status) ne 'any')) {
1440: $request .= 'NATURAL LEFT JOIN '.$student_table.' AS b ';
1441: }
1442: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
1443: if (defined($groups_join)) {
1444: $request .= $groups_join;
1445: }
1446: $request .= ' WHERE a.symb_id='.$symb_id.' AND a.part_id='.$part_id;
1447: #
1448: # Limit the students included to those specified
1449: my ($section_limits,$enrollment_limits)=
1450: &limit_by_section_and_status($Sections,$status,'b');
1451: #
1452: # Limit by starttime and endtime
1453: my $time_requirements = undef;
1454: if (defined($starttime)) {
1455: $time_requirements .= 'a.timestamp>='.$starttime;
1456: if (defined($endtime)) {
1457: $time_requirements .= ' AND a.timestamp<='.$endtime;
1458: }
1459: } elsif (defined($endtime)) {
1460: $time_requirements .= 'a.timestamp<='.$endtime;
1461: }
1462: if (defined($time_requirements)) {
1463: $request .= ' AND '.$time_requirements;
1464: }
1465: if (defined($section_limits)) {
1466: $request .= ' AND '.$section_limits;
1467: }
1468: if (defined($enrollment_limits)) {
1469: $request .= ' AND '.$enrollment_limits;
1470: }
1471: # Limit by group, as required
1472: if (defined($group_limits)) {
1473: $request .= ' AND '.$group_limits;
1474: }
1475: #
1476: # Finally, execute the request to create the temporary table
1477: $dbh->do($request);
1478: #
1479: # Collect the first suite of statistics
1480: $request = 'SELECT COUNT(*),SUM(tries),'.
1481: 'AVG(tries),STD(tries) '.
1482: 'FROM '.$stats_table;
1483: my ($num,$tries,$mean,$STD) = &execute_SQL_request
1484: ($dbh,$request);
1485: #
1486: $request = 'SELECT MAX(tries),MIN(tries) FROM '.$stats_table.
1487: ' WHERE awarded>0';
1488: if (defined($time_requirements)) {
1489: $request .= ' AND '.$time_requirements;
1490: }
1491: my ($max,$min) = &execute_SQL_request($dbh,$request);
1492: #
1493: $request = 'SELECT SUM(awarded) FROM '.$stats_table;
1494: if (defined($time_requirements)) {
1495: $request .= ' AND '.$time_requirements;
1496: }
1497: my ($Solved) = &execute_SQL_request($dbh,$request);
1498: #
1499: $request = 'SELECT SUM(awarded) FROM '.$stats_table.
1500: " WHERE solved='correct_by_override'";
1501: if (defined($time_requirements)) {
1502: $request .= ' AND '.$time_requirements;
1503: }
1504: my ($solved) = &execute_SQL_request($dbh,$request);
1505: #
1506: $Solved -= $solved;
1507: #
1508: $num = 0 if (! defined($num));
1509: $tries = 0 if (! defined($tries));
1510: $max = 0 if (! defined($max));
1511: $min = 0 if (! defined($min));
1512: $STD = 0 if (! defined($STD));
1513: $Solved = 0 if (! defined($Solved) || $Solved < 0);
1514: $solved = 0 if (! defined($solved));
1515: #
1516: # Compute the more complicated statistics
1517: my $DegOfDiff = 'nan';
1518: $DegOfDiff = 1-($Solved)/$tries if ($tries>0);
1519: #
1520: my $SKEW = 'nan';
1521: my $wrongpercent = 0;
1522: my $numwrong = 'nan';
1523: if ($num > 0) {
1524: ($SKEW) = &execute_SQL_request($dbh,'SELECT SQRT(SUM('.
1525: 'POWER(tries - '.$STD.',3)'.
1526: '))/'.$num.' FROM '.$stats_table);
1527: $numwrong = $num-$Solved;
1528: $wrongpercent=int(10*100*$numwrong/$num)/10;
1529: }
1530: #
1531: # Drop the temporary table
1532: $dbh->do('DROP TABLE '.$stats_table); # May return an error
1533: #
1534: # Return result
1535: return { num_students => $num,
1536: tries => $tries,
1537: max_tries => $max,
1538: min_tries => $min,
1539: mean_tries => $mean,
1540: std_tries => $STD,
1541: skew_tries => $SKEW,
1542: num_solved => $Solved,
1543: num_override => $solved,
1544: num_wrong => $numwrong,
1545: per_wrong => $wrongpercent,
1546: deg_of_diff => $DegOfDiff };
1547: }
1548:
1549: ##
1550: ## This is a helper for get_statistics
1551: sub execute_SQL_request {
1552: my ($dbh,$request)=@_;
1553: # &Apache::lonnet::logthis($request);
1554: my $sth = $dbh->prepare($request);
1555: if (!$sth) {
1556: die($dbh->errstr . " SQL: $request");
1557: }
1558: $sth->execute();
1559: my $row = $sth->fetchrow_arrayref();
1560: if (ref($row) eq 'ARRAY' && scalar(@$row)>0) {
1561: return @$row;
1562: }
1563: return ();
1564: }
1565:
1566:
1567: sub populate_weight_table {
1568: my ($courseid) = @_;
1569: if (! defined($courseid)) {
1570: $courseid = $env{'request.course.id'};
1571: }
1572: #
1573: &setup_table_names($courseid);
1574: my $navmap = Apache::lonnavmaps::navmap->new();
1575: if (!defined($navmap)) {
1576: &Apache::lonnet::logthis('loncoursedata::populate_weight_table:'.$/.
1577: ' unable to get navmaps resource'.$/.
1578: ' '.join(' ',(caller)));
1579: return;
1580: }
1581: my @sequences = $navmap->retrieveResources(undef,
1582: sub { shift->is_map(); },1,0,1);
1583: my @resources;
1584: foreach my $seq (@sequences) {
1585: push(@resources,$navmap->retrieveResources($seq,
1586: sub {shift->is_problem();},
1587: 0,0,0));
1588: }
1589: if (! scalar(@resources)) {
1590: &Apache::lonnet::logthis('loncoursedata::populate_weight_table:'.$/.
1591: ' no resources returned for '.$courseid);
1592: return;
1593: }
1594: # Since we use lonnet::EXT to retrieve problem weights,
1595: # to ensure current data we must clear the caches out.
1596: &Apache::lonnet::clear_EXT_cache_status();
1597: my $dbh = &Apache::lonmysql::get_dbh();
1598: my $request = 'INSERT IGNORE INTO '.$weight_table.
1599: "(symb_id,part_id,weight) VALUES ";
1600: my $weight;
1601: foreach my $res (@resources) {
1602: my $symb_id = &get_symb_id($res->symb);
1603: foreach my $part (@{$res->parts}) {
1604: my $part_id = &get_part_id($part);
1605: $weight = &Apache::lonnet::EXT('resource.'.$part.'.weight',
1606: $res->symb,
1607: undef,undef,undef);
1608: if (!defined($weight) || ($weight eq '')) {
1609: $weight=1;
1610: }
1611: $request .= "('".$symb_id."','".$part_id."','".$weight."'),";
1612: }
1613: }
1614: $request =~ s/(,)$//;
1615: # &Apache::lonnet::logthis('request = '.$/.$request);
1616: $dbh->do($request);
1617: if ($dbh->err()) {
1618: &Apache::lonnet::logthis("error ".$dbh->errstr().
1619: " occurred executing \n".
1620: $request);
1621: }
1622: return;
1623: }
1624:
1625: sub limit_by_start_end_time {
1626: my ($starttime,$endtime,$table) = @_;
1627: my $time_requirements = undef;
1628: if (defined($starttime)) {
1629: $time_requirements .= $table.".timestamp>='".$starttime."'";
1630: if (defined($endtime)) {
1631: $time_requirements .= " AND ".$table.".timestamp<='".$endtime."'";
1632: }
1633: } elsif (defined($endtime)) {
1634: $time_requirements .= $table.".timestamp<='".$endtime."'";
1635: }
1636: return $time_requirements;
1637: }
1638:
1639:
1640: sub limit_by_section_and_status {
1641: my ($Sections,$enrollment,$tablename) = @_;
1642: my $student_requirements = undef;
1643: if ( (defined($Sections) && $Sections->[0] ne 'all')) {
1644: $student_requirements = '('.
