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loncoursedata.pm
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Thu May 18 01:08:51 2006 UTC (18 years, 1 month ago) by
raeburn
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&coursegroups() and &get_group_settings() moved to longroup.pm, which contains general utility functions for asking about groups. Also contains &group_changes() which is used to add/drop group memberships as a result of role changes, as determined by group settings for auto-add and auto-drop. 'none' and 'all' are now reserved words which may not be used as section or group names, so they can be used instead of _all and _none when specifying auto-add and auto-drop settings for all sections or no section roles.
1: # The LearningOnline Network with CAPA
2: #
3: # $Id: loncoursedata.pm,v 1.171 2006/05/18 01:08:51 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:
29: =pod
30:
31: =head1 NAME
32:
33: loncoursedata
34:
35: =head1 SYNOPSIS
36:
37: Set of functions that download and process student and course information.
38:
39: =head1 PACKAGES USED
40:
41: Apache::Constants qw(:common :http)
42: Apache::lonnet()
43: Apache::lonhtmlcommon
44: HTML::TokeParser
45: GDBM_File
46:
47: =cut
48:
49: package Apache::loncoursedata;
50:
51: use strict;
52: use Apache::lonnet;
53: use Apache::lonhtmlcommon;
54: use Apache::longroup;
55: use Time::HiRes;
56: use Apache::lonmysql;
57: use HTML::TokeParser;
58: use GDBM_File;
59:
60: =pod
61:
62: =head1 DOWNLOAD INFORMATION
63:
64: This section contains all the functions that get data from other servers
65: and/or itself.
66:
67: =cut
68:
69: ################################################
70: ################################################
71:
72: =pod
73:
74: =item &make_into_hash($values);
75:
76: Returns a reference to a hash as described by $values. $values is
77: assumed to be the result of
78: join(':',map {&Apache::lonnet::escape($_)} %orighash);
79:
80: This is a helper function for get_current_state.
81:
82: =cut
83:
84: ################################################
85: ################################################
86: sub make_into_hash {
87: my $values = shift;
88: my %tmp = map { &Apache::lonnet::unescape($_); }
89: split(':',$values);
90: return \%tmp;
91: }
92:
93:
94: ################################################
95: ################################################
96:
97: =pod
98:
99: =head1 LOCAL DATA CACHING SUBROUTINES
100:
101: The local caching is done using MySQL. There is no fall-back implementation
102: if MySQL is not running.
103:
104: The programmers interface is to call &get_current_state() or some other
105: primary interface subroutine (described below). The internals of this
106: storage system are documented here.
107:
108: There are six tables used to store student performance data (the results of
109: a dumpcurrent). Each of these tables is created in MySQL with a name of
110: $courseid_*****, where ***** is 'symb', 'part', or whatever is appropriate
111: for the table. The tables and their purposes are described below.
112:
113: Some notes before we get started.
114:
115: Each table must have a PRIMARY KEY, which is a column or set of columns which
116: will serve to uniquely identify a row of data. NULL is not allowed!
117:
118: INDEXes work best on integer data.
119:
120: JOIN is used to combine data from many tables into one output.
121:
122: lonmysql.pm is used for some of the interface, specifically the table creation
123: calls. The inserts are done in bulk by directly calling the database handler.
124: The SELECT ... JOIN statement used to retrieve the data does not have an
125: interface in lonmysql.pm and I shudder at the thought of writing one.
126:
127: =head3 Table Descriptions
128:
129: =over 4
130:
131: =item Tables used to store meta information
132:
133: The following tables hold data required to keep track of the current status
134: of a students data in the tables or to look up the students data in the tables.
135:
136: =over 4
137:
138: =item $symb_table
139:
140: The symb_table has two columns. The first is a 'symb_id' and the second
141: is the text name for the 'symb' (limited to 64k). The 'symb_id' is generated
142: automatically by MySQL so inserts should be done on this table with an
143: empty first element. This table has its PRIMARY KEY on the 'symb_id'.
144:
145: =item $part_table
146:
147: The part_table has two columns. The first is a 'part_id' and the second
148: is the text name for the 'part' (limited to 100 characters). The 'part_id' is
149: generated automatically by MySQL so inserts should be done on this table with
150: an empty first element. This table has its PRIMARY KEY on the 'part' (100
151: characters) and a KEY on 'part_id'.
152:
153: =item $student_table
154:
155: The student_table has 7 columns. The first is a 'student_id' assigned by
156: MySQL. The second is 'student' which is username:domain. The third through
157: fifth are 'section', 'status' (enrollment status), and 'classification'
158: (to be used in the future). The sixth and seventh ('updatetime' and
159: 'fullupdatetime') contain the time of last update and full update of student
160: data. This table has its PRIMARY KEY on the 'student_id' column and is indexed
161: on 'student', 'section', and 'status'.
162:
163: =item $groupnames_table
164:
165: The groupnames_table has 2 columns. The first is a 'group_id' assigned by
166: MySQL. The second is 'groupname' which is the name of the group in the course.
167:
168: =item $students_groups_table
169:
170: The students_groups_table has 2 columns. The first is the 'student_id', and the
171: second is the 'group_id'. These two columns comprise the PRIMARY KEY for this
172: table, as an individual student may be affiliated with more than one group at
173: any time. This table is indexed on both student_id and group_id.
174:
175: =back
176:
177: =item Tables used to store current status data
178:
179: The following tables store data only about the students current status on
180: a problem, meaning only the data related to the last attempt on a problem.
181:
182: =over 4
183:
184: =item $performance_table
185:
186: The performance_table has 9 columns. The first three are 'symb_id',
187: 'student_id', and 'part_id'. These comprise the PRIMARY KEY for this table
188: and are directly related to the $symb_table, $student_table, and $part_table
189: described above. MySQL does better indexing on numeric items than text,
190: so we use these three "index tables". The remaining columns are
191: 'solved', 'tries', 'awarded', 'award', 'awarddetail', and 'timestamp'.
192: These are either the MySQL type TINYTEXT or various integers ('tries' and
193: 'timestamp'). This table has KEYs of 'student_id' and 'symb_id'.
194: For use of this table, see the functions described below.
195:
196: =item $parameters_table
197:
198: The parameters_table holds the data that does not fit neatly into the
199: performance_table. The parameters table has four columns: 'symb_id',
200: 'student_id', 'parameter', and 'value'. 'symb_id', 'student_id', and
201: 'parameter' comprise the PRIMARY KEY for this table. 'parameter' is
202: limited to 255 characters. 'value' is limited to 64k characters.
203:
204: =back
205:
206: =item Tables used for storing historic data
207:
208: The following tables are used to store almost all of the transactions a student
209: has made on a homework problem. See loncapa/docs/homework/datastorage for
210: specific information about each of the parameters stored.
211:
212: =over 4
213:
214: =item $fulldump_response_table
215:
216: The response table holds data (documented in loncapa/docs/homework/datastorage)
217: associated with a particular response id which is stored when a student
218: attempts a problem. The following are the columns of the table, in order:
219: 'symb_id','part_id','response_id','student_id','transaction','tries',
220: 'awarddetail', 'response_specific', 'response_specific_value',
221: 'response_specific_2', 'response_specific_value_2', and 'submission
222: (the text of the students submission). The primary key is based on the
223: first five columns listed above.
224:
225: =item $fulldump_part_table
226:
227: The part table holds data (documented in loncapa/docs/homework/datastorage)
228: associated with a particular part id which is stored when a student attempts
229: a problem. The following are the columns of the table, in order:
230: 'symb_id','part_id','student_id','transaction','tries','award','awarded',
231: and 'previous'. The primary key is based on the first five columns listed
232: above.
233:
234: =item $fulldump_timestamp_table
235:
236: The timestamp table holds the timestamps of the transactions which are
237: stored in $fulldump_response_table and $fulldump_part_table. This data is
238: about both the response and part data. Columns: 'symb_id','student_id',
239: 'transaction', and 'timestamp'.
240: The primary key is based on the first 3 columns.
241:
242: =item $weight_table
243:
244: The weight table holds the weight for the problems used in the class.
245: Whereas the weight of a problem can vary by section and student the data
246: here is applied to the class as a whole.
247: Columns: 'symb_id','part_id','response_id','weight'.
248:
249: =back
250:
251: =back
252:
253: =head3 Important Subroutines
254:
255: Here is a brief overview of the subroutines which are likely to be of
256: interest:
257:
258: =over 4
259:
260: =item &get_current_state(): programmers interface.
261:
262: =item &init_dbs(): table creation
263:
264: =item &update_student_data(): data storage calls
265:
266: =item &get_student_data_from_performance_cache(): data retrieval
267:
268: =back
269:
270: =head3 Main Documentation
271:
272: =over 4
273:
274: =cut
275:
276: ################################################
277: ################################################
278:
279: ################################################
280: ################################################
281: { # Begin scope of table identifiers
282:
283: my $current_course ='';
284: my $symb_table;
285: my $part_table;
286: my $student_table;
287: my $groupnames_table;
288: my $students_groups_table;
289: my $performance_table;
290: my $parameters_table;
291: my $fulldump_response_table;
292: my $fulldump_part_table;
293: my $fulldump_timestamp_table;
294: my $weight_table;
295:
296: my @Tables;
297: ################################################
298: ################################################
299:
300: =pod
301:
302: =item &init_dbs()
303:
304: Input: course id
305:
306: Output: 0 on success, positive integer on error
307:
308: This routine issues the calls to lonmysql to create the tables used to
309: store student data.
310:
311: =cut
312:
313: ################################################
314: ################################################
315: sub init_dbs {
316: my ($courseid,$drop) = @_;
317: &setup_table_names($courseid);
318: #
319: # Drop any of the existing tables
320: if ($drop) {
321: foreach my $table (@Tables) {
322: &Apache::lonmysql::drop_table($table);
323: }
324: }
325: #
326: # Note - changes to this table must be reflected in the code that
327: # stores the data (calls &Apache::lonmysql::store_row with this table
328: # id
329: my $symb_table_def = {
330: id => $symb_table,
331: permanent => 'no',
332: columns => [{ name => 'symb_id',
333: type => 'MEDIUMINT UNSIGNED',
334: restrictions => 'NOT NULL',
335: auto_inc => 'yes', },
336: { name => 'symb',
337: type => 'MEDIUMTEXT',
338: restrictions => 'NOT NULL'},
339: ],
340: 'PRIMARY KEY' => ['symb_id'],
341: };
342: #
343: my $part_table_def = {
344: id => $part_table,
345: permanent => 'no',
346: columns => [{ name => 'part_id',
347: type => 'MEDIUMINT UNSIGNED',
348: restrictions => 'NOT NULL',
349: auto_inc => 'yes', },
350: { name => 'part',
351: type => 'VARCHAR(100) BINARY',
352: restrictions => 'NOT NULL'},
353: ],
354: 'PRIMARY KEY' => ['part (100)'],
355: 'KEY' => [{ columns => ['part_id']},],
356: };
357: #
358: my $student_table_def = {
359: id => $student_table,
360: permanent => 'no',
361: columns => [{ name => 'student_id',
362: type => 'MEDIUMINT UNSIGNED',
363: restrictions => 'NOT NULL',
364: auto_inc => 'yes', },
365: { name => 'student',
366: type => 'VARCHAR(100) BINARY',
367: restrictions => 'NOT NULL UNIQUE'},
368: { name => 'section',
369: type => 'VARCHAR(100) BINARY',
370: restrictions => 'NOT NULL'},
371: { name => 'status',
372: type => 'VARCHAR(15) BINARY',
373: restrictions => 'NOT NULL'},
374: { name => 'classification',
375: type => 'VARCHAR(100) BINARY', },
376: { name => 'updatetime',
377: type => 'INT UNSIGNED'},
378: { name => 'fullupdatetime',
379: type => 'INT UNSIGNED'},
380: ],
381: 'PRIMARY KEY' => ['student_id'],
382: 'KEY' => [{ columns => ['student (100)',
383: 'section (100)',
384: 'status (15)',]},],
385: };
386: #
387: my $groupnames_table_def = {
388: id => $groupnames_table,
389: permanent => 'no',
390: columns => [{ name => 'group_id',
391: type => 'MEDIUMINT UNSIGNED',
392: restrictions => 'NOT NULL',
393: auto_inc => 'yes', },
394: { name => 'groupname',
395: type => 'VARCHAR(100) BINARY',
396: restrictions => 'NOT NULL UNIQUE'},
397: ],
398: 'PRIMARY KEY' => ['group_id'],
399: 'KEY' => [{ columns => ['groupname (100)',]},],
400: };
401: #
402: my $students_groups_table_def = {
403: id => $students_groups_table,
404: permanent => 'no',
405: columns => [{ name => 'student_id',
406: type => 'MEDIUMINT UNSIGNED',
407: restrictions => 'NOT NULL', },
408: { name => 'group_id',
409: type => 'MEDIUMINT UNSIGNED',
410: restrictions => 'NOT NULL', },
411: ],
412: 'PRIMARY KEY' => ['student_id','group_id'],
413: 'KEY' => [{ columns => ['student_id'] },
414: { columns => ['group_id'] },],
415: };
416: #
417: my $performance_table_def = {
418: id => $performance_table,
419: permanent => 'no',
420: columns => [{ name => 'symb_id',
421: type => 'MEDIUMINT UNSIGNED',
422: restrictions => 'NOT NULL' },
423: { name => 'student_id',
424: type => 'MEDIUMINT UNSIGNED',
425: restrictions => 'NOT NULL' },
426: { name => 'part_id',
427: type => 'MEDIUMINT UNSIGNED',
428: restrictions => 'NOT NULL' },
429: { name => 'part',
430: type => 'VARCHAR(100) BINARY',
431: restrictions => 'NOT NULL'},
432: { name => 'solved',
433: type => 'TINYTEXT' },
434: { name => 'tries',
435: type => 'SMALLINT UNSIGNED' },
436: { name => 'awarded',
437: type => 'REAL' },
438: { name => 'award',
439: type => 'TINYTEXT' },
440: { name => 'awarddetail',
441: type => 'TINYTEXT' },
442: { name => 'timestamp',
443: type => 'INT UNSIGNED'},
444: ],
445: 'PRIMARY KEY' => ['symb_id','student_id','part_id'],
446: 'KEY' => [{ columns=>['student_id'] },
447: { columns=>['symb_id'] },],
448: };
449: #
450: my $fulldump_part_table_def = {
451: id => $fulldump_part_table,
452: permanent => 'no',
453: columns => [
454: { name => 'symb_id',
455: type => 'MEDIUMINT UNSIGNED',
456: restrictions => 'NOT NULL' },
457: { name => 'part_id',
458: type => 'MEDIUMINT UNSIGNED',
459: restrictions => 'NOT NULL' },
460: { name => 'student_id',
461: type => 'MEDIUMINT UNSIGNED',
462: restrictions => 'NOT NULL' },
463: { name => 'transaction',
464: type => 'MEDIUMINT UNSIGNED',
465: restrictions => 'NOT NULL' },
466: { name => 'tries',
467: type => 'SMALLINT UNSIGNED',
468: restrictions => 'NOT NULL' },
469: { name => 'award',
470: type => 'TINYTEXT' },
471: { name => 'awarded',
472: type => 'REAL' },
473: { name => 'previous',
474: type => 'SMALLINT UNSIGNED' },
475: # { name => 'regrader',
476: # type => 'TINYTEXT' },
477: # { name => 'afterduedate',
478: # type => 'TINYTEXT' },
479: ],
480: 'PRIMARY KEY' => ['symb_id','part_id','student_id','transaction'],
481: 'KEY' => [
482: { columns=>['symb_id'] },
483: { columns=>['part_id'] },
484: { columns=>['student_id'] },
485: ],
486: };
487: #
488: my $fulldump_response_table_def = {
489: id => $fulldump_response_table,
490: permanent => 'no',
491: columns => [
492: { name => 'symb_id',
493: type => 'MEDIUMINT UNSIGNED',
494: restrictions => 'NOT NULL' },
495: { name => 'part_id',
496: type => 'MEDIUMINT UNSIGNED',
497: restrictions => 'NOT NULL' },
498: { name => 'response_id',
499: type => 'MEDIUMINT UNSIGNED',
500: restrictions => 'NOT NULL' },
501: { name => 'student_id',
502: type => 'MEDIUMINT UNSIGNED',
503: restrictions => 'NOT NULL' },
504: { name => 'transaction',
505: type => 'MEDIUMINT UNSIGNED',
506: restrictions => 'NOT NULL' },
507: { name => 'awarddetail',
508: type => 'TINYTEXT' },
509: # { name => 'message',
510: # type => 'CHAR BINARY'},
511: { name => 'response_specific',
512: type => 'TINYTEXT' },
513: { name => 'response_specific_value',
514: type => 'TINYTEXT' },
515: { name => 'response_specific_2',
516: type => 'TINYTEXT' },
517: { name => 'response_specific_value_2',
518: type => 'TINYTEXT' },
519: { name => 'submission',
520: type => 'TEXT'},
521: ],
522: 'PRIMARY KEY' => ['symb_id','part_id','response_id','student_id',
523: 'transaction'],
524: 'KEY' => [
525: { columns=>['symb_id'] },
526: { columns=>['part_id','response_id'] },
527: { columns=>['student_id'] },
528: ],
529: };
530: my $fulldump_timestamp_table_def = {
531: id => $fulldump_timestamp_table,
532: permanent => 'no',
533: columns => [
534: { name => 'symb_id',
535: type => 'MEDIUMINT UNSIGNED',
536: restrictions => 'NOT NULL' },
537: { name => 'student_id',
538: type => 'MEDIUMINT UNSIGNED',
539: restrictions => 'NOT NULL' },
540: { name => 'transaction',
541: type => 'MEDIUMINT UNSIGNED',
542: restrictions => 'NOT NULL' },
543: { name => 'timestamp',
544: type => 'INT UNSIGNED'},
545: ],
546: 'PRIMARY KEY' => ['symb_id','student_id','transaction'],
547: 'KEY' => [
548: { columns=>['symb_id'] },
549: { columns=>['student_id'] },
550: { columns=>['transaction'] },
551: ],
552: };
553: #
554: my $parameters_table_def = {
555: id => $parameters_table,
556: permanent => 'no',
557: columns => [{ name => 'symb_id',
558: type => 'MEDIUMINT UNSIGNED',
559: restrictions => 'NOT NULL' },
560: { name => 'student_id',
561: type => 'MEDIUMINT UNSIGNED',
562: restrictions => 'NOT NULL' },
563: { name => 'parameter',
564: type => 'TINYTEXT',
565: restrictions => 'NOT NULL' },
566: { name => 'value',
567: type => 'MEDIUMTEXT' },
568: ],
569: 'PRIMARY KEY' => ['symb_id','student_id','parameter (255)'],
570: };
571: #
572: my $weight_table_def = {
573: id => $weight_table,
574: permanent => 'no',
575: columns => [{ name => 'symb_id',
576: type => 'MEDIUMINT UNSIGNED',
577: restrictions => 'NOT NULL' },
578: { name => 'part_id',
579: type => 'MEDIUMINT UNSIGNED',
580: restrictions => 'NOT NULL' },
581: { name => 'weight',
582: type => 'REAL',
583: restrictions => 'NOT NULL' },
584: ],
585: 'PRIMARY KEY' => ['symb_id','part_id'],
586: };
587: #
588: # Create the tables
589: my $tableid;
590: $tableid = &Apache::lonmysql::create_table($symb_table_def);
591: if (! defined($tableid)) {
592: &Apache::lonnet::logthis("error creating symb_table: ".
