Annotation of loncom/metadata_database/LONCAPA/lonmetadata.pm, revision 1.9
1.1 matthew 1: # The LearningOnline Network with CAPA
2: #
1.9 ! matthew 3: # $Id: lonmetadata.pm,v 1.8 2004/04/16 21:43:56 matthew Exp $
1.1 matthew 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: package LONCAPA::lonmetadata;
30:
31: use strict;
32: use DBI;
33:
34: ######################################################################
35: ######################################################################
36:
37: =pod
38:
39: =head1 Name
40:
41: lonmetadata
42:
43: =head1 Synopsis
44:
45: lonmetadata holds a description of the metadata table and provides
46: wrappers for the storage and retrieval of metadata to/from the database.
47:
48: =head1 Description
49:
50: =head1 Methods
51:
52: =over 4
53:
54: =cut
55:
56: ######################################################################
57: ######################################################################
58:
59: =pod
60:
61: =item Old table creation command
62:
63: CREATE TABLE IF NOT EXISTS metadata
64: (title TEXT,
65: author TEXT,
66: subject TEXT,
67: url TEXT,
68: keywords TEXT,
69: version TEXT,
70: notes TEXT,
71: abstract TEXT,
72: mime TEXT,
73: language TEXT,
74: creationdate DATETIME,
75: lastrevisiondate DATETIME,
76: owner TEXT,
77: copyright TEXT,
78:
79: FULLTEXT idx_title (title),
80: FULLTEXT idx_author (author),
81: FULLTEXT idx_subject (subject),
82: FULLTEXT idx_url (url),
83: FULLTEXT idx_keywords (keywords),
84: FULLTEXT idx_version (version),
85: FULLTEXT idx_notes (notes),
86: FULLTEXT idx_abstract (abstract),
87: FULLTEXT idx_mime (mime),
88: FULLTEXT idx_language (language),
89: FULLTEXT idx_owner (owner),
90: FULLTEXT idx_copyright (copyright))
91:
92: TYPE=MYISAM;
93:
94: =cut
95:
96: ######################################################################
97: ######################################################################
98: my @Metadata_Table_Description =
99: (
100: { name => 'title', type=>'TEXT'},
101: { name => 'author', type=>'TEXT'},
102: { name => 'subject', type=>'TEXT'},
103: { name => 'url', type=>'TEXT', restrictions => 'NOT NULL' },
104: { name => 'keywords', type=>'TEXT'},
105: { name => 'version', type=>'TEXT'},
106: { name => 'notes', type=>'TEXT'},
107: { name => 'abstract', type=>'TEXT'},
108: { name => 'mime', type=>'TEXT'},
109: { name => 'language', type=>'TEXT'},
110: { name => 'creationdate', type=>'DATETIME'},
111: { name => 'lastrevisiondate', type=>'DATETIME'},
112: { name => 'owner', type=>'TEXT'},
113: { name => 'copyright', type=>'TEXT'},
114: #--------------------------------------------------
115: { name => 'dependencies', type=>'TEXT'},
116: { name => 'modifyinguser', type=>'TEXT'},
117: { name => 'authorspace', type=>'TEXT'},
118: { name => 'lowestgradelevel', type=>'INT'},
119: { name => 'highestgradelevel', type=>'INT'},
120: { name => 'standards', type=>'TEXT'},
121: { name => 'count', type=>'INT'},
122: { name => 'course', type=>'INT'},
123: { name => 'course_list', type=>'TEXT'},
124: { name => 'goto', type=>'INT'},
125: { name => 'goto_list', type=>'TEXT'},
126: { name => 'comefrom', type=>'INT'},
127: { name => 'comefrom_list', type=>'TEXT'},
128: { name => 'sequsage', type=>'INT'},
129: { name => 'sequsage_list', type=>'TEXT'},
130: { name => 'stdno', type=>'INT'},
131: { name => 'stdno_list', type=>'TEXT'},
132: { name => 'avetries', type=>'FLOAT'},
133: { name => 'avetries_list', type=>'TEXT'},
134: { name => 'difficulty', type=>'FLOAT'},
135: { name => 'difficulty_list',type=>'TEXT'},
1.9 ! matthew 136: { name => 'disc', type=>'FLOAT'},
! 137: { name => 'disc_list', type=>'TEXT'},
1.1 matthew 138: { name => 'clear', type=>'FLOAT'},
139: { name => 'technical', type=>'FLOAT'},
140: { name => 'correct', type=>'FLOAT'},
141: { name => 'helpful', type=>'FLOAT'},
142: { name => 'depth', type=>'FLOAT'},
143: { name => 'hostname', type=> 'TEXT'},
144: #--------------------------------------------------
145: );
146:
147: my @Fulltext_indicies = qw/
148: title
149: author
150: subject
151: url
152: keywords
153: version
154: notes
155: abstract
156: mime
157: language
158: owner
159: copyright/;
160:
161: ######################################################################
162: ######################################################################
163:
164: =pod
165:
166: =item &describe_metadata_storage
167:
168: Input: None
169:
1.2 matthew 170: Returns: An array of hash references describing the columns and indicies
171: of the metadata table(s).
