1: # The LearningOnline Network with CAPA
2: #
3: # $Id: loncoursedata.pm,v 1.168 2006/05/05 21:35:31 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 Time::HiRes;
55: use Apache::lonmysql;
56: use HTML::TokeParser;
57: use GDBM_File;
58:
59: =pod
60:
61: =head1 DOWNLOAD INFORMATION
62:
63: This section contains all the functions that get data from other servers
64: and/or itself.
65:
66: =cut
67:
68: ################################################
69: ################################################
70:
71: =pod
72:
73: =item &make_into_hash($values);
74:
75: Returns a reference to a hash as described by $values. $values is
76: assumed to be the result of
77: join(':',map {&Apache::lonnet::escape($_)} %orighash);
78:
79: This is a helper function for get_current_state.
80:
81: =cut
82:
83: ################################################
84: ################################################
85: sub make_into_hash {
86: my $values = shift;
87: my %tmp = map { &Apache::lonnet::unescape($_); }
88: split(':',$values);
89: return \%tmp;
90: }
91:
92:
93: ################################################
94: ################################################
95:
96: =pod
97:
98: =head1 LOCAL DATA CACHING SUBROUTINES
99:
100: The local caching is done using MySQL. There is no fall-back implementation
101: if MySQL is not running.
102:
103: The programmers interface is to call &get_current_state() or some other
104: primary interface subroutine (described below). The internals of this
105: storage system are documented here.
106:
107: There are six tables used to store student performance data (the results of
108: a dumpcurrent). Each of these tables is created in MySQL with a name of
109: $courseid_*****, where ***** is 'symb', 'part', or whatever is appropriate
110: for the table. The tables and their purposes are described below.
111:
112: Some notes before we get started.
113:
114: Each table must have a PRIMARY KEY, which is a column or set of columns which
115: will serve to uniquely identify a row of data. NULL is not allowed!
116:
117: INDEXes work best on integer data.
118:
119: JOIN is used to combine data from many tables into one output.
120:
121: lonmysql.pm is used for some of the interface, specifically the table creation
122: calls. The inserts are done in bulk by directly calling the database handler.
123: The SELECT ... JOIN statement used to retrieve the data does not have an
124: interface in lonmysql.pm and I shudder at the thought of writing one.
125:
126: =head3 Table Descriptions
127:
128: =over 4
129:
130: =item Tables used to store meta information
131:
132: The following tables hold data required to keep track of the current status
133: of a students data in the tables or to look up the students data in the tables.
134:
135: =over 4
136:
137: =item $symb_table
138:
139: The symb_table has two columns. The first is a 'symb_id' and the second
140: is the text name for the 'symb' (limited to 64k). The 'symb_id' is generated
141: automatically by MySQL so inserts should be done on this table with an
142: empty first element. This table has its PRIMARY KEY on the 'symb_id'.
143:
144: =item $part_table
145:
146: The part_table has two columns. The first is a 'part_id' and the second
147: is the text name for the 'part' (limited to 100 characters). The 'part_id' is
148: generated automatically by MySQL so inserts should be done on this table with
149: an empty first element. This table has its PRIMARY KEY on the 'part' (100
150: characters) and a KEY on 'part_id'.
151:
152: =item $student_table
153:
154: The student_table has 7 columns. The first is a 'student_id' assigned by
155: MySQL. The second is 'student' which is username:domain. The third through
156: fifth are 'section', 'status' (enrollment status), and 'classification'
157: (to be used in the future). The sixth and seventh ('updatetime' and
158: 'fullupdatetime') contain the time of last update and full update of student
159: data. This table has its PRIMARY KEY on the 'student_id' column and is indexed
160: on 'student', 'section', and 'status'.
161:
162: =item $groupnames_table
163:
164: The groupnames_table has 2 columns. The first is a 'group_id' assigned by
165: MySQL. The second is 'groupname' which is the name of the group in the course.
166:
167: =item $students_groups_table
168:
169: The students_groups_table has 2 columns. The first is the 'student_id', and the
170: second is the 'group_id'. These two columns comprise the PRIMARY KEY for this
171: table, as an individual student may be affiliated with more than one group at
172: any time. This table is indexed on both student_id and group_id.
173:
174: =back
175:
176: =item Tables used to store current status data
177:
178: The following tables store data only about the students current status on
179: a problem, meaning only the data related to the last attempt on a problem.
180:
181: =over 4
182:
183: =item $performance_table
184:
185: The performance_table has 9 columns. The first three are 'symb_id',
186: 'student_id', and 'part_id'. These comprise the PRIMARY KEY for this table
187: and are directly related to the $symb_table, $student_table, and $part_table
188: described above. MySQL does better indexing on numeric items than text,
189: so we use these three "index tables". The remaining columns are
190: 'solved', 'tries', 'awarded', 'award', 'awarddetail', and 'timestamp'.
191: These are either the MySQL type TINYTEXT or various integers ('tries' and
192: 'timestamp'). This table has KEYs of 'student_id' and 'symb_id'.
193: For use of this table, see the functions described below.
194:
195: =item $parameters_table
196:
197: The parameters_table holds the data that does not fit neatly into the
198: performance_table. The parameters table has four columns: 'symb_id',
199: 'student_id', 'parameter', and 'value'. 'symb_id', 'student_id', and
200: 'parameter' comprise the PRIMARY KEY for this table. 'parameter' is
201: limited to 255 characters. 'value' is limited to 64k characters.
202:
203: =back
204:
205: =item Tables used for storing historic data
206:
207: The following tables are used to store almost all of the transactions a student
208: has made on a homework problem. See loncapa/docs/homework/datastorage for
209: specific information about each of the parameters stored.
210:
211: =over 4
212:
213: =item $fulldump_response_table
214:
215: The response table holds data (documented in loncapa/docs/homework/datastorage)
216: associated with a particular response id which is stored when a student
217: attempts a problem. The following are the columns of the table, in order:
218: 'symb_id','part_id','response_id','student_id','transaction','tries',
219: 'awarddetail', 'response_specific', 'response_specific_value',
220: 'response_specific_2', 'response_specific_value_2', and 'submission
221: (the text of the students submission). The primary key is based on the
222: first five columns listed above.
223:
224: =item $fulldump_part_table
225:
226: The part table holds data (documented in loncapa/docs/homework/datastorage)
227: associated with a particular part id which is stored when a student attempts
228: a problem. The following are the columns of the table, in order:
229: 'symb_id','part_id','student_id','transaction','tries','award','awarded',
230: and 'previous'. The primary key is based on the first five columns listed
231: above.
232:
233: =item $fulldump_timestamp_table
234:
235: The timestamp table holds the timestamps of the transactions which are
236: stored in $fulldump_response_table and $fulldump_part_table. This data is
237: about both the response and part data. Columns: 'symb_id','student_id',
238: 'transaction', and 'timestamp'.
239: The primary key is based on the first 3 columns.
240:
241: =item $weight_table
242:
243: The weight table holds the weight for the problems used in the class.
244: Whereas the weight of a problem can vary by section and student the data
245: here is applied to the class as a whole.
246: Columns: 'symb_id','part_id','response_id','weight'.
247:
248: =back
249:
250: =back
251:
252: =head3 Important Subroutines
253:
254: Here is a brief overview of the subroutines which are likely to be of
255: interest:
256:
257: =over 4
258:
259: =item &get_current_state(): programmers interface.
260:
261: =item &init_dbs(): table creation
262:
263: =item &update_student_data(): data storage calls
264:
265: =item &get_student_data_from_performance_cache(): data retrieval
266:
267: =back
268:
269: =head3 Main Documentation
270:
271: =over 4
272:
273: =cut
274:
275: ################################################
276: ################################################
277:
278: ################################################
279: ################################################
280: { # Begin scope of table identifiers
281:
282: my $current_course ='';
283: my $symb_table;
284: my $part_table;
285: my $student_table;
286: my $groupnames_table;
287: my $students_groups_table;
288: my $performance_table;
289: my $parameters_table;
290: my $fulldump_response_table;
291: my $fulldump_part_table;
292: my $fulldump_timestamp_table;
293: my $weight_table;
294:
295: my @Tables;
296: ################################################
297: ################################################
298:
299: =pod
300:
301: =item &init_dbs()
302:
303: Input: course id
304:
305: Output: 0 on success, positive integer on error
306:
307: This routine issues the calls to lonmysql to create the tables used to
308: store student data.
309:
310: =cut
311:
312: ################################################
313: ################################################
314: sub init_dbs {
315: my ($courseid,$drop) = @_;
316: &setup_table_names($courseid);
317: #
318: # Drop any of the existing tables
319: if ($drop) {
320: foreach my $table (@Tables) {
321: &Apache::lonmysql::drop_table($table);
322: }
323: }
324: #
325: # Note - changes to this table must be reflected in the code that
326: # stores the data (calls &Apache::lonmysql::store_row with this table
327: # id
328: my $symb_table_def = {
329: id => $symb_table,
330: permanent => 'no',
331: columns => [{ name => 'symb_id',
332: type => 'MEDIUMINT UNSIGNED',
333: restrictions => 'NOT NULL',
334: auto_inc => 'yes', },
335: { name => 'symb',
336: type => 'MEDIUMTEXT',
337: restrictions => 'NOT NULL'},
338: ],
339: 'PRIMARY KEY' => ['symb_id'],
340: };
341: #
342: my $part_table_def = {
343: id => $part_table,
344: permanent => 'no',
345: columns => [{ name => 'part_id',
346: type => 'MEDIUMINT UNSIGNED',
347: restrictions => 'NOT NULL',
348: auto_inc => 'yes', },
349: { name => 'part',
350: type => 'VARCHAR(100) BINARY',
351: restrictions => 'NOT NULL'},
352: ],
353: 'PRIMARY KEY' => ['part (100)'],
354: 'KEY' => [{ columns => ['part_id']},],
355: };
356: #
357: my $student_table_def = {
358: id => $student_table,
359: permanent => 'no',
360: columns => [{ name => 'student_id',
361: type => 'MEDIUMINT UNSIGNED',
362: restrictions => 'NOT NULL',
363: auto_inc => 'yes', },
364: { name => 'student',
365: type => 'VARCHAR(100) BINARY',
366: restrictions => 'NOT NULL UNIQUE'},
367: { name => 'section',
368: type => 'VARCHAR(100) BINARY',
369: restrictions => 'NOT NULL'},
370: { name => 'status',
371: type => 'VARCHAR(15) BINARY',
372: restrictions => 'NOT NULL'},
373: { name => 'classification',
374: type => 'VARCHAR(100) BINARY', },
375: { name => 'updatetime',
376: type => 'INT UNSIGNED'},
377: { name => 'fullupdatetime',
378: type => 'INT UNSIGNED'},
379: ],
380: 'PRIMARY KEY' => ['student_id'],
381: 'KEY' => [{ columns => ['student (100)',
382: 'section (100)',
383: 'status (15)',]},],
384: };
385: #
386: my $groupnames_table_def = {
387: id => $groupnames_table,
388: permanent => 'no',
389: columns => [{ name => 'group_id',
390: type => 'MEDIUMINT UNSIGNED',
391: restrictions => 'NOT NULL',
392: auto_inc => 'yes', },
393: { name => 'groupname',
394: type => 'VARCHAR(100) BINARY',
395: restrictions => 'NOT NULL UNIQUE'},
396: ],
397: 'PRIMARY KEY' => ['group_id'],
398: 'KEY' => [{ columns => ['groupname (100)',]},],
399: };
400: #
401: my $students_groups_table_def = {
402: id => $students_groups_table,
403: permanent => 'no',
404: columns => [{ name => 'student_id',
405: type => 'MEDIUMINT UNSIGNED',
406: restrictions => 'NOT NULL', },
407: { name => 'group_id',
408: type => 'MEDIUMINT UNSIGNED',
409: restrictions => 'NOT NULL', },
410: ],
411: 'PRIMARY KEY' => ['student_id','group_id'],
412: 'KEY' => [{ columns => ['student_id'] },
413: { columns => ['group_id'] },],
414: };
415: #
416: my $performance_table_def = {
417: id => $performance_table,
418: permanent => 'no',
419: columns => [{ name => 'symb_id',
420: type => 'MEDIUMINT UNSIGNED',
421: restrictions => 'NOT NULL' },
422: { name => 'student_id',
423: type => 'MEDIUMINT UNSIGNED',
424: restrictions => 'NOT NULL' },
425: { name => 'part_id',
426: type => 'MEDIUMINT UNSIGNED',
427: restrictions => 'NOT NULL' },
428: { name => 'part',
429: type => 'VARCHAR(100) BINARY',
430: restrictions => 'NOT NULL'},
431: { name => 'solved',
432: type => 'TINYTEXT' },
433: { name => 'tries',
434: type => 'SMALLINT UNSIGNED' },
435: { name => 'awarded',
436: type => 'REAL' },
437: { name => 'award',
438: type => 'TINYTEXT' },
439: { name => 'awarddetail',
440: type => 'TINYTEXT' },
441: { name => 'timestamp',
442: type => 'INT UNSIGNED'},
443: ],
444: 'PRIMARY KEY' => ['symb_id','student_id','part_id'],
445: 'KEY' => [{ columns=>['student_id'] },
446: { columns=>['symb_id'] },],
447: };
448: #
449: my $fulldump_part_table_def = {
450: id => $fulldump_part_table,
451: permanent => 'no',
452: columns => [
453: { name => 'symb_id',
454: type => 'MEDIUMINT UNSIGNED',
455: restrictions => 'NOT NULL' },
456: { name => 'part_id',
457: type => 'MEDIUMINT UNSIGNED',
458: restrictions => 'NOT NULL' },
459: { name => 'student_id',
460: type => 'MEDIUMINT UNSIGNED',
461: restrictions => 'NOT NULL' },
462: { name => 'transaction',
463: type => 'MEDIUMINT UNSIGNED',
464: restrictions => 'NOT NULL' },
465: { name => 'tries',
466: type => 'SMALLINT UNSIGNED',
467: restrictions => 'NOT NULL' },
468: { name => 'award',
469: type => 'TINYTEXT' },
470: { name => 'awarded',
471: type => 'REAL' },
472: { name => 'previous',
473: type => 'SMALLINT UNSIGNED' },
474: # { name => 'regrader',
475: # type => 'TINYTEXT' },
476: # { name => 'afterduedate',
477: # type => 'TINYTEXT' },
478: ],
479: 'PRIMARY KEY' => ['symb_id','part_id','student_id','transaction'],
480: 'KEY' => [
481: { columns=>['symb_id'] },
482: { columns=>['part_id'] },
483: { columns=>['student_id'] },
484: ],
485: };
486: #
487: my $fulldump_response_table_def = {
488: id => $fulldump_response_table,
489: permanent => 'no',
490: columns => [
491: { name => 'symb_id',
492: type => 'MEDIUMINT UNSIGNED',
493: restrictions => 'NOT NULL' },
494: { name => 'part_id',
495: type => 'MEDIUMINT UNSIGNED',
496: restrictions => 'NOT NULL' },
497: { name => 'response_id',
498: type => 'MEDIUMINT UNSIGNED',
499: restrictions => 'NOT NULL' },
500: { name => 'student_id',
501: type => 'MEDIUMINT UNSIGNED',
502: restrictions => 'NOT NULL' },
503: { name => 'transaction',
504: type => 'MEDIUMINT UNSIGNED',
505: restrictions => 'NOT NULL' },
506: { name => 'awarddetail',
507: type => 'TINYTEXT' },
508: # { name => 'message',
509: # type => 'CHAR BINARY'},
510: { name => 'response_specific',
511: type => 'TINYTEXT' },
512: { name => 'response_specific_value',
513: type => 'TINYTEXT' },
514: { name => 'response_specific_2',
515: type => 'TINYTEXT' },
516: { name => 'response_specific_value_2',
517: type => 'TINYTEXT' },
518: { name => 'submission',
519: type => 'TEXT'},
520: ],
521: 'PRIMARY KEY' => ['symb_id','part_id','response_id','student_id',
522: 'transaction'],
523: 'KEY' => [
524: { columns=>['symb_id'] },
525: { columns=>['part_id','response_id'] },
526: { columns=>['student_id'] },
527: ],
528: };
529: my $fulldump_timestamp_table_def = {
530: id => $fulldump_timestamp_table,
531: permanent => 'no',
532: columns => [
533: { name => 'symb_id',
534: type => 'MEDIUMINT UNSIGNED',
535: restrictions => 'NOT NULL' },
536: { name => 'student_id',
537: type => 'MEDIUMINT UNSIGNED',
538: restrictions => 'NOT NULL' },
539: { name => 'transaction',
540: type => 'MEDIUMINT UNSIGNED',
541: restrictions => 'NOT NULL' },
542: { name => 'timestamp',
543: type => 'INT UNSIGNED'},
544: ],
545: 'PRIMARY KEY' => ['symb_id','student_id','transaction'],
546: 'KEY' => [
547: { columns=>['symb_id'] },
548: { columns=>['student_id'] },
549: { columns=>['transaction'] },
550: ],
551: };
552: #
553: my $parameters_table_def = {
554: id => $parameters_table,
555: permanent => 'no',
556: columns => [{ name => 'symb_id',
557: type => 'MEDIUMINT UNSIGNED',
558: restrictions => 'NOT NULL' },
559: { name => 'student_id',
560: type => 'MEDIUMINT UNSIGNED',
561: restrictions => 'NOT NULL' },
562: { name => 'parameter',
563: type => 'TINYTEXT',
564: restrictions => 'NOT NULL' },
565: { name => 'value',
566: type => 'MEDIUMTEXT' },
567: ],
568: 'PRIMARY KEY' => ['symb_id','student_id','parameter (255)'],
569: };
570: #
571: my $weight_table_def = {
572: id => $weight_table,
573: permanent => 'no',
574: columns => [{ name => 'symb_id',
575: type => 'MEDIUMINT UNSIGNED',
576: restrictions => 'NOT NULL' },
577: { name => 'part_id',
578: type => 'MEDIUMINT UNSIGNED',
579: restrictions => 'NOT NULL' },
580: { name => 'weight',
581: type => 'REAL',
582: restrictions => 'NOT NULL' },
583: ],
584: 'PRIMARY KEY' => ['symb_id','part_id'],
585: };
586: #
587: # Create the tables
588: my $tableid;
589: $tableid = &Apache::lonmysql::create_table($symb_table_def);
590: if (! defined($tableid)) {
591: &Apache::lonnet::logthis("error creating symb_table: ".