593: &Apache::lonmysql::get_error());
594: return 1;
595: }
596: #
597: $tableid = &Apache::lonmysql::create_table($part_table_def);
598: if (! defined($tableid)) {
599: &Apache::lonnet::logthis("error creating part_table: ".
600: &Apache::lonmysql::get_error());
601: return 2;
602: }
603: #
604: $tableid = &Apache::lonmysql::create_table($student_table_def);
605: if (! defined($tableid)) {
606: &Apache::lonnet::logthis("error creating student_table: ".
607: &Apache::lonmysql::get_error());
608: return 3;
609: }
610: #
611: $tableid = &Apache::lonmysql::create_table($performance_table_def);
612: if (! defined($tableid)) {
613: &Apache::lonnet::logthis("error creating preformance_table: ".
614: &Apache::lonmysql::get_error());
615: return 5;
616: }
617: #
618: $tableid = &Apache::lonmysql::create_table($parameters_table_def);
619: if (! defined($tableid)) {
620: &Apache::lonnet::logthis("error creating parameters_table: ".
621: &Apache::lonmysql::get_error());
622: return 6;
623: }
624: #
625: $tableid = &Apache::lonmysql::create_table($fulldump_part_table_def);
626: if (! defined($tableid)) {
627: &Apache::lonnet::logthis("error creating fulldump_part_table: ".
628: &Apache::lonmysql::get_error());
629: return 7;
630: }
631: #
632: $tableid = &Apache::lonmysql::create_table($fulldump_response_table_def);
633: if (! defined($tableid)) {
634: &Apache::lonnet::logthis("error creating fulldump_response_table: ".
635: &Apache::lonmysql::get_error());
636: return 8;
637: }
638: $tableid = &Apache::lonmysql::create_table($fulldump_timestamp_table_def);
639: if (! defined($tableid)) {
640: &Apache::lonnet::logthis("error creating fulldump_timestamp_table: ".
641: &Apache::lonmysql::get_error());
642: return 9;
643: }
644: $tableid = &Apache::lonmysql::create_table($weight_table_def);
645: if (! defined($tableid)) {
646: &Apache::lonnet::logthis("error creating weight_table: ".
647: &Apache::lonmysql::get_error());
648: return 10;
649: }
650: $tableid = &Apache::lonmysql::create_table($groupnames_table_def);
651: if (! defined($tableid)) {
652: &Apache::lonnet::logthis("error creating groupnames_table: ".
653: &Apache::lonmysql::get_error());
654: return 11;
655: }
656: $tableid = &Apache::lonmysql::create_table($students_groups_table_def);
657: if (! defined($tableid)) {
658: &Apache::lonnet::logthis("error creating student_groups_table: ".
659: &Apache::lonmysql::get_error());
660: return 12;
661: }
662: return 0;
663: }
664:
665: ################################################
666: ################################################
667:
668: =pod
669:
670: =item &delete_caches()
671:
672: This routine drops all the tables associated with a course from the
673: MySQL database.
674:
675: Input: course id (optional, determined by environment if omitted)
676:
677: Returns: nothing
678:
679: =cut
680:
681: ################################################
682: ################################################
683: sub delete_caches {
684: my $courseid = shift;
685: $courseid = $env{'request.course.id'} if (! defined($courseid));
686: #
687: &setup_table_names($courseid);
688: #
689: my $dbh = &Apache::lonmysql::get_dbh();
690: foreach my $table (@Tables) {
691: my $command = 'DROP TABLE '.$table.';';
692: $dbh->do($command);
693: if ($dbh->err) {
694: &Apache::lonnet::logthis($command.' resulted in error: '.$dbh->errstr);
695: }
696: }
697: return;
698: }
699:
700: ################################################
701: ################################################
702:
703: =pod
704:
705: =item &get_part_id()
706:
707: Get the MySQL id of a problem part string.
708:
709: Input: $part
710:
711: Output: undef on error, integer $part_id on success.
712:
713: =item &get_part()
714:
715: Get the string describing a part from the MySQL id of the problem part.
716:
717: Input: $part_id
718:
719: Output: undef on error, $part string on success.
720:
721: =cut
722:
723: ################################################
724: ################################################
725:
726: my $have_read_part_table = 0;
727: my %ids_by_part;
728: my %parts_by_id;
729:
730: sub get_part_id {
731: my ($part) = @_;
732: $part = 0 if (! defined($part));
733: if (! $have_read_part_table) {
734: my @Result = &Apache::lonmysql::get_rows($part_table);
735: foreach (@Result) {
736: $ids_by_part{$_->[1]}=$_->[0];
737: }
738: $have_read_part_table = 1;
739: }
740: if (! exists($ids_by_part{$part})) {
741: &Apache::lonmysql::store_row($part_table,[undef,$part]);
742: undef(%ids_by_part);
743: my @Result = &Apache::lonmysql::get_rows($part_table);
744: foreach (@Result) {
745: $ids_by_part{$_->[1]}=$_->[0];
746: }
747: }
748: return $ids_by_part{$part} if (exists($ids_by_part{$part}));
749: return undef; # error
750: }
751:
752: sub get_part {
753: my ($part_id) = @_;
754: if (! exists($parts_by_id{$part_id}) ||
755: ! defined($parts_by_id{$part_id}) ||
756: $parts_by_id{$part_id} eq '') {
757: my @Result = &Apache::lonmysql::get_rows($part_table);
758: foreach (@Result) {
759: $parts_by_id{$_->[0]}=$_->[1];
760: }
761: }
762: return $parts_by_id{$part_id} if(exists($parts_by_id{$part_id}));
763: return undef; # error
764: }
765:
766: ################################################
767: ################################################
768:
769: =pod
770:
771: =item &get_symb_id()
772:
773: Get the MySQL id of a symb.
774:
775: Input: $symb
776:
777: Output: undef on error, integer $symb_id on success.
778:
779: =item &get_symb()
780:
781: Get the symb associated with a MySQL symb_id.
782:
783: Input: $symb_id
784:
785: Output: undef on error, $symb on success.
786:
787: =cut
788:
789: ################################################
790: ################################################
791:
792: my $have_read_symb_table = 0;
793: my %ids_by_symb;
794: my %symbs_by_id;
795:
796: sub get_symb_id {
797: my ($symb) = @_;
798: if (! $have_read_symb_table) {
799: my @Result = &Apache::lonmysql::get_rows($symb_table);
800: foreach (@Result) {
801: $ids_by_symb{$_->[1]}=$_->[0];
802: }
803: $have_read_symb_table = 1;
804: }
805: if (! exists($ids_by_symb{$symb})) {
806: &Apache::lonmysql::store_row($symb_table,[undef,$symb]);
807: undef(%ids_by_symb);
808: my @Result = &Apache::lonmysql::get_rows($symb_table);
809: foreach (@Result) {
810: $ids_by_symb{$_->[1]}=$_->[0];
811: }
812: }
813: return $ids_by_symb{$symb} if(exists( $ids_by_symb{$symb}));
814: return undef; # error
815: }
816:
817: sub get_symb {
818: my ($symb_id) = @_;
819: if (! exists($symbs_by_id{$symb_id}) ||
820: ! defined($symbs_by_id{$symb_id}) ||
821: $symbs_by_id{$symb_id} eq '') {
822: my @Result = &Apache::lonmysql::get_rows($symb_table);
823: foreach (@Result) {
824: $symbs_by_id{$_->[0]}=$_->[1];
825: }
826: }
827: return $symbs_by_id{$symb_id} if(exists( $symbs_by_id{$symb_id}));
828: return undef; # error
829: }
830:
831: ################################################
832: ################################################
833:
834: =pod
835:
836: =item &get_student_id()
837:
838: Get the MySQL id of a student.
839:
840: Input: $sname, $dom
841:
842: Output: undef on error, integer $student_id on success.
843:
844: =item &get_student()
845:
846: Get student username:domain associated with the MySQL student_id.
847:
848: Input: $student_id
849:
850: Output: undef on error, string $student (username:domain) on success.
851:
852: =cut
853:
854: ################################################
855: ################################################
856:
857: my $have_read_student_table = 0;
858: my %ids_by_student;
859: my %students_by_id;
860:
861: sub get_student_id {
862: my ($sname,$sdom) = @_;
863: my $student = $sname.':'.$sdom;
864: if (! $have_read_student_table) {
865: my @Result = &Apache::lonmysql::get_rows($student_table);
866: foreach (@Result) {
867: $ids_by_student{$_->[1]}=$_->[0];
868: }
869: $have_read_student_table = 1;
870: }
871: if (! exists($ids_by_student{$student})) {
872: &populate_student_table();
873: undef(%ids_by_student);
874: undef(%students_by_id);
875: my @Result = &Apache::lonmysql::get_rows($student_table);
876: foreach (@Result) {
877: $ids_by_student{$_->[1]}=$_->[0];
878: }
879: }
880: return $ids_by_student{$student} if(exists( $ids_by_student{$student}));
881: return undef; # error
882: }
883:
884: sub get_student {
885: my ($student_id) = @_;
886: if (! exists($students_by_id{$student_id}) ||
887: ! defined($students_by_id{$student_id}) ||
888: $students_by_id{$student_id} eq '') {
889: my @Result = &Apache::lonmysql::get_rows($student_table);
890: foreach (@Result) {
891: $students_by_id{$_->[0]}=$_->[1];
892: }
893: }
894: return $students_by_id{$student_id} if(exists($students_by_id{$student_id}));
895: return undef; # error
896: }
897:
898: sub populate_student_table {
899: my ($courseid) = @_;
900: if (! defined($courseid)) {
901: $courseid = $env{'request.course.id'};
902: }
903: #
904: &setup_table_names($courseid);
905: &init_dbs($courseid,0);
906: my $dbh = &Apache::lonmysql::get_dbh();
907: my $request = 'INSERT IGNORE INTO '.$student_table.
908: "(student,section,status) VALUES ";
909: my $cdom = $env{'course.'.$courseid.'.domain'};
910: my $cnum = $env{'course.'.$courseid.'.num'};
911: my $classlist = &get_classlist($cdom,$cnum);
912: my $student_count=0;
913: while (my ($student,$data) = each %$classlist) {
914: my ($section,$status) = ($data->[&CL_SECTION()],
915: $data->[&CL_STATUS()]);
916: if ($section eq '' || $section =~ /^\s*$/) {
917: $section = 'none';
918: }
919: $request .= "('".$student."','".$section."','".$status."'),";
920: $student_count++;
921: }
922: return if ($student_count == 0);
923: chop($request);
924: $dbh->do($request);
925: if ($dbh->err()) {
926: &Apache::lonnet::logthis("error ".$dbh->errstr().