1645: join(' OR ', map { $tablename.".section='".$_."'" } @$Sections
1646: ).')';
1647: }
1648: my $enrollment_requirements=undef;
1649: if (defined($enrollment) && $enrollment ne 'Any') {
1650: my $now = time();
1651: if ( $enrollment eq 'Future' ) {
1652: $enrollment_requirements =
1653: "( $tablename.start > $now AND ".
1654: "( $tablename.end = 0 OR $tablename.end > $now))";
1655: } elsif ( $enrollment eq 'Active' ) {
1656: $enrollment_requirements =
1657: "(( $tablename.start = 0 OR $tablename.start < $now ) AND ".
1658: " ( $tablename.end = 0 OR $tablename.end > $now ))";
1659: } elsif ( $enrollment eq 'Expired' ) {
1660: $enrollment_requirements =
1661: "(( $tablename.start < $now ) AND ".
1662: " ( $tablename.end < $now ))";
1663: }
1664: }
1665: return ($student_requirements,$enrollment_requirements);
1666: }
1667:
1668:
1669:
1670: sub limit_by_group {
1671: my ($Groups,$stutable,$grptable,$stugrptab) = @_;
1672: my $groups_join = undef;
1673: my $group_limits = undef;
1674: if ( (defined($Groups) && $Groups->[0] ne 'all')) {
1675: $groups_join =
1676: ' LEFT JOIN '.$students_groups_table.
1677: ' AS '.$stugrptab.' ON '.
1678: $stugrptab.'.student_id = '.$stutable.'.student_id'.
1679: ' LEFT JOIN '.$groupnames_table.
1680: ' AS '.$grptable.' ON '.
1681: $stugrptab.'.group_id = '.$grptable.'.group_id ';
1682: $group_limits =
1683: ' ('.
1684: join(' OR ', map { "$grptable.groupname='".$_."'" } @$Groups
1685: ).')';
1686: }
1687: return ($groups_join,$group_limits);
1688: }
1689:
1690:
1691: sub RNK_student { return 0; };
1692: sub RNK_score { return 1; };
1693:
1694: sub rank_students_by_scores_on_resources {
1695: my ($resources,$Sections,$Groups,$enrollment,$courseid,$starttime,$endtime,
1696: $has_award_for) = @_;
1697: return if (! defined($resources) || ! ref($resources) eq 'ARRAY');
1698: if (! defined($courseid)) {
1699: $courseid = $env{'request.course.id'};
1700: }
1701: #
1702: &setup_table_names($courseid);
1703: my $dbh = &Apache::lonmysql::get_dbh();
1704: my ($section_limits,$enrollment_limits)=
1705: &limit_by_section_and_status($Sections,$enrollment,'b');
1706: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
1707: my $symb_limits = '('.join(' OR ',map {'a.symb_id='.&get_symb_id($_);
1708: } @$resources
1709: ).')';
1710: my ($award_col, $award_join, $award_clause) = ('', '', '');
1711: if ($has_award_for) {
1712: my $resource_id = &get_symb_id($has_award_for);
1713: $award_col = ", perf.awarded";
1714: $award_join = "LEFT JOIN $performance_table AS perf ON perf.symb_id"
1715: ." = $resource_id AND perf.student_id = b.student_id ";
1716: $award_clause = "AND perf.awarded IS NOT NULL";
1717: }
1718: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
1719: my $request = "SELECT b.student,SUM(a.awarded*w.weight) AS score "
1720: ."$award_col FROM $performance_table AS a ".
1721: "NATURAL LEFT JOIN $weight_table AS w ".
1722: "LEFT JOIN $student_table AS b ON a.student_id=b.student_id ".
1723: "$award_join $groups_join ";
1724: my $limits;
1725: if (defined($section_limits)) {
1726: $limits .= $section_limits.' AND ';
1727: }
1728: if (defined($enrollment_limits)) {
1729: $limits .= $enrollment_limits.' AND ';
1730: }
1731: if (defined($time_limits)) {
1732: $limits .= $time_limits.' AND ';
1733: }
1734: if ($symb_limits ne '()') {
1735: $limits .= $symb_limits.' AND ';
1736: }
1737: if (defined($group_limits)) {
1738: $limits .= $group_limits.' AND ';
1739: }
1740: if ($limits) {
1741: $limits =~ s/( AND )$//; # Remove extra conjunction
1742: $request .= "WHERE $limits";
1743: }
1744: $request .= " $award_clause GROUP BY a.student_id ORDER BY score";
1745: #&Apache::lonnet::logthis('request = '.$/.$request);
1746: my $sth = $dbh->prepare($request) or die "Can't prepare $request";
1747: $sth->execute();
1748: my $rows = $sth->fetchall_arrayref();
1749: return ($rows);
1750: }
1751:
1752: sub get_sum_of_scores {
1753: my ($symb,$part,$students,$courseid,$starttime,$endtime) = @_;
1754: if (! defined($courseid)) {
1755: $courseid = $env{'request.course.id'};
1756: }
1757: if (defined($students) &&
1758: ((@$students == 0) ||
1759: (@$students == 1 && (! defined($students->[0]) ||
1760: $students->[0] eq ''))
1761: )
1762: ){
1763: undef($students);
1764: }
1765: #
1766: &setup_table_names($courseid);
1767: my $dbh = &Apache::lonmysql::get_dbh();
1768: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
1769: my $request = 'SELECT SUM(a.awarded*w.weight),SUM(w.weight) FROM '.
1770: $performance_table.' AS a '.
1771: 'NATURAL LEFT JOIN '.$weight_table.' AS w ';
1772: $request .= 'WHERE a.symb_id='.&get_symb_id($symb).
1773: ' AND a.part_id='.&get_part_id($part);
1774: if (defined($time_limits)) {
1775: $request .= ' AND '.$time_limits;
1776: }
1777: if (defined($students)) {
1778: $request .= ' AND ('.
1779: join(' OR ',map {'a.student_id='.&get_student_id(split(':',$_));
1780: } @$students).
1781: ')';
1782: }
1783: my $sth = $dbh->prepare($request);
1784: $sth->execute();
1785: my $rows = $sth->fetchrow_arrayref();
1786: if ($dbh->err) {
1787: &Apache::lonnet::logthis('error 1 = '.$dbh->errstr());
1788: &Apache::lonnet::logthis('prepared then executed, fetchrow_arrayrefed'.
1789: $/.$request);
1790: return (undef,undef);
1791: }
1792: return ($rows->[0],$rows->[1]);
1793: }
1794:
1795:
1796: sub score_stats {
1797: my ($Sections,$Groups,$enrollment,$symbs,$starttime,$endtime,$courseid)=@_;
1798: if (! defined($courseid)) {
1799: $courseid = $env{'request.course.id'};
1800: }
1801: #
1802: &setup_table_names($courseid);
1803: my $dbh = &Apache::lonmysql::get_dbh();
1804: #
1805: my ($section_limits,$enrollment_limits)=
1806: &limit_by_section_and_status($Sections,$enrollment,'b');
1807: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
1808: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
1809: my @Symbids = map { &get_symb_id($_); } @{$symbs};
1810: #
1811: my $stats_table = &temp_table_name($courseid,'problem_stats');
1812: my $symb_restriction = join(' OR ',map {'a.symb_id='.$_;} @Symbids);
1813: my $request = 'DROP TABLE '.$stats_table;
1814: $dbh->do($request);
1815: $request =
1816: 'CREATE TEMPORARY TABLE '.$stats_table.' '.
1817: 'SELECT a.student_id,'.
1818: 'SUM(a.awarded*w.weight) AS score FROM '.
1819: $performance_table.' AS a '.
1820: 'NATURAL LEFT JOIN '.$weight_table.' AS w '.
1821: 'LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id '.
1822: $groups_join;
1823: my $limit = ' WHERE ('.$symb_restriction.')';
1824: if ($time_limits) {
1825: $limit .= ' AND '.$time_limits;
1826: }
1827: if ($section_limits) {
1828: $limit .= ' AND '.$section_limits;
1829: }
1830: if ($enrollment_limits) {
1831: $limit .= ' AND '.$enrollment_limits;
1832: }
1833: if ($group_limits) {
1834: $limit .= ' AND '.$group_limits;
1835: }
1836: $request .= $limit.' GROUP BY a.student_id';
1837: # &Apache::lonnet::logthis('request = '.$/.$request);
1838: my $sth = $dbh->prepare($request);
1839: $sth->execute();
1840: $request =
1841: 'SELECT AVG(score),STD(score),MAX(score),MIN(score),COUNT(score) '.