592: &Apache::lonmysql::get_error());
593: return 1;
594: }
595: #
596: $tableid = &Apache::lonmysql::create_table($part_table_def);
597: if (! defined($tableid)) {
598: &Apache::lonnet::logthis("error creating part_table: ".
599: &Apache::lonmysql::get_error());
600: return 2;
601: }
602: #
603: $tableid = &Apache::lonmysql::create_table($student_table_def);
604: if (! defined($tableid)) {
605: &Apache::lonnet::logthis("error creating student_table: ".
606: &Apache::lonmysql::get_error());
607: return 3;
608: }
609: #
610: $tableid = &Apache::lonmysql::create_table($performance_table_def);
611: if (! defined($tableid)) {
612: &Apache::lonnet::logthis("error creating preformance_table: ".
613: &Apache::lonmysql::get_error());
614: return 5;
615: }
616: #
617: $tableid = &Apache::lonmysql::create_table($parameters_table_def);
618: if (! defined($tableid)) {
619: &Apache::lonnet::logthis("error creating parameters_table: ".
620: &Apache::lonmysql::get_error());
621: return 6;
622: }
623: #
624: $tableid = &Apache::lonmysql::create_table($fulldump_part_table_def);
625: if (! defined($tableid)) {
626: &Apache::lonnet::logthis("error creating fulldump_part_table: ".
627: &Apache::lonmysql::get_error());
628: return 7;
629: }
630: #
631: $tableid = &Apache::lonmysql::create_table($fulldump_response_table_def);
632: if (! defined($tableid)) {
633: &Apache::lonnet::logthis("error creating fulldump_response_table: ".
634: &Apache::lonmysql::get_error());
635: return 8;
636: }
637: $tableid = &Apache::lonmysql::create_table($fulldump_timestamp_table_def);
638: if (! defined($tableid)) {
639: &Apache::lonnet::logthis("error creating fulldump_timestamp_table: ".
640: &Apache::lonmysql::get_error());
641: return 9;
642: }
643: $tableid = &Apache::lonmysql::create_table($weight_table_def);
644: if (! defined($tableid)) {
645: &Apache::lonnet::logthis("error creating weight_table: ".
646: &Apache::lonmysql::get_error());
647: return 10;
648: }
649: $tableid = &Apache::lonmysql::create_table($groupnames_table_def);
650: if (! defined($tableid)) {
651: &Apache::lonnet::logthis("error creating groupnames_table: ".
652: &Apache::lonmysql::get_error());
653: return 11;
654: }
655: $tableid = &Apache::lonmysql::create_table($students_groups_table_def);
656: if (! defined($tableid)) {
657: &Apache::lonnet::logthis("error creating student_groups_table: ".
658: &Apache::lonmysql::get_error());
659: return 12;
660: }
661: return 0;
662: }
663:
664: ################################################
665: ################################################
666:
667: =pod
668:
669: =item &delete_caches()
670:
671: This routine drops all the tables associated with a course from the
672: MySQL database.
673:
674: Input: course id (optional, determined by environment if omitted)
675:
676: Returns: nothing
677:
678: =cut
679:
680: ################################################
681: ################################################
682: sub delete_caches {
683: my $courseid = shift;
684: $courseid = $env{'request.course.id'} if (! defined($courseid));
685: #
686: &setup_table_names($courseid);
687: #
688: my $dbh = &Apache::lonmysql::get_dbh();
689: foreach my $table (@Tables) {
690: my $command = 'DROP TABLE '.$table.';';
691: $dbh->do($command);
692: if ($dbh->err) {
693: &Apache::lonnet::logthis($command.' resulted in error: '.$dbh->errstr);
694: }
695: }
696: return;
697: }
698:
699: ################################################
700: ################################################
701:
702: =pod
703:
704: =item &get_part_id()
705:
706: Get the MySQL id of a problem part string.
707:
708: Input: $part
709:
710: Output: undef on error, integer $part_id on success.
711:
712: =item &get_part()
713:
714: Get the string describing a part from the MySQL id of the problem part.
715:
716: Input: $part_id
717:
718: Output: undef on error, $part string on success.
719:
720: =cut
721:
722: ################################################
723: ################################################
724:
725: my $have_read_part_table = 0;
726: my %ids_by_part;
727: my %parts_by_id;
728:
729: sub get_part_id {
730: my ($part) = @_;
731: $part = 0 if (! defined($part));
732: if (! $have_read_part_table) {
733: my @Result = &Apache::lonmysql::get_rows($part_table);
734: foreach (@Result) {
735: $ids_by_part{$_->[1]}=$_->[0];
736: }
737: $have_read_part_table = 1;
738: }
739: if (! exists($ids_by_part{$part})) {
740: &Apache::lonmysql::store_row($part_table,[undef,$part]);
741: undef(%ids_by_part);
742: my @Result = &Apache::lonmysql::get_rows($part_table);
743: foreach (@Result) {
744: $ids_by_part{$_->[1]}=$_->[0];
745: }
746: }
747: return $ids_by_part{$part} if (exists($ids_by_part{$part}));
748: return undef; # error
749: }
750:
751: sub get_part {
752: my ($part_id) = @_;
753: if (! exists($parts_by_id{$part_id}) ||
754: ! defined($parts_by_id{$part_id}) ||
755: $parts_by_id{$part_id} eq '') {
756: my @Result = &Apache::lonmysql::get_rows($part_table);
757: foreach (@Result) {
758: $parts_by_id{$_->[0]}=$_->[1];
759: }
760: }
761: return $parts_by_id{$part_id} if(exists($parts_by_id{$part_id}));
762: return undef; # error
763: }
764:
765: ################################################
766: ################################################
767:
768: =pod
769:
770: =item &get_symb_id()
771:
772: Get the MySQL id of a symb.
773:
774: Input: $symb
775:
776: Output: undef on error, integer $symb_id on success.
777:
778: =item &get_symb()
779:
780: Get the symb associated with a MySQL symb_id.
781:
782: Input: $symb_id
783:
784: Output: undef on error, $symb on success.
785:
786: =cut
787:
788: ################################################
789: ################################################
790:
791: my $have_read_symb_table = 0;
792: my %ids_by_symb;
793: my %symbs_by_id;
794:
795: sub get_symb_id {
796: my ($symb) = @_;
797: if (! $have_read_symb_table) {
798: my @Result = &Apache::lonmysql::get_rows($symb_table);
799: foreach (@Result) {
800: $ids_by_symb{$_->[1]}=$_->[0];
801: }
802: $have_read_symb_table = 1;
803: }
804: if (! exists($ids_by_symb{$symb})) {
805: &Apache::lonmysql::store_row($symb_table,[undef,$symb]);
806: undef(%ids_by_symb);
807: my @Result = &Apache::lonmysql::get_rows($symb_table);
808: foreach (@Result) {
809: $ids_by_symb{$_->[1]}=$_->[0];
810: }
811: }
812: return $ids_by_symb{$symb} if(exists( $ids_by_symb{$symb}));
813: return undef; # error
814: }
815:
816: sub get_symb {
817: my ($symb_id) = @_;
818: if (! exists($symbs_by_id{$symb_id}) ||
819: ! defined($symbs_by_id{$symb_id}) ||
820: $symbs_by_id{$symb_id} eq '') {
821: my @Result = &Apache::lonmysql::get_rows($symb_table);
822: foreach (@Result) {
823: $symbs_by_id{$_->[0]}=$_->[1];
824: }
825: }
826: return $symbs_by_id{$symb_id} if(exists( $symbs_by_id{$symb_id}));
827: return undef; # error
828: }
829:
830: ################################################
831: ################################################
832:
833: =pod
834:
835: =item &get_student_id()
836:
837: Get the MySQL id of a student.
838:
839: Input: $sname, $dom
840:
841: Output: undef on error, integer $student_id on success.
842:
843: =item &get_student()
844:
845: Get student username:domain associated with the MySQL student_id.
846:
847: Input: $student_id
848:
849: Output: undef on error, string $student (username:domain) on success.
850:
851: =cut
852:
853: ################################################
854: ################################################
855:
856: my $have_read_student_table = 0;
857: my %ids_by_student;
858: my %students_by_id;
859:
860: sub get_student_id {
861: my ($sname,$sdom) = @_;
862: my $student = $sname.':'.$sdom;
863: if (! $have_read_student_table) {
864: my @Result = &Apache::lonmysql::get_rows($student_table);
865: foreach (@Result) {
866: $ids_by_student{$_->[1]}=$_->[0];
867: }
868: $have_read_student_table = 1;
869: }
870: if (! exists($ids_by_student{$student})) {
871: &populate_student_table();
872: undef(%ids_by_student);
873: undef(%students_by_id);
874: my @Result = &Apache::lonmysql::get_rows($student_table);
875: foreach (@Result) {
876: $ids_by_student{$_->[1]}=$_->[0];
877: }
878: }
879: return $ids_by_student{$student} if(exists( $ids_by_student{$student}));
880: return undef; # error
881: }
882:
883: sub get_student {
884: my ($student_id) = @_;
885: if (! exists($students_by_id{$student_id}) ||
886: ! defined($students_by_id{$student_id}) ||
887: $students_by_id{$student_id} eq '') {
888: my @Result = &Apache::lonmysql::get_rows($student_table);
889: foreach (@Result) {
890: $students_by_id{$_->[0]}=$_->[1];
891: }
892: }
893: return $students_by_id{$student_id} if(exists($students_by_id{$student_id}));
894: return undef; # error
895: }
896:
897: sub populate_student_table {
898: my ($courseid) = @_;
899: if (! defined($courseid)) {
900: $courseid = $env{'request.course.id'};
901: }
902: #
903: &setup_table_names($courseid);
904: &init_dbs($courseid,0);
905: my $dbh = &Apache::lonmysql::get_dbh();
906: my $request = 'INSERT IGNORE INTO '.$student_table.
907: "(student,section,status) VALUES ";
908: my $cdom = $env{'course.'.$courseid.'.domain'};
909: my $cnum = $env{'course.'.$courseid.'.num'};
910: my $classlist = &get_classlist($cdom,$cnum);
911: my $student_count=0;
912: while (my ($student,$data) = each %$classlist) {
913: my ($section,$status) = ($data->[&CL_SECTION()],
914: $data->[&CL_STATUS()]);
915: if ($section eq '' || $section =~ /^\s*$/) {
916: $section = 'none';
917: }
918: $request .= "('".$student."','".$section."','".$status."'),";
919: $student_count++;
920: }
921: return if ($student_count == 0);
922: chop($request);
923: $dbh->do($request);
924: if ($dbh->err()) {
925: &Apache::lonnet::logthis("error ".$dbh->errstr().
926: " occured executing \n".