927: " occured executing \n".
928: $request);
929: }
930: return;
931: }
932:
933: my $have_read_groupnames_table = 0;
934: my %ids_by_groupname;
935:
936: sub get_group_id {
937: my ($groupname) = @_;
938: if (! $have_read_groupnames_table) {
939: my @Result = &Apache::lonmysql::get_rows($groupnames_table);
940: foreach (@Result) {
941: $ids_by_groupname{$_->[1]}=$_->[0];
942: }
943: $have_read_groupnames_table = 1;
944: }
945: if (! exists($ids_by_groupname{$groupname})) {
946: &populate_groupnames_table();
947: undef(%ids_by_groupname);
948: my @Result = &Apache::lonmysql::get_rows($groupnames_table);
949: foreach (@Result) {
950: $ids_by_groupname{$_->[1]}=$_->[0];
951: }
952: }
953: if (exists($ids_by_groupname{$groupname})) {
954: return $ids_by_groupname{$groupname};
955: }
956: return undef; # error
957: }
958:
959: sub populate_groupnames_table {
960: my ($courseid) = @_;
961: if (! defined($courseid)) {
962: $courseid = $env{'request.course.id'};
963: }
964: &setup_table_names($courseid);
965: &init_dbs($courseid,0);
966: my $dbh = &Apache::lonmysql::get_dbh();
967: my $cdom = $env{'course.'.$courseid.'.domain'};
968: my $cnum = $env{'course.'.$courseid.'.num'};
969: my %curr_groups = &Apache::longroup::coursegroups($cdom,$cnum);
970: return if (!%curr_groups);
971: my $request = 'INSERT IGNORE INTO '.$groupnames_table.
972: '(groupname) VALUES ';
973: foreach my $groupname (sort(keys(%curr_groups)),'none') {
974: $request .= "('".$groupname."'),";
975: }
976: chop($request);
977: $dbh->do($request);
978: if ($dbh->err()) {
979: &Apache::lonnet::logthis("error ".$dbh->errstr().
980: " occured executing \n".
981: $request);
982: }
983: return;
984: }
985:
986: my $have_read_studentsgroups_table = 0;
987: my %groupids_by_studentid;
988:
989: sub get_students_groupids {
990: my ($student_id) = @_;
991: if (! $have_read_studentsgroups_table) {
992: my @Result = &Apache::lonmysql::get_rows($students_groups_table);
993: foreach (@Result) {
994: push(@{$groupids_by_studentid{$_->[0]}},$_->[1]);
995: }
996: $have_read_studentsgroups_table = 1;
997: }
998: if (! exists($groupids_by_studentid{$student_id})) {
999: &populate_students_groups_table();
1000: undef(%groupids_by_studentid);
1001: my @Result = &Apache::lonmysql::get_rows($students_groups_table);
1002: foreach (@Result) {
1003: push(@{$groupids_by_studentid{$_->[0]}},$_->[1]);
1004: }
1005: }
1006: if (exists($groupids_by_studentid{$student_id})) {
1007: if (ref($groupids_by_studentid{$student_id}) eq 'ARRAY') {
1008: return @{$groupids_by_studentid{$student_id}};
1009: }
1010: }
1011: return undef; # error
1012: }
1013:
1014:
1015: sub populate_students_groups_table {
1016: my ($courseid) = @_;
1017: if (! defined($courseid)) {
1018: $courseid = $env{'request.course.id'};
1019: }
1020: #
1021: &setup_table_names($courseid);
1022: &init_dbs($courseid,0);
1023: my $dbh = &Apache::lonmysql::get_dbh();
1024: my $request = 'INSERT IGNORE INTO '.$students_groups_table.
1025: "(student_id,group_id) VALUES ";
1026: my $cdom = $env{'course.'.$courseid.'.domain'};
1027: my $cnum = $env{'course.'.$courseid.'.num'};
1028: my ($classlist,$keylist) = &get_classlist($cdom,$cnum);
1029: my ($classgroups,$studentgroups) = &get_group_memberships($classlist,
1030: $keylist,
1031: $cdom,$cnum);
1032: my $record_count = 0;
1033: foreach my $student (sort(keys(%{$classgroups}))) {
1034: my $student_id = &get_student_id(split(':',$student));
1035: my @studentsgroups = &get_students_groups($student,'Active',$classgroups);
1036: if (@studentsgroups < 1) {
1037: @studentsgroups = ('none');
1038: }
1039: foreach my $groupname (@studentsgroups) {
1040: my $group_id = &get_group_id($groupname);
1041: $request .= "('".$student_id."','".$group_id."'),";
1042: $record_count++;
1043: }
1044: }
1045: return if ($record_count == 0);
1046: chop($request);
1047: $dbh->do($request);
1048: if ($dbh->err()) {
1049: &Apache::lonnet::logthis("error ".$dbh->errstr().
1050: " occured executing \n".
1051: $request);
1052: }
1053: return;
1054: }
1055:
1056: ################################################
1057: ################################################
1058:
1059: =pod
1060:
1061: =item &clear_internal_caches()
1062:
1063: Causes the internal caches used in get_student_id, get_student,
1064: get_symb_id, get_symb, get_part_id, and get_part to be undef'd.
1065:
1066: Needs to be called before the first operation with the MySQL database
1067: for a given Apache request.
1068:
1069: =cut
1070:
1071: ################################################
1072: ################################################
1073: sub clear_internal_caches {
1074: $have_read_part_table = 0;
1075: undef(%ids_by_part);
1076: undef(%parts_by_id);
1077: $have_read_symb_table = 0;
1078: undef(%ids_by_symb);
1079: undef(%symbs_by_id);
1080: $have_read_student_table = 0;
1081: undef(%ids_by_student);
1082: undef(%students_by_id);
1083: $have_read_groupnames_table = 0;
1084: undef(%ids_by_groupname);
1085: }
1086:
1087:
1088: ################################################
1089: ################################################
1090:
1091: sub symb_is_for_task {
1092: my ($symb) = @_;
1093: return ($symb =~ /\.task$/);
1094: }
1095:
1096: ################################################
1097: ################################################
1098:
1099: =pod
1100:
1101: =item &update_full_student_data($sname,$sdom,$courseid)
1102:
1103: Does a lonnet::dump on a student to populate the courses tables.
1104:
1105: Input: $sname, $sdom, $courseid
1106:
1107: Output: $returnstatus
1108:
1109: $returnstatus is a string describing any errors that occured. 'okay' is the
1110: default.
1111:
1112: This subroutine loads a students data using lonnet::dump and inserts
1113: it into the MySQL database. The inserts are done on three tables,
1114: $fulldump_response_table, $fulldump_part_table, and $fulldump_timestamp_table.
1115: The INSERT calls are made directly by this subroutine, not through lonmysql
1116: because we do a 'bulk'insert which takes advantage of MySQLs non-SQL
1117: compliant INSERT command to insert multiple rows at a time.
1118: If anything has gone wrong during this process, $returnstatus is updated with
1119: a description of the error.
1120:
1121: Once the "fulldump" tables are updated, the tables used for chart and
1122: spreadsheet (which hold only the current state of the student on their
1123: homework, not historical data) are updated. If all updates have occured
1124: successfully, $student_table is updated to reflect the time of the update.
1125:
1126: Notice we do not insert the data and immediately query it. This means it
1127: is possible for there to be data returned this first time that is not
1128: available the second time. CYA.
1129:
1130: =cut
1131:
1132: ################################################
1133: ################################################
1134: sub update_full_student_data {
1135: my ($sname,$sdom,$courseid) = @_;
1136: #
1137: # Set up database names
1138: &setup_table_names($courseid);
1139: #
1140: my $student_id = &get_student_id($sname,$sdom);
1141: my @group_ids = &get_students_groupids($student_id);
1142: my $student = $sname.':'.$sdom;
1143: #
1144: my $returnstatus = 'okay';
1145: #
1146: # Download students data
1147: my $time_of_retrieval = time;
1148: my @tmp = &Apache::lonnet::dumpstore($courseid,$sdom,$sname);
1149: if (@tmp && $tmp[0] =~ /^error/) {
1150: $returnstatus = 'error retrieving full student data';
1151: return $returnstatus;
1152: } elsif (! @tmp) {
1153: $returnstatus = 'okay: no student data';
1154: return $returnstatus;
1155: }
1156: my %studentdata = @tmp;
1157: #
1158: # Get database handle and clean out the tables
1159: my $dbh = &Apache::lonmysql::get_dbh();
1160: $dbh->do('DELETE FROM '.$fulldump_response_table.' WHERE student_id='.
1161: $student_id);
1162: $dbh->do('DELETE FROM '.$fulldump_part_table.' WHERE student_id='.
1163: $student_id);
1164: $dbh->do('DELETE FROM '.$fulldump_timestamp_table.' WHERE student_id='.
1165: $student_id);
1166: #
1167: # Parse and store the data into a form we can handle
1168: my $partdata;
1169: my $respdata;
1170: while (my ($key,$value) = each(%studentdata)) {
1171: next if ($key =~ /^(\d+):(resource$|subnum$|keys:)/);
1172: my ($transaction,$symb,$parameter) = split(':',$key);
1173: my $symb_id = &get_symb_id($symb);
1174: if ($parameter eq 'timestamp') {
1175: # We can deal with 'timestamp' right away
1176: my @timestamp_storage = ($symb_id,$student_id,
1177: $transaction,$value);
1178: my $store_command = 'INSERT IGNORE INTO '.$fulldump_timestamp_table.
1179: " VALUES ('".join("','",@timestamp_storage)."');";
1180: $dbh->do($store_command);
1181: if ($dbh->err()) {
1182: &Apache::lonnet::logthis('unable to execute '.$store_command);
1183: &Apache::lonnet::logthis($dbh->errstr());
1184: }
1185: next;
1186: } elsif ($parameter eq 'version') {
1187: next;
1188: } elsif (&symb_is_for_task($symb)) {
1189: next if ($parameter !~ /^resource\.(.*)\.(award|
1190: awarded|
1191: solved|
1192: submission|
1193: portfiles|
1194: status|
1195: version|
1196: regrader)\s*$/x);
1197: my ($version_and_part_id, $field) = ($1,$2);
1198:
1199: next if ($version_and_part_id !~ /\./
1200: && $field ne 'regrader' && $field ne 'version');
1201:
1202: my ($version, $part, $instance) =
1203: split(/\./,$version_and_part_id);
1204:
1205: #skip and instance dimension or criteria specific data
1206: next if (defined($instance)
1207: && $instance ne $field
1208: && $instance ne 'bridgetask');
1209:
1210: if (!defined($part)) {
1211: $part = $version;
1212: }
1213: my $resp_id = &get_part_id('0');
1214: my $part_id = &get_part_id($part);
1215:
1216: if ($field eq 'version') {
1217: # for tasks each version is an attempt at it thus
1218: # version -> tries
1219: $partdata->{$symb_id}{$part_id}{$transaction}{'tries'}=
1220: $value;
1221: # at new version time the record gets reset thus adding a
1222: # virtual response awarddetail of 'new_version'
1223: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific'}='status';
1224: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific_value'}='new_version';
1225:
1226: } elsif ($field eq 'award' || $field eq 'awarded'
1227: || $field eq 'solved') {
1228: $partdata->{$symb_id}{$part_id}{$transaction}{$field}=
1229: $value;
1230: } elsif ($field eq 'portfiles') {
1231: # tasks only accepts portfolio submissions
1232: $value = $dbh->quote($value);
1233: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'submission'}=$value;
1234: } elsif ($field eq 'status') {
1235: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific'}=$field;
1236: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific_value'}=$value;
1237: } elsif ($field eq 'regrader') {
1238: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific_2'}=$field;
1239: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific_value_2'}=$value;
1240: }
1241: } elsif ($parameter =~ /^resource\.(.*)\.(tries|
1242: award|
1243: awarded|
1244: previous|
1245: solved|
1246: awarddetail|
1247: submission|
1248: submissiongrading|
1249: molecule)\s*$/x){
1250: # we do not have enough information to store an
1251: # entire row, so we save it up until later.
1252: my ($part_and_resp_id,$field) = ($1,$2);
1253: my ($part,$part_id,$resp,$resp_id);
1254: if ($part_and_resp_id =~ /\./) {
1255: ($part,$resp) = split(/\./,$part_and_resp_id);
1256: $part_id = &get_part_id($part);
1257: $resp_id = &get_part_id($resp);
1258: } else {
1259: $part_id = &get_part_id($part_and_resp_id);
1260: }
1261: # Deal with part specific data
1262: if ($field =~ /^(tries|award|awarded|previous)$/) {
1263: $partdata->{$symb_id}->{$part_id}->{$transaction}->{$field}=$value;
1264: }
1265: # deal with response specific data
1266: if (defined($resp_id) &&
1267: $field =~ /^(awarddetail|
1268: submission|
1269: submissiongrading|
1270: molecule)$/x) {
1271: if ($field eq 'submission') {
1272: # We have to be careful with user supplied input.
1273: # most of the time we are okay because it is escaped.
1274: # However, there is one wrinkle: submissions which end in
1275: # and odd number of '\' cause insert errors to occur.
1276: # Best trap this somehow...
1277: $value = $dbh->quote($value);
1278: }
1279: if ($field eq 'submissiongrading' ||
1280: $field eq 'molecule') {
1281: $respdata->{$symb_id}->{$part_id}->{$resp_id}->{$transaction}->{'response_specific'}=$field;
1282: $respdata->{$symb_id}->{$part_id}->{$resp_id}->{$transaction}->{'response_specific_value'}=$value;
1283: } else {
1284: $respdata->{$symb_id}->{$part_id}->{$resp_id}->{$transaction}->{$field}=$value;
1285: }
1286: }
1287: }
1288: }
1289: ##
1290: ## Store the part data
1291: my $store_command = 'INSERT IGNORE INTO '.$fulldump_part_table.
1292: ' VALUES '."\n";
1293: my $store_rows = 0;
1294: while (my ($symb_id,$hash1) = each (%$partdata)) {
1295: while (my ($part_id,$hash2) = each (%$hash1)) {
1296: while (my ($transaction,$data) = each (%$hash2)) {
1297: $store_command .= "('".join("','",$symb_id,$part_id,
1298: $student_id,
1299: $transaction,
1300: $data->{'tries'},
1301: $data->{'award'},
1302: $data->{'awarded'},
1303: $data->{'previous'})."'),";
1304: $store_rows++;
1305: }
1306: }
1307: }
1308: if ($store_rows) {
1309: chop($store_command);
1310: $dbh->do($store_command);
1311: if ($dbh->err) {
1312: $returnstatus = 'error storing part data';
1313: &Apache::lonnet::logthis('insert error '.$dbh->errstr());
1314: &Apache::lonnet::logthis("While attempting\n".$store_command);
1315: }
1316: }
1317: ##
1318: ## Store the response data
1319: $store_command = 'INSERT IGNORE INTO '.$fulldump_response_table.