1.1 matthew 172:
173: =cut
174:
175: ######################################################################
176: ######################################################################
177: sub describe_metadata_storage {
178: return (\@Metadata_Table_Description,\@Fulltext_indicies);
179: }
180:
181: ######################################################################
182: ######################################################################
183:
184: =pod
185:
186: =item create_metadata_storage()
187:
1.3 matthew 188: Inputs: table name (optional): the name of the table. Default is 'metadata'.
1.1 matthew 189:
190: Returns: A perl string which, when executed by MySQL, will cause the
191: metadata storage to be initialized.
192:
193: =cut
194:
195: ######################################################################
196: ######################################################################
197: sub create_metadata_storage {
1.3 matthew 198: my ($tablename) = @_;
199: $tablename = 'metadata' if (! defined($tablename));
1.1 matthew 200: my $request = "CREATE TABLE IF NOT EXISTS ".$tablename." ";
201: #
202: # Process the columns (this code is stolen from lonmysql.pm)
203: my @Columns;
204: my $col_des; # mysql column description
205: foreach my $coldata (@Metadata_Table_Description) {
206: my $column = $coldata->{'name'};
207: $col_des = '';
208: if (lc($coldata->{'type'}) =~ /(enum|set)/) { # 'enum' or 'set'
209: $col_des.=$column." ".$coldata->{'type'}."('".
210: join("', '",@{$coldata->{'values'}})."')";
211: } else {
212: $col_des.=$column." ".$coldata->{'type'};
213: if (exists($coldata->{'size'})) {
214: $col_des.="(".$coldata->{'size'}.")";
215: }
216: }
217: # Modifiers
218: if (exists($coldata->{'restrictions'})){
219: $col_des.=" ".$coldata->{'restrictions'};
220: }
221: if (exists($coldata->{'default'})) {
222: $col_des.=" DEFAULT '".$coldata->{'default'}."'";
223: }
224: $col_des.=' AUTO_INCREMENT' if (exists($coldata->{'auto_inc'}) &&
225: ($coldata->{'auto_inc'} eq 'yes'));
226: $col_des.=' PRIMARY KEY' if (exists($coldata->{'primary_key'}) &&
227: ($coldata->{'primary_key'} eq 'yes'));
228: } continue {
229: # skip blank items.
230: push (@Columns,$col_des) if ($col_des ne '');
231: }
232: foreach my $colname (@Fulltext_indicies) {
233: my $text = 'FULLTEXT idx_'.$colname.' ('.$colname.')';
234: push (@Columns,$text);
235: }
1.3 matthew 236: $request .= "(".join(", ",@Columns).") TYPE=MyISAM";
1.1 matthew 237: return $request;
238: }
239:
240: ######################################################################
241: ######################################################################
242:
243: =pod
244:
245: =item store_metadata()
246:
1.4 matthew 247: Inputs: database handle ($dbh), a table name, and a hash or hash reference
248: containing the metadata for a single resource.
1.1 matthew 249:
250: Returns: 1 on success, 0 on failure to store.
251:
252: =cut
253:
254: ######################################################################
255: ######################################################################
1.2 matthew 256: {
257: ##
258: ## WARNING: The following cleverness may cause trouble in cases where
259: ## the dbi connection is dropped and recreated - a stale statement
260: ## handler may linger around and cause trouble.