1842: 'FROM '.$stats_table;
1843: my ($ave,$std,$max,$min,$count) = &execute_SQL_request($dbh,$request);
1844: # &Apache::lonnet::logthis('request = '.$/.$request);
1845:
1846: $request = 'SELECT SUM(weight) FROM '.$weight_table.
1847: ' AS a WHERE ('.$symb_restriction.')';
1848: my ($max_possible) = &execute_SQL_request($dbh,$request);
1849: # &Apache::lonnet::logthis('request = '.$/.$request);
1850: return($min,$max,$ave,$std,$count,$max_possible);
1851: }
1852:
1853:
1854:
1855: sub count_stats {
1856: my ($Sections,$Groups,$enrollment,$symbs,$starttime,$endtime,$courseid)=@_;
1857: if (! defined($courseid)) {
1858: $courseid = $env{'request.course.id'};
1859: }
1860: #
1861: &setup_table_names($courseid);
1862: my $dbh = &Apache::lonmysql::get_dbh();
1863: #
1864: my ($section_limits,$enrollment_limits)=
1865: &limit_by_section_and_status($Sections,$enrollment,'b');
1866: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
1867: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
1868: my @Symbids = map { &get_symb_id($_); } @{$symbs};
1869: #
1870: my $stats_table = &temp_table_name($courseid,'problem_stats');
1871: my $symb_restriction = join(' OR ',map {'a.symb_id='.$_;} @Symbids);
1872: my $request = 'DROP TABLE '.$stats_table;
1873: $dbh->do($request);
1874: $request =
1875: 'CREATE TEMPORARY TABLE '.$stats_table.' '.
1876: 'SELECT a.student_id,'.
1877: 'SUM(a.awarded) AS count FROM '.
1878: $performance_table.' AS a '.
1879: 'LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id '.
1880: $groups_join;
1881: my $limit = ' WHERE ('.$symb_restriction.')';
1882: if ($time_limits) {
1883: $limit .= ' AND '.$time_limits;
1884: }
1885: if ($section_limits) {
1886: $limit .= ' AND '.$section_limits;
1887: }
1888: if ($enrollment_limits) {
1889: $limit .= ' AND '.$enrollment_limits;
1890: }
1891: if ($group_limits) {
1892: $limit .= ' AND '.$group_limits;
1893: }
1894: $request .= $limit.' GROUP BY a.student_id';
1895: # &Apache::lonnet::logthis('request = '.$/.$request);
1896: my $sth = $dbh->prepare($request);
1897: $sth->execute();
1898: $request =
1899: 'SELECT AVG(count),STD(count),MAX(count),MIN(count),COUNT(count) '.
1900: 'FROM '.$stats_table;
1901: my ($ave,$std,$max,$min,$count) = &execute_SQL_request($dbh,$request);
1902: # &Apache::lonnet::logthis('request = '.$/.$request);
1903: return($min,$max,$ave,$std,$count);
1904: }
1905:
1906:
1907: sub get_student_data {
1908: my ($students,$courseid) = @_;
1909: $courseid = $env{'request.course.id'} if (! defined($courseid));
1910: &setup_table_names($courseid);
1911: my $dbh = &Apache::lonmysql::get_dbh();
1912: return undef if (! defined($dbh));
1913: my $request = 'SELECT '.
1914: 'student_id, student '.
1915: 'FROM '.$student_table;
1916: if (defined($students)) {
1917: $request .= ' WHERE ('.
1918: join(' OR ', map {'student_id='.
1919: &get_student_id($_->{'username'},
1920: $_->{'domain'})
1921: } @$students
1922: ).')';
1923: }
1924: $request.= ' ORDER BY student_id';
1925: my $sth = $dbh->prepare($request);
1926: $sth->execute();
1927: if ($dbh->err) {
1928: &Apache::lonnet::logthis('error 2 = '.$dbh->errstr());
1929: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
1930: return undef;
1931: }
1932: my $dataset = $sth->fetchall_arrayref();
1933: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
1934: return $dataset;
1935: }
1936: }
1937:
1938: sub RD_student_id { return 0; }
1939: sub RD_awarddetail { return 1; }
1940: sub RD_response_eval { return 2; }
1941: sub RD_response_eval_2 { return 3; }
1942: sub RD_submission { return 4; }
1943: sub RD_timestamp { return 5; }
1944: sub RD_tries { return 6; }
1945: sub RD_sname { return 7; }
1946:
1947: sub get_response_data {
1948: my ($Sections,$Groups,$enrollment,$symb,$response,$courseid) = @_;
1949: return undef if (! defined($symb) ||
1950: ! defined($response));
1951: $courseid = $env{'request.course.id'} if (! defined($courseid));
1952: #
1953: &setup_table_names($courseid);
1954: my $symb_id = &get_symb_id($symb);
1955: if (! defined($symb_id)) {
1956: &Apache::lonnet::logthis('Unable to find symb for '.$symb.' in '.$courseid);
1957: return undef;
1958: }
1959: my $response_id = &get_part_id($response);
1960: if (! defined($response_id)) {
1961: &Apache::lonnet::logthis('Unable to find id for '.$response.' in '.$courseid);
1962: return undef;
1963: }
1964: #
1965: my $dbh = &Apache::lonmysql::get_dbh();
1966: return undef if (! defined($dbh));
1967: #
1968: my ($student_requirements,$enrollment_requirements) =
1969: &limit_by_section_and_status($Sections,$enrollment,'d');
1970: my ($groups_join,$group_limits) = &limit_by_group($Groups,'d','e','f');
1971: my $request = 'SELECT '.
1972: 'a.student_id, a.awarddetail, a.response_specific_value, '.
1973: 'a.response_specific_value_2, a.submission, b.timestamp, '.
1974: 'c.tries, d.student '.
1975: 'FROM '.$fulldump_response_table.' AS a '.
1976: 'LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
1977: 'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
1978: 'a.transaction = b.transaction '.
1979: 'LEFT JOIN '.$fulldump_part_table.' AS c '.
1980: 'ON a.symb_id=c.symb_id AND a.student_id=c.student_id AND '.
1981: 'a.part_id=c.part_id AND a.transaction = c.transaction '.
1982: 'LEFT JOIN '.$student_table.' AS d '.
1983: 'ON a.student_id=d.student_id '.
1984: $groups_join;
1985: my $limit = ' WHERE '.
1986: 'a.symb_id='.$symb_id.' AND a.response_id='.$response_id;
1987: if (defined($student_requirements)) {
1988: $limit .= ' AND '.$student_requirements;
1989: }
1990: if (defined($enrollment_requirements)) {
1991: $limit .= ' AND '.$enrollment_requirements;
1992: }
1993: if (defined($group_limits)) {
1994: $limit .= ' AND '.$group_limits;
1995: }
1996: $request .= $limit.' ORDER BY b.timestamp';
1997: # &Apache::lonnet::logthis("request =\n".$request);
1998: my $sth = $dbh->prepare($request);
1999: $sth->execute();
2000: if ($dbh->err) {
2001: &Apache::lonnet::logthis('error 3 = '.$dbh->errstr());
2002: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2003: return undef;
2004: }
2005: my $dataset = $sth->fetchall_arrayref();
2006: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2007: # Clear the \'s from around the submission
2008: for (my $i =0;$i<scalar(@$dataset);$i++) {
2009: $dataset->[$i]->[&RD_submission()] =~ s/(\'$|^\')//g;
2010: }
2011: return $dataset;
2012: }
2013: }
2014:
2015:
2016: sub RDs_awarddetail { return 3; }
2017: sub RDs_submission { return 2; }
2018: sub RDs_timestamp { return 1; }
2019: sub RDs_tries { return 0; }
2020: sub RDs_awarded { return 4; }
2021: sub RDs_response_eval { return 5; }
2022: sub RDs_response_eval_2 { return 6; }
2023: sub RDs_part_award { return 7; }
2024:
2025: sub get_response_data_by_student {
2026: my ($student,$symb,$response,$courseid) = @_;
2027: return undef if (! defined($symb) ||
2028: ! defined($response));
2029: $courseid = $env{'request.course.id'} if (! defined($courseid));
2030: #
2031: &setup_table_names($courseid);
2032: my $symb_id = &get_symb_id($symb);
2033: my $response_id = &get_part_id($response);
2034: #
2035: my $student_id = &get_student_id($student->{'username'},
2036: $student->{'domain'});
2037: #
2038: my $dbh = &Apache::lonmysql::get_dbh();
2039: return undef if (! defined($dbh));
2040: my $request = 'SELECT '.