1320: ' VALUES '."\n";
1321: $store_rows = 0;
1322: while (my ($symb_id,$hash1) = each (%$respdata)) {
1323: while (my ($part_id,$hash2) = each (%$hash1)) {
1324: while (my ($resp_id,$hash3) = each (%$hash2)) {
1325: while (my ($transaction,$data) = each (%$hash3)) {
1326: my $submission = $data->{'submission'};
1327: # We have to be careful with user supplied input.
1328: # most of the time we are okay because it is escaped.
1329: # However, there is one wrinkle: submissions which end in
1330: # and odd number of '\' cause insert errors to occur.
1331: # Best trap this somehow...
1332: $submission = $dbh->quote($submission);
1333: $store_command .= "('".
1334: join("','",$symb_id,$part_id,
1335: $resp_id,$student_id,
1336: $transaction,
1337: $data->{'awarddetail'},
1338: $data->{'response_specific'},
1339: $data->{'response_specific_value'},
1340: $data->{'response_specific_2'},
1341: $data->{'response_specific_value_2'}).
1342: "',".$submission."),";
1343: $store_rows++;
1344: }
1345: }
1346: }
1347: }
1348: if ($store_rows) {
1349: chop($store_command);
1350: $dbh->do($store_command);
1351: if ($dbh->err) {
1352: $returnstatus = 'error storing response data';
1353: &Apache::lonnet::logthis('insert error '.$dbh->errstr());
1354: &Apache::lonnet::logthis("While attempting\n".$store_command);
1355: }
1356: }
1357: ##
1358: ## Update the students "current" data in the performance
1359: ## and parameters tables.
1360: my ($status,undef) = &store_student_data
1361: ($sname,$sdom,$courseid,
1362: &Apache::lonnet::convert_dump_to_currentdump(\%studentdata));
1363: if ($returnstatus eq 'okay' && $status ne 'okay') {
1364: $returnstatus = 'error storing current data:'.$status;
1365: } elsif ($status ne 'okay') {
1366: $returnstatus .= ' error storing current data:'.$status;
1367: }
1368: ##
1369: ## Update the students time......
1370: if ($returnstatus eq 'okay') {
1371: &store_updatetime($student_id,$time_of_retrieval,$time_of_retrieval);
1372: if ($dbh->err) {
1373: if ($returnstatus eq 'okay') {
1374: $returnstatus = 'error updating student time';
1375: } else {
1376: $returnstatus = 'error updating student time';
1377: }
1378: }
1379: }
1380: return $returnstatus;
1381: }
1382:
1383: ################################################
1384: ################################################
1385:
1386: =pod
1387:
1388: =item &update_student_data()
1389:
1390: Input: $sname, $sdom, $courseid
1391:
1392: Output: $returnstatus, \%student_data
1393:
1394: $returnstatus is a string describing any errors that occured. 'okay' is the
1395: default.
1396: \%student_data is the data returned by a call to lonnet::currentdump.
1397:
1398: This subroutine loads a students data using lonnet::currentdump and inserts
1399: it into the MySQL database. The inserts are done on two tables,
1400: $performance_table and $parameters_table. $parameters_table holds the data
1401: that is not included in $performance_table. See the description of
1402: $performance_table elsewhere in this file. The INSERT calls are made
1403: directly by this subroutine, not through lonmysql because we do a 'bulk'
1404: insert which takes advantage of MySQLs non-SQL compliant INSERT command to
1405: insert multiple rows at a time. If anything has gone wrong during this
1406: process, $returnstatus is updated with a description of the error and
1407: \%student_data is returned.
1408:
1409: Notice we do not insert the data and immediately query it. This means it
1410: is possible for there to be data returned this first time that is not
1411: available the second time. CYA.
1412:
1413: =cut
1414:
1415: ################################################
1416: ################################################
1417: sub update_student_data {
1418: my ($sname,$sdom,$courseid) = @_;
1419: #
1420: # Set up database names
1421: &setup_table_names($courseid);
1422: #
1423: my $student_id = &get_student_id($sname,$sdom);
1424: my @group_ids = &get_students_groupids($student_id);
1425: my $student = $sname.':'.$sdom;
1426: #
1427: my $returnstatus = 'okay';
1428: #
1429: # Download students data
1430: my $time_of_retrieval = time;
1431: my @tmp = &Apache::lonnet::currentdump($courseid,$sdom,$sname);
1432: if ((scalar(@tmp) > 0) && ($tmp[0] =~ /^error:/)) {
1433: &Apache::lonnet::logthis('error getting data for '.
1434: $sname.':'.$sdom.' in course '.$courseid.
1435: ':'.$tmp[0]);
1436: $returnstatus = 'error getting data';
1437: return ($returnstatus,undef);
1438: }
1439: if (scalar(@tmp) < 1) {
1440: return ('no data',undef);
1441: }
1442: my %student_data = @tmp;
1443: my @Results = &store_student_data($sname,$sdom,$courseid,\%student_data);
1444: #
1445: # Set the students update time
1446: if ($Results[0] eq 'okay') {
1447: &store_updatetime($student_id,$time_of_retrieval);
1448: }
1449: #
1450: return @Results;
1451: }
1452:
1453: sub store_updatetime {
1454: my ($student_id,$updatetime,$fullupdatetime)=@_;
1455: my $values = '';
1456: if (defined($updatetime)) {
1457: $values = 'updatetime='.$updatetime.' ';
1458: }
1459: if (defined($fullupdatetime)) {
1460: if ($values ne '') {
1461: $values .= ',';
1462: }
1463: $values .= 'fullupdatetime='.$fullupdatetime.' ';
1464: }
1465: return if ($values eq '');
1466: my $dbh = &Apache::lonmysql::get_dbh();
1467: my $request = 'UPDATE '.$student_table.' SET '.$values.
1468: ' WHERE student_id='.$student_id.' LIMIT 1';
1469: $dbh->do($request);
1470: }
1471:
1472: sub store_student_data {
1473: my ($sname,$sdom,$courseid,$student_data) = @_;
1474: #
1475: my $student_id = &get_student_id($sname,$sdom);
1476: my @group_ids = &get_students_groupids($student_id);
1477: my $student = $sname.':'.$sdom;
1478: #
1479: my $returnstatus = 'okay';
1480: #
1481: # Remove all of the students data from the table
1482: my $dbh = &Apache::lonmysql::get_dbh();
1483: $dbh->do('DELETE FROM '.$performance_table.' WHERE student_id='.
1484: $student_id);
1485: $dbh->do('DELETE FROM '.$parameters_table.' WHERE student_id='.
1486: $student_id);
1487: #
1488: # Store away the data
1489: #
1490: my $starttime = Time::HiRes::time;
1491: my $elapsed = 0;
1492: my $rows_stored;
1493: my $store_parameters_command = 'INSERT IGNORE INTO '.$parameters_table.
1494: ' VALUES '."\n";
1495: my $num_parameters = 0;
1496: my $store_performance_command = 'INSERT IGNORE INTO '.$performance_table.
1497: ' VALUES '."\n";
1498: return ('error',undef) if (! defined($dbh));
1499: while (my ($current_symb,$param_hash) = each(%{$student_data})) {
1500: #
1501: # make sure the symb is set up properly
1502: my $symb_id = &get_symb_id($current_symb);
1503: #
1504: # Parameters
1505: while (my ($parameter,$value) = each(%$param_hash)) {
1506: if ($parameter !~ /(timestamp|resource\.(.*)\.(solved|tries|awarded|award|awarddetail|previous))/) {
1507: my $sql_parameter = "('".join("','",
1508: $symb_id,$student_id,
1509: $parameter)."',".
1510: $dbh->quote($value)."),\n";
1511: $num_parameters ++;
1512: if ($sql_parameter !~ /''/) {
1513: $store_parameters_command .= $sql_parameter;
1514: #$rows_stored++;
1515: }
1516: }
1517: }
1518: # Performance
1519: my %stored;
1520: while (my ($parameter,$value) = each(%$param_hash)) {
1521: next if ($parameter !~ /^resource\.(.*)\.(solved|awarded)$/);
1522: my $part = $1;
1523: my $which = $2;
1524: next if ($part =~ /\./);
1525: next if (exists($stored{$part}));
1526: $stored{$part}++;
1527: #
1528: my $part_id = &get_part_id($part);
1529: next if (!defined($part_id));
1530:
1531: my ($solved,$awarded);
1532: if ($which eq 'solved') {
1533: $solved = $value;
1534: $awarded = $param_hash->{'resource.'.$part.'.awarded'};
1535: } else {
1536: $solved = $param_hash->{'resource.'.$part.'.solved'};
1537: $awarded = $value;
1538: }
1539: my $award = $param_hash->{'resource.'.$part.'.award'};
1540: my $awarddetail = $param_hash->{'resource.'.$part.'.awarddetail'};
1541: my $timestamp = $param_hash->{'timestamp'};
1542: my $tries = $param_hash->{'resource.'.$part.'.tries'};
1543: if (&symb_is_for_task($current_symb)) {
1544: $tries = $param_hash->{'resource.'.$part.'.version'};
1545: }
1546: #
1547: $solved = '' if (! defined($solved));
1548: $tries = '' if (! defined($tries));
1549: $awarded = '' if (! defined($awarded));
1550: $award = '' if (! defined($award));
1551: $awarddetail = '' if (! defined($awarddetail));
1552: my $sql_performance =
1553: "('".join("','",$symb_id,$student_id,$part_id,$part,
1554: $solved,$tries,$awarded,$award,
1555: $awarddetail,$timestamp)."'),\n";
1556: $store_performance_command .= $sql_performance;
1557: $rows_stored++;
1558: }
1559: }
1560: if (! $rows_stored) { return ($returnstatus, undef); }
1561: $store_parameters_command =~ s|,\n$||;
1562: $store_performance_command =~ s|,\n$||;
1563: my $start = Time::HiRes::time;
1564: $dbh->do($store_performance_command);
1565: if ($dbh->err()) {
1566: &Apache::lonnet::logthis('performance bigass insert error:'.
1567: $dbh->errstr());
1568: &Apache::lonnet::logthis('command = '.$/.$store_performance_command);
1569: $returnstatus = 'error: unable to insert performance into database';
1570: return ($returnstatus,$student_data);
1571: }
1572: $dbh->do($store_parameters_command) if ($num_parameters>0);
1573: if ($dbh->err()) {
1574: &Apache::lonnet::logthis('parameters bigass insert error:'.
1575: $dbh->errstr());
1576: &Apache::lonnet::logthis('command = '.$/.$store_parameters_command);
1577: &Apache::lonnet::logthis('rows_stored = '.$rows_stored);
1578: &Apache::lonnet::logthis('student_id = '.$student_id);
1579: $returnstatus = 'error: unable to insert parameters into database';
1580: return ($returnstatus,$student_data);
1581: }
1582: $elapsed += Time::HiRes::time - $start;
1583: return ($returnstatus,$student_data);
1584: }
1585:
1586: ######################################
1587: ######################################
1588:
1589: =pod
1590:
1591: =item &ensure_tables_are_set_up($courseid)
1592:
1593: Checks to be sure the MySQL tables for the given class are set up.
1594: If $courseid is omitted it will be obtained from the environment.
1595:
1596: Returns nothing on success and 'error' on failure
1597:
1598: =cut
1599:
1600: ######################################
1601: ######################################
1602: sub ensure_tables_are_set_up {
1603: my ($courseid) = @_;
1604: $courseid = $env{'request.course.id'} if (! defined($courseid));
1605: #
1606: # Clean out package variables
1607: &setup_table_names($courseid);
1608: #
1609: # if the tables do not exist, make them
1610: my @CurrentTable = &Apache::lonmysql::tables_in_db();
1611: my ($found_symb,$found_student,$found_groups,$found_groupnames,$found_part,
1612: $found_performance,$found_parameters,$found_fulldump_part,
1613: $found_fulldump_response,$found_fulldump_timestamp,
1614: $found_weight);
1615: foreach (@CurrentTable) {
1616: $found_symb = 1 if ($_ eq $symb_table);
1617: $found_student = 1 if ($_ eq $student_table);
1618: $found_groups = 1 if ($_ eq $students_groups_table);
1619: $found_groupnames = 1 if ($_ eq $groupnames_table);
1620: $found_part = 1 if ($_ eq $part_table);
1621: $found_performance = 1 if ($_ eq $performance_table);
1622: $found_parameters = 1 if ($_ eq $parameters_table);
1623: $found_fulldump_part = 1 if ($_ eq $fulldump_part_table);
1624: $found_fulldump_response = 1 if ($_ eq $fulldump_response_table);
1625: $found_fulldump_timestamp = 1 if ($_ eq $fulldump_timestamp_table);
1626: $found_weight = 1 if ($_ eq $weight_table);
1627: }
1628: if (!$found_symb ||
1629: !$found_student || !$found_part ||
1630: !$found_performance || !$found_parameters ||
1631: !$found_fulldump_part || !$found_fulldump_response ||
1632: !$found_fulldump_timestamp || !$found_weight ) {
1633: if (&init_dbs($courseid,1)) {
1634: return 'error';
1635: }
1636: }
1637: }
1638:
1639: ################################################
1640: ################################################
1641:
1642: =pod
1643:
1644: =item &ensure_current_data()
1645:
1646: Input: $sname, $sdom, $courseid
1647:
1648: Output: $status, $data
1649:
1650: This routine ensures the data for a given student is up to date.
1651: The $student_table is queried to determine the time of the last update.
1652: If the students data is out of date, &update_student_data() is called.
1653: The return values from the call to &update_student_data() are returned.
1654:
1655: =cut
1656:
1657: ################################################
1658: ################################################
1659: sub ensure_current_data {
1660: my ($sname,$sdom,$courseid) = @_;
1661: my $status = 'okay'; # return value
1662: #
1663: $courseid = $env{'request.course.id'} if (! defined($courseid));
1664: &ensure_tables_are_set_up($courseid);
1665: #
1666: # Get the update time for the user
1667: my $updatetime = 0;
1668: my $modifiedtime = &Apache::lonnet::GetFileTimestamp
1669: ($sdom,$sname,$courseid.'.db',
1670: $Apache::lonnet::perlvar{'lonUsersDir'});
1671: #
1672: my $student_id = &get_student_id($sname,$sdom);
1673: my @group_ids = &get_students_groupids($student_id);
1674: my @Result = &Apache::lonmysql::get_rows($student_table,
1675: "student_id ='$student_id'");
1676: my $data = undef;
1677: if (@Result) {
1678: $updatetime = $Result[0]->[5]; # Ack! This is dumb!
1679: }
1680: if ($modifiedtime > $updatetime) {
1681: ($status,$data) = &update_student_data($sname,$sdom,$courseid);
1682: }
1683: return ($status,$data);
1684: }
1685:
1686: ################################################
1687: ################################################
1688:
1689: =pod
1690:
1691: =item &ensure_current_full_data($sname,$sdom,$courseid)
1692:
1693: Input: $sname, $sdom, $courseid
1694:
1695: Output: $status
1696:
1697: This routine ensures the fulldata (the data from a lonnet::dump, not a
1698: lonnet::currentdump) for a given student is up to date.
1699: The $student_table is queried to determine the time of the last update.
1700: If the students fulldata is out of date, &update_full_student_data() is
1701: called.