261: ##
262: ## In most scripts, this will work fine. If the dbi is going to be
263: ## dropped and (possibly) later recreated, call &clear_sth. Yes it
264: ## is annoying but $sth appearantly does not have a link back to the
265: ## $dbh, so we can't check our validity.
266: ##
267: my $sth = undef;
1.4 matthew 268: my $sth_table = undef;
1.2 matthew 269:
270: sub create_statement_handler {
271: my $dbh = shift();
1.4 matthew 272: my $tablename = shift();
273: $tablename = 'metadata' if (! defined($tablename));
274: $sth_table = $tablename;
275: my $request = 'INSERT INTO '.$tablename.' VALUES(';
1.2 matthew 276: foreach (@Metadata_Table_Description) {
277: $request .= '?,';
278: }
279: chop $request;
280: $request.= ')';
281: $sth = $dbh->prepare($request);
282: return;
283: }
284:
1.4 matthew 285: sub clear_sth { $sth=undef; $sth_table=undef;}
1.2 matthew 286:
1.1 matthew 287: sub store_metadata {
1.2 matthew 288: my $dbh = shift();
1.4 matthew 289: my $tablename = shift();
1.2 matthew 290: my $errors = '';
1.4 matthew 291: if (! defined($sth) ||
292: ( defined($tablename) && ($sth_table ne $tablename)) ||
293: (! defined($tablename) && $sth_table ne 'metadata')) {
294: &create_statement_handler($dbh,$tablename);
1.2 matthew 295: }
296: my $successcount = 0;
297: while (my $mdata = shift()) {
298: next if (ref($mdata) ne "HASH");
299: my @MData;
300: foreach my $field (@Metadata_Table_Description) {
301: if (exists($mdata->{$field->{'name'}})) {
1.5 matthew 302: if ($mdata->{$field->{'name'}} eq 'nan') {
303: push(@MData,'NULL');
304: } else {
305: push(@MData,$mdata->{$field->{'name'}});
306: }
1.2 matthew 307: } else {
308: push(@MData,undef);
309: }
310: }
311: $sth->execute(@MData);
312: if (! $sth->err) {
313: $successcount++;
314: } else {
315: $errors = join(',',$errors,$sth->errstr);
316: }
317: }
318: if (wantarray()) {
319: return ($successcount,$errors);
320: } else {
321: return $successcount;
322: }
323: }
1.1 matthew 324:
325: }
326:
327: ######################################################################
328: ######################################################################
329:
330: =pod
331:
332: =item lookup_metadata()
333:
334: Inputs: database handle ($dbh) and a hash or hash reference containing
335: metadata which will be used for a search.
336:
1.2 matthew 337: Returns: scalar with error string on failure, array reference on success.
338: The array reference is the same one returned by $sth->fetchall_arrayref().
1.1 matthew 339:
340: =cut
341:
342: ######################################################################
343: ######################################################################
1.2 matthew 344: sub lookup_metadata {
345: my ($dbh,$condition,$fetchparameter) = @_;
346: my $error;
347: my $returnvalue=[];
348: my $request = 'SELECT * FROM metadata';
349: if (defined($condition)) {
350: $request .= ' WHERE '.$condition;
351: }
352: my $sth = $dbh->prepare($request);
353: if ($sth->err) {
354: $error = $sth->errstr;
355: }
356: if (! $error) {
357: $sth->execute();
358: if ($sth->err) {
359: $error = $sth->errstr;
360: } else {
361: $returnvalue = $sth->fetchall_arrayref($fetchparameter);
362: if ($sth->err) {
363: $error = $sth->errstr;
364: }
365: }
366: }
367: return ($error,$returnvalue);
368: }
1.1 matthew 369:
370: ######################################################################
371: ######################################################################
372:
373: =pod
374:
375: =item delete_metadata()
376:
1.6 matthew 377: Not implemented yet
1.1 matthew 378:
379: =cut
380:
381: ######################################################################
382: ######################################################################
383: sub delete_metadata {}
384:
385: ######################################################################
386: ######################################################################
1.5 matthew 387:
1.6 matthew 388: =pod
389:
390: =item metdata_col_to_hash
391:
392: Input: Array of metadata columns
393:
394: Return: Hash with the metadata columns as keys and the array elements
395: passed in as values
396:
397: =cut
398:
399: ######################################################################