927: $request);
928: }
929: return;
930: }
931:
932: my $have_read_groupnames_table = 0;
933: my %ids_by_groupname;
934:
935: sub get_group_id {
936: my ($groupname) = @_;
937: if (! $have_read_groupnames_table) {
938: my @Result = &Apache::lonmysql::get_rows($groupnames_table);
939: foreach (@Result) {
940: $ids_by_groupname{$_->[1]}=$_->[0];
941: }
942: $have_read_groupnames_table = 1;
943: }
944: if (! exists($ids_by_groupname{$groupname})) {
945: &populate_groupnames_table();
946: undef(%ids_by_groupname);
947: my @Result = &Apache::lonmysql::get_rows($groupnames_table);
948: foreach (@Result) {
949: $ids_by_groupname{$_->[1]}=$_->[0];
950: }
951: }
952: if (exists($ids_by_groupname{$groupname})) {
953: return $ids_by_groupname{$groupname};
954: }
955: return undef; # error
956: }
957:
958: sub populate_groupnames_table {
959: my ($courseid) = @_;
960: if (! defined($courseid)) {
961: $courseid = $env{'request.course.id'};
962: }
963: &setup_table_names($courseid);
964: &init_dbs($courseid,0);
965: my $dbh = &Apache::lonmysql::get_dbh();
966: my $cdom = $env{'course.'.$courseid.'.domain'};
967: my $cnum = $env{'course.'.$courseid.'.num'};
968: my %curr_groups;
969: my $numgrps = &Apache::loncommon::coursegroups(\%curr_groups,$cdom,$cnum);
970: return if (!$numgrps);
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 $classlist = &get_classlist($cdom,$cnum);
1029: my ($classgroups,$studentgroups) = &get_group_memberships($classlist,
1030: $cdom,$cnum);
1031: my $record_count = 0;
1032: foreach my $student (sort(keys(%{$classgroups}))) {
1033: my $student_id = &get_student_id(split(':',$student));
1034: my @studentsgroups = &get_students_groups($student,'Active',$classgroups);
1035: if (@studentsgroups < 1) {
1036: @studentsgroups = ('none');
1037: }
1038: foreach my $groupname (@studentsgroups) {
1039: my $group_id = &get_group_id($groupname);
1040: $request .= "('".$student_id."','".$group_id."'),";
1041: $record_count++;
1042: }
1043: }
1044: return if ($record_count == 0);
1045: chop($request);
1046: $dbh->do($request);
1047: if ($dbh->err()) {
1048: &Apache::lonnet::logthis("error ".$dbh->errstr().
1049: " occured executing \n".
1050: $request);
1051: }
1052: return;
1053: }
1054:
1055: ################################################
1056: ################################################
1057:
1058: =pod
1059:
1060: =item &clear_internal_caches()
1061:
1062: Causes the internal caches used in get_student_id, get_student,
1063: get_symb_id, get_symb, get_part_id, and get_part to be undef'd.
1064:
1065: Needs to be called before the first operation with the MySQL database
1066: for a given Apache request.
1067:
1068: =cut
1069:
1070: ################################################
1071: ################################################
1072: sub clear_internal_caches {
1073: $have_read_part_table = 0;
1074: undef(%ids_by_part);
1075: undef(%parts_by_id);
1076: $have_read_symb_table = 0;
1077: undef(%ids_by_symb);
1078: undef(%symbs_by_id);
1079: $have_read_student_table = 0;
1080: undef(%ids_by_student);
1081: undef(%students_by_id);
1082: $have_read_groupnames_table = 0;
1083: undef(%ids_by_groupname);
1084: }
1085:
1086:
1087: ################################################
1088: ################################################
1089:
1090: sub symb_is_for_task {
1091: my ($symb) = @_;
1092: return ($symb =~ /\.task$/);
1093: }
1094:
1095: ################################################
1096: ################################################
1097:
1098: =pod
1099:
1100: =item &update_full_student_data($sname,$sdom,$courseid)
1101:
1102: Does a lonnet::dump on a student to populate the courses tables.
1103:
1104: Input: $sname, $sdom, $courseid
1105:
1106: Output: $returnstatus
1107:
1108: $returnstatus is a string describing any errors that occured. 'okay' is the
1109: default.
1110:
1111: This subroutine loads a students data using lonnet::dump and inserts
1112: it into the MySQL database. The inserts are done on three tables,
1113: $fulldump_response_table, $fulldump_part_table, and $fulldump_timestamp_table.
1114: The INSERT calls are made directly by this subroutine, not through lonmysql
1115: because we do a 'bulk'insert which takes advantage of MySQLs non-SQL
1116: compliant INSERT command to insert multiple rows at a time.
1117: If anything has gone wrong during this process, $returnstatus is updated with
1118: a description of the error.
1119:
1120: Once the "fulldump" tables are updated, the tables used for chart and
1121: spreadsheet (which hold only the current state of the student on their
1122: homework, not historical data) are updated. If all updates have occured
1123: successfully, $student_table is updated to reflect the time of the update.
1124:
1125: Notice we do not insert the data and immediately query it. This means it
1126: is possible for there to be data returned this first time that is not
1127: available the second time. CYA.
1128:
1129: =cut
1130:
1131: ################################################
1132: ################################################
1133: sub update_full_student_data {
1134: my ($sname,$sdom,$courseid) = @_;
1135: #
1136: # Set up database names
1137: &setup_table_names($courseid);
1138: #
1139: my $student_id = &get_student_id($sname,$sdom);
1140: my @group_ids = &get_students_groupids($student_id);
1141: my $student = $sname.':'.$sdom;
1142: #
1143: my $returnstatus = 'okay';
1144: #
1145: # Download students data
1146: my $time_of_retrieval = time;
1147: my @tmp = &Apache::lonnet::dumpstore($courseid,$sdom,$sname);
1148: if (@tmp && $tmp[0] =~ /^error/) {
1149: $returnstatus = 'error retrieving full student data';
1150: return $returnstatus;
1151: } elsif (! @tmp) {
1152: $returnstatus = 'okay: no student data';
1153: return $returnstatus;
1154: }
1155: my %studentdata = @tmp;
1156: #
1157: # Get database handle and clean out the tables
1158: my $dbh = &Apache::lonmysql::get_dbh();
1159: $dbh->do('DELETE FROM '.$fulldump_response_table.' WHERE student_id='.
1160: $student_id);
1161: $dbh->do('DELETE FROM '.$fulldump_part_table.' WHERE student_id='.
1162: $student_id);
1163: $dbh->do('DELETE FROM '.$fulldump_timestamp_table.' WHERE student_id='.
1164: $student_id);
1165: #
1166: # Parse and store the data into a form we can handle
1167: my $partdata;
1168: my $respdata;
1169: while (my ($key,$value) = each(%studentdata)) {
1170: next if ($key =~ /^(\d+):(resource$|subnum$|keys:)/);
1171: my ($transaction,$symb,$parameter) = split(':',$key);
1172: my $symb_id = &get_symb_id($symb);
1173: if ($parameter eq 'timestamp') {
1174: # We can deal with 'timestamp' right away
1175: my @timestamp_storage = ($symb_id,$student_id,
1176: $transaction,$value);
1177: my $store_command = 'INSERT IGNORE INTO '.$fulldump_timestamp_table.
1178: " VALUES ('".join("','",@timestamp_storage)."');";
1179: $dbh->do($store_command);
1180: if ($dbh->err()) {
1181: &Apache::lonnet::logthis('unable to execute '.$store_command);
1182: &Apache::lonnet::logthis($dbh->errstr());
1183: }
1184: next;
1185: } elsif ($parameter eq 'version') {
1186: next;
1187: } elsif (&symb_is_for_task($symb)) {
1188: next if ($parameter !~ /^resource\.(.*)\.(award|
1189: awarded|
1190: solved|
1191: submission|
1192: portfiles|
1193: status|
1194: version|
1195: regrader)\s*$/x);
1196: my ($version_and_part_id, $field) = ($1,$2);
1197:
1198: next if ($version_and_part_id !~ /\./
1199: && $field ne 'regrader' && $field ne 'version');
1200:
1201: my ($version, $part, $instance) =
1202: split(/\./,$version_and_part_id);
1203:
1204: #skip and instance dimension or criteria specific data
1205: next if (defined($instance)
1206: && $instance ne $field
1207: && $instance ne 'bridgetask');
1208:
1209: if (!defined($part)) {
1210: $part = $version;
1211: }
1212: my $resp_id = &get_part_id('0');
1213: my $part_id = &get_part_id($part);
1214:
1215: if ($field eq 'version') {
1216: # for tasks each version is an attempt at it thus
1217: # version -> tries
1218: $partdata->{$symb_id}{$part_id}{$transaction}{'tries'}=
1219: $value;
1220: # at new version time the record gets reset thus adding a
1221: # virtual response awarddetail of 'new_version'
1222: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific'}='status';
1223: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific_value'}='new_version';
1224:
1225: } elsif ($field eq 'award' || $field eq 'awarded'
1226: || $field eq 'solved') {
1227: $partdata->{$symb_id}{$part_id}{$transaction}{$field}=
1228: $value;
1229: } elsif ($field eq 'portfiles') {
1230: # tasks only accepts portfolio submissions
1231: $value = $dbh->quote($value);
1232: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'submission'}=$value;
1233: } elsif ($field eq 'status') {
1234: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific'}=$field;
1235: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific_value'}=$value;
1236: } elsif ($field eq 'regrader') {
1237: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific_2'}=$field;
1238: $respdata->{$symb_id}{$part_id}{$resp_id}{$transaction}{'response_specific_value_2'}=$value;
1239: }
1240: } elsif ($parameter =~ /^resource\.(.*)\.(tries|
1241: award|
1242: awarded|
1243: previous|
1244: solved|
1245: awarddetail|
1246: submission|
1247: submissiongrading|
1248: molecule)\s*$/x){
1249: # we do not have enough information to store an
1250: # entire row, so we save it up until later.
1251: my ($part_and_resp_id,$field) = ($1,$2);
1252: my ($part,$part_id,$resp,$resp_id);
1253: if ($part_and_resp_id =~ /\./) {
1254: ($part,$resp) = split(/\./,$part_and_resp_id);
1255: $part_id = &get_part_id($part);
1256: $resp_id = &get_part_id($resp);
1257: } else {
1258: $part_id = &get_part_id($part_and_resp_id);
1259: }
1260: # Deal with part specific data
1261: if ($field =~ /^(tries|award|awarded|previous)$/) {
1262: $partdata->{$symb_id}->{$part_id}->{$transaction}->{$field}=$value;
1263: }
1264: # deal with response specific data
1265: if (defined($resp_id) &&
1266: $field =~ /^(awarddetail|
1267: submission|
1268: submissiongrading|
1269: molecule)$/x) {
1270: if ($field eq 'submission') {
1271: # We have to be careful with user supplied input.
1272: # most of the time we are okay because it is escaped.
1273: # However, there is one wrinkle: submissions which end in
1274: # and odd number of '\' cause insert errors to occur.
1275: # Best trap this somehow...
1276: $value = $dbh->quote($value);
1277: }
1278: if ($field eq 'submissiongrading' ||
1279: $field eq 'molecule') {
1280: $respdata->{$symb_id}->{$part_id}->{$resp_id}->{$transaction}->{'response_specific'}=$field;
1281: $respdata->{$symb_id}->{$part_id}->{$resp_id}->{$transaction}->{'response_specific_value'}=$value;
1282: } else {
1283: $respdata->{$symb_id}->{$part_id}->{$resp_id}->{$transaction}->{$field}=$value;
1284: }
1285: }
1286: }
1287: }
1288: ##
1289: ## Store the part data
1290: my $store_command = 'INSERT IGNORE INTO '.$fulldump_part_table.
1291: ' VALUES '."\n";
1292: my $store_rows = 0;
1293: while (my ($symb_id,$hash1) = each (%$partdata)) {
1294: while (my ($part_id,$hash2) = each (%$hash1)) {
1295: while (my ($transaction,$data) = each (%$hash2)) {
1296: $store_command .= "('".join("','",$symb_id,$part_id,
1297: $student_id,
1298: $transaction,
1299: $data->{'tries'},
1300: $data->{'award'},
1301: $data->{'awarded'},
1302: $data->{'previous'})."'),";
1303: $store_rows++;
1304: }
1305: }
1306: }
1307: if ($store_rows) {
1308: chop($store_command);
1309: $dbh->do($store_command);
1310: if ($dbh->err) {
1311: $returnstatus = 'error storing part data';
1312: &Apache::lonnet::logthis('insert error '.$dbh->errstr());
1313: &Apache::lonnet::logthis("While attempting\n".$store_command);
1314: }
1315: }
1316: ##
1317: ## Store the response data
1318: $store_command = 'INSERT IGNORE INTO '.$fulldump_response_table.
1319: ' VALUES '."\n";
1320: $store_rows = 0;
1321: while (my ($symb_id,$hash1) = each (%$respdata)) {
1322: while (my ($part_id,$hash2) = each (%$hash1)) {
1323: while (my ($resp_id,$hash3) = each (%$hash2)) {
1324: while (my ($transaction,$data) = each (%$hash3)) {
1325: my $submission = $data->{'submission'};
1326: # We have to be careful with user supplied input.
1327: # most of the time we are okay because it is escaped.
1328: # However, there is one wrinkle: submissions which end in
1329: # and odd number of '\' cause insert errors to occur.
1330: # Best trap this somehow...
1331: $submission = $dbh->quote($submission);
1332: $store_command .= "('".
1333: join("','",$symb_id,$part_id,
1334: $resp_id,$student_id,
1335: $transaction,
1336: $data->{'awarddetail'},
1337: $data->{'response_specific'},
1338: $data->{'response_specific_value'},
1339: $data->{'response_specific_2'},
1340: $data->{'response_specific_value_2'}).
1341: "',".$submission."),";
1342: $store_rows++;
1343: }
1344: }
1345: }
1346: }
1347: if ($store_rows) {
1348: chop($store_command);
1349: $dbh->do($store_command);
1350: if ($dbh->err) {
1351: $returnstatus = 'error storing response data';
1352: &Apache::lonnet::logthis('insert error '.$dbh->errstr());
1353: &Apache::lonnet::logthis("While attempting\n".$store_command);
1354: }
1355: }
1356: ##
1357: ## Update the students "current" data in the performance
1358: ## and parameters tables.
1359: my ($status,undef) = &store_student_data
1360: ($sname,$sdom,$courseid,
1361: &Apache::lonnet::convert_dump_to_currentdump(\%studentdata));
1362: if ($returnstatus eq 'okay' && $status ne 'okay') {
1363: $returnstatus = 'error storing current data:'.$status;
1364: } elsif ($status ne 'okay') {
1365: $returnstatus .= ' error storing current data:'.$status;
1366: }
1367: ##
1368: ## Update the students time......