1702:
1703: The return value from the call to &update_full_student_data() is returned.
1704:
1705: =cut
1706:
1707: ################################################
1708: ################################################
1709: sub ensure_current_full_data {
1710: my ($sname,$sdom,$courseid) = @_;
1711: my $status = 'okay'; # return value
1712: #
1713: $courseid = $env{'request.course.id'} if (! defined($courseid));
1714: &ensure_tables_are_set_up($courseid);
1715: #
1716: # Get the update time for the user
1717: my $modifiedtime = &Apache::lonnet::GetFileTimestamp
1718: ($sdom,$sname,$courseid.'.db',
1719: $Apache::lonnet::perlvar{'lonUsersDir'});
1720: #
1721: my $student_id = &get_student_id($sname,$sdom);
1722: my @group_ids = &get_students_groupids($student_id);
1723: my @Result = &Apache::lonmysql::get_rows($student_table,
1724: "student_id ='$student_id'");
1725: my $updatetime;
1726: if (@Result && ref($Result[0]) eq 'ARRAY') {
1727: $updatetime = $Result[0]->[6];
1728: }
1729: if (! defined($updatetime) || $modifiedtime > $updatetime) {
1730: $status = &update_full_student_data($sname,$sdom,$courseid);
1731: }
1732: return $status;
1733: }
1734:
1735: ################################################
1736: ################################################
1737:
1738: =pod
1739:
1740: =item &get_student_data_from_performance_cache()
1741:
1742: Input: $sname, $sdom, $symb, $courseid
1743:
1744: Output: hash reference containing the data for the given student.
1745: If $symb is undef, all the students data is returned.
1746:
1747: This routine is the heart of the local caching system. See the description
1748: of $performance_table, $symb_table, $student_table, and $part_table. The
1749: main task is building the MySQL request. The tables appear in the request
1750: in the order in which they should be parsed by MySQL. When searching
1751: on a student the $student_table is used to locate the 'student_id'. All
1752: rows in $performance_table which have a matching 'student_id' are returned,
1753: with data from $part_table and $symb_table which match the entries in
1754: $performance_table, 'part_id' and 'symb_id'. When searching on a symb,
1755: the $symb_table is processed first, with matching rows grabbed from
1756: $performance_table and filled in from $part_table and $student_table in
1757: that order.
1758:
1759: Running 'EXPLAIN ' on the 'SELECT' statements generated can be quite
1760: interesting, especially if you play with the order the tables are listed.
1761:
1762: =cut
1763:
1764: ################################################
1765: ################################################
1766: sub get_student_data_from_performance_cache {
1767: my ($sname,$sdom,$symb,$courseid)=@_;
1768: my $student = $sname.':'.$sdom if (defined($sname) && defined($sdom));
1769: &setup_table_names($courseid);
1770: #
1771: # Return hash
1772: my $studentdata;
1773: #
1774: my $dbh = &Apache::lonmysql::get_dbh();
1775: my $request = "SELECT ".
1776: "d.symb,a.part,a.solved,a.tries,a.awarded,a.award,a.awarddetail,".
1777: "a.timestamp ";
1778: if (defined($student)) {
1779: $request .= "FROM $student_table AS b ".
1780: "LEFT JOIN $performance_table AS a ON b.student_id=a.student_id ".
1781: # "LEFT JOIN $part_table AS c ON c.part_id = a.part_id ".
1782: "LEFT JOIN $symb_table AS d ON d.symb_id = a.symb_id ".
1783: "WHERE student='$student'";
1784: if (defined($symb) && $symb ne '') {
1785: $request .= " AND d.symb=".$dbh->quote($symb);
1786: }
1787: } elsif (defined($symb) && $symb ne '') {
1788: $request .= "FROM $symb_table as d ".
1789: "LEFT JOIN $performance_table AS a ON d.symb_id=a.symb_id ".
1790: # "LEFT JOIN $part_table AS c ON c.part_id = a.part_id ".
1791: "LEFT JOIN $student_table AS b ON b.student_id = a.student_id ".
1792: "WHERE symb='".$dbh->quote($symb)."'";
1793: }
1794: my $starttime = Time::HiRes::time;
1795: my $rows_retrieved = 0;
1796: my $sth = $dbh->prepare($request);
1797: $sth->execute();
1798: if ($sth->err()) {
1799: &Apache::lonnet::logthis("Unable to execute MySQL request:");
1800: &Apache::lonnet::logthis("\n".$request."\n");
1801: &Apache::lonnet::logthis("error is:".$sth->errstr());
1802: return undef;
1803: }
1804: foreach my $row (@{$sth->fetchall_arrayref}) {
1805: $rows_retrieved++;
1806: my ($symb,$part,$solved,$tries,$awarded,$award,$awarddetail,$time) =
1807: (@$row);
1808: my $base = 'resource.'.$part;
1809: $studentdata->{$symb}->{$base.'.solved'} = $solved;
1810: $studentdata->{$symb}->{$base.'.tries'} = $tries;
1811: $studentdata->{$symb}->{$base.'.awarded'} = $awarded;
1812: $studentdata->{$symb}->{$base.'.award'} = $award;
1813: $studentdata->{$symb}->{$base.'.awarddetail'} = $awarddetail;
1814: $studentdata->{$symb}->{'timestamp'} = $time if (defined($time) && $time ne '');
1815: }
1816: ## Get misc parameters
1817: $request = 'SELECT c.symb,a.parameter,a.value '.
1818: "FROM $student_table AS b ".
1819: "LEFT JOIN $parameters_table AS a ON b.student_id=a.student_id ".
1820: "LEFT JOIN $symb_table AS c ON c.symb_id = a.symb_id ".
1821: "WHERE student='$student'";
1822: if (defined($symb) && $symb ne '') {
1823: $request .= " AND c.symb=".$dbh->quote($symb);
1824: }
1825: $sth = $dbh->prepare($request);
1826: $sth->execute();
1827: if ($sth->err()) {
1828: &Apache::lonnet::logthis("Unable to execute MySQL request:");
1829: &Apache::lonnet::logthis("\n".$request."\n");
1830: &Apache::lonnet::logthis("error is:".$sth->errstr());
1831: if (defined($symb) && $symb ne '') {
1832: $studentdata = $studentdata->{$symb};
1833: }
1834: return $studentdata;
1835: }
1836: #
1837: foreach my $row (@{$sth->fetchall_arrayref}) {
1838: $rows_retrieved++;
1839: my ($symb,$parameter,$value) = (@$row);
1840: $studentdata->{$symb}->{$parameter} = $value;
1841: }
1842: #
1843: if (defined($symb) && $symb ne '') {
1844: $studentdata = $studentdata->{$symb};
1845: }
1846: return $studentdata;
1847: }
1848:
1849: ################################################
1850: ################################################
1851:
1852: =pod
1853:
1854: =item &get_current_state()
1855:
1856: Input: $sname,$sdom,$symb,$courseid
1857:
1858: Output: Described below
1859:
1860: Retrieve the current status of a students performance. $sname and
1861: $sdom are the only required parameters. If $symb is undef the results
1862: of an &Apache::lonnet::currentdump() will be returned.
1863: If $courseid is undef it will be retrieved from the environment.
1864:
1865: The return structure is based on &Apache::lonnet::currentdump. If
1866: $symb is unspecified, all the students data is returned in a hash of
1867: the form:
1868: (
1869: symb1 => { param1 => value1, param2 => value2 ... },
1870: symb2 => { param1 => value1, param2 => value2 ... },
1871: )
1872:
1873: If $symb is specified, a hash of
1874: (
1875: param1 => value1,
1876: param2 => value2,
1877: )
1878: is returned.
1879:
1880: If no data is found for $symb, or if the student has no performance data,
1881: an empty list is returned.
1882:
1883: =cut
1884:
1885: ################################################
1886: ################################################
1887: sub get_current_state {
1888: my ($sname,$sdom,$symb,$courseid,$forcedownload)=@_;
1889: #
1890: $courseid = $env{'request.course.id'} if (! defined($courseid));
1891: #
1892: return () if (! defined($sname) || ! defined($sdom));
1893: #
1894: my ($status,$data) = &ensure_current_data($sname,$sdom,$courseid);
1895: # &Apache::lonnet::logthis
1896: # ('sname = '.$sname.
1897: # ' domain = '.$sdom.
1898: # ' status = '.$status.
1899: # ' data is '.(defined($data)?'defined':'undefined'));
1900: # while (my ($symb,$hash) = each(%$data)) {
1901: # &Apache::lonnet::logthis($symb."\n----------------------------------");
1902: # while (my ($key,$value) = each (%$hash)) {
1903: # &Apache::lonnet::logthis(" ".$key." = ".$value);
1904: # }
1905: # }
1906: #
1907: if (defined($data) && defined($symb) && ref($data->{$symb})) {
1908: return %{$data->{$symb}};
1909: } elsif (defined($data) && ! defined($symb) && ref($data)) {
1910: return %$data;
1911: }
1912: if ($status eq 'no data') {
1913: return ();
1914: } else {
1915: if ($status ne 'okay' && $status ne '') {
1916: &Apache::lonnet::logthis('status = '.$status);
1917: return ();
1918: }
1919: my $returnhash = &get_student_data_from_performance_cache($sname,$sdom,
1920: $symb,$courseid);
1921: return %$returnhash if (defined($returnhash));
1922: }
1923: return ();
1924: }
1925:
1926: ################################################
1927: ################################################
1928:
1929: =pod
1930:
1931: =item &get_problem_statistics()
1932:
1933: Gather data on a given problem. The database is assumed to be
1934: populated and all local caching variables are assumed to be set
1935: properly. This means you need to call &ensure_current_data for
1936: the students you are concerned with prior to calling this routine.
1937:
1938: Inputs: $Sections, Groups, $status, $symb, $part, $courseid, $starttime,
1939: $endtime
1940:
1941: =over 4
1942:
1943: =item $Sections Array ref containing section names for students.
1944: 'all' is allowed to be the first (and only) item in the array.
1945:
1946: =item $Groups Array ref containing group names for students.
1947: 'all' is allowed to be the first (and only) item in the array.
1948:
1949: =item $status String describing the status of students
1950:
1951: =item $symb is the symb for the problem.
1952:
1953: =item $part is the part id you need statistics for
1954:
1955: =item $courseid is the course id, of course!
1956:
1957: =item $starttime and $endtime are unix times which to use to limit
1958: the statistical data.
1959:
1960: =back
1961:
1962: Outputs: See the code for up to date information. A hash reference is
1963: returned. The hash has the following keys defined:
1964:
1965: =over 4
1966:
1967: =item num_students The number of students attempting the problem
1968:
1969: =item tries The total number of tries for the students
1970:
1971: =item max_tries The maximum number of tries taken
1972:
1973: =item mean_tries The average number of tries
1974:
1975: =item num_solved The number of students able to solve the problem
1976:
1977: =item num_override The number of students whose answer is 'correct_by_override'
1978:
1979: =item deg_of_diff The degree of difficulty of the problem
1980:
1981: =item std_tries The standard deviation of the number of tries
1982:
1983: =item skew_tries The skew of the number of tries
1984:
1985: =item per_wrong The number of students attempting the problem who were not
1986: able to answer it correctly.
1987:
1988: =back
1989:
1990: =cut
1991:
1992: ################################################
1993: ################################################
1994: sub get_problem_statistics {
1995: my ($Sections,$Groups,$status,$symb,$part,$courseid,$starttime,$endtime) = @_;
1996: return if (! defined($symb) || ! defined($part));
1997: $courseid = $env{'request.course.id'} if (! defined($courseid));
1998: #
1999: &setup_table_names($courseid);
2000: my $symb_id = &get_symb_id($symb);
2001: my $part_id = &get_part_id($part);
2002: my $stats_table = $courseid.'_problem_stats';
2003: #
2004: my $dbh = &Apache::lonmysql::get_dbh();
2005: return undef if (! defined($dbh));
2006: #
2007: # Clean out the table
2008: $dbh->do('DROP TABLE '.$stats_table); # May return an error
2009: my $request =
2010: 'CREATE TEMPORARY TABLE '.$stats_table.' '.
2011: 'SELECT a.student_id,a.solved,a.award,a.awarded,a.tries '.
2012: 'FROM '.$performance_table.' AS a ';
2013: #
2014: # See if we need to include some requirements on the students
2015: if ((defined($Sections) && lc($Sections->[0]) ne 'all') ||
2016: (defined($status) && lc($status) ne 'any')) {
2017: $request .= 'NATURAL LEFT JOIN '.$student_table.' AS b ';
2018: }
2019: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
2020: if (defined($groups_join)) {
2021: $request .= $groups_join;
2022: }
2023: $request .= ' WHERE a.symb_id='.$symb_id.' AND a.part_id='.$part_id;
2024: #
2025: # Limit the students included to those specified
2026: if (defined($Sections) && lc($Sections->[0]) ne 'all') {
2027: $request .= ' AND ('.
2028: join(' OR ', map { "b.section='".$_."'" } @$Sections
2029: ).')';
2030: }
2031: if (defined($status) && lc($status) ne 'any') {
2032: $request .= " AND b.status='".$status."'";
2033: }
2034: #
2035: # Limit by starttime and endtime
2036: my $time_requirements = undef;
2037: if (defined($starttime)) {
2038: $time_requirements .= 'a.timestamp>='.$starttime;
2039: if (defined($endtime)) {
2040: $time_requirements .= ' AND a.timestamp<='.$endtime;
2041: }
2042: } elsif (defined($endtime)) {
2043: $time_requirements .= 'a.timestamp<='.$endtime;
2044: }
2045: if (defined($time_requirements)) {
2046: $request .= ' AND '.$time_requirements;
2047: }
2048: # Limit by group, as required
2049: if (defined($group_limits)) {
2050: $request .= ' AND '.$group_limits;
2051: }
2052: #
2053: # Finally, execute the request to create the temporary table
2054: $dbh->do($request);
2055: #
2056: # Collect the first suite of statistics
2057: $request = 'SELECT COUNT(*),SUM(tries),'.
2058: 'AVG(tries),STD(tries) '.
2059: 'FROM '.$stats_table;
2060: my ($num,$tries,$mean,$STD) = &execute_SQL_request
2061: ($dbh,$request);
2062: #
2063: $request = 'SELECT MAX(tries),MIN(tries) FROM '.$stats_table.
2064: ' WHERE awarded>0';
2065: if (defined($time_requirements)) {
2066: $request .= ' AND '.$time_requirements;
2067: }
2068: my ($max,$min) = &execute_SQL_request($dbh,$request);
2069: #
2070: $request = 'SELECT SUM(awarded) FROM '.$stats_table;
2071: if (defined($time_requirements)) {
2072: $request .= ' AND '.$time_requirements;
2073: }
2074: my ($Solved) = &execute_SQL_request($dbh,$request);
2075: #
2076: $request = 'SELECT SUM(awarded) FROM '.$stats_table.