400: ######################################################################
401: sub metadata_col_to_hash {
402: my @cols=@_;
403: my %hash=();
404: for (my $i=0; $i<=$#Metadata_Table_Description;$i++) {
405: $hash{$Metadata_Table_Description[$i]->{'name'}}=$cols[$i];
406: }
407: return %hash;
408: }
1.5 matthew 409:
410: ######################################################################
411: ######################################################################
412:
413: =pod
414:
1.8 matthew 415: =item nohist_resevaldata.db data structure
416:
417: The nohist_resevaldata.db file has the following possible keys:
418:
419: Statistics Data (values are integers, perl times, or real numbers)
420: ------------------------------------------
421: $course___$resource___avetries
422: $course___$resource___count
423: $course___$resource___difficulty
424: $course___$resource___stdno
425: $course___$resource___timestamp
426:
427: Evaluation Data (values are on a 1 to 5 scale)
428: ------------------------------------------
429: $username@$dom___$resource___clear
430: $username@$dom___$resource___comments
431: $username@$dom___$resource___depth
432: $username@$dom___$resource___technical
433: $username@$dom___$resource___helpful
434:
435: Course Context Data
436: ------------------------------------------
437: $course___$resource___course course id
438: $course___$resource___comefrom resource preceeding this resource
439: $course___$resource___goto resource following this resource
440: $course___$resource___usage resource containing this resource
441:
442: New statistical data storage
443: ------------------------------------------
444: $course&$sec&$numstud___$resource___stats
445: $sec is a string describing the sections: all, 1 2, 1 2 3,...
446: Value is a '&' deliminated list of key=value pairs.
447: Possible keys are (currently) disc,course,sections,difficulty,
448: stdno, timestamp
449:
450: =cut
451:
452: ######################################################################
453: ######################################################################
454:
455: =pod
456:
1.5 matthew 457: =item &process_reseval_data
458:
459: Process a nohist_resevaldata hash into a more complex data structure.
460:
461: Input: Hash reference containing reseval data
462:
463: Returns: Hash with the following structure:
464:
465: $hash{$url}->{'statistics'}->{$courseid}->{'avetries'} = $value
466: $hash{$url}->{'statistics'}->{$courseid}->{'count'} = $value
467: $hash{$url}->{'statistics'}->{$courseid}->{'difficulty'} = $value
468: $hash{$url}->{'statistics'}->{$courseid}->{'stdno'} = $value
469: $hash{$url}->{'statistics'}->{$courseid}->{'timestamp'} = $value
470:
471: $hash{$url}->{'evaluation'}->{$username}->{'clear'} = $value
472: $hash{$url}->{'evaluation'}->{$username}->{'comments'} = $value
473: $hash{$url}->{'evaluation'}->{$username}->{'depth'} = $value
474: $hash{$url}->{'evaluation'}->{$username}->{'technical'} = $value
475: $hash{$url}->{'evaluation'}->{$username}->{'helpful'} = $value
476:
477: $hash{$url}->{'course'} = \@Courses
478: $hash{$url}->{'comefrom'} = \@Resources
479: $hash{$url}->{'goto'} = \@Resources
480: $hash{$url}->{'usage'} = \@Resources
481:
482: $hash{$url}->{'stats'}->{$courseid\_$section}->{$key} = $value
483:
484: =cut
485:
486: ######################################################################
487: ######################################################################
488: sub process_reseval_data {
489: my ($evaldata) = @_;
490: my %DynamicData;
491: #
492: # Process every stored element
493: while (my ($storedkey,$value) = each(%{$evaldata})) {
494: my ($source,$file,$type) = split('___',$storedkey);
495: $source = &unescape($source);
496: $file = &unescape($file);
497: $value = &unescape($value);
498: " got ".$file."\n ".$type." ".$source."\n";
499: if ($type =~ /^(avetries|count|difficulty|stdno|timestamp)$/) {
500: #
501: # Statistics: $source is course id
502: $DynamicData{$file}->{'statistics'}->{$source}->{$type}=$value;
503: } elsif ($type =~ /^(clear|comments|depth|technical|helpful)$/){
504: #
505: # Evaluation $source is username, check if they evaluated it
506: # more than once. If so, pad the entry with a space.