2041: 'c.tries, b.timestamp, a.submission, a.awarddetail, c.awarded, '.
2042: 'a.response_specific_value, a.response_specific_value_2, c.award '.
2043: 'FROM '.$fulldump_response_table.' AS a '.
2044: 'LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
2045: 'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
2046: 'a.transaction = b.transaction '.
2047: 'LEFT JOIN '.$fulldump_part_table.' AS c '.
2048: 'ON a.symb_id=c.symb_id AND a.student_id=c.student_id AND '.
2049: 'a.part_id=c.part_id AND a.transaction = c.transaction '.
2050: 'LEFT JOIN '.$student_table.' AS d '.
2051: 'ON a.student_id=d.student_id '.
2052: 'LEFT JOIN '.$performance_table.' AS e '.
2053: 'ON a.symb_id=e.symb_id AND a.part_id=e.part_id AND '.
2054: 'a.student_id=e.student_id AND c.tries=e.tries '.
2055: 'WHERE '.
2056: 'a.symb_id='.$symb_id.' AND a.response_id='.$response_id.
2057: ' AND a.student_id='.$student_id.' ORDER BY b.timestamp';
2058: # &Apache::lonnet::logthis("request =\n".$request);
2059: my $sth = $dbh->prepare($request);
2060: $sth->execute();
2061: if ($dbh->err) {
2062: &Apache::lonnet::logthis('error 4 = '.$dbh->errstr());
2063: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2064: return undef;
2065: }
2066: my $dataset = $sth->fetchall_arrayref();
2067: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2068: # Clear the \'s from around the submission
2069: for (my $i =0;$i<scalar(@$dataset);$i++) {
2070: $dataset->[$i]->[&RDs_submission] =~ s/(\'$|^\')//g;
2071: }
2072: return $dataset;
2073: }
2074: return undef; # error occurred
2075: }
2076:
2077: sub RT_student_id { return 0; }
2078: sub RT_awarded { return 1; }
2079: sub RT_tries { return 2; }
2080: sub RT_timestamp { return 3; }
2081:
2082: sub get_response_time_data {
2083: my ($sections,$groups,$enrollment,$symb,$part,$courseid) = @_;
2084: return undef if (! defined($symb) ||
2085: ! defined($part));
2086: $courseid = $env{'request.course.id'} if (! defined($courseid));
2087: #
2088: &setup_table_names($courseid);
2089: my $symb_id = &get_symb_id($symb);
2090: if (! defined($symb_id)) {
2091: &Apache::lonnet::logthis('Unable to find symb for '.$symb.' in '.$courseid);
2092: return undef;
2093: }
2094: my $part_id = &get_part_id($part);
2095: if (! defined($part_id)) {
2096: &Apache::lonnet::logthis('Unable to find id for '.$part.' in '.$courseid);
2097: return undef;
2098: }
2099: #
2100: my $dbh = &Apache::lonmysql::get_dbh();
2101: return undef if (! defined($dbh));
2102: my ($student_requirements,$enrollment_requirements) =
2103: &limit_by_section_and_status($sections,$enrollment,'d');
2104: my ($groups_join,$group_limits) = &limit_by_group($groups,'d','e','f');
2105: my $request = 'SELECT '.
2106: 'a.student_id, a.awarded, a.tries, b.timestamp '.
2107: 'FROM '.$fulldump_part_table.' AS a '.
2108: 'LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
2109: 'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
2110: 'a.transaction = b.transaction '.
2111: 'LEFT JOIN '.$student_table.' as d '.
2112: 'ON a.student_id=d.student_id '.
2113: $groups_join;
2114: my $limit = ' WHERE '.
2115: 'a.symb_id='.$symb_id.' AND a.part_id='.$part_id;
2116: if (defined($student_requirements)) {
2117: $limit .= ' AND '.$student_requirements;
2118: }
2119: if (defined($enrollment_requirements)) {
2120: $limit .= ' AND '.$enrollment_requirements;
2121: }
2122: if (defined($group_limits)) {
2123: $limit .= ' AND '.$group_limits;
2124: }
2125: $request .= $limit.' ORDER BY b.timestamp';
2126: # &Apache::lonnet::logthis("request =\n".$request);
2127: my $sth = $dbh->prepare($request);
2128: $sth->execute();
2129: if ($dbh->err) {
2130: &Apache::lonnet::logthis('error 5 = '.$dbh->errstr());
2131: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2132: return undef;
2133: }
2134: my $dataset = $sth->fetchall_arrayref();
2135: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2136: return $dataset;
2137: }
2138:
2139: }
2140:
2141: sub get_student_scores {
2142: my ($sections,$groups,$Symbs,$enrollment,$courseid,$starttime,$endtime) = @_;
2143: $courseid = $env{'request.course.id'} if (! defined($courseid));
2144: &setup_table_names($courseid);
2145: my $dbh = &Apache::lonmysql::get_dbh();
2146: return (undef) if (! defined($dbh));
2147: my $tmptable = &temp_table_name($courseid,'temp_'.time);
2148: my $request = 'DROP TABLE IF EXISTS '.$tmptable;
2149: # &Apache::lonnet::logthis('request = '.$/.$request);
2150: $dbh->do($request);
2151: #
2152: my $symb_requirements;
2153: if (defined($Symbs) && @$Symbs) {
2154: $symb_requirements = '('.
2155: join(' OR ', map{ "(a.symb_id='".&get_symb_id($_->{'symb'}).
2156: "' AND a.part_id='".&get_part_id($_->{'part'}).
2157: "')"
2158: } @$Symbs).')';
2159: }
2160: #
2161: my ($student_requirements,$enrollment_requirements) =
2162: &limit_by_section_and_status($sections,$enrollment,'b');
2163: #
2164: my ($groups_join,$group_limits) = &limit_by_group($groups,'b','d','e');
2165: my $time_requirements = &limit_by_start_end_time($starttime,$endtime,'a');
2166: ##
2167: $request = 'CREATE TEMPORARY TABLE IF NOT EXISTS '.$tmptable.
2168: ' SELECT a.student_id,SUM(a.awarded*c.weight) AS score FROM '.
2169: $performance_table.' AS a ';
2170: $request .= "LEFT JOIN ".$weight_table.' AS c ON a.symb_id=c.symb_id AND a.part_id=c.part_id ';
2171: if (defined($student_requirements) || defined($enrollment_requirements)) {
2172: $request .= ' LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id ';
2173: }
2174: if (defined($groups_join)) {
2175: $request .= $groups_join;
2176: }
2177: if (defined($symb_requirements) ||
2178: defined($student_requirements) ||
2179: defined($enrollment_requirements) ||
2180: defined($group_limits) ) {
2181: $request .= ' WHERE ';
2182: }
2183: if (defined($symb_requirements)) {
2184: $request .= $symb_requirements.' AND ';
2185: }
2186: if (defined($student_requirements)) {
2187: $request .= $student_requirements.' AND ';
2188: }
2189: if (defined($enrollment_requirements)) {
2190: $request .= $enrollment_requirements.' AND ';
2191: }
2192: if (defined($time_requirements)) {
2193: $request .= $time_requirements.' AND ';
2194: }
2195: $request =~ s/ AND $//; # Strip of the trailing ' AND '.
