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535 lines
23 KiB
PHP
535 lines
23 KiB
PHP
<?php //$Id$
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//This php script contains all the stuff to backup quizzes
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//This is the "graphical" structure of the quiz mod:
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//To see, put your terminal to 160cc
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//
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// quiz
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// (CL,pk->id)
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// |
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// -------------------------------------------------------------------
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// | | | | |
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// | quiz_grades | quiz_question_versions |
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// | (UL,pk->id,fk->quiz) | (CL,pk->id,fk->quiz) |
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// | | |
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// quiz_attempts quiz_question_instances quiz_feedback
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// (UL,pk->id,fk->quiz) (CL,pk->id,fk->quiz,question) (CL,pk->id,fk->quiz)
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//
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// Meaning: pk->primary key field of the table
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// fk->foreign key to link with parent
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// nt->nested field (recursive data)
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// SL->site level info
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// CL->course level info
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// UL->user level info
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// files->table may have files
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//
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//-----------------------------------------------------------
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// When we backup a quiz we also need to backup the questions and possibly
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// the data about student interaction with the questions. The functions to do
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// that are included with the following library
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require_once("$CFG->libdir/questionlib.php");
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require_once("$CFG->dirroot/question/backuplib.php");
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//STEP 1. Backup categories/questions and associated structures
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// (course independent)
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//Insert necessary category ids to backup_ids table
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function insert_category_ids ($course,$backup_unique_code,$instances=null) {
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global $CFG;
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include_once("$CFG->dirroot/mod/quiz/lib.php");
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//Create missing categories and reasign orphaned questions
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fix_orphaned_questions($course);
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// defaults
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$where = "q.course = '$course' AND g.quiz = q.id AND ";
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$from = ", {$CFG->prefix}quiz q";
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// but if we have an array of quiz ids, use those instead.
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if (!empty($instances) && is_array($instances) && count($instances)) {
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$where = ' g.quiz IN ('.implode(',',array_keys($instances)).') AND ';
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$from = '';
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}
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//Detect used categories (by category in questions)
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$status = execute_sql("INSERT INTO {$CFG->prefix}backup_ids
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(backup_code, table_name, old_id, info)
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SELECT DISTINCT $backup_unique_code,'question_categories',t.category,''
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FROM {$CFG->prefix}question t,
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{$CFG->prefix}quiz_question_instances g
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$from
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WHERE $where g.question = t.id",false);
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//Now, foreach detected category, we look for their parents upto 0 (top category)
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$categories = get_records_sql("SELECT old_id, old_id
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FROM {$CFG->prefix}backup_ids
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WHERE backup_code = $backup_unique_code AND
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table_name = 'question_categories'");
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if ($categories) {
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foreach ($categories as $category) {
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if ($dbcat = get_record('question_categories','id',$category->old_id)) {
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//echo $dbcat->name; //Debug
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//Go up to 0
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while ($dbcat->parent != 0) {
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//echo '->'; //Debug
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$current = $dbcat->id;
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if ($dbcat = get_record('question_categories','id',$dbcat->parent)) {
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//Found parent, add it to backup_ids (by using backup_putid
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//we ensure no duplicates!)
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$status = backup_putid($backup_unique_code,'question_categories',$dbcat->id,0);
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//echo $dbcat->name; //Debug
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} else {
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//Parent not found, fix it (set its parent to 0)
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set_field ('question_categories','parent',0,'id',$current);
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//echo 'assigned to top!'; //Debug
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}
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}
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//echo '<br />'; //Debug
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}
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}
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}
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// Now we look for random questions that can use questions from subcategories
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// because we will have to add these subcategories
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$sql = "SELECT t.id, t.category
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FROM {$CFG->prefix}quiz_question_instances g,
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{$CFG->prefix}question t
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$from
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WHERE $where t.id = g.question
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AND t.qtype = '".RANDOM."'