1369: if ($returnstatus eq 'okay') {
1370: &store_updatetime($student_id,$time_of_retrieval,$time_of_retrieval);
1371: if ($dbh->err) {
1372: if ($returnstatus eq 'okay') {
1373: $returnstatus = 'error updating student time';
1374: } else {
1375: $returnstatus = 'error updating student time';
1376: }
1377: }
1378: }
1379: return $returnstatus;
1380: }
1381:
1382: ################################################
1383: ################################################
1384:
1385: =pod
1386:
1387: =item &update_student_data()
1388:
1389: Input: $sname, $sdom, $courseid
1390:
1391: Output: $returnstatus, \%student_data
1392:
1393: $returnstatus is a string describing any errors that occured. 'okay' is the
1394: default.
1395: \%student_data is the data returned by a call to lonnet::currentdump.
1396:
1397: This subroutine loads a students data using lonnet::currentdump and inserts
1398: it into the MySQL database. The inserts are done on two tables,
1399: $performance_table and $parameters_table. $parameters_table holds the data
1400: that is not included in $performance_table. See the description of
1401: $performance_table elsewhere in this file. The INSERT calls are made
1402: directly by this subroutine, not through lonmysql because we do a 'bulk'
1403: insert which takes advantage of MySQLs non-SQL compliant INSERT command to
1404: insert multiple rows at a time. If anything has gone wrong during this
1405: process, $returnstatus is updated with a description of the error and
1406: \%student_data is returned.
1407:
1408: Notice we do not insert the data and immediately query it. This means it
1409: is possible for there to be data returned this first time that is not
1410: available the second time. CYA.
1411:
1412: =cut
1413:
1414: ################################################
1415: ################################################
1416: sub update_student_data {
1417: my ($sname,$sdom,$courseid) = @_;
1418: #
1419: # Set up database names
1420: &setup_table_names($courseid);
1421: #
1422: my $student_id = &get_student_id($sname,$sdom);
1423: my @group_ids = &get_students_groupids($student_id);
1424: my $student = $sname.':'.$sdom;
1425: #
1426: my $returnstatus = 'okay';
1427: #
1428: # Download students data
1429: my $time_of_retrieval = time;
1430: my @tmp = &Apache::lonnet::currentdump($courseid,$sdom,$sname);
1431: if ((scalar(@tmp) > 0) && ($tmp[0] =~ /^error:/)) {
1432: &Apache::lonnet::logthis('error getting data for '.
1433: $sname.':'.$sdom.' in course '.$courseid.
1434: ':'.$tmp[0]);
1435: $returnstatus = 'error getting data';
1436: return ($returnstatus,undef);
1437: }
1438: if (scalar(@tmp) < 1) {
1439: return ('no data',undef);
1440: }
1441: my %student_data = @tmp;
1442: my @Results = &store_student_data($sname,$sdom,$courseid,\%student_data);
1443: #
1444: # Set the students update time
1445: if ($Results[0] eq 'okay') {
1446: &store_updatetime($student_id,$time_of_retrieval);
1447: }
1448: #
1449: return @Results;
1450: }
1451:
1452: sub store_updatetime {
1453: my ($student_id,$updatetime,$fullupdatetime)=@_;
1454: my $values = '';
1455: if (defined($updatetime)) {
1456: $values = 'updatetime='.$updatetime.' ';
1457: }
1458: if (defined($fullupdatetime)) {
1459: if ($values ne '') {
1460: $values .= ',';
1461: }
1462: $values .= 'fullupdatetime='.$fullupdatetime.' ';
1463: }
1464: return if ($values eq '');
1465: my $dbh = &Apache::lonmysql::get_dbh();
1466: my $request = 'UPDATE '.$student_table.' SET '.$values.
1467: ' WHERE student_id='.$student_id.' LIMIT 1';
1468: $dbh->do($request);
1469: }
1470:
1471: sub store_student_data {
1472: my ($sname,$sdom,$courseid,$student_data) = @_;
1473: #
1474: my $student_id = &get_student_id($sname,$sdom);
1475: my @group_ids = &get_students_groupids($student_id);
1476: my $student = $sname.':'.$sdom;
1477: #
1478: my $returnstatus = 'okay';
1479: #
1480: # Remove all of the students data from the table
1481: my $dbh = &Apache::lonmysql::get_dbh();
1482: $dbh->do('DELETE FROM '.$performance_table.' WHERE student_id='.
1483: $student_id);
1484: $dbh->do('DELETE FROM '.$parameters_table.' WHERE student_id='.
1485: $student_id);
1486: #
1487: # Store away the data
1488: #
1489: my $starttime = Time::HiRes::time;
1490: my $elapsed = 0;
1491: my $rows_stored;
1492: my $store_parameters_command = 'INSERT IGNORE INTO '.$parameters_table.
1493: ' VALUES '."\n";
1494: my $num_parameters = 0;
1495: my $store_performance_command = 'INSERT IGNORE INTO '.$performance_table.
1496: ' VALUES '."\n";
1497: return ('error',undef) if (! defined($dbh));
1498: while (my ($current_symb,$param_hash) = each(%{$student_data})) {
1499: #
1500: # make sure the symb is set up properly
1501: my $symb_id = &get_symb_id($current_symb);
1502: #
1503: # Parameters
1504: while (my ($parameter,$value) = each(%$param_hash)) {
1505: if ($parameter !~ /(timestamp|resource\.(.*)\.(solved|tries|awarded|award|awarddetail|previous))/) {
1506: my $sql_parameter = "('".join("','",
1507: $symb_id,$student_id,
1508: $parameter)."',".
1509: $dbh->quote($value)."),\n";
1510: $num_parameters ++;
1511: if ($sql_parameter !~ /''/) {
1512: $store_parameters_command .= $sql_parameter;
1513: #$rows_stored++;
1514: }
1515: }
1516: }
1517: # Performance
1518: my %stored;
1519: while (my ($parameter,$value) = each(%$param_hash)) {
1520: next if ($parameter !~ /^resource\.(.*)\.(solved|awarded)$/);
1521: my $part = $1;
1522: my $which = $2;
1523: next if ($part =~ /\./);
1524: next if (exists($stored{$part}));
1525: $stored{$part}++;
1526: #
1527: my $part_id = &get_part_id($part);
1528: next if (!defined($part_id));
1529:
1530: my ($solved,$awarded);
1531: if ($which eq 'solved') {
1532: $solved = $value;
1533: $awarded = $param_hash->{'resource.'.$part.'.awarded'};
1534: } else {
1535: $solved = $param_hash->{'resource.'.$part.'.solved'};
1536: $awarded = $value;
1537: }
1538: my $award = $param_hash->{'resource.'.$part.'.award'};
1539: my $awarddetail = $param_hash->{'resource.'.$part.'.awarddetail'};
1540: my $timestamp = $param_hash->{'timestamp'};
1541: my $tries = $param_hash->{'resource.'.$part.'.tries'};
1542: if (&symb_is_for_task($current_symb)) {
1543: $tries = $param_hash->{'resource.'.$part.'.version'};
1544: }
1545: #
1546: $solved = '' if (! defined($solved));
1547: $tries = '' if (! defined($tries));
1548: $awarded = '' if (! defined($awarded));
1549: $award = '' if (! defined($award));
1550: $awarddetail = '' if (! defined($awarddetail));
1551: my $sql_performance =
1552: "('".join("','",$symb_id,$student_id,$part_id,$part,
1553: $solved,$tries,$awarded,$award,
1554: $awarddetail,$timestamp)."'),\n";
1555: $store_performance_command .= $sql_performance;
1556: $rows_stored++;
1557: }
1558: }
1559: if (! $rows_stored) { return ($returnstatus, undef); }
1560: $store_parameters_command =~ s|,\n$||;
1561: $store_performance_command =~ s|,\n$||;
1562: my $start = Time::HiRes::time;
1563: $dbh->do($store_performance_command);
1564: if ($dbh->err()) {
1565: &Apache::lonnet::logthis('performance bigass insert error:'.
1566: $dbh->errstr());
1567: &Apache::lonnet::logthis('command = '.$/.$store_performance_command);
1568: $returnstatus = 'error: unable to insert performance into database';
1569: return ($returnstatus,$student_data);
1570: }
1571: $dbh->do($store_parameters_command) if ($num_parameters>0);
1572: if ($dbh->err()) {
1573: &Apache::lonnet::logthis('parameters bigass insert error:'.
1574: $dbh->errstr());
1575: &Apache::lonnet::logthis('command = '.$/.$store_parameters_command);
1576: &Apache::lonnet::logthis('rows_stored = '.$rows_stored);
1577: &Apache::lonnet::logthis('student_id = '.$student_id);
1578: $returnstatus = 'error: unable to insert parameters into database';
1579: return ($returnstatus,$student_data);
1580: }
1581: $elapsed += Time::HiRes::time - $start;
1582: return ($returnstatus,$student_data);
1583: }
1584:
1585: ######################################
1586: ######################################
1587:
1588: =pod
1589:
1590: =item &ensure_tables_are_set_up($courseid)
1591:
1592: Checks to be sure the MySQL tables for the given class are set up.
1593: If $courseid is omitted it will be obtained from the environment.
1594:
1595: Returns nothing on success and 'error' on failure
1596:
1597: =cut
1598:
1599: ######################################
1600: ######################################
1601: sub ensure_tables_are_set_up {
1602: my ($courseid) = @_;
1603: $courseid = $env{'request.course.id'} if (! defined($courseid));
1604: #
1605: # Clean out package variables
1606: &setup_table_names($courseid);
1607: #
1608: # if the tables do not exist, make them
1609: my @CurrentTable = &Apache::lonmysql::tables_in_db();
1610: my ($found_symb,$found_student,$found_groups,$found_groupnames,$found_part,
1611: $found_performance,$found_parameters,$found_fulldump_part,
1612: $found_fulldump_response,$found_fulldump_timestamp,
1613: $found_weight);
1614: foreach (@CurrentTable) {
1615: $found_symb = 1 if ($_ eq $symb_table);
1616: $found_student = 1 if ($_ eq $student_table);
1617: $found_groups = 1 if ($_ eq $students_groups_table);
1618: $found_groupnames = 1 if ($_ eq $groupnames_table);
1619: $found_part = 1 if ($_ eq $part_table);
1620: $found_performance = 1 if ($_ eq $performance_table);
1621: $found_parameters = 1 if ($_ eq $parameters_table);
1622: $found_fulldump_part = 1 if ($_ eq $fulldump_part_table);
1623: $found_fulldump_response = 1 if ($_ eq $fulldump_response_table);
1624: $found_fulldump_timestamp = 1 if ($_ eq $fulldump_timestamp_table);
1625: $found_weight = 1 if ($_ eq $weight_table);
1626: }
1627: if (!$found_symb ||
1628: !$found_student || !$found_part ||
1629: !$found_performance || !$found_parameters ||
1630: !$found_fulldump_part || !$found_fulldump_response ||
1631: !$found_fulldump_timestamp || !$found_weight ) {
1632: if (&init_dbs($courseid,1)) {
1633: return 'error';
1634: }
1635: }
1636: }
1637:
1638: ################################################
1639: ################################################
1640:
1641: =pod
1642:
1643: =item &ensure_current_data()
1644:
1645: Input: $sname, $sdom, $courseid
1646:
1647: Output: $status, $data
1648:
1649: This routine ensures the data for a given student is up to date.
1650: The $student_table is queried to determine the time of the last update.
1651: If the students data is out of date, &update_student_data() is called.
1652: The return values from the call to &update_student_data() are returned.
1653:
1654: =cut
1655:
1656: ################################################
1657: ################################################
1658: sub ensure_current_data {
1659: my ($sname,$sdom,$courseid) = @_;
1660: my $status = 'okay'; # return value
1661: #
1662: $courseid = $env{'request.course.id'} if (! defined($courseid));
1663: &ensure_tables_are_set_up($courseid);
1664: #
1665: # Get the update time for the user
1666: my $updatetime = 0;
1667: my $modifiedtime = &Apache::lonnet::GetFileTimestamp
1668: ($sdom,$sname,$courseid.'.db',
1669: $Apache::lonnet::perlvar{'lonUsersDir'});
1670: #
1671: my $student_id = &get_student_id($sname,$sdom);
1672: my @group_ids = &get_students_groupids($student_id);
1673: my @Result = &Apache::lonmysql::get_rows($student_table,
1674: "student_id ='$student_id'");
1675: my $data = undef;
1676: if (@Result) {
1677: $updatetime = $Result[0]->[5]; # Ack! This is dumb!
1678: }
1679: if ($modifiedtime > $updatetime) {
1680: ($status,$data) = &update_student_data($sname,$sdom,$courseid);
1681: }
1682: return ($status,$data);
1683: }
1684:
1685: ################################################
1686: ################################################
1687:
1688: =pod
1689:
1690: =item &ensure_current_full_data($sname,$sdom,$courseid)
1691:
1692: Input: $sname, $sdom, $courseid
1693:
1694: Output: $status
1695:
1696: This routine ensures the fulldata (the data from a lonnet::dump, not a
1697: lonnet::currentdump) for a given student is up to date.
1698: The $student_table is queried to determine the time of the last update.
1699: If the students fulldata is out of date, &update_full_student_data() is
1700: called.
1701:
1702: The return value from the call to &update_full_student_data() is returned.
1703:
1704: =cut
1705:
1706: ################################################
1707: ################################################
1708: sub ensure_current_full_data {
1709: my ($sname,$sdom,$courseid) = @_;
1710: my $status = 'okay'; # return value
1711: #
1712: $courseid = $env{'request.course.id'} if (! defined($courseid));
1713: &ensure_tables_are_set_up($courseid);
1714: #
1715: # Get the update time for the user
1716: my $modifiedtime = &Apache::lonnet::GetFileTimestamp
1717: ($sdom,$sname,$courseid.'.db',
1718: $Apache::lonnet::perlvar{'lonUsersDir'});
1719: #
1720: my $student_id = &get_student_id($sname,$sdom);
1721: my @group_ids = &get_students_groupids($student_id);
1722: my @Result = &Apache::lonmysql::get_rows($student_table,
1723: "student_id ='$student_id'");
1724: my $updatetime;
1725: if (@Result && ref($Result[0]) eq 'ARRAY') {
1726: $updatetime = $Result[0]->[6];
1727: }
1728: if (! defined($updatetime) || $modifiedtime > $updatetime) {
1729: $status = &update_full_student_data($sname,$sdom,$courseid);
1730: }
1731: return $status;
1732: }
1733:
1734: ################################################
1735: ################################################
1736:
1737: =pod
1738:
1739: =item &get_student_data_from_performance_cache()
1740:
1741: Input: $sname, $sdom, $symb, $courseid
1742:
1743: Output: hash reference containing the data for the given student.
1744: If $symb is undef, all the students data is returned.