2196: $request .= ' GROUP BY a.student_id';
2197: # &Apache::lonnet::logthis("request = \n".$request);
2198: my $sth = $dbh->prepare($request);
2199: $sth->execute();
2200: if ($dbh->err) {
2201: &Apache::lonnet::logthis('error 6 = '.$dbh->errstr());
2202: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2203: return undef;
2204: }
2205: $request = 'SELECT score,COUNT(*) FROM '.$tmptable.' GROUP BY score';
2206: # &Apache::lonnet::logthis("request = \n".$request);
2207: $sth = $dbh->prepare($request);
2208: $sth->execute();
2209: if ($dbh->err) {
2210: &Apache::lonnet::logthis('error 7 = '.$dbh->errstr());
2211: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2212: return undef;
2213: }
2214: my $dataset = $sth->fetchall_arrayref();
2215: return $dataset;
2216: }
2217:
2218:
2219:
2220: sub setup_table_names {
2221: my ($courseid) = @_;
2222: if (! defined($courseid)) {
2223: $courseid = $env{'request.course.id'};
2224: }
2225: #
2226: if (! defined($current_course) || $current_course ne $courseid) {
2227: # Clear out variables
2228: $have_read_part_table = 0;
2229: undef(%ids_by_part);
2230: undef(%parts_by_id);
2231: $have_read_symb_table = 0;
2232: undef(%ids_by_symb);
2233: undef(%symbs_by_id);
2234: $have_read_student_table = 0;
2235: undef(%ids_by_student);
2236: undef(%students_by_id);
2237: $have_read_groupnames_table = 0;
2238: undef(%ids_by_groupname);
2239: #
2240: $current_course = $courseid;
2241: }
2242: #
2243: # Set up database names
2244: my $base_id = 'md5_'.&Digest::MD5::md5_hex($courseid);
2245: $symb_table = $base_id.'_'.'symb';
2246: $part_table = $base_id.'_'.'part';
2247: $student_table = $base_id.'_'.'student';
2248: $groupnames_table = $base_id.'_'.'groupnames';
2249: $students_groups_table = $base_id.'_'.'studentgroups';
2250: $performance_table = $base_id.'_'.'performance';
2251: $parameters_table = $base_id.'_'.'parameters';
2252: $fulldump_part_table = $base_id.'_'.'partdata';
2253: $fulldump_response_table = $base_id.'_'.'responsedata';
2254: $fulldump_timestamp_table = $base_id.'_'.'timestampdata';
2255: $weight_table = $base_id.'_'.'weight';
2256: #
2257: @Tables = (
2258: $symb_table,
2259: $part_table,
2260: $student_table,
2261: $groupnames_table,
2262: $students_groups_table,
2263: $performance_table,
2264: $parameters_table,
2265: $fulldump_part_table,
2266: $fulldump_response_table,
2267: $fulldump_timestamp_table,
2268: $weight_table,
2269: );
2270: return;
2271: }
2272:
2273: sub temp_table_name {
2274: my ($courseid,$affix) = @_;
2275: my $base_id = 'md5_'.&Digest::MD5::md5_hex($courseid);
2276: return $base_id.'_'.$affix;
2277: }
2278:
2279:
2280: } # End scope of table identifiers
2281:
2282:
2283:
2284: sub CL_SDOM { return 0; }
2285: sub CL_SNAME { return 1; }
2286: sub CL_END { return 2; }
2287: sub CL_START { return 3; }
2288: sub CL_ID { return 4; }
2289: sub CL_SECTION { return 5; }
2290: sub CL_FULLNAME { return 6; }
2291: sub CL_STATUS { return 7; }
2292: sub CL_TYPE { return 8; }
2293: sub CL_LOCKEDTYPE { return 9; }
2294: sub CL_GROUP { return 10; }
2295: sub CL_PERMANENTEMAIL { return 11; }
2296: sub CL_ROLE { return 12; }
2297: sub CL_EXTENT { return 13; }
2298: sub CL_PHOTO { return 14; }
2299: sub CL_THUMBNAIL { return 15; }
2300:
2301: sub get_classlist {
2302: my ($cdom,$cnum) = @_;
2303: my $cid = $cdom.'_'.$cnum;
2304: if (!defined($cdom) || !defined($cnum)) {
2305: $cid = $env{'request.course.id'};
2306: $cdom = $env{'course.'.$cid.'.domain'};
2307: $cnum = $env{'course.'.$cid.'.num'};
2308: }
2309: my $now = time;
2310: #
2311: my %classlist=&Apache::lonnet::dump('classlist',$cdom,$cnum);
2312: while (my ($student,$info) = each(%classlist)) {
2313: if ($student =~ /^(con_lost|error|no_such_host)/i) {
2314: &Apache::lonnet::logthis('get_classlist error for '.$cid.':'.$student);
2315: return undef;
2316: }
2317: my ($sname,$sdom) = split(/:/,$student);
2318: my @Values = split(/:/,$info);
2319: my ($end,$start,$id,$section,$fullname,$type,$lockedtype);
2320: if (@Values > 2) {
2321: ($end,$start,$id,$section,$fullname,$type,$lockedtype) = @Values;
2322: } else { # We have to get the data ourselves
2323: ($end,$start) = @Values;
2324: $section = &Apache::lonnet::getsection($sdom,$sname,$cid);
2325: my %info=&Apache::lonnet::get('environment',
2326: ['firstname','middlename',
2327: 'lastname','generation','id'],
2328: $sdom, $sname);
2329: my ($tmp) = keys(%info);
2330: if ($tmp =~/^(con_lost|error|no_such_host)/i) {
2331: $fullname = 'not available';
2332: $id = 'not available';
2333: &Apache::lonnet::logthis('unable to retrieve environment '.
2334: 'for '.$sname.':'.$sdom);
2335: } else {
2336: $fullname = &Apache::lonnet::format_name(@info{qw/firstname middlename lastname generation/},'lastname');
2337: $id = $info{'id'};
2338: }
2339: # Update the classlist with this students information
2340: if ($fullname ne 'not available') {
2341: my $enrolldata = join(':',$end,$start,$id,$section,$fullname);
2342: my $reply=&Apache::lonnet::cput('classlist',
2343: {$student => $enrolldata},
2344: $cdom,$cnum);
2345: if ($reply !~ /^(ok|delayed)/) {
2346: &Apache::lonnet::logthis('Unable to update classlist for '.
2347: 'student '.$sname.':'.$sdom.
2348: ' error:'.$reply);
2349: }
2350: }
2351: }
2352: my $status='Expired';
2353: if(((!$end) || $now < $end) && ((!$start) || ($now > $start))) {
2354: $status='Active';
2355: }
2356: if(($now < $start) && ((!$end) || $now < $end )) {
2357: $status='Future';
2358: }
2359: $classlist{$student} =
2360: [$sdom,$sname,$end,$start,$id,$section,$fullname,$status,$type,$lockedtype];
2361: }
2362: if (wantarray()) {
2363: return (\%classlist,['domain','username','end','start','id',
2364: 'section','fullname','status','type','lockedtype']);
2365: } else {
2366: return \%classlist;
2367: }
2368: }
2369:
2370: sub get_group_memberships {
2371: my ($classlist,$keylist,$cdom,$cnum) = @_;
2372:
2373: return ({},{}) if (!ref($classlist) || !ref($keylist));
2374:
2375: my $cid = $cdom.'_'.$cnum;
2376: if (!defined($cdom) || !defined($cnum)) {
2377: $cid = $env{'request.course.id'};
2378: $cdom = $env{'course.'.$cid.'.domain'};
2379: $cnum = $env{'course.'.$cid.'.num'};
2380: }
2381: my (%classgroups,%studentgroups);
2382: my $now = time;
2383: my $access_end = $env{'course.'.$cid.'.default_enrollment_end_date'};
2384: my %curr_groups =&Apache::longroup::coursegroups($cdom,$cnum);
2385: if (%curr_groups) {
2386: my $grpindex = &CL_GROUP();
2387: my %groupmemberhash =
2388: &Apache::lonnet::get_group_membership($cdom,$cnum);
2389: foreach my $student (keys(%{$classlist})) {
2390: %{$classgroups{$student}} = ();
2391: my $hasgroup = 0;
2392: foreach my $status ('previous','future','active','aftercourse') {
2393: %{$classgroups{$student}{$status}} = ();
2394: }
2395: foreach my $group (keys(%curr_groups)) {
2396: if (defined($groupmemberhash{$group.':'.$student})) {
2397: my ($end,$start) = split(/:/,$groupmemberhash{$group.':'.