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AND t.questiontext = '1'";
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if ($randoms = get_records_sql($sql)) {
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foreach ($randoms as $random) {
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$status = quiz_backup_add_category_tree($backup_unique_code, $random->category);
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}
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}
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return $status;
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}
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/**
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* Helper function adding the id of a category and all its descendents to the backup_ids
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*/
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function quiz_backup_add_category_tree($backup_unique_code, $categoryid) {
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$status = backup_putid($backup_unique_code,'question_categories',$categoryid,0);
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if ($subcategories = get_records('question_categories', 'parent', $categoryid, 'sortorder ASC', 'id, id')) {
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foreach ($subcategories as $subcategory) {
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$status = quiz_backup_add_category_tree($backup_unique_code, $subcategory->id);
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}
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}
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return $status;
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}
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//This function is used to detect orphaned questions (pointing to a
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//non existing category) and to recreate such category. This function
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//is used by the backup process, to ensure consistency and should be
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//executed in the upgrade process and, perhaps in the health center.
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function fix_orphaned_questions ($course) {
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global $CFG;
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$categories = get_records_sql("SELECT DISTINCT t.category, t.category
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FROM {$CFG->prefix}question t,
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{$CFG->prefix}quiz_question_instances g,
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{$CFG->prefix}quiz q
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WHERE q.course = '$course' AND
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g.quiz = q.id AND
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g.question = t.id",false);
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if ($categories) {
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foreach ($categories as $key => $category) {
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$exist = get_record('question_categories','id', $key);
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//If the category doesn't exist
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if (!$exist) {
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//Build a new category
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$db_cat = new stdClass;
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$db_cat->course = $course;
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$db_cat->name = get_string('recreatedcategory','',$key);
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$db_cat->info = get_string('recreatedcategory','',$key);
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$db_cat->publish = 1;
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$db_cat->stamp = make_unique_id_code();
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//Insert the new category
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$catid = insert_record('question_categories',$db_cat);
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unset ($db_cat);
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if ($catid) {
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//Reasign orphaned questions to their new category
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set_field ('question','category',$catid,'category',$key);
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}
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}
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}
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}
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}
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//STEP 2. Backup quizzes and associated structures
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// (course dependent)
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function quiz_backup_one_mod($bf,$preferences,$quiz) {
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$status = true;
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if (is_numeric($quiz)) {
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$quiz = get_record('quiz','id',$quiz);
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}
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//Start mod
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fwrite ($bf,start_tag("MOD",3,true));
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//Print quiz data
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fwrite ($bf,full_tag("ID",4,false,$quiz->id));
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fwrite ($bf,full_tag("MODTYPE",4,false,"quiz"));
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fwrite ($bf,full_tag("NAME",4,false,$quiz->name));
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fwrite ($bf,full_tag("INTRO",4,false,$quiz->intro));
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fwrite ($bf,full_tag("TIMEOPEN",4,false,$quiz->timeopen));
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fwrite ($bf,full_tag("TIMECLOSE",4,false,$quiz->timeclose));
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fwrite ($bf,full_tag("OPTIONFLAGS",4,false,$quiz->optionflags));
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fwrite ($bf,full_tag("PENALTYSCHEME",4,false,$quiz->penaltyscheme));
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fwrite ($bf,full_tag("ATTEMPTS_NUMBER",4,false,$quiz->attempts));
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fwrite ($bf,full_tag("ATTEMPTONLAST",4,false,$quiz->attemptonlast));
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fwrite ($bf,full_tag("GRADEMETHOD",4,false,$quiz->grademethod));
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fwrite ($bf,full_tag("DECIMALPOINTS",4,false,$quiz->decimalpoints));
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fwrite ($bf,full_tag("REVIEW",4,false,$quiz->review));
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fwrite ($bf,full_tag("QUESTIONSPERPAGE",4,false,$quiz->questionsperpage));
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fwrite ($bf,full_tag("SHUFFLEQUESTIONS",4,false,$quiz->shufflequestions));
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fwrite ($bf,full_tag("SHUFFLEANSWERS",4,false,$quiz->shuffleanswers));
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fwrite ($bf,full_tag("QUESTIONS",4,false,$quiz->questions));
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fwrite ($bf,full_tag("SUMGRADES",4,false,$quiz->sumgrades));
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fwrite ($bf,full_tag("GRADE",4,false,$quiz->grade));