1745:
1746: This routine is the heart of the local caching system. See the description
1747: of $performance_table, $symb_table, $student_table, and $part_table. The
1748: main task is building the MySQL request. The tables appear in the request
1749: in the order in which they should be parsed by MySQL. When searching
1750: on a student the $student_table is used to locate the 'student_id'. All
1751: rows in $performance_table which have a matching 'student_id' are returned,
1752: with data from $part_table and $symb_table which match the entries in
1753: $performance_table, 'part_id' and 'symb_id'. When searching on a symb,
1754: the $symb_table is processed first, with matching rows grabbed from
1755: $performance_table and filled in from $part_table and $student_table in
1756: that order.
1757:
1758: Running 'EXPLAIN ' on the 'SELECT' statements generated can be quite
1759: interesting, especially if you play with the order the tables are listed.
1760:
1761: =cut
1762:
1763: ################################################
1764: ################################################
1765: sub get_student_data_from_performance_cache {
1766: my ($sname,$sdom,$symb,$courseid)=@_;
1767: my $student = $sname.':'.$sdom if (defined($sname) && defined($sdom));
1768: &setup_table_names($courseid);
1769: #
1770: # Return hash
1771: my $studentdata;
1772: #
1773: my $dbh = &Apache::lonmysql::get_dbh();
1774: my $request = "SELECT ".
1775: "d.symb,a.part,a.solved,a.tries,a.awarded,a.award,a.awarddetail,".
1776: "a.timestamp ";
1777: if (defined($student)) {
1778: $request .= "FROM $student_table AS b ".
1779: "LEFT JOIN $performance_table AS a ON b.student_id=a.student_id ".
1780: # "LEFT JOIN $part_table AS c ON c.part_id = a.part_id ".
1781: "LEFT JOIN $symb_table AS d ON d.symb_id = a.symb_id ".
1782: "WHERE student='$student'";
1783: if (defined($symb) && $symb ne '') {
1784: $request .= " AND d.symb=".$dbh->quote($symb);
1785: }
1786: } elsif (defined($symb) && $symb ne '') {
1787: $request .= "FROM $symb_table as d ".
1788: "LEFT JOIN $performance_table AS a ON d.symb_id=a.symb_id ".
1789: # "LEFT JOIN $part_table AS c ON c.part_id = a.part_id ".
1790: "LEFT JOIN $student_table AS b ON b.student_id = a.student_id ".
1791: "WHERE symb='".$dbh->quote($symb)."'";
1792: }
1793: my $starttime = Time::HiRes::time;
1794: my $rows_retrieved = 0;
1795: my $sth = $dbh->prepare($request);
1796: $sth->execute();
1797: if ($sth->err()) {
1798: &Apache::lonnet::logthis("Unable to execute MySQL request:");
1799: &Apache::lonnet::logthis("\n".$request."\n");
1800: &Apache::lonnet::logthis("error is:".$sth->errstr());
1801: return undef;
1802: }
1803: foreach my $row (@{$sth->fetchall_arrayref}) {
1804: $rows_retrieved++;
1805: my ($symb,$part,$solved,$tries,$awarded,$award,$awarddetail,$time) =
1806: (@$row);
1807: my $base = 'resource.'.$part;
1808: $studentdata->{$symb}->{$base.'.solved'} = $solved;
1809: $studentdata->{$symb}->{$base.'.tries'} = $tries;
1810: $studentdata->{$symb}->{$base.'.awarded'} = $awarded;
1811: $studentdata->{$symb}->{$base.'.award'} = $award;
1812: $studentdata->{$symb}->{$base.'.awarddetail'} = $awarddetail;
1813: $studentdata->{$symb}->{'timestamp'} = $time if (defined($time) && $time ne '');
1814: }
1815: ## Get misc parameters
1816: $request = 'SELECT c.symb,a.parameter,a.value '.
1817: "FROM $student_table AS b ".
1818: "LEFT JOIN $parameters_table AS a ON b.student_id=a.student_id ".
1819: "LEFT JOIN $symb_table AS c ON c.symb_id = a.symb_id ".
1820: "WHERE student='$student'";
1821: if (defined($symb) && $symb ne '') {
1822: $request .= " AND c.symb=".$dbh->quote($symb);
1823: }
1824: $sth = $dbh->prepare($request);
1825: $sth->execute();
1826: if ($sth->err()) {
1827: &Apache::lonnet::logthis("Unable to execute MySQL request:");
1828: &Apache::lonnet::logthis("\n".$request."\n");
1829: &Apache::lonnet::logthis("error is:".$sth->errstr());
1830: if (defined($symb) && $symb ne '') {
1831: $studentdata = $studentdata->{$symb};
1832: }
1833: return $studentdata;
1834: }
1835: #
1836: foreach my $row (@{$sth->fetchall_arrayref}) {
1837: $rows_retrieved++;
1838: my ($symb,$parameter,$value) = (@$row);
1839: $studentdata->{$symb}->{$parameter} = $value;
1840: }
1841: #
1842: if (defined($symb) && $symb ne '') {
1843: $studentdata = $studentdata->{$symb};
1844: }
1845: return $studentdata;
1846: }
1847:
1848: ################################################
1849: ################################################
1850:
1851: =pod
1852:
1853: =item &get_current_state()
1854:
1855: Input: $sname,$sdom,$symb,$courseid
1856:
1857: Output: Described below
1858:
1859: Retrieve the current status of a students performance. $sname and
1860: $sdom are the only required parameters. If $symb is undef the results
1861: of an &Apache::lonnet::currentdump() will be returned.
1862: If $courseid is undef it will be retrieved from the environment.
1863:
1864: The return structure is based on &Apache::lonnet::currentdump. If
1865: $symb is unspecified, all the students data is returned in a hash of
1866: the form:
1867: (
1868: symb1 => { param1 => value1, param2 => value2 ... },
1869: symb2 => { param1 => value1, param2 => value2 ... },
1870: )
1871:
1872: If $symb is specified, a hash of
1873: (
1874: param1 => value1,
1875: param2 => value2,
1876: )
1877: is returned.
1878:
1879: If no data is found for $symb, or if the student has no performance data,
1880: an empty list is returned.
1881:
1882: =cut
1883:
1884: ################################################
1885: ################################################
1886: sub get_current_state {
1887: my ($sname,$sdom,$symb,$courseid,$forcedownload)=@_;
1888: #
1889: $courseid = $env{'request.course.id'} if (! defined($courseid));
1890: #
1891: return () if (! defined($sname) || ! defined($sdom));
1892: #
1893: my ($status,$data) = &ensure_current_data($sname,$sdom,$courseid);
1894: # &Apache::lonnet::logthis
1895: # ('sname = '.$sname.
1896: # ' domain = '.$sdom.
1897: # ' status = '.$status.
1898: # ' data is '.(defined($data)?'defined':'undefined'));
1899: # while (my ($symb,$hash) = each(%$data)) {
1900: # &Apache::lonnet::logthis($symb."\n----------------------------------");
1901: # while (my ($key,$value) = each (%$hash)) {
1902: # &Apache::lonnet::logthis(" ".$key." = ".$value);
1903: # }
1904: # }
1905: #
1906: if (defined($data) && defined($symb) && ref($data->{$symb})) {
1907: return %{$data->{$symb}};
1908: } elsif (defined($data) && ! defined($symb) && ref($data)) {
1909: return %$data;
1910: }
1911: if ($status eq 'no data') {
1912: return ();
1913: } else {
1914: if ($status ne 'okay' && $status ne '') {
1915: &Apache::lonnet::logthis('status = '.$status);
1916: return ();
1917: }
1918: my $returnhash = &get_student_data_from_performance_cache($sname,$sdom,
1919: $symb,$courseid);
1920: return %$returnhash if (defined($returnhash));
1921: }
1922: return ();
1923: }
1924:
1925: ################################################
1926: ################################################
1927:
1928: =pod
1929:
1930: =item &get_problem_statistics()
1931:
1932: Gather data on a given problem. The database is assumed to be
1933: populated and all local caching variables are assumed to be set
1934: properly. This means you need to call &ensure_current_data for
1935: the students you are concerned with prior to calling this routine.
1936:
1937: Inputs: $Sections, Groups, $status, $symb, $part, $courseid, $starttime,
1938: $endtime
1939:
1940: =over 4
1941:
1942: =item $Sections Array ref containing section names for students.
1943: 'all' is allowed to be the first (and only) item in the array.
1944:
1945: =item $Groups Array ref containing group names for students.
1946: 'all' is allowed to be the first (and only) item in the array.
1947:
1948: =item $status String describing the status of students
1949:
1950: =item $symb is the symb for the problem.
1951:
1952: =item $part is the part id you need statistics for
1953:
1954: =item $courseid is the course id, of course!
1955:
1956: =item $starttime and $endtime are unix times which to use to limit
1957: the statistical data.
1958:
1959: =back
1960:
1961: Outputs: See the code for up to date information. A hash reference is
1962: returned. The hash has the following keys defined:
1963:
1964: =over 4
1965:
1966: =item num_students The number of students attempting the problem
1967:
1968: =item tries The total number of tries for the students
1969:
1970: =item max_tries The maximum number of tries taken
1971:
1972: =item mean_tries The average number of tries
1973:
1974: =item num_solved The number of students able to solve the problem
1975:
1976: =item num_override The number of students whose answer is 'correct_by_override'
1977:
1978: =item deg_of_diff The degree of difficulty of the problem
1979:
1980: =item std_tries The standard deviation of the number of tries
1981:
1982: =item skew_tries The skew of the number of tries
1983:
1984: =item per_wrong The number of students attempting the problem who were not
1985: able to answer it correctly.
1986:
1987: =back
1988:
1989: =cut
1990:
1991: ################################################
1992: ################################################
1993: sub get_problem_statistics {
1994: my ($Sections,$Groups,$status,$symb,$part,$courseid,$starttime,$endtime) = @_;
1995: return if (! defined($symb) || ! defined($part));
1996: $courseid = $env{'request.course.id'} if (! defined($courseid));
1997: #
1998: &setup_table_names($courseid);
1999: my $symb_id = &get_symb_id($symb);
2000: my $part_id = &get_part_id($part);
2001: my $stats_table = $courseid.'_problem_stats';
2002: #
2003: my $dbh = &Apache::lonmysql::get_dbh();
2004: return undef if (! defined($dbh));
2005: #
2006: # Clean out the table
2007: $dbh->do('DROP TABLE '.$stats_table); # May return an error
2008: my $request =
2009: 'CREATE TEMPORARY TABLE '.$stats_table.' '.
2010: 'SELECT a.student_id,a.solved,a.award,a.awarded,a.tries '.
2011: 'FROM '.$performance_table.' AS a ';
2012: #
2013: # See if we need to include some requirements on the students
2014: if ((defined($Sections) && lc($Sections->[0]) ne 'all') ||
2015: (defined($status) && lc($status) ne 'any')) {
2016: $request .= 'NATURAL LEFT JOIN '.$student_table.' AS b ';
2017: }
2018: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
2019: if (defined($groups_join)) {
2020: $request .= $groups_join;
2021: }
2022: $request .= ' WHERE a.symb_id='.$symb_id.' AND a.part_id='.$part_id;
2023: #
2024: # Limit the students included to those specified
2025: if (defined($Sections) && lc($Sections->[0]) ne 'all') {
2026: $request .= ' AND ('.
2027: join(' OR ', map { "b.section='".$_."'" } @$Sections
2028: ).')';
2029: }
2030: if (defined($status) && lc($status) ne 'any') {
2031: $request .= " AND b.status='".$status."'";
2032: }
2033: #
2034: # Limit by starttime and endtime
2035: my $time_requirements = undef;
2036: if (defined($starttime)) {
2037: $time_requirements .= 'a.timestamp>='.$starttime;
2038: if (defined($endtime)) {
2039: $time_requirements .= ' AND a.timestamp<='.$endtime;
2040: }
2041: } elsif (defined($endtime)) {
2042: $time_requirements .= 'a.timestamp<='.$endtime;
2043: }
2044: if (defined($time_requirements)) {
2045: $request .= ' AND '.$time_requirements;
2046: }
2047: # Limit by group, as required
2048: if (defined($group_limits)) {
2049: $request .= ' AND '.$group_limits;
2050: }
2051: #
2052: # Finally, execute the request to create the temporary table
2053: $dbh->do($request);
2054: #
2055: # Collect the first suite of statistics
2056: $request = 'SELECT COUNT(*),SUM(tries),'.
2057: 'AVG(tries),STD(tries) '.
2058: 'FROM '.$stats_table;
2059: my ($num,$tries,$mean,$STD) = &execute_SQL_request
2060: ($dbh,$request);
2061: #
2062: $request = 'SELECT MAX(tries),MIN(tries) FROM '.$stats_table.
2063: ' WHERE awarded>0';
2064: if (defined($time_requirements)) {
2065: $request .= ' AND '.$time_requirements;
2066: }
2067: my ($max,$min) = &execute_SQL_request($dbh,$request);
2068: #
2069: $request = 'SELECT SUM(awarded) FROM '.$stats_table;
2070: if (defined($time_requirements)) {
2071: $request .= ' AND '.$time_requirements;
2072: }
2073: my ($Solved) = &execute_SQL_request($dbh,$request);
2074: #
2075: $request = 'SELECT SUM(awarded) FROM '.$stats_table.
2076: " WHERE solved='correct_by_override'";
2077: if (defined($time_requirements)) {
2078: $request .= ' AND '.$time_requirements;
2079: }
2080: my ($solved) = &execute_SQL_request($dbh,$request);
2081: #
2082: $Solved -= $solved;
2083: #
2084: $num = 0 if (! defined($num));
2085: $tries = 0 if (! defined($tries));
2086: $max = 0 if (! defined($max));
2087: $min = 0 if (! defined($min));
2088: $STD = 0 if (! defined($STD));
2089: $Solved = 0 if (! defined($Solved) || $Solved < 0);
2090: $solved = 0 if (! defined($solved));
2091: #
2092: # Compute the more complicated statistics
2093: my $DegOfDiff = 'nan';
2094: $DegOfDiff = 1-($Solved)/$tries if ($tries>0);
2095: #
2096: my $SKEW = 'nan';
2097: my $wrongpercent = 0;
2098: my $numwrong = 'nan';
2099: if ($num > 0) {
2100: ($SKEW) = &execute_SQL_request($dbh,'SELECT SQRT(SUM('.
2101: 'POWER(tries - '.$STD.',3)'.