507: while(exists($DynamicData{$file}->{'evaluation'}->{$type}->{$source})) {
508: $source .= ' ';
509: }
510: $DynamicData{$file}->{'evaluation'}->{$type}->{$source}=$value;
511: } elsif ($type =~ /^(course|comefrom|goto|usage)$/) {
512: #
513: # Context $source is course id or resource
514: push(@{$DynamicData{$file}->{$type}},&unescape($source));
515: } elsif ($type eq 'stats') {
516: #
517: # Statistics storage...
518: # $source is $cid\_$sec\_$stdno
519: # $value is stat1=value&stat2=value&stat3=value,....
520: #
1.8 matthew 521: my ($cid,$sec,$stdno)=split('&',$source);
522: my $crssec = $cid.'&'.$sec;
1.5 matthew 523: my @Data = split('&',$value);
524: my %Statistics;
525: while (my ($key,$value) = split('=',pop(@Data))) {
526: $Statistics{$key} = $value;
527: }
1.8 matthew 528: $sec =~ s:("$|^")::g;
529: $Statistics{'sections'} = $sec;
1.5 matthew 530: #
531: # Only store the data if the number of students is greater
532: # than the data already stored
533: if (! exists($DynamicData{$file}->{'stats'}->{$crssec}) ||
534: $DynamicData{$file}->{'stats'}->{$crssec}->{'stdno'}<$stdno){
535: $DynamicData{$file}->{'stats'}->{$crssec}=\%Statistics;
536: }
537: }
538: }
539: return %DynamicData;
540: }
541:
542:
543: ######################################################################
544: ######################################################################
545:
546: =pod
547:
548: =item &process_dynamic_metadata
549:
550: Inputs: $url: the url of the item to process
551: $DynamicData: hash reference for the results of &process_reseval_data
552:
553: Returns: Hash containing the following keys:
554: avetries, avetries_list, difficulty, difficulty_list, stdno, stdno_list,
555: course, course_list, goto, goto_list, comefrom, comefrom_list,
556: usage, clear, technical, correct, helpful, depth, comments
557:
558: Each of the return keys is associated with either a number or a string
559: The *_list items are comma-seperated strings. 'comments' is a string
560: containing generically marked-up comments.
561:
562: =cut
563:
564: ######################################################################
565: ######################################################################
566: sub process_dynamic_metadata {
567: my ($url,$DynamicData) = @_;
568: my %data;
569: my $resdata = $DynamicData->{$url};
570: #
1.8 matthew 571: # Get the statistical data - Use a weighted average
572: foreach my $type (qw/avetries difficulty disc/) {
573: my $studentcount;
1.5 matthew 574: my $sum;
575: my @Values;
1.8 matthew 576: my @Students;
1.5 matthew 577: #
1.8 matthew 578: # Old data
1.5 matthew 579: foreach my $coursedata (values(%{$resdata->{'statistics'}}),
580: values(%{$resdata->{'stats'}})) {
581: if (ref($coursedata) eq 'HASH' && exists($coursedata->{$type})) {
1.8 matthew 582: $studentcount += $coursedata->{'stdno'};
583: $sum += ($coursedata->{$type}*$coursedata->{'stdno'});
1.5 matthew 584: push(@Values,$coursedata->{$type});
1.8 matthew 585: push(@Students,$coursedata->{'stdno'});
1.5 matthew 586: }
587: }
1.8 matthew 588: if (exists($resdata->{'stats'})) {
589: foreach my $identifier (sort(keys(%{$resdata->{'stats'}}))) {
590: my $coursedata = $resdata->{'stats'}->{$identifier};
591: $studentcount += $coursedata->{'stdno'};
592: $sum += $coursedata->{$type}*$coursedata->{'stdno'};
593: push(@Values,$coursedata->{$type});
594: push(@Students,$coursedata->{'stdno'});
595: }
596: }
597: #
598: # New data
599: if (defined($studentcount) && $studentcount>0) {
600: $data{$type} = $sum/$studentcount;
1.5 matthew 601: $data{$type.'_list'} = join(',',@Values);
602: }
603: }
604: #
1.8 matthew 605: # Find out the number of students who have completed the resource...