2077: " WHERE solved='correct_by_override'";
2078: if (defined($time_requirements)) {
2079: $request .= ' AND '.$time_requirements;
2080: }
2081: my ($solved) = &execute_SQL_request($dbh,$request);
2082: #
2083: $Solved -= $solved;
2084: #
2085: $num = 0 if (! defined($num));
2086: $tries = 0 if (! defined($tries));
2087: $max = 0 if (! defined($max));
2088: $min = 0 if (! defined($min));
2089: $STD = 0 if (! defined($STD));
2090: $Solved = 0 if (! defined($Solved) || $Solved < 0);
2091: $solved = 0 if (! defined($solved));
2092: #
2093: # Compute the more complicated statistics
2094: my $DegOfDiff = 'nan';
2095: $DegOfDiff = 1-($Solved)/$tries if ($tries>0);
2096: #
2097: my $SKEW = 'nan';
2098: my $wrongpercent = 0;
2099: my $numwrong = 'nan';
2100: if ($num > 0) {
2101: ($SKEW) = &execute_SQL_request($dbh,'SELECT SQRT(SUM('.
2102: 'POWER(tries - '.$STD.',3)'.
2103: '))/'.$num.' FROM '.$stats_table);
2104: $numwrong = $num-$Solved;
2105: $wrongpercent=int(10*100*$numwrong/$num)/10;
2106: }
2107: #
2108: # Drop the temporary table
2109: $dbh->do('DROP TABLE '.$stats_table); # May return an error
2110: #
2111: # Return result
2112: return { num_students => $num,
2113: tries => $tries,
2114: max_tries => $max,
2115: min_tries => $min,
2116: mean_tries => $mean,
2117: std_tries => $STD,
2118: skew_tries => $SKEW,
2119: num_solved => $Solved,
2120: num_override => $solved,
2121: num_wrong => $numwrong,
2122: per_wrong => $wrongpercent,
2123: deg_of_diff => $DegOfDiff };
2124: }
2125:
2126: ##
2127: ## This is a helper for get_statistics
2128: sub execute_SQL_request {
2129: my ($dbh,$request)=@_;
2130: # &Apache::lonnet::logthis($request);
2131: my $sth = $dbh->prepare($request);
2132: if (!$sth) {
2133: die($dbh->errstr . " SQL: $request");
2134: }
2135: $sth->execute();
2136: my $row = $sth->fetchrow_arrayref();
2137: if (ref($row) eq 'ARRAY' && scalar(@$row)>0) {
2138: return @$row;
2139: }
2140: return ();
2141: }
2142:
2143: ######################################################
2144: ######################################################
2145:
2146: =pod
2147:
2148: =item &populate_weight_table
2149:
2150: =cut
2151:
2152: ######################################################
2153: ######################################################
2154: sub populate_weight_table {
2155: my ($courseid) = @_;
2156: if (! defined($courseid)) {
2157: $courseid = $env{'request.course.id'};
2158: }
2159: #
2160: &setup_table_names($courseid);
2161: my $navmap = Apache::lonnavmaps::navmap->new();
2162: if (!defined($navmap)) {
2163: &Apache::lonnet::logthis('loncoursedata::populate_weight_table:'.$/.
2164: ' unable to get navmaps resource'.$/.
2165: ' '.join(' ',(caller)));
2166: return;
2167: }
2168: my @sequences = $navmap->retrieveResources(undef,
2169: sub { shift->is_map(); },1,0,1);
2170: my @resources;
2171: foreach my $seq (@sequences) {
2172: push(@resources,$navmap->retrieveResources($seq,
2173: sub {shift->is_problem();},
2174: 0,0,0));
2175: }
2176: if (! scalar(@resources)) {
2177: &Apache::lonnet::logthis('loncoursedata::populate_weight_table:'.$/.
2178: ' no resources returned for '.$courseid);
2179: return;
2180: }
2181: # Since we use lonnet::EXT to retrieve problem weights,
2182: # to ensure current data we must clear the caches out.
2183: &Apache::lonnet::clear_EXT_cache_status();
2184: my $dbh = &Apache::lonmysql::get_dbh();
2185: my $request = 'INSERT IGNORE INTO '.$weight_table.
2186: "(symb_id,part_id,weight) VALUES ";
2187: my $weight;
2188: foreach my $res (@resources) {
2189: my $symb_id = &get_symb_id($res->symb);
2190: foreach my $part (@{$res->parts}) {
2191: my $part_id = &get_part_id($part);
2192: $weight = &Apache::lonnet::EXT('resource.'.$part.'.weight',
2193: $res->symb,
2194: undef,undef,undef);
2195: if (!defined($weight) || ($weight eq '')) {
2196: $weight=1;
2197: }
2198: $request .= "('".$symb_id."','".$part_id."','".$weight."'),";
2199: }
2200: }
2201: $request =~ s/(,)$//;
2202: # &Apache::lonnet::logthis('request = '.$/.$request);
2203: $dbh->do($request);
2204: if ($dbh->err()) {
2205: &Apache::lonnet::logthis("error ".$dbh->errstr().
2206: " occured executing \n".
2207: $request);
2208: }
2209: return;
2210: }
2211:
2212: ##########################################################
2213: ##########################################################
2214:
2215: =pod
2216:
2217: =item &limit_by_start_end_times
2218:
2219: Build SQL WHERE condition which limits the data collected by the start
2220: and end times provided
2221:
2222: Inputs: $starttime, $endtime, $table
2223:
2224: Returns: $time_limits
2225:
2226: =cut
2227:
2228: ##########################################################
2229: ##########################################################
2230: sub limit_by_start_end_time {
2231: my ($starttime,$endtime,$table) = @_;
2232: my $time_requirements = undef;
2233: if (defined($starttime)) {
2234: $time_requirements .= $table.".timestamp>='".$starttime."'";
2235: if (defined($endtime)) {
2236: $time_requirements .= " AND ".$table.".timestamp<='".$endtime."'";
2237: }
2238: } elsif (defined($endtime)) {
2239: $time_requirements .= $table.".timestamp<='".$endtime."'";
2240: }
2241: return $time_requirements;
2242: }
2243:
2244: ##########################################################
2245: ##########################################################
2246:
2247: =pod
2248:
2249: =item &limit_by_section_and_status
2250:
2251: Build SQL WHERE condition which limits the data collected by section and
2252: student status.
2253:
2254: Inputs: $Sections (array ref)
2255: $enrollment (string: 'any', 'expired', 'active')
2256: $tablename The name of the table that holds the student data
2257:
2258: Returns: $student_requirements,$enrollment_requirements
2259:
2260: =cut
2261:
2262: ##########################################################
2263: ##########################################################
2264: sub limit_by_section_and_status {
2265: my ($Sections,$enrollment,$tablename) = @_;
2266: my $student_requirements = undef;
2267: if ( (defined($Sections) && $Sections->[0] ne 'all')) {
2268: $student_requirements = '('.
2269: join(' OR ', map { $tablename.".section='".$_."'" } @$Sections
2270: ).')';
2271: }
2272: my $enrollment_requirements=undef;
2273: if (defined($enrollment) && $enrollment ne 'Any') {
2274: $enrollment_requirements = $tablename.".status='".$enrollment."'";
2275: }
2276: return ($student_requirements,$enrollment_requirements);
2277: }
2278:
2279: ######################################################
2280: ######################################################
2281:
2282: =pod
2283:
2284: =item &limit_by_group
2285:
2286: Build SQL LEFT JOIN statement to include students_groups and groupnames tables and SQL WHERE condition which limits the data collected by group.
2287:
2288: Inputs: $Groups (array ref)
2289: $stutable The name of the table which holds the student data.
2290: $grptable The name of the table which maps group_id to groupname.
2291: $stugrptab The name of the table which holds student group affiliations.
2292: Returns: $groups_join,$group_limits
2293: $groups_join JOIN part of SQL statement (to include group related tables)
2294: $group_limits SQL WHERE condition limiting to requested groups
2295: =cut
2296:
2297: sub limit_by_group {
2298: my ($Groups,$stutable,$grptable,$stugrptab) = @_;
2299: my $groups_join = undef;
2300: my $group_limits = undef;
2301: if ( (defined($Groups) && $Groups->[0] ne 'all')) {
2302: $groups_join =
2303: ' LEFT JOIN '.$students_groups_table.
2304: ' AS '.$stugrptab.' ON '.
2305: $stugrptab.'.student_id = '.$stutable.'.student_id'.
2306: ' LEFT JOIN '.$groupnames_table.
2307: ' AS '.$grptable.' ON '.
2308: $stugrptab.'.group_id = '.$grptable.'.group_id ';
2309: $group_limits =
2310: ' ('.
2311: join(' OR ', map { "$grptable.groupname='".$_."'" } @$Groups
2312: ).')';
2313: }
2314: return ($groups_join,$group_limits);
2315: }
2316:
2317: =pod
2318:
2319: =item rank_students_by_scores_on_resources
2320:
2321: Inputs:
2322: $resources: array ref of hash ref. Each hash ref needs key 'symb'.
2323: $Sections: array ref of sections to include,
2324: $Groups: array ref of groups to include.
2325: $enrollment: string,
2326: $courseid (may be omitted)
2327: $starttime (may be omitted)
2328: $endtime (may be omitted)
2329: $has_award_for (may be omitted)
2330:
2331: Returns; An array of arrays. The sub arrays contain a student name and
2332: their score on the resources. $starttime and $endtime constrain the
2333: list to awards obtained during the given time limits. $has_score_on
2334: constrains the list to those students who at least attempted the
2335: resource identified by the given symb, which is used to filter out
2336: such students for statistics that would be adversely affected by such
2337: students.
2338:
2339: =cut
2340:
2341: ######################################################
2342: ######################################################
2343: sub RNK_student { return 0; };
2344: sub RNK_score { return 1; };
2345:
2346: sub rank_students_by_scores_on_resources {
2347: my ($resources,$Sections,$Groups,$enrollment,$courseid,$starttime,$endtime,
2348: $has_award_for) = @_;
2349: return if (! defined($resources) || ! ref($resources) eq 'ARRAY');
2350: if (! defined($courseid)) {
2351: $courseid = $env{'request.course.id'};
2352: }
2353: #
2354: &setup_table_names($courseid);
2355: my $dbh = &Apache::lonmysql::get_dbh();
2356: my ($section_limits,$enrollment_limits)=
2357: &limit_by_section_and_status($Sections,$enrollment,'b');
2358: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
2359: my $symb_limits = '('.join(' OR ',map {'a.symb_id='.&get_symb_id($_);
2360: } @$resources
2361: ).')';
2362: my ($award_col, $award_join, $award_clause) = ('', '', '');
2363: if ($has_award_for) {
2364: my $resource_id = &get_symb_id($has_award_for);
2365: $award_col = ", perf.awarded";
2366: $award_join = "LEFT JOIN $performance_table AS perf ON perf.symb_id"
2367: ." = $resource_id AND perf.student_id = b.student_id ";
2368: $award_clause = "AND perf.awarded IS NOT NULL";
2369: }
2370: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
2371: my $request = "SELECT b.student,SUM(a.awarded*w.weight) AS score "
2372: ."$award_col FROM $performance_table AS a ".
2373: "NATURAL LEFT JOIN $weight_table AS w ".
2374: "LEFT JOIN $student_table AS b ON a.student_id=b.student_id ".
2375: "$award_join $groups_join ";
2376: my $limits;
2377: if (defined($section_limits)) {
2378: $limits .= $section_limits.' AND ';
2379: }
2380: if (defined($enrollment_limits)) {
2381: $limits .= $enrollment_limits.' AND ';
2382: }
2383: if (defined($time_limits)) {
2384: $limits .= $time_limits.' AND ';
2385: }
2386: if ($symb_limits ne '()') {
2387: $limits .= $symb_limits.' AND ';
2388: }
2389: if (defined($group_limits)) {
2390: $limits .= $group_limits.' AND ';
2391: }
2392: if ($limits) {
2393: $limits =~ s/( AND )$//; # Remove extra conjunction
2394: $request .= "WHERE $limits";
2395: }
2396: $request .= " $award_clause GROUP BY a.student_id ORDER BY score";
2397: #&Apache::lonnet::logthis('request = '.$/.$request);
2398: my $sth = $dbh->prepare($request) or die "Can't prepare $request";
2399: $sth->execute();
2400: my $rows = $sth->fetchall_arrayref();
2401: return ($rows);
2402: }
2403:
2404: ########################################################
2405: ########################################################
2406:
2407: =pod
2408:
2409: =item &get_sum_of_scores
2410:
2411: Inputs: $resource (hash ref, needs {'symb'} key),
2412: $part, (the part id),
2413: $students (array ref, contents of array are scalars holding 'sname:sdom'),
2414: $courseid
2415:
2416: Returns: the sum of the score on the problem part over the students and the
2417: maximum possible value for the sum (taken from the weight table).
2418:
2419: =cut
2420:
2421: ########################################################
2422: ########################################################
2423: sub get_sum_of_scores {
2424: my ($symb,$part,$students,$courseid,$starttime,$endtime) = @_;
2425: if (! defined($courseid)) {
2426: $courseid = $env{'request.course.id'};
2427: }
2428: if (defined($students) &&
2429: ((@$students == 0) ||
2430: (@$students == 1 && (! defined($students->[0]) ||
2431: $students->[0] eq ''))
2432: )
2433: ){
2434: undef($students);
2435: }
2436: #
2437: &setup_table_names($courseid);
2438: my $dbh = &Apache::lonmysql::get_dbh();
2439: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
2440: my $request = 'SELECT SUM(a.awarded*w.weight),SUM(w.weight) FROM '.
2441: $performance_table.' AS a '.
2442: 'NATURAL LEFT JOIN '.$weight_table.' AS w ';
2443: $request .= 'WHERE a.symb_id='.&get_symb_id($symb).
2444: ' AND a.part_id='.&get_part_id($part);
2445: if (defined($time_limits)) {
2446: $request .= ' AND '.$time_limits;
2447: }
2448: if (defined($students)) {
2449: $request .= ' AND ('.
2450: join(' OR ',map {'a.student_id='.&get_student_id(split(':',$_));
2451: } @$students).
2452: ')';
2453: }
2454: my $sth = $dbh->prepare($request);
2455: $sth->execute();
2456: my $rows = $sth->fetchrow_arrayref();
2457: if ($dbh->err) {
2458: &Apache::lonnet::logthis('error 1 = '.$dbh->errstr());
2459: &Apache::lonnet::logthis('prepared then executed, fetchrow_arrayrefed'.
2460: $/.$request);
2461: return (undef,undef);
2462: }
2463: return ($rows->[0],$rows->[1]);
2464: }
2465:
2466: ########################################################
2467: ########################################################
2468:
2469: =pod
2470:
2471: =item &score_stats
2472:
2473: Inputs: $Sections, $enrollment, $symbs, $starttime,
2474: $endtime, $courseid
2475:
2476: $Sections, $enrollment, $starttime, $endtime, and $courseid are the same as
2477: elsewhere in this module.