2102: '))/'.$num.' FROM '.$stats_table);
2103: $numwrong = $num-$Solved;
2104: $wrongpercent=int(10*100*$numwrong/$num)/10;
2105: }
2106: #
2107: # Drop the temporary table
2108: $dbh->do('DROP TABLE '.$stats_table); # May return an error
2109: #
2110: # Return result
2111: return { num_students => $num,
2112: tries => $tries,
2113: max_tries => $max,
2114: min_tries => $min,
2115: mean_tries => $mean,
2116: std_tries => $STD,
2117: skew_tries => $SKEW,
2118: num_solved => $Solved,
2119: num_override => $solved,
2120: num_wrong => $numwrong,
2121: per_wrong => $wrongpercent,
2122: deg_of_diff => $DegOfDiff };
2123: }
2124:
2125: ##
2126: ## This is a helper for get_statistics
2127: sub execute_SQL_request {
2128: my ($dbh,$request)=@_;
2129: # &Apache::lonnet::logthis($request);
2130: my $sth = $dbh->prepare($request);
2131: if (!$sth) {
2132: die($dbh->errstr . " SQL: $request");
2133: }
2134: $sth->execute();
2135: my $row = $sth->fetchrow_arrayref();
2136: if (ref($row) eq 'ARRAY' && scalar(@$row)>0) {
2137: return @$row;
2138: }
2139: return ();
2140: }
2141:
2142: ######################################################
2143: ######################################################
2144:
2145: =pod
2146:
2147: =item &populate_weight_table
2148:
2149: =cut
2150:
2151: ######################################################
2152: ######################################################
2153: sub populate_weight_table {
2154: my ($courseid) = @_;
2155: if (! defined($courseid)) {
2156: $courseid = $env{'request.course.id'};
2157: }
2158: #
2159: &setup_table_names($courseid);
2160: my $navmap = Apache::lonnavmaps::navmap->new();
2161: if (!defined($navmap)) {
2162: &Apache::lonnet::logthis('loncoursedata::populate_weight_table:'.$/.
2163: ' unable to get navmaps resource'.$/.
2164: ' '.join(' ',(caller)));
2165: return;
2166: }
2167: my @sequences = $navmap->retrieveResources(undef,
2168: sub { shift->is_map(); },1,0,1);
2169: my @resources;
2170: foreach my $seq (@sequences) {
2171: push(@resources,$navmap->retrieveResources($seq,
2172: sub {shift->is_problem();},
2173: 0,0,0));
2174: }
2175: if (! scalar(@resources)) {
2176: &Apache::lonnet::logthis('loncoursedata::populate_weight_table:'.$/.
2177: ' no resources returned for '.$courseid);
2178: return;
2179: }
2180: # Since we use lonnet::EXT to retrieve problem weights,
2181: # to ensure current data we must clear the caches out.
2182: &Apache::lonnet::clear_EXT_cache_status();
2183: my $dbh = &Apache::lonmysql::get_dbh();
2184: my $request = 'INSERT IGNORE INTO '.$weight_table.
2185: "(symb_id,part_id,weight) VALUES ";
2186: my $weight;
2187: foreach my $res (@resources) {
2188: my $symb_id = &get_symb_id($res->symb);
2189: foreach my $part (@{$res->parts}) {
2190: my $part_id = &get_part_id($part);
2191: $weight = &Apache::lonnet::EXT('resource.'.$part.'.weight',
2192: $res->symb,
2193: undef,undef,undef);
2194: if (!defined($weight) || ($weight eq '')) {
2195: $weight=1;
2196: }
2197: $request .= "('".$symb_id."','".$part_id."','".$weight."'),";
2198: }
2199: }
2200: $request =~ s/(,)$//;
2201: # &Apache::lonnet::logthis('request = '.$/.$request);
2202: $dbh->do($request);
2203: if ($dbh->err()) {
2204: &Apache::lonnet::logthis("error ".$dbh->errstr().
2205: " occured executing \n".
2206: $request);
2207: }
2208: return;
2209: }
2210:
2211: ##########################################################
2212: ##########################################################
2213:
2214: =pod
2215:
2216: =item &limit_by_start_end_times
2217:
2218: Build SQL WHERE condition which limits the data collected by the start
2219: and end times provided
2220:
2221: Inputs: $starttime, $endtime, $table
2222:
2223: Returns: $time_limits
2224:
2225: =cut
2226:
2227: ##########################################################
2228: ##########################################################
2229: sub limit_by_start_end_time {
2230: my ($starttime,$endtime,$table) = @_;
2231: my $time_requirements = undef;
2232: if (defined($starttime)) {
2233: $time_requirements .= $table.".timestamp>='".$starttime."'";
2234: if (defined($endtime)) {
2235: $time_requirements .= " AND ".$table.".timestamp<='".$endtime."'";
2236: }
2237: } elsif (defined($endtime)) {
2238: $time_requirements .= $table.".timestamp<='".$endtime."'";
2239: }
2240: return $time_requirements;
2241: }
2242:
2243: ##########################################################
2244: ##########################################################
2245:
2246: =pod
2247:
2248: =item &limit_by_section_and_status
2249:
2250: Build SQL WHERE condition which limits the data collected by section and
2251: student status.
2252:
2253: Inputs: $Sections (array ref)
2254: $enrollment (string: 'any', 'expired', 'active')
2255: $tablename The name of the table that holds the student data
2256:
2257: Returns: $student_requirements,$enrollment_requirements
2258:
2259: =cut
2260:
2261: ##########################################################
2262: ##########################################################
2263: sub limit_by_section_and_status {
2264: my ($Sections,$enrollment,$tablename) = @_;
2265: my $student_requirements = undef;
2266: if ( (defined($Sections) && $Sections->[0] ne 'all')) {
2267: $student_requirements = '('.
2268: join(' OR ', map { $tablename.".section='".$_."'" } @$Sections
2269: ).')';
2270: }
2271: my $enrollment_requirements=undef;
2272: if (defined($enrollment) && $enrollment ne 'Any') {
2273: $enrollment_requirements = $tablename.".status='".$enrollment."'";
2274: }
2275: return ($student_requirements,$enrollment_requirements);
2276: }
2277:
2278: ######################################################
2279: ######################################################
2280:
2281: =pod
2282:
2283: =item &limit_by_group
2284:
2285: Build SQL LEFT JOIN statement to include students_groups and groupnames tables and SQL WHERE condition which limits the data collected by group.
2286:
2287: Inputs: $Groups (array ref)
2288: $stutable The name of the table which holds the student data.
2289: $grptable The name of the table which maps group_id to groupname.
2290: $stugrptab The name of the table which holds student group affiliations.
2291: Returns: $groups_join,$group_limits
2292: $groups_join JOIN part of SQL statement (to include group related tables)
2293: $group_limits SQL WHERE condition limiting to requested groups
2294: =cut
2295:
2296: sub limit_by_group {
2297: my ($Groups,$stutable,$grptable,$stugrptab) = @_;
2298: my $groups_join = undef;
2299: my $group_limits = undef;
2300: if ( (defined($Groups) && $Groups->[0] ne 'all')) {
2301: $groups_join =
2302: ' LEFT JOIN '.$students_groups_table.
2303: ' AS '.$stugrptab.' ON '.
2304: $stugrptab.'.student_id = '.$stutable.'.student_id'.
2305: ' LEFT JOIN '.$groupnames_table.
2306: ' AS '.$grptable.' ON '.
2307: $stugrptab.'.group_id = '.$grptable.'.group_id ';
2308: $group_limits =
2309: ' ('.
2310: join(' OR ', map { "$grptable.groupname='".$_."'" } @$Groups
2311: ).')';
2312: }
2313: return ($groups_join,$group_limits);
2314: }
2315:
2316: =pod
2317:
2318: =item rank_students_by_scores_on_resources
2319:
2320: Inputs:
2321: $resources: array ref of hash ref. Each hash ref needs key 'symb'.
2322: $Sections: array ref of sections to include,
2323: $Groups: array ref of groups to include.
2324: $enrollment: string,
2325: $courseid (may be omitted)
2326: $starttime (may be omitted)
2327: $endtime (may be omitted)
2328: $has_award_for (may be omitted)
2329:
2330: Returns; An array of arrays. The sub arrays contain a student name and
2331: their score on the resources. $starttime and $endtime constrain the
2332: list to awards obtained during the given time limits. $has_score_on
2333: constrains the list to those students who at least attempted the
2334: resource identified by the given symb, which is used to filter out
2335: such students for statistics that would be adversely affected by such
2336: students.
2337:
2338: =cut
2339:
2340: ######################################################
2341: ######################################################
2342: sub RNK_student { return 0; };
2343: sub RNK_score { return 1; };
2344:
2345: sub rank_students_by_scores_on_resources {
2346: my ($resources,$Sections,$Groups,$enrollment,$courseid,$starttime,$endtime,
2347: $has_award_for) = @_;
2348: return if (! defined($resources) || ! ref($resources) eq 'ARRAY');
2349: if (! defined($courseid)) {
2350: $courseid = $env{'request.course.id'};
2351: }
2352: #
2353: &setup_table_names($courseid);
2354: my $dbh = &Apache::lonmysql::get_dbh();
2355: my ($section_limits,$enrollment_limits)=
2356: &limit_by_section_and_status($Sections,$enrollment,'b');
2357: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
2358: my $symb_limits = '('.join(' OR ',map {'a.symb_id='.&get_symb_id($_);
2359: } @$resources
2360: ).')';
2361: my ($award_col, $award_join, $award_clause) = ('', '', '');
2362: if ($has_award_for) {
2363: my $resource_id = &get_symb_id($has_award_for);
2364: $award_col = ", perf.awarded";
2365: $award_join = "LEFT JOIN $performance_table AS perf ON perf.symb_id"
2366: ." = $resource_id AND perf.student_id = b.student_id ";
2367: $award_clause = "AND perf.awarded IS NOT NULL";
2368: }
2369: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
2370: my $request = "SELECT b.student,SUM(a.awarded*w.weight) AS score "
2371: ."$award_col FROM $performance_table AS a ".
2372: "NATURAL LEFT JOIN $weight_table AS w ".
2373: "LEFT JOIN $student_table AS b ON a.student_id=b.student_id ".
2374: "$award_join $groups_join ";
2375: my $limits;
2376: if (defined($section_limits)) {
2377: $limits .= $section_limits.' AND ';
2378: }
2379: if (defined($enrollment_limits)) {
2380: $limits .= $enrollment_limits.' AND ';
2381: }
2382: if (defined($time_limits)) {
2383: $limits .= $time_limits.' AND ';
2384: }
2385: if ($symb_limits ne '()') {
2386: $limits .= $symb_limits.' AND ';
2387: }
2388: if (defined($group_limits)) {
2389: $limits .= $group_limits.' AND ';
2390: }
2391: if ($limits) {
2392: $limits =~ s/( AND )$//; # Remove extra conjunction
2393: $request .= "WHERE $limits";
2394: }
2395: $request .= " $award_clause GROUP BY a.student_id ORDER BY score";
2396: #&Apache::lonnet::logthis('request = '.$/.$request);
2397: my $sth = $dbh->prepare($request) or die "Can't prepare $request";
2398: $sth->execute();
2399: my $rows = $sth->fetchall_arrayref();
2400: return ($rows);
2401: }
2402:
2403: ########################################################
2404: ########################################################
2405:
2406: =pod
2407:
2408: =item &get_sum_of_scores
2409:
2410: Inputs: $resource (hash ref, needs {'symb'} key),
2411: $part, (the part id),
2412: $students (array ref, contents of array are scalars holding 'sname:sdom'),
2413: $courseid
2414:
2415: Returns: the sum of the score on the problem part over the students and the
2416: maximum possible value for the sum (taken from the weight table).
2417:
2418: =cut
2419:
2420: ########################################################
2421: ########################################################
2422: sub get_sum_of_scores {
2423: my ($symb,$part,$students,$courseid,$starttime,$endtime) = @_;
2424: if (! defined($courseid)) {
2425: $courseid = $env{'request.course.id'};
2426: }
2427: if (defined($students) &&
2428: ((@$students == 0) ||
2429: (@$students == 1 && (! defined($students->[0]) ||
2430: $students->[0] eq ''))
2431: )
2432: ){
2433: undef($students);
2434: }
2435: #
2436: &setup_table_names($courseid);
2437: my $dbh = &Apache::lonmysql::get_dbh();
2438: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
2439: my $request = 'SELECT SUM(a.awarded*w.weight),SUM(w.weight) FROM '.
2440: $performance_table.' AS a '.
2441: 'NATURAL LEFT JOIN '.$weight_table.' AS w ';
2442: $request .= 'WHERE a.symb_id='.&get_symb_id($symb).
2443: ' AND a.part_id='.&get_part_id($part);
2444: if (defined($time_limits)) {
2445: $request .= ' AND '.$time_limits;
2446: }
2447: if (defined($students)) {
2448: $request .= ' AND ('.
2449: join(' OR ',map {'a.student_id='.&get_student_id(split(':',$_));
2450: } @$students).
2451: ')';
2452: }
2453: my $sth = $dbh->prepare($request);
2454: $sth->execute();
2455: my $rows = $sth->fetchrow_arrayref();
2456: if ($dbh->err) {
2457: &Apache::lonnet::logthis('error 1 = '.$dbh->errstr());
2458: &Apache::lonnet::logthis('prepared then executed, fetchrow_arrayrefed'.
2459: $/.$request);
2460: return (undef,undef);
2461: }
2462: return ($rows->[0],$rows->[1]);
2463: }
2464:
2465: ########################################################
2466: ########################################################
2467:
2468: =pod
2469:
2470: =item &score_stats
2471:
2472: Inputs: $Sections, $enrollment, $symbs, $starttime,
2473: $endtime, $courseid
2474:
2475: $Sections, $enrollment, $starttime, $endtime, and $courseid are the same as
2476: elsewhere in this module.
2477: $symbs is an array ref of symbs
2478:
2479: Returns: minimum, maximum, mean, s.d., number of students, and maximum
2480: possible of student scores on the given resources
2481:
2482: =cut
2483:
2484: ########################################################
2485: ########################################################
2486: sub score_stats {
2487: my ($Sections,$Groups,$enrollment,$symbs,$starttime,$endtime,$courseid)=@_;
2488: if (! defined($courseid)) {
2489: $courseid = $env{'request.course.id'};
2490: }
2491: #
2492: &setup_table_names($courseid);
2493: my $dbh = &Apache::lonmysql::get_dbh();
2494: #
2495: my ($section_limits,$enrollment_limits)=
2496: &limit_by_section_and_status($Sections,$enrollment,'b');
2497: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
2498: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
2499: my @Symbids = map { &get_symb_id($_); } @{$symbs};
2500: #
2501: my $stats_table = $courseid.'_problem_stats';
2502: my $symb_restriction = join(' OR ',map {'a.symb_id='.$_;} @Symbids);
2503: my $request = 'DROP TABLE '.$stats_table;
2504: $dbh->do($request);
2505: $request =
2506: 'CREATE TEMPORARY TABLE '.$stats_table.' '.