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fwrite ($bf,full_tag("TIMECREATED",4,false,$quiz->timecreated));
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fwrite ($bf,full_tag("TIMEMODIFIED",4,false,$quiz->timemodified));
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fwrite ($bf,full_tag("TIMELIMIT",4,false,$quiz->timelimit));
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fwrite ($bf,full_tag("PASSWORD",4,false,$quiz->password));
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fwrite ($bf,full_tag("SUBNET",4,false,$quiz->subnet));
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fwrite ($bf,full_tag("POPUP",4,false,$quiz->popup));
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fwrite ($bf,full_tag("DELAY1",4,false,$quiz->delay1));
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fwrite ($bf,full_tag("DELAY2",4,false,$quiz->delay2));
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//Now we print to xml question_instances (Course Level)
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$status = backup_quiz_question_instances($bf,$preferences,$quiz->id);
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//Now we print to xml quiz_feedback (Course Level)
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$status = backup_quiz_feedback($bf,$preferences,$quiz->id);
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//Now we print to xml question_versions (Course Level)
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$status = backup_quiz_question_versions($bf,$preferences,$quiz->id);
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//if we've selected to backup users info, then execute:
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// - backup_quiz_grades
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// - backup_quiz_attempts
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if (backup_userdata_selected($preferences,'quiz',$quiz->id) && $status) {
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$status = backup_quiz_grades($bf,$preferences,$quiz->id);
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if ($status) {
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$status = backup_quiz_attempts($bf,$preferences,$quiz->id);
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}
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}
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//End mod
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$status = fwrite ($bf,end_tag("MOD",3,true));
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return $status;
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}
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function quiz_backup_mods($bf,$preferences) {
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global $CFG;
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$status = true;
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//Iterate over quiz table
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$quizzes = get_records ("quiz","course",$preferences->backup_course,"id");
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if ($quizzes) {
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foreach ($quizzes as $quiz) {
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if (backup_mod_selected($preferences,'quiz',$quiz->id)) {
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$status = quiz_backup_one_mod($bf,$preferences,$quiz);
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}
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}
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}
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return $status;
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}
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//Backup quiz_question_instances contents (executed from quiz_backup_mods)
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function backup_quiz_question_instances ($bf,$preferences,$quiz) {
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$status = true;
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$quiz_question_instances = get_records("quiz_question_instances","quiz",$quiz,"id");
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//If there are question_instances
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if ($quiz_question_instances) {
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//Write start tag
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$status = fwrite ($bf,start_tag("QUESTION_INSTANCES",4,true));
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//Iterate over each question_instance
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foreach ($quiz_question_instances as $que_ins) {
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//Start question instance
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$status = fwrite ($bf,start_tag("QUESTION_INSTANCE",5,true));
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//Print question_instance contents
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fwrite ($bf,full_tag("ID",6,false,$que_ins->id));
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fwrite ($bf,full_tag("QUESTION",6,false,$que_ins->question));
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fwrite ($bf,full_tag("GRADE",6,false,$que_ins->grade));
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//End question instance
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$status = fwrite ($bf,end_tag("QUESTION_INSTANCE",5,true));
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}
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//Write end tag
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$status = fwrite ($bf,end_tag("QUESTION_INSTANCES",4,true));
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}
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return $status;
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}
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//Backup quiz_question_instances contents (executed from quiz_backup_mods)
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function backup_quiz_feedback ($bf,$preferences,$quiz) {
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$status = true;
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$quiz_feedback = get_records('quiz_feedback', 'quizid', $quiz, 'id');
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// If there are question_instances ...
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if ($quiz_feedback) {
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// Write start tag.
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$status = $status & fwrite($bf,start_tag('FEEDBACKS', 4, true));
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// Iterate over each question_instance.
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foreach ($quiz_feedback as $feedback) {
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//Start feedback instance
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$status = $status & fwrite($bf, start_tag('FEEDBACK',5,true));
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//Print question_instance contents.
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$status = $status & fwrite($bf, full_tag('ID', 6, false, $feedback->id));
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$status = $status & fwrite($bf, full_tag('QUIZID', 6, false, $feedback->quizid));
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$status = $status & fwrite($bf, full_tag('FEEDBACKTEXT', 6, false, $feedback->feedbacktext));
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$status = $status & fwrite($bf, full_tag('MINGRADE', 6, false, $feedback->mingrade));
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$status = $status & fwrite($bf, full_tag('MAXGRADE', 6, false, $feedback->maxgrade));
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// End feedback instance.