606: my $stdno;
607: foreach my $coursedata (values(%{$resdata->{'statistics'}}),
608: values(%{$resdata->{'stats'}})) {
609: if (ref($coursedata) eq 'HASH' && exists($coursedata->{'stdno'})) {
610: $stdno += $coursedata->{'stdno'};
611: }
612: }
613: if (exists($resdata->{'stats'})) {
614: #
615: # For the number of students, take the maximum found for the class
616: my $current_course;
617: my $coursemax=0;
618: foreach my $identifier (sort(keys(%{$resdata->{'stats'}}))) {
619: my $coursedata = $resdata->{'stats'}->{$identifier};
620: if (! defined($current_course)) {
621: $current_course = $coursedata->{'course'};
622: }
623: if ($current_course ne $coursedata->{'course'}) {
624: $stdno += $coursemax;
625: $coursemax = 0;
626: $current_course = $coursedata->{'course'};
627: }
628: if ($coursemax < $coursedata->{'stdno'}) {
629: $coursemax = $coursedata->{'stdno'};
630: }
631: }
632: $stdno += $coursemax; # pick up the final course in the list
633: }
634: $data{'stdno'}=$stdno;
635: #
1.5 matthew 636: # Get the context data
637: foreach my $type (qw/course goto comefrom/) {
638: if (defined($resdata->{$type}) &&
639: ref($resdata->{$type}) eq 'ARRAY') {
640: $data{$type} = scalar(@{$resdata->{$type}});
641: $data{$type.'_list'} = join(',',@{$resdata->{$type}});
642: }
643: }
644: if (defined($resdata->{'usage'}) &&
645: ref($resdata->{'usage'}) eq 'ARRAY') {
646: $data{'sequsage'} = scalar(@{$resdata->{'usage'}});
647: $data{'sequsage_list'} = join(',',@{$resdata->{'usage'}});
648: }
649: #
650: # Get the evaluation data
651: foreach my $type (qw/clear technical correct helpful depth/) {
652: my $count;
653: my $sum;
654: foreach my $evaluator (keys(%{$resdata->{'evaluation'}->{$type}})){
655: $sum += $resdata->{'evaluation'}->{$type}->{$evaluator};
656: $count++;
657: }
658: if ($count > 0) {
659: $data{$type}=$sum/$count;
660: }
661: }
662: #
663: # put together comments
664: my $comments = '<div class="LCevalcomments">';
665: foreach my $evaluator (keys(%{$resdata->{'evaluation'}->{'comments'}})){
1.7 matthew 666: $comments .=
667: '<p>'.
668: '<b>'.$evaluator.'</b>:'.
669: $resdata->{'evaluation'}->{'comments'}->{$evaluator}.
670: '</p>';
1.5 matthew 671: }
672: $comments .= '</div>';
1.7 matthew 673: $data{'comments'} = $comments;
1.5 matthew 674: #
1.8 matthew 675: if (exists($resdata->{'stats'})) {
676: $data{'stats'} = $resdata->{'stats'};
677: }
678: #
1.5 matthew 679: return %data;
680: }
681:
1.8 matthew 682: sub dynamic_metadata_storage {
683: my ($data) = @_;
684: my %Store;
685: my $courseid = $data->{'course'};
686: my $sections = $data->{'sections'};
687: my $numstu = $data->{'num_students'};
688: my $urlres = $data->{'urlres'};
689: my $key = $courseid.'&'.$sections.'&'.$numstu.'___'.$urlres.'___stats';
690: $Store{$key} =
691: 'course='.$courseid.'&'.
692: 'sections='.$sections.'&'.
693: 'timestamp='.time.'&'.
694: 'stdno='.$data->{'num_students'}.'&'.
695: 'avetries='.$data->{'mean_tries'}.'&'.
696: 'difficulty='.$data->{'deg_of_diff'};
697: if (exists($data->{'deg_of_disc'})) {
698: $Store{$key} .= '&'.'disc='.$data->{'deg_of_disc'};
699: }
700: return %Store;
701: }
1.6 matthew 702:
1.5 matthew 703: ######################################################################
704: ######################################################################
705: ##
706: ## The usual suspects, repeated here to reduce dependency hell
707: ##
708: ######################################################################
709: ######################################################################
710: sub unescape {
711: my $str=shift;
712: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
713: return $str;
714: }
715:
716: sub escape {
717: my $str=shift;
718: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
719: return $str;
720: }
1.6 matthew 721:
722:
1.5 matthew 723:
1.1 matthew 724:
725: 1;
726:
727: __END__;
728:
729: =pod
730:
731: =back
732:
733: =cut
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