2507: 'SELECT a.student_id,'.
2508: 'SUM(a.awarded*w.weight) AS score FROM '.
2509: $performance_table.' AS a '.
2510: 'NATURAL LEFT JOIN '.$weight_table.' AS w '.
2511: 'LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id '.
2512: $groups_join;
2513: my $limit = ' WHERE ('.$symb_restriction.')';
2514: if ($time_limits) {
2515: $limit .= ' AND '.$time_limits;
2516: }
2517: if ($section_limits) {
2518: $limit .= ' AND '.$section_limits;
2519: }
2520: if ($enrollment_limits) {
2521: $limit .= ' AND '.$enrollment_limits;
2522: }
2523: if ($group_limits) {
2524: $limit .= ' AND '.$group_limits;
2525: }
2526: $request .= $limit.' GROUP BY a.student_id';
2527: # &Apache::lonnet::logthis('request = '.$/.$request);
2528: my $sth = $dbh->prepare($request);
2529: $sth->execute();
2530: $request =
2531: 'SELECT AVG(score),STD(score),MAX(score),MIN(score),COUNT(score) '.
2532: 'FROM '.$stats_table;
2533: my ($ave,$std,$max,$min,$count) = &execute_SQL_request($dbh,$request);
2534: # &Apache::lonnet::logthis('request = '.$/.$request);
2535:
2536: $request = 'SELECT SUM(weight) FROM '.$weight_table.
2537: ' AS a WHERE ('.$symb_restriction.')';
2538: my ($max_possible) = &execute_SQL_request($dbh,$request);
2539: # &Apache::lonnet::logthis('request = '.$/.$request);
2540: return($min,$max,$ave,$std,$count,$max_possible);
2541: }
2542:
2543:
2544: ########################################################
2545: ########################################################
2546:
2547: =pod
2548:
2549: =item &count_stats
2550:
2551: Inputs: $Sections, $Groups, $enrollment, $symbs, $starttime,
2552: $endtime, $courseid
2553:
2554: $Sections, $Groups $enrollment, $starttime, $endtime, and $courseid are the
2555: same as elsewhere in this module.
2556: $symbs is an array ref of symbs
2557:
2558: Returns: minimum, maximum, mean, s.d., and number of students
2559: of the number of items correct on the given resources
2560:
2561: =cut
2562:
2563: ########################################################
2564: ########################################################
2565: sub count_stats {
2566: my ($Sections,$Groups,$enrollment,$symbs,$starttime,$endtime,$courseid)=@_;
2567: if (! defined($courseid)) {
2568: $courseid = $env{'request.course.id'};
2569: }
2570: #
2571: &setup_table_names($courseid);
2572: my $dbh = &Apache::lonmysql::get_dbh();
2573: #
2574: my ($section_limits,$enrollment_limits)=
2575: &limit_by_section_and_status($Sections,$enrollment,'b');
2576: my ($groups_join,$group_limits) = &limit_by_group($Groups,'b','c','d');
2577: my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
2578: my @Symbids = map { &get_symb_id($_); } @{$symbs};
2579: #
2580: my $stats_table = $courseid.'_problem_stats';
2581: my $symb_restriction = join(' OR ',map {'a.symb_id='.$_;} @Symbids);
2582: my $request = 'DROP TABLE '.$stats_table;
2583: $dbh->do($request);
2584: $request =
2585: 'CREATE TEMPORARY TABLE '.$stats_table.' '.
2586: 'SELECT a.student_id,'.
2587: 'SUM(a.awarded) AS count FROM '.
2588: $performance_table.' AS a '.
2589: 'LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id '.
2590: $groups_join;
2591: my $limit = ' WHERE ('.$symb_restriction.')';
2592: if ($time_limits) {
2593: $limit .= ' AND '.$time_limits;
2594: }
2595: if ($section_limits) {
2596: $limit .= ' AND '.$section_limits;
2597: }
2598: if ($enrollment_limits) {
2599: $limit .= ' AND '.$enrollment_limits;
2600: }
2601: if ($group_limits) {
2602: $limit .= ' AND '.$group_limits;
2603: }
2604: $request .= $limit.' GROUP BY a.student_id';
2605: # &Apache::lonnet::logthis('request = '.$/.$request);
2606: my $sth = $dbh->prepare($request);
2607: $sth->execute();
2608: $request =
2609: 'SELECT AVG(count),STD(count),MAX(count),MIN(count),COUNT(count) '.
2610: 'FROM '.$stats_table;
2611: my ($ave,$std,$max,$min,$count) = &execute_SQL_request($dbh,$request);
2612: # &Apache::lonnet::logthis('request = '.$/.$request);
2613: return($min,$max,$ave,$std,$count);
2614: }
2615:
2616: ######################################################
2617: ######################################################
2618:
2619: =pod
2620:
2621: =item get_student_data
2622:
2623: =cut
2624:
2625: ######################################################
2626: ######################################################
2627: sub get_student_data {
2628: my ($students,$courseid) = @_;
2629: $courseid = $env{'request.course.id'} if (! defined($courseid));
2630: &setup_table_names($courseid);
2631: my $dbh = &Apache::lonmysql::get_dbh();
2632: return undef if (! defined($dbh));
2633: my $request = 'SELECT '.
2634: 'student_id, student '.
2635: 'FROM '.$student_table;
2636: if (defined($students)) {
2637: $request .= ' WHERE ('.
2638: join(' OR ', map {'student_id='.
2639: &get_student_id($_->{'username'},
2640: $_->{'domain'})
2641: } @$students
2642: ).')';
2643: }
2644: $request.= ' ORDER BY student_id';
2645: my $sth = $dbh->prepare($request);
2646: $sth->execute();
2647: if ($dbh->err) {
2648: &Apache::lonnet::logthis('error 2 = '.$dbh->errstr());
2649: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2650: return undef;
2651: }
2652: my $dataset = $sth->fetchall_arrayref();
2653: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2654: return $dataset;
2655: }
2656: }
2657:
2658: sub RD_student_id { return 0; }
2659: sub RD_awarddetail { return 1; }
2660: sub RD_response_eval { return 2; }
2661: sub RD_response_eval_2 { return 3; }
2662: sub RD_submission { return 4; }
2663: sub RD_timestamp { return 5; }
2664: sub RD_tries { return 6; }
2665: sub RD_sname { return 7; }
2666:
2667: sub get_response_data {
2668: my ($Sections,$Groups,$enrollment,$symb,$response,$courseid) = @_;
2669: return undef if (! defined($symb) ||
2670: ! defined($response));
2671: $courseid = $env{'request.course.id'} if (! defined($courseid));
2672: #
2673: &setup_table_names($courseid);
2674: my $symb_id = &get_symb_id($symb);
2675: if (! defined($symb_id)) {
2676: &Apache::lonnet::logthis('Unable to find symb for '.$symb.' in '.$courseid);
2677: return undef;
2678: }
2679: my $response_id = &get_part_id($response);
2680: if (! defined($response_id)) {
2681: &Apache::lonnet::logthis('Unable to find id for '.$response.' in '.$courseid);
2682: return undef;
2683: }
2684: #
2685: my $dbh = &Apache::lonmysql::get_dbh();
2686: return undef if (! defined($dbh));
2687: #
2688: my ($student_requirements,$enrollment_requirements) =
2689: &limit_by_section_and_status($Sections,$enrollment,'d');
2690: my ($groups_join,$group_limits) = &limit_by_group($Groups,'d','e','f');
2691: my $request = 'SELECT '.
2692: 'a.student_id, a.awarddetail, a.response_specific_value, '.
2693: 'a.response_specific_value_2, a.submission, b.timestamp, '.
2694: 'c.tries, d.student '.
2695: 'FROM '.$fulldump_response_table.' AS a '.
2696: 'LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
2697: 'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
2698: 'a.transaction = b.transaction '.
2699: 'LEFT JOIN '.$fulldump_part_table.' AS c '.
2700: 'ON a.symb_id=c.symb_id AND a.student_id=c.student_id AND '.
2701: 'a.part_id=c.part_id AND a.transaction = c.transaction '.
2702: 'LEFT JOIN '.$student_table.' AS d '.
2703: 'ON a.student_id=d.student_id '.
2704: $groups_join;
2705: my $limit = ' WHERE '.
2706: 'a.symb_id='.$symb_id.' AND a.response_id='.$response_id;
2707: if (defined($student_requirements)) {
2708: $limit .= ' AND '.$student_requirements;
2709: }
2710: if (defined($enrollment_requirements)) {
2711: $limit .= ' AND '.$enrollment_requirements;
2712: }
2713: if (defined($group_limits)) {
2714: $limit .= ' AND '.$group_limits;
2715: }
2716: $request .= $limit.' ORDER BY b.timestamp';
2717: # &Apache::lonnet::logthis("request =\n".$request);
2718: my $sth = $dbh->prepare($request);
2719: $sth->execute();
2720: if ($dbh->err) {
2721: &Apache::lonnet::logthis('error 3 = '.$dbh->errstr());
2722: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2723: return undef;
2724: }
2725: my $dataset = $sth->fetchall_arrayref();
2726: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2727: # Clear the \'s from around the submission
2728: for (my $i =0;$i<scalar(@$dataset);$i++) {
2729: $dataset->[$i]->[3] =~ s/(\'$|^\')//g;
2730: }
2731: return $dataset;
2732: }
2733: }
2734:
2735:
2736: sub RDs_awarddetail { return 3; }
2737: sub RDs_submission { return 2; }
2738: sub RDs_timestamp { return 1; }
2739: sub RDs_tries { return 0; }
2740: sub RDs_awarded { return 4; }
2741: sub RDs_response_eval { return 5; }
2742: sub RDs_response_eval_2 { return 6; }
2743: sub RDs_part_award { return 7; }
2744:
2745: sub get_response_data_by_student {
2746: my ($student,$symb,$response,$courseid) = @_;
2747: return undef if (! defined($symb) ||
2748: ! defined($response));
2749: $courseid = $env{'request.course.id'} if (! defined($courseid));
2750: #
2751: &setup_table_names($courseid);
2752: my $symb_id = &get_symb_id($symb);
2753: my $response_id = &get_part_id($response);
2754: #
2755: my $student_id = &get_student_id($student->{'username'},
2756: $student->{'domain'});
2757: my @group_ids = &get_students_groupids($student_id);
2758: #
2759: my $dbh = &Apache::lonmysql::get_dbh();
2760: return undef if (! defined($dbh));
2761: my $request = 'SELECT '.
2762: 'c.tries, b.timestamp, a.submission, a.awarddetail, c.awarded, '.
2763: 'a.response_specific_value, a.response_specific_value_2, c.award '.
2764: 'FROM '.$fulldump_response_table.' AS a '.
2765: 'LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
2766: 'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
2767: 'a.transaction = b.transaction '.
2768: 'LEFT JOIN '.$fulldump_part_table.' AS c '.
2769: 'ON a.symb_id=c.symb_id AND a.student_id=c.student_id AND '.
2770: 'a.part_id=c.part_id AND a.transaction = c.transaction '.
2771: 'LEFT JOIN '.$student_table.' AS d '.
2772: 'ON a.student_id=d.student_id '.
2773: 'LEFT JOIN '.$performance_table.' AS e '.
2774: 'ON a.symb_id=e.symb_id AND a.part_id=e.part_id AND '.
2775: 'a.student_id=e.student_id AND c.tries=e.tries '.
2776: 'WHERE '.
2777: 'a.symb_id='.$symb_id.' AND a.response_id='.$response_id.
2778: ' AND a.student_id='.$student_id.' ORDER BY b.timestamp';
2779: # &Apache::lonnet::logthis("request =\n".$request);
2780: my $sth = $dbh->prepare($request);
2781: $sth->execute();
2782: if ($dbh->err) {
2783: &Apache::lonnet::logthis('error 4 = '.$dbh->errstr());
2784: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2785: return undef;
2786: }
2787: my $dataset = $sth->fetchall_arrayref();
2788: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2789: # Clear the \'s from around the submission
2790: for (my $i =0;$i<scalar(@$dataset);$i++) {
2791: $dataset->[$i]->[2] =~ s/(\'$|^\')//g;
2792: }
2793: return $dataset;
2794: }
2795: return undef; # error occurred
2796: }
2797:
2798: sub RT_student_id { return 0; }
2799: sub RT_awarded { return 1; }
2800: sub RT_tries { return 2; }
2801: sub RT_timestamp { return 3; }
2802:
2803: sub get_response_time_data {
2804: my ($sections,$groups,$enrollment,$symb,$part,$courseid) = @_;
2805: return undef if (! defined($symb) ||
2806: ! defined($part));
2807: $courseid = $env{'request.course.id'} if (! defined($courseid));
2808: #
2809: &setup_table_names($courseid);
2810: my $symb_id = &get_symb_id($symb);
2811: if (! defined($symb_id)) {
2812: &Apache::lonnet::logthis('Unable to find symb for '.$symb.' in '.$courseid);
2813: return undef;
2814: }
2815: my $part_id = &get_part_id($part);
2816: if (! defined($part_id)) {
2817: &Apache::lonnet::logthis('Unable to find id for '.$part.' in '.$courseid);
2818: return undef;
2819: }
2820: #
2821: my $dbh = &Apache::lonmysql::get_dbh();
2822: return undef if (! defined($dbh));
2823: my ($student_requirements,$enrollment_requirements) =
2824: &limit_by_section_and_status($sections,$enrollment,'d');
2825: my ($groups_join,$group_limits) = &limit_by_group($groups,'d','e','f');
2826: my $request = 'SELECT '.
2827: 'a.student_id, a.awarded, a.tries, b.timestamp '.
2828: 'FROM '.$fulldump_part_table.' AS a '.
2829: 'LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
2830: 'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
2831: 'a.transaction = b.transaction '.
2832: 'LEFT JOIN '.$student_table.' as d '.
2833: 'ON a.student_id=d.student_id '.
2834: $groups_join;
2835: my $limit = ' WHERE '.