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$status = $status & fwrite($bf, end_tag('FEEDBACK', 5, true));
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}
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// Write end tag.
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$status = $status & fwrite($bf, end_tag('FEEDBACKS', 4, true));
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}
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return $status;
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}
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//Backup quiz_question_versions contents (executed from quiz_backup_mods)
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function backup_quiz_question_versions ($bf,$preferences,$quiz) {
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$status = true;
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$quiz_question_versions = get_records("quiz_question_versions","quiz",$quiz,"id");
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//If there are question_versions
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if ($quiz_question_versions) {
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//Write start tag
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$status = fwrite ($bf,start_tag("QUESTION_VERSIONS",4,true));
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//Iterate over each question_version
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foreach ($quiz_question_versions as $que_ver) {
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//Start question version
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$status = fwrite ($bf,start_tag("QUESTION_VERSION",5,true));
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//Print question_version contents
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fwrite ($bf,full_tag("ID",6,false,$que_ver->id));
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fwrite ($bf,full_tag("OLDQUESTION",6,false,$que_ver->oldquestion));
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fwrite ($bf,full_tag("NEWQUESTION",6,false,$que_ver->newquestion));
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fwrite ($bf,full_tag("ORIGINALQUESTION",6,false,$que_ver->originalquestion));
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fwrite ($bf,full_tag("USERID",6,false,$que_ver->userid));
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fwrite ($bf,full_tag("TIMESTAMP",6,false,$que_ver->timestamp));
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//End question version
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$status = fwrite ($bf,end_tag("QUESTION_VERSION",5,true));
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}
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//Write end tag
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$status = fwrite ($bf,end_tag("QUESTION_VERSIONS",4,true));
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}
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return $status;
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}
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//Backup quiz_grades contents (executed from quiz_backup_mods)
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function backup_quiz_grades ($bf,$preferences,$quiz) {
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$status = true;
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$quiz_grades = get_records("quiz_grades","quiz",$quiz,"id");
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//If there are grades
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if ($quiz_grades) {
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//Write start tag
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$status = fwrite ($bf,start_tag("GRADES",4,true));
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//Iterate over each grade
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foreach ($quiz_grades as $gra) {
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//Start grade
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$status = fwrite ($bf,start_tag("GRADE",5,true));
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//Print grade contents
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fwrite ($bf,full_tag("ID",6,false,$gra->id));
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fwrite ($bf,full_tag("USERID",6,false,$gra->userid));
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fwrite ($bf,full_tag("GRADEVAL",6,false,$gra->grade));
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fwrite ($bf,full_tag("TIMEMODIFIED",6,false,$gra->timemodified));
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//End question grade
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$status = fwrite ($bf,end_tag("GRADE",5,true));
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}
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//Write end tag
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$status = fwrite ($bf,end_tag("GRADES",4,true));
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}
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return $status;
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}
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//Backup quiz_attempts contents (executed from quiz_backup_mods)
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function backup_quiz_attempts ($bf,$preferences,$quiz) {
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$status = true;
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$quiz_attempts = get_records("quiz_attempts","quiz",$quiz,"id");
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//If there are attempts
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if ($quiz_attempts) {
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//Write start tag
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$status = fwrite ($bf,start_tag("ATTEMPTS",4,true));
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//Iterate over each attempt
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foreach ($quiz_attempts as $attempt) {
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//Start attempt
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$status = fwrite ($bf,start_tag("ATTEMPT",5,true));
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//Print attempt contents
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fwrite ($bf,full_tag("ID",6,false,$attempt->id));
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fwrite ($bf,full_tag("UNIQUEID",6,false,$attempt->uniqueid));
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fwrite ($bf,full_tag("USERID",6,false,$attempt->userid));
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fwrite ($bf,full_tag("ATTEMPTNUM",6,false,$attempt->attempt));
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fwrite ($bf,full_tag("SUMGRADES",6,false,$attempt->sumgrades));
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fwrite ($bf,full_tag("TIMESTART",6,false,$attempt->timestart));
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fwrite ($bf,full_tag("TIMEFINISH",6,false,$attempt->timefinish));
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fwrite ($bf,full_tag("TIMEMODIFIED",6,false,$attempt->timemodified));
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fwrite ($bf,full_tag("LAYOUT",6,false,$attempt->layout));
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fwrite ($bf,full_tag("PREVIEW",6,false,$attempt->preview));
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//Now write to xml the states (in this attempt)
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$status = backup_question_states ($bf,$preferences,$attempt->uniqueid);
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//Now write to xml the sessions (in this attempt)
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$status = backup_question_sessions ($bf,$preferences,$attempt->uniqueid);
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//End attempt
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$status = fwrite ($bf,end_tag("ATTEMPT",5,true));
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}
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//Write end tag
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$status = fwrite ($bf,end_tag("ATTEMPTS",4,true));
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}
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return $status;
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}
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function quiz_check_backup_mods_instances($instance,$backup_unique_code) {
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// the keys in this array need to be unique as they get merged...