2398: $student});
2399: if ($start == -1) {
2400: next;
2401: } else {
2402: $studentgroups{$group} ++;
2403: $hasgroup = 1;
2404: if ($end && $end < $now) {
2405: $classgroups{$student}{'previous'}{$group} =
2406: $groupmemberhash{$group.':'.$student};
2407: if ($classlist->{$student}[&CL_STATUS()] eq 'Expired') {
2408: if ($access_end && $access_end < $now) {
2409: if ($access_end - $end < 86400) {
2410: $classgroups{$student}{'aftercourse'}{$group} = $groupmemberhash{$group.':'.$student};
2411: }
2412: }
2413: }
2414: } elsif ($now > $start) {
2415: if (!$end || $end > $now) {
2416: $classgroups{$student}{'active'}{$group} =
2417: $groupmemberhash{$group.':'.$student};
2418: }
2419: } else {
2420: $classgroups{$student}{'future'}{$group} =
2421: $groupmemberhash{$group.':'.$student};
2422: }
2423: }
2424: }
2425: }
2426: if (!$hasgroup) {
2427: $studentgroups{'none'} ++;
2428: } else {
2429: $classlist->{$student}->[$grpindex] = join(',',
2430: sort(keys(%{$classgroups{$student}{'active'}})));
2431: }
2432: }
2433: }
2434: return (\%classgroups,\%studentgroups);
2435: }
2436:
2437: sub get_students_groups {
2438: my ($student,$enrollment_status,$classgroups) = @_;
2439: my @studentsgroups = ();
2440: if (ref($$classgroups{$student}{'active'}) eq 'HASH') {
2441: push(@studentsgroups,keys(%{$$classgroups{$student}{'active'}}));
2442: }
2443: if ($enrollment_status eq 'Any') {
2444: foreach my $status ('previous','future') {
2445: if (ref($$classgroups{$student}{$status}) eq 'HASH') {
2446: push(@studentsgroups,keys(%{$$classgroups{$student}{$status}}));
2447: }
2448: }
2449: } else {
2450: if (ref($$classgroups{$student}{'aftercourse'}) eq 'HASH') {
2451: push(@studentsgroups,keys(%{$$classgroups{$student}{'aftercourse'}}));
2452: }
2453: }
2454: return @studentsgroups;
2455: }
2456:
2457:
2458: # ----- END HELPER FUNCTIONS --------------------------------------------
2459:
2460: 1;
2461: __END__
2462:
2463:
2464: =pod
2465:
2466: =head1 NAME
2467:
2468: Apache::loncoursedata
2469:
2470: =head1 SYNOPSIS
2471:
2472: Set of functions that download and process student and course information.
2473:
2474: =head1 PACKAGES USED
2475:
2476: Apache::lonnet
2477: Apache::longroup
2478: Time::HiRes
2479: Apache::lonmysql
2480: LONCAPA
2481: Digest::MD5
2482:
2483: =head1 DOWNLOAD INFORMATION
2484:
2485: This section contains all the functions that get data from other servers
2486: and/or itself.
2487:
2488:
2489:
2490: =head1 LOCAL DATA CACHING SUBROUTINES
2491:
2492: The local caching is done using MySQL. There is no fall-back implementation
2493: if MySQL is not running.
2494:
2495: The programmers interface is to call &get_current_state() or some other
2496: primary interface subroutine (described below). The internals of this
2497: storage system are documented here.
2498:
2499: There are six tables used to store student performance data (the results of
2500: a dumpcurrent). Each of these tables is created in MySQL with a name of
2501: $courseid_*****, where ***** is 'symb', 'part', or whatever is appropriate
2502: for the table. The tables and their purposes are described below.
2503:
2504: Some notes before we get started.
2505:
2506: Each table must have a PRIMARY KEY, which is a column or set of columns which
2507: will serve to uniquely identify a row of data. NULL is not allowed!
2508:
2509: INDEXes work best on integer data.
2510:
2511: JOIN is used to combine data from many tables into one output.
2512:
2513: lonmysql.pm is used for some of the interface, specifically the table creation
2514: calls. The inserts are done in bulk by directly calling the database handler.
2515: The SELECT ... JOIN statement used to retrieve the data does not have an
2516: interface in lonmysql.pm and I shudder at the thought of writing one.
2517:
2518: =head2 Table Descriptions
2519:
2520: =over 4
2521:
2522: =head2 Tables used to store meta information
2523:
2524: The following tables hold data required to keep track of the current status
2525: of a students data in the tables or to look up the students data in the tables.
2526:
2527: =over 4
2528:
2529: =item C<$symb_table>
2530:
2531: The symb_table has two columns. The first is a 'symb_id' and the second
2532: is the text name for the 'symb' (limited to 64k). The 'symb_id' is generated
2533: automatically by MySQL so inserts should be done on this table with an
2534: empty first element. This table has its PRIMARY KEY on the 'symb_id'.
2535:
2536: =item C<$part_table>
2537:
2538: The part_table has two columns. The first is a 'part_id' and the second
2539: is the text name for the 'part' (limited to 100 characters). The 'part_id' is
2540: generated automatically by MySQL so inserts should be done on this table with
2541: an empty first element. This table has its PRIMARY KEY on the 'part' (100
2542: characters) and a KEY on 'part_id'.
2543:
2544: =item C<$student_table>
2545:
2546: The student_table has 7 columns. The first is a 'student_id' assigned by
2547: MySQL. The second is 'student' which is username:domain. The third through
2548: fifth are 'section', 'status' (enrollment status), and 'classification'
2549: (to be used in the future). The sixth and seventh ('updatetime' and
2550: 'fullupdatetime') contain the time of last update and full update of student
2551: data. This table has its PRIMARY KEY on the 'student_id' column and is indexed
2552: on 'student', 'section', and 'status'.
2553:
2554: =item C<$groupnames_table>
2555:
2556: The groupnames_table has 2 columns. The first is a 'group_id' assigned by
2557: MySQL. The second is 'groupname' which is the name of the group in the course.
2558:
2559: =item C<$students_groups_table>
2560:
2561: The students_groups_table has 2 columns. The first is the 'student_id', and the
2562: second is the 'group_id'. These two columns comprise the PRIMARY KEY for this
2563: table, as an individual student may be affiliated with more than one group at
2564: any time. This table is indexed on both student_id and group_id.
2565:
2566: =back
2567:
2568: =head2 Tables used to store current status data
2569:
2570: The following tables store data only about the students current status on
2571: a problem, meaning only the data related to the last attempt on a problem.
2572:
2573: =over 4
2574:
2575: =item C<$performance_table>
2576:
2577: The performance_table has 9 columns. The first three are 'symb_id',
2578: 'student_id', and 'part_id'. These comprise the PRIMARY KEY for this table
2579: and are directly related to the $symb_table, $student_table, and $part_table
2580: described above. MySQL does better indexing on numeric items than text,
2581: so we use these three "index tables". The remaining columns are
2582: 'solved', 'tries', 'awarded', 'award', 'awarddetail', and 'timestamp'.
2583: These are either the MySQL type TINYTEXT or various integers ('tries' and
2584: 'timestamp'). This table has KEYs of 'student_id' and 'symb_id'.
2585: For use of this table, see the functions described below.
2586:
2587: =item C<$parameters_table>
2588:
2589: The parameters_table holds the data that does not fit neatly into the
2590: performance_table. The parameters table has four columns: 'symb_id',
2591: 'student_id', 'parameter', and 'value'. 'symb_id', 'student_id', and
2592: 'parameter' comprise the PRIMARY KEY for this table. 'parameter' is
2593: limited to 255 characters. 'value' is limited to 64k characters.
2594:
2595: =back
2596:
2597: =head2 Tables used for storing historic data
2598:
2599: The following tables are used to store almost all of the transactions a student
2600: has made on a homework problem. See loncapa/docs/homework/datastorage for
2601: specific information about each of the parameters stored.
2602:
2603: =over 4
2604:
2605: =item C<$fulldump_response_table>
2606:
2607: The response table holds data (documented in loncapa/docs/homework/datastorage)
2608: associated with a particular response id which is stored when a student
2609: attempts a problem. The following are the columns of the table, in order:
2610: 'symb_id','part_id','response_id','student_id','transaction','tries',
2611: 'awarddetail', 'response_specific', 'response_specific_value',
2612: 'response_specific_2', 'response_specific_value_2', and 'submission
2613: (the text of the students submission). The primary key is based on the
2614: first five columns listed above.