2836: 'a.symb_id='.$symb_id.' AND a.part_id='.$part_id;
2837: if (defined($student_requirements)) {
2838: $limit .= ' AND '.$student_requirements;
2839: }
2840: if (defined($enrollment_requirements)) {
2841: $limit .= ' AND '.$enrollment_requirements;
2842: }
2843: if (defined($group_limits)) {
2844: $limit .= ' AND '.$group_limits;
2845: }
2846: $request .= $limit.' ORDER BY b.timestamp';
2847: # &Apache::lonnet::logthis("request =\n".$request);
2848: my $sth = $dbh->prepare($request);
2849: $sth->execute();
2850: if ($dbh->err) {
2851: &Apache::lonnet::logthis('error 5 = '.$dbh->errstr());
2852: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2853: return undef;
2854: }
2855: my $dataset = $sth->fetchall_arrayref();
2856: if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
2857: return $dataset;
2858: }
2859:
2860: }
2861:
2862: ################################################
2863: ################################################
2864:
2865: =pod
2866:
2867: =item &get_student_scores($Sections,$Groups,$Symbs,$enrollment,$courseid)
2868:
2869: =cut
2870:
2871: ################################################
2872: ################################################
2873: sub get_student_scores {
2874: my ($sections,$groups,$Symbs,$enrollment,$courseid,$starttime,$endtime) = @_;
2875: $courseid = $env{'request.course.id'} if (! defined($courseid));
2876: &setup_table_names($courseid);
2877: my $dbh = &Apache::lonmysql::get_dbh();
2878: return (undef) if (! defined($dbh));
2879: my $tmptable = $courseid.'_temp_'.time;
2880: my $request = 'DROP TABLE IF EXISTS '.$tmptable;
2881: # &Apache::lonnet::logthis('request = '.$/.$request);
2882: $dbh->do($request);
2883: #
2884: my $symb_requirements;
2885: if (defined($Symbs) && @$Symbs) {
2886: $symb_requirements = '('.
2887: join(' OR ', map{ "(a.symb_id='".&get_symb_id($_->{'symb'}).
2888: "' AND a.part_id='".&get_part_id($_->{'part'}).
2889: "')"
2890: } @$Symbs).')';
2891: }
2892: #
2893: my ($student_requirements,$enrollment_requirements) =
2894: &limit_by_section_and_status($sections,$enrollment,'b');
2895: #
2896: my ($groups_join,$group_limits) = &limit_by_group($groups,'b','d','e');
2897: my $time_requirements = &limit_by_start_end_time($starttime,$endtime,'a');
2898: ##
2899: $request = 'CREATE TEMPORARY TABLE IF NOT EXISTS '.$tmptable.
2900: ' SELECT a.student_id,SUM(a.awarded*c.weight) AS score FROM '.
2901: $performance_table.' AS a ';
2902: $request .= "LEFT JOIN ".$weight_table.' AS c ON a.symb_id=c.symb_id AND a.part_id=c.part_id ';
2903: if (defined($student_requirements) || defined($enrollment_requirements)) {
2904: $request .= ' LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id ';
2905: }
2906: if (defined($groups_join)) {
2907: $request .= $groups_join;
2908: }
2909: if (defined($symb_requirements) ||
2910: defined($student_requirements) ||
2911: defined($enrollment_requirements) ||
2912: defined($group_limits) ) {
2913: $request .= ' WHERE ';
2914: }
2915: if (defined($symb_requirements)) {
2916: $request .= $symb_requirements.' AND ';
2917: }
2918: if (defined($student_requirements)) {
2919: $request .= $student_requirements.' AND ';
2920: }
2921: if (defined($enrollment_requirements)) {
2922: $request .= $enrollment_requirements.' AND ';
2923: }
2924: if (defined($time_requirements)) {
2925: $request .= $time_requirements.' AND ';
2926: }
2927: $request =~ s/ AND $//; # Strip of the trailing ' AND '.
2928: $request .= ' GROUP BY a.student_id';
2929: # &Apache::lonnet::logthis("request = \n".$request);
2930: my $sth = $dbh->prepare($request);
2931: $sth->execute();
2932: if ($dbh->err) {
2933: &Apache::lonnet::logthis('error 6 = '.$dbh->errstr());
2934: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2935: return undef;
2936: }
2937: $request = 'SELECT score,COUNT(*) FROM '.$tmptable.' GROUP BY score';
2938: # &Apache::lonnet::logthis("request = \n".$request);
2939: $sth = $dbh->prepare($request);
2940: $sth->execute();
2941: if ($dbh->err) {
2942: &Apache::lonnet::logthis('error 7 = '.$dbh->errstr());
2943: &Apache::lonnet::logthis('prepared then executed '.$/.$request);
2944: return undef;
2945: }
2946: my $dataset = $sth->fetchall_arrayref();
2947: return $dataset;
2948: }
2949:
2950: ################################################
2951: ################################################
2952:
2953: =pod
2954:
2955: =item &setup_table_names()
2956:
2957: input: course id
2958:
2959: output: none
2960:
2961: Cleans up the package variables for local caching.
2962:
2963: =cut
2964:
2965: ################################################
2966: ################################################
2967: sub setup_table_names {
2968: my ($courseid) = @_;
2969: if (! defined($courseid)) {
2970: $courseid = $env{'request.course.id'};
2971: }
2972: #
2973: if (! defined($current_course) || $current_course ne $courseid) {
2974: # Clear out variables
2975: $have_read_part_table = 0;
2976: undef(%ids_by_part);
2977: undef(%parts_by_id);
2978: $have_read_symb_table = 0;
2979: undef(%ids_by_symb);
2980: undef(%symbs_by_id);
2981: $have_read_student_table = 0;
2982: undef(%ids_by_student);
2983: undef(%students_by_id);
2984: $have_read_groupnames_table = 0;
2985: undef(%ids_by_groupname);
2986: #
2987: $current_course = $courseid;
2988: }
2989: #
2990: # Set up database names
2991: my $base_id = $courseid;
2992: $symb_table = $base_id.'_'.'symb';
2993: $part_table = $base_id.'_'.'part';
2994: $student_table = $base_id.'_'.'student';
2995: $groupnames_table = $base_id.'_'.'groupnames';
2996: $students_groups_table = $base_id.'_'.'studentgroups';
2997: $performance_table = $base_id.'_'.'performance';
2998: $parameters_table = $base_id.'_'.'parameters';
2999: $fulldump_part_table = $base_id.'_'.'partdata';
3000: $fulldump_response_table = $base_id.'_'.'responsedata';
3001: $fulldump_timestamp_table = $base_id.'_'.'timestampdata';
3002: $weight_table = $base_id.'_'.'weight';
3003: #
3004: @Tables = (
3005: $symb_table,
3006: $part_table,
3007: $student_table,
3008: $groupnames_table,
3009: $students_groups_table,
3010: $performance_table,
3011: $parameters_table,
3012: $fulldump_part_table,
3013: $fulldump_response_table,
3014: $fulldump_timestamp_table,
3015: $weight_table,
3016: );
3017: return;
3018: }
3019:
3020: ################################################
3021: ################################################
3022:
3023: =pod
3024:
3025: =back
3026:
3027: =item End of Local Data Caching Subroutines
3028:
3029: =cut
3030:
3031: ################################################
3032: ################################################
3033:
3034: } # End scope of table identifiers
3035:
3036: ################################################
3037: ################################################
3038:
3039: =pod
3040:
3041: =head3 Classlist Subroutines
3042:
3043: =item &get_classlist();
3044:
3045: Retrieve the classist of a given class or of the current class. Student
3046: information is returned from the classlist.db file and, if needed,
3047: from the students environment.
3048:
3049: Optional arguments are $cdom, and $cnum (course domain,
3050: and course number, respectively). If either is ommitted the course
3051: will be taken from the current environment ($env{'request.course.id'},
3052: $env{'course.'.$cid.'.domain'}, and $env{'course.'.$cid.'.num'}).
3053:
3054: Returns a reference to a hash which contains:
3055: keys '$sname:$sdom'
3056: values [$sdom,$sname,$end,$start,$id,$section,$fullname,$status,$type,$lockedtype]
3057:
3058: The constant values CL_SDOM, CL_SNAME, CL_END, etc. can be used
3059: as indices into the returned list to future-proof clients against
3060: changes in the list order.
3061:
3062: =cut
3063:
3064: ################################################
3065: ################################################
3066:
3067: sub CL_SDOM { return 0; }
3068: sub CL_SNAME { return 1; }
3069: sub CL_END { return 2; }
3070: sub CL_START { return 3; }
3071: sub CL_ID { return 4; }
3072: sub CL_SECTION { return 5; }
3073: sub CL_FULLNAME { return 6; }
3074: sub CL_STATUS { return 7; }
3075: sub CL_TYPE { return 8; }
3076: sub CL_LOCKEDTYPE { return 9; }
3077:
3078: sub get_classlist {
3079: my ($cdom,$cnum) = @_;
3080: my $cid = $cdom.'_'.$cnum;
3081: if (!defined($cdom) || !defined($cnum)) {
3082: $cid = $env{'request.course.id'};
3083: $cdom = $env{'course.'.$cid.'.domain'};
3084: $cnum = $env{'course.'.$cid.'.num'};
3085: }
3086: my $now = time;
3087: #
3088: my %classlist=&Apache::lonnet::dump('classlist',$cdom,$cnum);
3089: while (my ($student,$info) = each(%classlist)) {
3090: if ($student =~ /^(con_lost|error|no_such_host)/i) {
3091: &Apache::lonnet::logthis('get_classlist error for '.$cid.':'.$student);
3092: return undef;
3093: }
3094: my ($sname,$sdom) = split(/:/,$student);
3095: my @Values = split(/:/,$info);
3096: my ($end,$start,$id,$section,$fullname,$type,$lockedtype);
3097: if (@Values > 2) {
3098: ($end,$start,$id,$section,$fullname,$type,$lockedtype) = @Values;
3099: } else { # We have to get the data ourselves
3100: ($end,$start) = @Values;
3101: $section = &Apache::lonnet::getsection($sdom,$sname,$cid);
3102: my %info=&Apache::lonnet::get('environment',
3103: ['firstname','middlename',
3104: 'lastname','generation','id'],
3105: $sdom, $sname);
3106: my ($tmp) = keys(%info);
3107: if ($tmp =~/^(con_lost|error|no_such_host)/i) {
3108: $fullname = 'not available';
3109: $id = 'not available';
3110: &Apache::lonnet::logthis('unable to retrieve environment '.
3111: 'for '.$sname.':'.$sdom);
3112: } else {
3113: $fullname = &Apache::lonnet::format_name(@info{qw/firstname middlename lastname generation/},'lastname');
3114: $id = $info{'id'};
3115: }
3116: # Update the classlist with this students information
3117: if ($fullname ne 'not available') {
3118: my $enrolldata = join(':',$end,$start,$id,$section,$fullname);
3119: my $reply=&Apache::lonnet::cput('classlist',
3120: {$student => $enrolldata},
3121: $cdom,$cnum);
3122: if ($reply !~ /^(ok|delayed)/) {
3123: &Apache::lonnet::logthis('Unable to update classlist for '.
3124: 'student '.$sname.':'.$sdom.
3125: ' error:'.$reply);
3126: }
3127: }
3128: }
3129: my $status='Expired';
3130: if(((!$end) || $now < $end) && ((!$start) || ($now > $start))) {
3131: $status='Active';
3132: }
3133: $classlist{$student} =
3134: [$sdom,$sname,$end,$start,$id,$section,$fullname,$status,$type,$lockedtype];
3135: }
3136: if (wantarray()) {
3137: return (\%classlist,['domain','username','end','start','id',
3138: 'section','fullname','status','type','lockedtype']);
3139: } else {
3140: return \%classlist;
3141: }
3142: }
3143:
3144: sub get_group_memberships {
3145: my ($classlist,$cdom,$cnum) = @_;
3146: my $cid = $cdom.'_'.$cnum;
3147: if (!defined($cdom) || !defined($cnum)) {
3148: $cid = $env{'request.course.id'};
3149: $cdom = $env{'course.'.$cid.'.domain'};
3150: $cnum = $env{'course.'.$cid.'.num'};
3151: }
3152: my (%classgroups,%studentgroups);
3153: my $now = time;
3154: my $access_end = $env{'course.'.$cid.'.default_enrollment_end_date'};
3155: my (%curr_groups,%groupmemberhash);
3156: my $numgroups = &Apache::loncommon::coursegroups(\%curr_groups,$cdom,
3157: $cnum);
3158: if ($numgroups) {
3159: %groupmemberhash = &Apache::lonnet::get_group_membership($cdom,$cnum);
3160: foreach my $student (keys(%{$classlist})) {
3161: %{$classgroups{$student}} = ();
3162: my $hasgroup = 0;
3163: foreach my $status ('previous','future','active','aftercourse') {
3164: %{$classgroups{$student}{$status}} = ();
3165: }
3166: foreach my $group (keys(%curr_groups)) {
3167: if (defined($groupmemberhash{$group.':'.$student})) {
3168: my ($end,$start) = split(/:/,$groupmemberhash{$group.':'.
3169: $student});
3170: if ($start == -1) {
3171: next;
3172: } else {
3173: $studentgroups{$group} ++;
3174: $hasgroup = 1;
3175: if ($end && $end < $now) {
3176: $classgroups{$student}{'previous'}{$group} =
3177: $groupmemberhash{$group.':'.$student};
3178: if ($classlist->{$student}[&CL_STATUS()] eq 'Expired') {
3179: if ($access_end && $access_end < $now) {
3180: if ($access_end - $end < 86400) {
3181: $classgroups{$student}{'aftercourse'}{$group} = $groupmemberhash{$group.':'.$student};
3182: }
3183: }
3184: }
3185: } elsif ($now > $start) {
3186: if (!$end || $end > $now) {
3187: $classgroups{$student}{'active'}{$group} =
3188: $groupmemberhash{$group.':'.$student};
3189: }
3190: } else {
3191: $classgroups{$student}{'future'}{$group} =
3192: $groupmemberhash{$group.':'.$student};
3193: }
3194: }
3195: }
3196: }
3197: if (!$hasgroup) {
3198: $studentgroups{'none'} ++;
3199: }
3200: }
3201: }
3202: return (\%classgroups,\%studentgroups);
3203: }
3204:
3205: sub get_students_groups {
3206: my ($student,$enrollment_status,$classgroups) = @_;
3207: my @studentsgroups = ();
3208: if (ref($$classgroups{$student}{'active'}) eq 'HASH') {
3209: push(@studentsgroups,keys(%{$$classgroups{$student}{'active'}}));
3210: }
3211: if ($enrollment_status eq 'Any') {
3212: foreach my $status ('previous','future') {
3213: if (ref($$classgroups{$student}{$status}) eq 'HASH') {
3214: push(@studentsgroups,keys(%{$$classgroups{$student}{$status}}));
3215: }
3216: }
3217: } else {
3218: if (ref($$classgroups{$student}{'aftercourse'}) eq 'HASH') {
3219: push(@studentsgroups,keys(%{$$classgroups{$student}{'aftercourse'}}));
3220: }
3221: }
3222: return @studentsgroups;
3223: }
3224:
3225:
3226: # ----- END HELPER FUNCTIONS --------------------------------------------
3227:
3228: 1;
3229: __END__
3230:
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