2478: $symbs is an array ref of symbs
2479:
2480: Returns: minimum, maximum, mean, s.d., number of students, and maximum
2481: possible of student scores on the given resources
2482:
2483: =cut
2484:
2485: ########################################################
2486: ########################################################
2487: sub score_stats {
2488: my ($Sections,$Groups,$enrollment,$symbs,$starttime,$endtime,$courseid)=@_;
2489: if (! defined($courseid)) {
2490: $courseid = $env{'request.course.id'};
2491: }
2492: #
2493: &setup_table_names($courseid);
2494: my $dbh = &Apache::lonmysql::get_dbh();
2495: #
2496: my ($section_limits,$enrollment_limits)=
2497: &limit_by_section_and_status($Sections,$enrollment,'b');
2498: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
2499: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
2500: my @Symbids = map { &get_symb_id($_); } @{$symbs};
2501: #
2502: my $stats_table = $courseid.'_problem_stats';
2503: my $symb_restriction = join(' OR ',map {'a.symb_id='.$_;} @Symbids);
2504: my $request = 'DROP TABLE '.$stats_table;
2505: $dbh->do($request);
2506: $request =
2507: 'CREATE TEMPORARY TABLE '.$stats_table.' '.
2508: 'SELECT a.student_id,'.
2509: 'SUM(a.awarded*w.weight) AS score FROM '.
2510: $performance_table.' AS a '.
2511: 'NATURAL LEFT JOIN '.$weight_table.' AS w '.
2512: 'LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id '.
2513: $groups_join;
2514: my $limit = ' WHERE ('.$symb_restriction.')';
2515: if ($time_limits) {
2516: $limit .= ' AND '.$time_limits;
2517: }
2518: if ($section_limits) {
2519: $limit .= ' AND '.$section_limits;
2520: }
2521: if ($enrollment_limits) {
2522: $limit .= ' AND '.$enrollment_limits;
2523: }
2524: if ($group_limits) {
2525: $limit .= ' AND '.$group_limits;
2526: }
2527: $request .= $limit.' GROUP BY a.student_id';
2528: # &Apache::lonnet::logthis('request = '.$/.$request);
2529: my $sth = $dbh->prepare($request);
2530: $sth->execute();
2531: $request =
2532: 'SELECT AVG(score),STD(score),MAX(score),MIN(score),COUNT(score) '.
2533: 'FROM '.$stats_table;
2534: my ($ave,$std,$max,$min,$count) = &execute_SQL_request($dbh,$request);
2535: # &Apache::lonnet::logthis('request = '.$/.$request);
2536:
2537: $request = 'SELECT SUM(weight) FROM '.$weight_table.
2538: ' AS a WHERE ('.$symb_restriction.')';
2539: my ($max_possible) = &execute_SQL_request($dbh,$request);
2540: # &Apache::lonnet::logthis('request = '.$/.$request);
2541: return($min,$max,$ave,$std,$count,$max_possible);
2542: }
2543:
2544:
2545: ########################################################
2546: ########################################################
2547:
2548: =pod
2549:
2550: =item &count_stats
2551:
2552: Inputs: $Sections, $Groups, $enrollment, $symbs, $starttime,
2553: $endtime, $courseid
2554:
2555: $Sections, $Groups $enrollment, $starttime, $endtime, and $courseid are the
2556: same as elsewhere in this module.
2557: $symbs is an array ref of symbs
2558:
2559: Returns: minimum, maximum, mean, s.d., and number of students
2560: of the number of items correct on the given resources
2561:
2562: =cut
2563:
2564: ########################################################
2565: ########################################################
2566: sub count_stats {
2567: my ($Sections,$Groups,$enrollment,$symbs,$starttime,$endtime,$courseid)=@_;
2568: if (! defined($courseid)) {
2569: $courseid = $env{'request.course.id'};
2570: }
2571: #
2572: &setup_table_names($courseid);
2573: my $dbh = &Apache::lonmysql::get_dbh();
2574: #
2575: my ($section_limits,$enrollment_limits)=
2576: &limit_by_section_and_status($Sections,$enrollment,'b');
2577: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
2578: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
2579: my @Symbids = map { &get_symb_id($_); } @{$symbs};
2580: #
2581: my $stats_table = $courseid.'_problem_stats';
2582: my $symb_restriction = join(' OR ',map {'a.symb_id='.$_;} @Symbids);
2583: my $request = 'DROP TABLE '.$stats_table;
2584: $dbh->do($request);
2585: $request =
2586: 'CREATE TEMPORARY TABLE '.$stats_table.' '.
2587: 'SELECT a.student_id,'.
2588: 'SUM(a.awarded) AS count FROM '.
2589: $performance_table.' AS a '.
2590: 'LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id '.
2591: $groups_join;
2592: my $limit = ' WHERE ('.$symb_restriction.')';
2593: if ($time_limits) {
2594: $limit .= ' AND '.$time_limits;
2595: }
2596: if ($section_limits) {
2597: $limit .= ' AND '.$section_limits;
2598: }
2599: if ($enrollment_limits) {
2600: $limit .= ' AND '.$enrollment_limits;
2601: }
2602: if ($group_limits) {
2603: $limit .= ' AND '.$group_limits;
2604: }
2605: $request .= $limit.' GROUP BY a.student_id';
2606: # &Apache::lonnet::logthis('request = '.$/.$request);
2607: my $sth = $dbh->prepare($request);
2608: $sth->execute();
2609: $request =
2610: 'SELECT AVG(count),STD(count),MAX(count),MIN(count),COUNT(count) '.
2611: 'FROM '.$stats_table;
2612: my ($ave,$std,$max,$min,$count) = &execute_SQL_request($dbh,$request);
2613: # &Apache::lonnet::logthis('request = '.$/.$request);
2614: return($min,$max,$ave,$std,$count);
2615: }
2616:
2617: ######################################################
2618: ######################################################
2619:
2620: =pod
2621:
2622: =item get_student_data
2623:
2624: =cut
2625:
2626: ######################################################
2627: ######################################################
2628: sub get_student_data {
2629: my ($students,$courseid) = @_;
2630: $courseid = $env{'request.course.id'} if (! defined($courseid));
2631: &setup_table_names($courseid);
2632: my $dbh = &Apache::lonmysql::get_dbh();
2633: return undef if (! defined($dbh));
2634: my $request = 'SELECT '.
2635: 'student_id, student '.
2636: 'FROM '.$student_table;
2637: if (defined($students)) {
2638: $request .= ' WHERE ('.
2639: join(' OR ', map {'student_id='.
2640: &get_student_id($_->{'username'},
2641: $_->{'domain'})
2642: } @$students
2643: ).')';
2644: }
2645: $request.= ' ORDER BY student_id';
2646: my $sth = $dbh->prepare($request);
2647: $sth->execute();
2648: if ($dbh->err) {
2649: &Apache::lonnet::logthis('error 2 = '.$dbh->errstr());
2650: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2651: return undef;
2652: }
2653: my $dataset = $sth->fetchall_arrayref();
2654: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2655: return $dataset;
2656: }
2657: }
2658:
2659: sub RD_student_id { return 0; }
2660: sub RD_awarddetail { return 1; }
2661: sub RD_response_eval { return 2; }
2662: sub RD_response_eval_2 { return 3; }
2663: sub RD_submission { return 4; }
2664: sub RD_timestamp { return 5; }
2665: sub RD_tries { return 6; }
2666: sub RD_sname { return 7; }
2667:
2668: sub get_response_data {
2669: my ($Sections,$Groups,$enrollment,$symb,$response,$courseid) = @_;
2670: return undef if (! defined($symb) ||
2671: ! defined($response));
2672: $courseid = $env{'request.course.id'} if (! defined($courseid));
2673: #
2674: &setup_table_names($courseid);
2675: my $symb_id = &get_symb_id($symb);
2676: if (! defined($symb_id)) {
2677: &Apache::lonnet::logthis('Unable to find symb for '.$symb.' in '.$courseid);
2678: return undef;
2679: }
2680: my $response_id = &get_part_id($response);
2681: if (! defined($response_id)) {
2682: &Apache::lonnet::logthis('Unable to find id for '.$response.' in '.$courseid);
2683: return undef;
2684: }
2685: #
2686: my $dbh = &Apache::lonmysql::get_dbh();
2687: return undef if (! defined($dbh));
2688: #
2689: my ($student_requirements,$enrollment_requirements) =
2690: &limit_by_section_and_status($Sections,$enrollment,'d');
2691: my ($groups_join,$group_limits) = &limit_by_group($Groups,'d','e','f');
2692: my $request = 'SELECT '.
2693: 'a.student_id, a.awarddetail, a.response_specific_value, '.
2694: 'a.response_specific_value_2, a.submission, b.timestamp, '.
2695: 'c.tries, d.student '.
2696: 'FROM '.$fulldump_response_table.' AS a '.
2697: 'LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
2698: 'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
2699: 'a.transaction = b.transaction '.
2700: 'LEFT JOIN '.$fulldump_part_table.' AS c '.
2701: 'ON a.symb_id=c.symb_id AND a.student_id=c.student_id AND '.
2702: 'a.part_id=c.part_id AND a.transaction = c.transaction '.
2703: 'LEFT JOIN '.$student_table.' AS d '.
2704: 'ON a.student_id=d.student_id '.
2705: $groups_join;
2706: my $limit = ' WHERE '.
2707: 'a.symb_id='.$symb_id.' AND a.response_id='.$response_id;
2708: if (defined($student_requirements)) {
2709: $limit .= ' AND '.$student_requirements;
2710: }
2711: if (defined($enrollment_requirements)) {
2712: $limit .= ' AND '.$enrollment_requirements;
2713: }
2714: if (defined($group_limits)) {
2715: $limit .= ' AND '.$group_limits;
2716: }
2717: $request .= $limit.' ORDER BY b.timestamp';
2718: # &Apache::lonnet::logthis("request =\n".$request);
2719: my $sth = $dbh->prepare($request);
2720: $sth->execute();
2721: if ($dbh->err) {
2722: &Apache::lonnet::logthis('error 3 = '.$dbh->errstr());
2723: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2724: return undef;
2725: }
2726: my $dataset = $sth->fetchall_arrayref();
2727: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2728: # Clear the \'s from around the submission
2729: for (my $i =0;$i<scalar(@$dataset);$i++) {
2730: $dataset->[$i]->[3] =~ s/(\'$|^\')//g;
2731: }
2732: return $dataset;
2733: }
2734: }
2735:
2736:
2737: sub RDs_awarddetail { return 3; }
2738: sub RDs_submission { return 2; }
2739: sub RDs_timestamp { return 1; }
2740: sub RDs_tries { return 0; }
2741: sub RDs_awarded { return 4; }
2742: sub RDs_response_eval { return 5; }
2743: sub RDs_response_eval_2 { return 6; }
2744: sub RDs_part_award { return 7; }
2745:
2746: sub get_response_data_by_student {
2747: my ($student,$symb,$response,$courseid) = @_;
2748: return undef if (! defined($symb) ||
2749: ! defined($response));
2750: $courseid = $env{'request.course.id'} if (! defined($courseid));
2751: #
2752: &setup_table_names($courseid);
2753: my $symb_id = &get_symb_id($symb);
2754: my $response_id = &get_part_id($response);
2755: #
2756: my $student_id = &get_student_id($student->{'username'},
2757: $student->{'domain'});
2758: my @group_ids = &get_students_groupids($student_id);
2759: #
2760: my $dbh = &Apache::lonmysql::get_dbh();
2761: return undef if (! defined($dbh));
2762: my $request = 'SELECT '.
2763: 'c.tries, b.timestamp, a.submission, a.awarddetail, c.awarded, '.
2764: 'a.response_specific_value, a.response_specific_value_2, c.award '.
2765: 'FROM '.$fulldump_response_table.' AS a '.
2766: 'LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
2767: 'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
2768: 'a.transaction = b.transaction '.
2769: 'LEFT JOIN '.$fulldump_part_table.' AS c '.
2770: 'ON a.symb_id=c.symb_id AND a.student_id=c.student_id AND '.
2771: 'a.part_id=c.part_id AND a.transaction = c.transaction '.
2772: 'LEFT JOIN '.$student_table.' AS d '.
2773: 'ON a.student_id=d.student_id '.
2774: 'LEFT JOIN '.$performance_table.' AS e '.
2775: 'ON a.symb_id=e.symb_id AND a.part_id=e.part_id AND '.
2776: 'a.student_id=e.student_id AND c.tries=e.tries '.
2777: 'WHERE '.
2778: 'a.symb_id='.$symb_id.' AND a.response_id='.$response_id.
2779: ' AND a.student_id='.$student_id.' ORDER BY b.timestamp';
2780: # &Apache::lonnet::logthis("request =\n".$request);
2781: my $sth = $dbh->prepare($request);
2782: $sth->execute();
2783: if ($dbh->err) {
2784: &Apache::lonnet::logthis('error 4 = '.$dbh->errstr());
2785: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2786: return undef;
2787: }
2788: my $dataset = $sth->fetchall_arrayref();
2789: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2790: # Clear the \'s from around the submission
2791: for (my $i =0;$i<scalar(@$dataset);$i++) {
2792: $dataset->[$i]->[2] =~ s/(\'$|^\')//g;
2793: }
2794: return $dataset;
2795: }
2796: return undef; # error occurred
2797: }
2798:
2799: sub RT_student_id { return 0; }
2800: sub RT_awarded { return 1; }
2801: sub RT_tries { return 2; }
2802: sub RT_timestamp { return 3; }
2803:
2804: sub get_response_time_data {
2805: my ($sections,$groups,$enrollment,$symb,$part,$courseid) = @_;
2806: return undef if (! defined($symb) ||
2807: ! defined($part));
2808: $courseid = $env{'request.course.id'} if (! defined($courseid));
2809: #
2810: &setup_table_names($courseid);
2811: my $symb_id = &get_symb_id($symb);
2812: if (! defined($symb_id)) {
2813: &Apache::lonnet::logthis('Unable to find symb for '.$symb.' in '.$courseid);
2814: return undef;
2815: }
2816: my $part_id = &get_part_id($part);
2817: if (! defined($part_id)) {
2818: &Apache::lonnet::logthis('Unable to find id for '.$part.' in '.$courseid);
2819: return undef;
2820: }
2821: #
2822: my $dbh = &Apache::lonmysql::get_dbh();
2823: return undef if (! defined($dbh));
2824: my ($student_requirements,$enrollment_requirements) =
2825: &limit_by_section_and_status($sections,$enrollment,'d');
2826: my ($groups_join,$group_limits) = &limit_by_group($groups,'d','e','f');
2827: my $request = 'SELECT '.
2828: 'a.student_id, a.awarded, a.tries, b.timestamp '.
2829: 'FROM '.$fulldump_part_table.' AS a '.
2830: 'LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
2831: 'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
2832: 'a.transaction = b.transaction '.
2833: 'LEFT JOIN '.$student_table.' as d '.
2834: 'ON a.student_id=d.student_id '.
2835: $groups_join;
2836: my $limit = ' WHERE '.