2615:
2616: =item C<$fulldump_part_table()>
2617:
2618: The part table holds data (documented in loncapa/docs/homework/datastorage)
2619: associated with a particular part id which is stored when a student attempts
2620: a problem. The following are the columns of the table, in order:
2621: 'symb_id','part_id','student_id','transaction','tries','award','awarded',
2622: and 'previous'. The primary key is based on the first five columns listed
2623: above.
2624:
2625: =item C<$fulldump_timestamp_table()>
2626:
2627: The timestamp table holds the timestamps of the transactions which are
2628: stored in $fulldump_response_table and $fulldump_part_table. This data is
2629: about both the response and part data. Columns: 'symb_id','student_id',
2630: 'transaction', and 'timestamp'.
2631: The primary key is based on the first 3 columns.
2632:
2633: =item C<$weight_table()>
2634:
2635: The weight table holds the weight for the problems used in the class.
2636: Whereas the weight of a problem can vary by section and student the data
2637: here is applied to the class as a whole.
2638: Columns: 'symb_id','part_id','response_id','weight'.
2639:
2640: =back
2641:
2642:
2643: =head1 IMPORTANT SUBROUTINES
2644:
2645: Here is a brief overview of the subroutines which are likely to be of
2646: interest:
2647:
2648: =over 4
2649:
2650: =item C<&get_current_state()>
2651:
2652: programmers interface.
2653:
2654: =item C<&init_dbs()>
2655:
2656: table creation
2657:
2658: =item C<&update_student_data()>
2659:
2660: data storage calls
2661:
2662: =item C<&get_student_data_from_performance_cache()>
2663:
2664: data retrieval
2665:
2666: =back
2667:
2668: =head1 OTHER SUBROUTINES
2669:
2670: =over 4
2671:
2672: =item C<&make_into_hash($values)>
2673:
2674: Returns a reference to a hash as described by $values. $values is
2675: assumed to be the result of
2676: join(':',map {&escape($_)} %orighash);
2677:
2678: This is a helper function for get_current_state.
2679:
2680: =item C<&init_dbs()>
2681:
2682: Input: course id
2683:
2684: Output: 0 on success, positive integer on error
2685:
2686: This routine issues the calls to lonmysql to create the tables used to
2687: store student data.
2688:
2689: item C<&delete_caches()>
2690:
2691: This routine drops all the tables associated with a course from the
2692: MySQL database.
2693:
2694: Input: course id (optional, determined by environment if omitted)
2695:
2696: Returns: nothing
2697:
2698: =item C<&get_part_id()>
2699:
2700: Get the MySQL id of a problem part string.
2701:
2702: Input: $part
2703:
2704: Output: undef on error, integer $part_id on success.
2705:
2706: =item C<&get_part()>
2707:
2708: Get the string describing a part from the MySQL id of the problem part.
2709:
2710: Input: $part_id
2711:
2712: Output: undef on error, $part string on success.
2713:
2714: =item C<&get_symb_id()>
2715:
2716: Get the MySQL id of a symb.
2717:
2718: Input: $symb
2719:
2720: Output: undef on error, integer $symb_id on success.
2721:
2722: =item C<&get_symb()>
2723:
2724: Get the symb associated with a MySQL symb_id.
2725:
2726: Input: $symb_id
2727:
2728: Output: undef on error, $symb on success.
2729:
2730: =item C<&get_student_id()>
2731:
2732: Get the MySQL id of a student.
2733:
2734: Input: $sname, $dom
2735:
2736: Output: undef on error, integer $student_id on success.
2737:
2738: =item C<&get_student()>
2739:
2740: Get student username:domain associated with the MySQL student_id.
2741:
2742: Input: $student_id
2743:
2744: Output: undef on error, string $student (username:domain) on success.
2745:
2746: =item C<&clear_internal_caches()>
2747:
2748: Causes the internal caches used in get_student_id, get_student,
2749: get_symb_id, get_symb, get_part_id, and get_part to be undef'd.
2750:
2751: Needs to be called before the first operation with the MySQL database
2752: for a given Apache request.
2753:
2754: =item C<&update_full_student_data($sname,$sdom,$courseid)>
2755:
2756: Does a lonnet::dump on a student to populate the courses tables.
2757:
2758: Input: $sname, $sdom, $courseid
2759:
2760: Output: $returnstatus
2761:
2762: $returnstatus is a string describing any errors that occurred. 'okay' is the
2763: default.
2764:
2765: This subroutine loads a students data using lonnet::dump and inserts
2766: it into the MySQL database. The inserts are done on three tables,
2767: $fulldump_response_table, $fulldump_part_table, and $fulldump_timestamp_table.
2768: The INSERT calls are made directly by this subroutine, not through lonmysql
2769: because we do a 'bulk'insert which takes advantage of MySQLs non-SQL
2770: compliant INSERT command to insert multiple rows at a time.
2771: If anything has gone wrong during this process, $returnstatus is updated with
2772: a description of the error.
2773:
2774: Once the "fulldump" tables are updated, the tables used for chart and
2775: spreadsheet (which hold only the current state of the student on their
2776: homework, not historical data) are updated. If all updates have occurred
2777: successfully, $student_table is updated to reflect the time of the update.
2778:
2779: Notice we do not insert the data and immediately query it. This means it
2780: is possible for there to be data returned this first time that is not
2781: available the second time. CYA.
2782:
2783:
2784: =item C<&update_student_data()>
2785:
2786: Input: $sname, $sdom, $courseid
2787:
2788: Output: $returnstatus, \%student_data
2789:
2790: $returnstatus is a string describing any errors that occurred. 'okay' is the
2791: default.
2792: \%student_data is the data returned by a call to lonnet::currentdump.
2793:
2794: This subroutine loads a students data using lonnet::currentdump and inserts
2795: it into the MySQL database. The inserts are done on two tables,
2796: $performance_table and $parameters_table. $parameters_table holds the data
2797: that is not included in $performance_table. See the description of
2798: $performance_table elsewhere in this file. The INSERT calls are made
2799: directly by this subroutine, not through lonmysql because we do a 'bulk'
2800: insert which takes advantage of MySQLs non-SQL compliant INSERT command to
2801: insert multiple rows at a time. If anything has gone wrong during this
2802: process, $returnstatus is updated with a description of the error and
2803: \%student_data is returned.
2804:
2805: Notice we do not insert the data and immediately query it. This means it
2806: is possible for there to be data returned this first time that is not
2807: available the second time. CYA.
2808:
2809: =item &ensure_tables_are_set_up($courseid)
2810:
2811: Checks to be sure the MySQL tables for the given class are set up.
2812: If $courseid is omitted it will be obtained from the environment.
2813:
2814: Returns nothing on success and 'error' on failure
2815:
2816:
2817: =item C<&ensure_current_data()>
2818:
2819: Input: $sname, $sdom, $courseid
2820:
2821: Output: $status, $data
2822:
2823: This routine ensures the data for a given student is up to date.
2824: The $student_table is queried to determine the time of the last update.
2825: If the students data is out of date, &update_student_data() is called.
2826: The return values from the call to &update_student_data() are returned.
2827:
2828: =item C<&ensure_current_full_data($sname,$sdom,$courseid)>
2829:
2830: Input: $sname, $sdom, $courseid
2831:
2832: Output: $status
2833:
2834: This routine ensures the fulldata (the data from a lonnet::dump, not a
2835: lonnet::currentdump) for a given student is up to date.
2836: The $student_table is queried to determine the time of the last update.
2837: If the students fulldata is out of date, &update_full_student_data() is
2838: called.
2839:
2840: The return value from the call to &update_full_student_data() is returned.
2841:
2842: =item C<&get_student_data_from_performance_cache()>
2843:
2844: Input: $sname, $sdom, $symb, $courseid
2845:
2846: Output: hash reference containing the data for the given student.
2847: If $symb is undef, all the students data is returned.
2848:
2849: This routine is the heart of the local caching system. See the description
2850: of $performance_table, $symb_table, $student_table, and $part_table. The
2851: main task is building the MySQL request. The tables appear in the request
2852: in the order in which they should be parsed by MySQL. When searching
2853: on a student the $student_table is used to locate the 'student_id'. All
2854: rows in $performance_table which have a matching 'student_id' are returned,
2855: with data from $part_table and $symb_table which match the entries in
2856: $performance_table, 'part_id' and 'symb_id'. When searching on a symb,
2857: the $symb_table is processed first, with matching rows grabbed from
2858: $performance_table and filled in from $part_table and $student_table in
2859: that order.
2860:
2861: Running 'EXPLAIN ' on the 'SELECT' statements generated can be quite
2862: interesting, especially if you play with the order the tables are listed.
2863:
2864:
2865: =item C<&get_current_state()>
2866:
2867: Input: $sname,$sdom,$symb,$courseid
2868:
2869: Output: Described below
2870:
2871: Retrieve the current status of a students performance. $sname and
2872: $sdom are the only required parameters. If $symb is undef the results
2873: of an &Apache::lonnet::currentdump() will be returned.
2874: If $courseid is undef it will be retrieved from the environment.
2875:
2876: The return structure is based on &Apache::lonnet::currentdump. If
2877: $symb is unspecified, all the students data is returned in a hash of
2878: the form:
2879: (
2880: symb1 => { param1 => value1, param2 => value2 ... },
2881: symb2 => { param1 => value1, param2 => value2 ... },
2882: )
2883:
2884: If $symb is specified, a hash of
2885: (
2886: param1 => value1,
2887: param2 => value2,
2888: )
2889: is returned.
2890:
2891: If no data is found for $symb, or if the student has no performance data,
2892: an empty list is returned.
2893:
2894: =item C<&get_problem_statistics()>
2895:
2896: Gather data on a given problem. The database is assumed to be
2897: populated and all local caching variables are assumed to be set
2898: properly. This means you need to call &ensure_current_data for
2899: the students you are concerned with prior to calling this routine.
2900:
2901: Inputs: $Sections, Groups, $status, $symb, $part, $courseid, $starttime,
2902: $endtime
2903:
2904: =over 4
2905:
2906: =item $Sections Array ref containing section names for students.
2907: 'all' is allowed to be the first (and only) item in the array.
2908:
2909: =item $Groups Array ref containing group names for students.
2910: 'all' is allowed to be the first (and only) item in the array.
2911:
2912: =item $status String describing the status of students
2913:
2914: =item $symb is the symb for the problem.
2915:
2916: =item $part is the part id you need statistics for
2917:
2918: =item $courseid is the course id, of course!
2919:
2920: =item $starttime and $endtime are unix times which to use to limit
2921: the statistical data.
2922:
2923: =back
2924:
2925: Outputs: See the code for up to date information. A hash reference is
2926: returned. The hash has the following keys defined:
2927:
2928: =over 4
2929:
2930: =item * num_students
2931:
2932: The number of students attempting the problem
2933:
2934: =item tries
2935:
2936: The total number of tries for the students
2937:
2938: =item max_tries
2939:
2940: The maximum number of tries taken
2941:
2942: =item mean_tries
2943:
2944: The average number of tries
2945:
2946: =item num_solved T
2947:
2948: he number of students able to solve the problem
2949:
2950: =item num_override
2951:
2952: The number of students whose answer is 'correct_by_override'
2953:
2954: =item deg_of_diff
2955:
2956: The degree of difficulty of the problem
2957:
2958: =item std_tries
2959:
2960: The standard deviation of the number of tries
2961:
2962: =item skew_tries
2963:
2964: The skew of the number of tries
2965:
2966: =item per_wrong
2967:
2968: The number of students attempting the problem who were not
2969: able to answer it correctly.
2970:
2971: =back
2972:
2973: =item C<&populate_weight_table()>
2974:
2975: =item C<&limit_by_start_end_times()>
2976:
2977: Build SQL WHERE condition which limits the data collected by the start
2978: and end times provided
2979:
2980: Inputs: $starttime, $endtime, $table
2981:
2982: Returns: $time_limits
2983:
2984:
2985: =item C<&limit_by_section_and_status()C<
2986:
2987: Build SQL WHERE condition which limits the data collected by section and
2988: student status.
2989:
2990: Inputs: $Sections (array ref)
2991: $enrollment (string: 'any', 'expired', 'active')
2992: $tablename The name of the table that holds the student data
2993:
2994: Returns: $student_requirements,$enrollment_requirements
2995:
2996: =item C<&limit_by_group()>
2997:
2998: Build SQL LEFT JOIN statement to include students_groups and groupnames tables and SQL WHERE condition which limits the data collected by group.
2999:
3000: Inputs: $Groups (array ref)
3001: $stutable The name of the table which holds the student data.
3002: $grptable The name of the table which maps group_id to groupname.
3003: $stugrptab The name of the table which holds student group affiliations.
3004: Returns: $groups_join,$group_limits
3005: $groups_join JOIN part of SQL statement (to include group related tables)
3006: $group_limits SQL WHERE condition limiting to requested groups
3007:
3008: =item C<rank_students_by_scores_on_resources()>
3009:
3010: Inputs:
3011: $resources: array ref of hash ref. Each hash ref needs key 'symb'.
3012: $Sections: array ref of sections to include,
3013: $Groups: array ref of groups to include.
3014: $enrollment: string,
3015: $courseid (may be omitted)
3016: $starttime (may be omitted)
3017: $endtime (may be omitted)
3018: $has_award_for (may be omitted)
3019:
3020: Returns; An array of arrays. The sub arrays contain a student name and
3021: their score on the resources. $starttime and $endtime constrain the
3022: list to awards obtained during the given time limits. $has_score_on
3023: constrains the list to those students who at least attempted the
3024: resource identified by the given symb, which is used to filter out
3025: such students for statistics that would be adversely affected by such
3026: students.
3027:
3028: =item C<&get_sum_of_scores>
3029:
3030: Inputs: $resource (hash ref, needs {'symb'} key),
3031: $part, (the part id),
3032: $students (array ref, contents of array are scalars holding 'sname:sdom'),
3033: $courseid
3034:
3035: Returns: the sum of the score on the problem part over the students and the
3036: maximum possible value for the sum (taken from the weight table).
3037:
3038:
3039: =item C<&score_stats()>
3040:
3041: Inputs: $Sections, $enrollment, $symbs, $starttime,
3042: $endtime, $courseid
3043:
3044: $Sections, $enrollment, $starttime, $endtime, and $courseid are the same as
3045: elsewhere in this module.
3046: $symbs is an array ref of symbs
3047:
3048: Returns: minimum, maximum, mean, s.d., number of students, and maximum
3049: possible of student scores on the given resources
3050:
3051: =item C<&count_stats()>
3052:
3053: Inputs: $Sections, $Groups, $enrollment, $symbs, $starttime,
3054: $endtime, $courseid
3055:
3056: $Sections, $Groups $enrollment, $starttime, $endtime, and $courseid are the
3057: same as elsewhere in this module.
3058: $symbs is an array ref of symbs
3059:
3060: Returns: minimum, maximum, mean, s.d., and number of students
3061: of the number of items correct on the given resources
3062:
3063: =item C<get_student_data()>
3064:
3065: =item C<&get_student_scores($Sections,$Groups,$Symbs,$enrollment,$courseid)>
3066:
3067: =item C<&setup_table_names()>
3068:
3069: input: course id
3070:
3071: output: none
3072:
3073: =back
3074:
3075: =head3 End of Local Data Caching Subroutines
3076:
3077: =head3 Classlist Subroutines
3078:
3079: =over
3080:
3081: =item &get_classlist();
3082:
3083: Retrieve the classist of a given class or of the current class. Student
3084: information is returned from the classlist.db file and, if needed,
3085: from the students environment.
3086:
3087: Optional arguments are $cdom, and $cnum (course domain,
3088: and course number, respectively). If either is ommitted the course
3089: will be taken from the current environment ($env{'request.course.id'},
3090: $env{'course.'.$cid.'.domain'}, and $env{'course.'.$cid.'.num'}).
3091:
3092: Returns a reference to a hash which contains:
3093: keys '$sname:$sdom'
3094: values [$sdom,$sname,$end,$start,$id,$section,$fullname,$status,$type,$lockedtype]
3095:
3096: The constant values CL_SDOM, CL_SNAME, CL_END, etc. can be used
3097: as indices into the returned list to future-proof clients against
3098: changes in the list order.
3099:
3100: =back
3101:
3102: =cut
3103:
3104:
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/back.gif){kind=icon}
Return to loncoursedata.pm CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [LON-CAPA] / loncom / interface