2837: 'a.symb_id='.$symb_id.' AND a.part_id='.$part_id;
2838: if (defined($student_requirements)) {
2839: $limit .= ' AND '.$student_requirements;
2840: }
2841: if (defined($enrollment_requirements)) {
2842: $limit .= ' AND '.$enrollment_requirements;
2843: }
2844: if (defined($group_limits)) {
2845: $limit .= ' AND '.$group_limits;
2846: }
2847: $request .= $limit.' ORDER BY b.timestamp';
2848: # &Apache::lonnet::logthis("request =\n".$request);
2849: my $sth = $dbh->prepare($request);
2850: $sth->execute();
2851: if ($dbh->err) {
2852: &Apache::lonnet::logthis('error 5 = '.$dbh->errstr());
2853: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2854: return undef;
2855: }
2856: my $dataset = $sth->fetchall_arrayref();
2857: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2858: return $dataset;
2859: }
2860:
2861: }
2862:
2863: ################################################
2864: ################################################
2865:
2866: =pod
2867:
2868: =item &get_student_scores($Sections,$Groups,$Symbs,$enrollment,$courseid)
2869:
2870: =cut
2871:
2872: ################################################
2873: ################################################
2874: sub get_student_scores {
2875: my ($sections,$groups,$Symbs,$enrollment,$courseid,$starttime,$endtime) = @_;
2876: $courseid = $env{'request.course.id'} if (! defined($courseid));
2877: &setup_table_names($courseid);
2878: my $dbh = &Apache::lonmysql::get_dbh();
2879: return (undef) if (! defined($dbh));
2880: my $tmptable = $courseid.'_temp_'.time;
2881: my $request = 'DROP TABLE IF EXISTS '.$tmptable;
2882: # &Apache::lonnet::logthis('request = '.$/.$request);
2883: $dbh->do($request);
2884: #
2885: my $symb_requirements;
2886: if (defined($Symbs) && @$Symbs) {
2887: $symb_requirements = '('.
2888: join(' OR ', map{ "(a.symb_id='".&get_symb_id($_->{'symb'}).
2889: "' AND a.part_id='".&get_part_id($_->{'part'}).
2890: "')"
2891: } @$Symbs).')';
2892: }
2893: #
2894: my ($student_requirements,$enrollment_requirements) =
2895: &limit_by_section_and_status($sections,$enrollment,'b');
2896: #
2897: my ($groups_join,$group_limits) = &limit_by_group($groups,'b','d','e');
2898: my $time_requirements = &limit_by_start_end_time($starttime,$endtime,'a');
2899: ##
2900: $request = 'CREATE TEMPORARY TABLE IF NOT EXISTS '.$tmptable.
2901: ' SELECT a.student_id,SUM(a.awarded*c.weight) AS score FROM '.
2902: $performance_table.' AS a ';
2903: $request .= "LEFT JOIN ".$weight_table.' AS c ON a.symb_id=c.symb_id AND a.part_id=c.part_id ';
2904: if (defined($student_requirements) || defined($enrollment_requirements)) {
2905: $request .= ' LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id ';
2906: }
2907: if (defined($groups_join)) {
2908: $request .= $groups_join;
2909: }
2910: if (defined($symb_requirements) ||
2911: defined($student_requirements) ||
2912: defined($enrollment_requirements) ||
2913: defined($group_limits) ) {
2914: $request .= ' WHERE ';
2915: }
2916: if (defined($symb_requirements)) {
2917: $request .= $symb_requirements.' AND ';
2918: }
2919: if (defined($student_requirements)) {
2920: $request .= $student_requirements.' AND ';
2921: }
2922: if (defined($enrollment_requirements)) {
2923: $request .= $enrollment_requirements.' AND ';
2924: }
2925: if (defined($time_requirements)) {
2926: $request .= $time_requirements.' AND ';
2927: }
2928: $request =~ s/ AND $//; # Strip of the trailing ' AND '.
2929: $request .= ' GROUP BY a.student_id';
2930: # &Apache::lonnet::logthis("request = \n".$request);
2931: my $sth = $dbh->prepare($request);
2932: $sth->execute();
2933: if ($dbh->err) {
2934: &Apache::lonnet::logthis('error 6 = '.$dbh->errstr());
2935: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2936: return undef;
2937: }
2938: $request = 'SELECT score,COUNT(*) FROM '.$tmptable.' GROUP BY score';
2939: # &Apache::lonnet::logthis("request = \n".$request);
2940: $sth = $dbh->prepare($request);
2941: $sth->execute();
2942: if ($dbh->err) {
2943: &Apache::lonnet::logthis('error 7 = '.$dbh->errstr());
2944: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2945: return undef;
2946: }
2947: my $dataset = $sth->fetchall_arrayref();
2948: return $dataset;
2949: }
2950:
2951: ################################################
2952: ################################################
2953:
2954: =pod
2955:
2956: =item &setup_table_names()
2957:
2958: input: course id
2959:
2960: output: none
2961:
2962: Cleans up the package variables for local caching.
2963:
2964: =cut
2965:
2966: ################################################
2967: ################################################
2968: sub setup_table_names {
2969: my ($courseid) = @_;
2970: if (! defined($courseid)) {
2971: $courseid = $env{'request.course.id'};
2972: }
2973: #
2974: if (! defined($current_course) || $current_course ne $courseid) {
2975: # Clear out variables
2976: $have_read_part_table = 0;
2977: undef(%ids_by_part);
2978: undef(%parts_by_id);
2979: $have_read_symb_table = 0;
2980: undef(%ids_by_symb);
2981: undef(%symbs_by_id);
2982: $have_read_student_table = 0;
2983: undef(%ids_by_student);
2984: undef(%students_by_id);
2985: $have_read_groupnames_table = 0;
2986: undef(%ids_by_groupname);
2987: #
2988: $current_course = $courseid;
2989: }
2990: #
2991: # Set up database names
2992: my $base_id = $courseid;
2993: $symb_table = $base_id.'_'.'symb';
2994: $part_table = $base_id.'_'.'part';
2995: $student_table = $base_id.'_'.'student';
2996: $groupnames_table = $base_id.'_'.'groupnames';
2997: $students_groups_table = $base_id.'_'.'studentgroups';
2998: $performance_table = $base_id.'_'.'performance';
2999: $parameters_table = $base_id.'_'.'parameters';
3000: $fulldump_part_table = $base_id.'_'.'partdata';
3001: $fulldump_response_table = $base_id.'_'.'responsedata';
3002: $fulldump_timestamp_table = $base_id.'_'.'timestampdata';
3003: $weight_table = $base_id.'_'.'weight';
3004: #
3005: @Tables = (
3006: $symb_table,
3007: $part_table,
3008: $student_table,
3009: $groupnames_table,
3010: $students_groups_table,
3011: $performance_table,
3012: $parameters_table,
3013: $fulldump_part_table,
3014: $fulldump_response_table,
3015: $fulldump_timestamp_table,
3016: $weight_table,
3017: );
3018: return;
3019: }
3020:
3021: ################################################
3022: ################################################
3023:
3024: =pod
3025:
3026: =back
3027:
3028: =item End of Local Data Caching Subroutines
3029:
3030: =cut
3031:
3032: ################################################
3033: ################################################
3034:
3035: } # End scope of table identifiers
3036:
3037: ################################################
3038: ################################################
3039:
3040: =pod
3041:
3042: =head3 Classlist Subroutines
3043:
3044: =item &get_classlist();
3045:
3046: Retrieve the classist of a given class or of the current class. Student
3047: information is returned from the classlist.db file and, if needed,
3048: from the students environment.
3049:
3050: Optional arguments are $cdom, and $cnum (course domain,
3051: and course number, respectively). If either is ommitted the course
3052: will be taken from the current environment ($env{'request.course.id'},
3053: $env{'course.'.$cid.'.domain'}, and $env{'course.'.$cid.'.num'}).
3054:
3055: Returns a reference to a hash which contains:
3056: keys '$sname:$sdom'
3057: values [$sdom,$sname,$end,$start,$id,$section,$fullname,$status,$type,$lockedtype]
3058:
3059: The constant values CL_SDOM, CL_SNAME, CL_END, etc. can be used
3060: as indices into the returned list to future-proof clients against
3061: changes in the list order.
3062:
3063: =cut
3064:
3065: ################################################
3066: ################################################
3067:
3068: sub CL_SDOM { return 0; }
3069: sub CL_SNAME { return 1; }
3070: sub CL_END { return 2; }
3071: sub CL_START { return 3; }
3072: sub CL_ID { return 4; }
3073: sub CL_SECTION { return 5; }
3074: sub CL_FULLNAME { return 6; }
3075: sub CL_STATUS { return 7; }
3076: sub CL_TYPE { return 8; }
3077: sub CL_LOCKEDTYPE { return 9; }
3078:
3079: sub get_classlist {
3080: my ($cdom,$cnum) = @_;
3081: my $cid = $cdom.'_'.$cnum;
3082: if (!defined($cdom) || !defined($cnum)) {
3083: $cid = $env{'request.course.id'};
3084: $cdom = $env{'course.'.$cid.'.domain'};
3085: $cnum = $env{'course.'.$cid.'.num'};
3086: }
3087: my $now = time;
3088: #
3089: my %classlist=&Apache::lonnet::dump('classlist',$cdom,$cnum);
3090: while (my ($student,$info) = each(%classlist)) {
3091: if ($student =~ /^(con_lost|error|no_such_host)/i) {
3092: &Apache::lonnet::logthis('get_classlist error for '.$cid.':'.$student);
3093: return undef;
3094: }
3095: my ($sname,$sdom) = split(/:/,$student);
3096: my @Values = split(/:/,$info);
3097: my ($end,$start,$id,$section,$fullname,$type,$lockedtype);
3098: if (@Values > 2) {
3099: ($end,$start,$id,$section,$fullname,$type,$lockedtype) = @Values;
3100: } else { # We have to get the data ourselves
3101: ($end,$start) = @Values;
3102: $section = &Apache::lonnet::getsection($sdom,$sname,$cid);
3103: my %info=&Apache::lonnet::get('environment',
3104: ['firstname','middlename',
3105: 'lastname','generation','id'],
3106: $sdom, $sname);
3107: my ($tmp) = keys(%info);
3108: if ($tmp =~/^(con_lost|error|no_such_host)/i) {
3109: $fullname = 'not available';
3110: $id = 'not available';
3111: &Apache::lonnet::logthis('unable to retrieve environment '.
3112: 'for '.$sname.':'.$sdom);
3113: } else {
3114: $fullname = &Apache::lonnet::format_name(@info{qw/firstname middlename lastname generation/},'lastname');
3115: $id = $info{'id'};
3116: }
3117: # Update the classlist with this students information
3118: if ($fullname ne 'not available') {
3119: my $enrolldata = join(':',$end,$start,$id,$section,$fullname);
3120: my $reply=&Apache::lonnet::cput('classlist',
3121: {$student => $enrolldata},
3122: $cdom,$cnum);
3123: if ($reply !~ /^(ok|delayed)/) {
3124: &Apache::lonnet::logthis('Unable to update classlist for '.
3125: 'student '.$sname.':'.$sdom.
3126: ' error:'.$reply);
3127: }
3128: }
3129: }
3130: my $status='Expired';
3131: if(((!$end) || $now < $end) && ((!$start) || ($now > $start))) {
3132: $status='Active';
3133: }
3134: $classlist{$student} =
3135: [$sdom,$sname,$end,$start,$id,$section,$fullname,$status,$type,$lockedtype];
3136: }
3137: if (wantarray()) {
3138: return (\%classlist,['domain','username','end','start','id',
3139: 'section','fullname','status','type','lockedtype']);
3140: } else {
3141: return \%classlist;
3142: }
3143: }
3144:
3145: sub get_group_memberships {
3146: my ($classlist,$keylist,$cdom,$cnum) = @_;
3147: my $cid = $cdom.'_'.$cnum;
3148: if (!defined($cdom) || !defined($cnum)) {
3149: $cid = $env{'request.course.id'};
3150: $cdom = $env{'course.'.$cid.'.domain'};
3151: $cnum = $env{'course.'.$cid.'.num'};
3152: }
3153: my (%classgroups,%studentgroups);
3154: my $now = time;
3155: my $access_end = $env{'course.'.$cid.'.default_enrollment_end_date'};
3156: my %curr_groups =&Apache::longroup::coursegroups($cdom,$cnum);
3157: if (%curr_groups) {
3158: my $grpindex = scalar(@{$keylist});
3159: my %groupmemberhash =
3160: &Apache::lonnet::get_group_membership($cdom,$cnum);
3161: foreach my $student (keys(%{$classlist})) {
3162: %{$classgroups{$student}} = ();
3163: my $hasgroup = 0;
3164: foreach my $status ('previous','future','active','aftercourse') {
3165: %{$classgroups{$student}{$status}} = ();
3166: }
3167: foreach my $group (keys(%curr_groups)) {
3168: if (defined($groupmemberhash{$group.':'.$student})) {
3169: my ($end,$start) = split(/:/,$groupmemberhash{$group.':'.
3170: $student});
3171: if ($start == -1) {
3172: next;
3173: } else {
3174: $studentgroups{$group} ++;
3175: $hasgroup = 1;
3176: if ($end && $end < $now) {
3177: $classgroups{$student}{'previous'}{$group} =
3178: $groupmemberhash{$group.':'.$student};
3179: if ($classlist->{$student}[&CL_STATUS()] eq 'Expired') {
3180: if ($access_end && $access_end < $now) {
3181: if ($access_end - $end < 86400) {
3182: $classgroups{$student}{'aftercourse'}{$group} = $groupmemberhash{$group.':'.$student};
3183: }
3184: }
3185: }
3186: } elsif ($now > $start) {
3187: if (!$end || $end > $now) {
3188: $classgroups{$student}{'active'}{$group} =
3189: $groupmemberhash{$group.':'.$student};
3190: }
3191: } else {
3192: $classgroups{$student}{'future'}{$group} =
3193: $groupmemberhash{$group.':'.$student};
3194: }
3195: }
3196: }
3197: }
3198: if (!$hasgroup) {
3199: $studentgroups{'none'} ++;
3200: } else {
3201: $classlist->{$student}->[$grpindex] = join(',',
3202: sort(keys(%{$classgroups{$student}{'active'}})));
3203: }
3204: }
3205: }
3206: return (\%classgroups,\%studentgroups);
3207: }
3208:
3209: sub get_students_groups {
3210: my ($student,$enrollment_status,$classgroups) = @_;
3211: my @studentsgroups = ();
3212: if (ref($$classgroups{$student}{'active'}) eq 'HASH') {
3213: push(@studentsgroups,keys(%{$$classgroups{$student}{'active'}}));
3214: }
3215: if ($enrollment_status eq 'Any') {
3216: foreach my $status ('previous','future') {
3217: if (ref($$classgroups{$student}{$status}) eq 'HASH') {
3218: push(@studentsgroups,keys(%{$$classgroups{$student}{$status}}));
3219: }
3220: }
3221: } else {
3222: if (ref($$classgroups{$student}{'aftercourse'}) eq 'HASH') {
3223: push(@studentsgroups,keys(%{$$classgroups{$student}{'aftercourse'}}));
3224: }
3225: }
3226: return @studentsgroups;
3227: }
3228:
3229:
3230: # ----- END HELPER FUNCTIONS --------------------------------------------
3231:
3232: 1;
3233: __END__
3234:
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