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$info[$instance->id.'0'][0] = '<b>'.$instance->name.'</b>';
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$info[$instance->id.'0'][1] = '';
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//Categories
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$info[$instance->id.'1'][0] = get_string("categories","quiz");
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if ($ids = question_category_ids_by_backup ($backup_unique_code)) {
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$info[$instance->id.'1'][1] = count($ids);
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} else {
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$info[$instance->id.'1'][1] = 0;
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}
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//Questions
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$info[$instance->id.'2'][0] = get_string("questionsinclhidden","quiz");
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if ($ids = question_ids_by_backup ($backup_unique_code)) {
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$info[$instance->id.'2'][1] = count($ids);
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} else {
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$info[$instance->id.'2'][1] = 0;
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}
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//Now, if requested, the user_data
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if (!empty($instance->userdata)) {
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//Grades
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$info[$instance->id.'3'][0] = get_string("grades");
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if ($ids = quiz_grade_ids_by_instance ($instance->id)) {
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$info[$instance->id.'3'][1] = count($ids);
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} else {
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$info[$instance->id.'3'][1] = 0;
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}
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}
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return $info;
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}
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////Return an array of info (name,value)
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/// $instances is an array with key = instanceid, value = object (name,id,userdata)
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function quiz_check_backup_mods($course,$user_data= false,$backup_unique_code,$instances=null) {
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//Deletes data from mdl_backup_ids (categories section)
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delete_category_ids ($backup_unique_code);
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//Create date into mdl_backup_ids (categories section)
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insert_category_ids ($course,$backup_unique_code,$instances);
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if (!empty($instances) && is_array($instances) && count($instances)) {
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$info = array();
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foreach ($instances as $id => $instance) {
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$info += quiz_check_backup_mods_instances($instance,$backup_unique_code);
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}
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return $info;
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}
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//First the course data
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$info[0][0] = get_string("modulenameplural","quiz");
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if ($ids = quiz_ids ($course)) {
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$info[0][1] = count($ids);
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} else {
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$info[0][1] = 0;
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}
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//Categories
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$info[1][0] = get_string("categories","quiz");
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if ($ids = question_category_ids_by_backup ($backup_unique_code)) {
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$info[1][1] = count($ids);
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} else {
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$info[1][1] = 0;
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}
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|
//Questions
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$info[2][0] = get_string("questions","quiz");
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if ($ids = question_ids_by_backup ($backup_unique_code)) {
|
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$info[2][1] = count($ids);
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} else {
|
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$info[2][1] = 0;
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}
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|
|
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//Now, if requested, the user_data
|
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if ($user_data) {
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//Grades
|
|
$info[3][0] = get_string("grades");
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if ($ids = quiz_grade_ids_by_course ($course)) {
|
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$info[3][1] = count($ids);
|
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} else {
|
|
$info[3][1] = 0;
|
|
}
|
|
}
|
|
|
|
return $info;
|
|
}
|
|
|
|
//Return a content encoded to support interactivities linking. Every module
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|
//should have its own. They are called automatically from the backup procedure.
|
|
function quiz_encode_content_links ($content,$preferences) {
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|
|
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global $CFG;
|
|
|
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$base = preg_quote($CFG->wwwroot,"/");
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|
|
|
//Link to the list of quizs
|
|
$buscar="/(".$base."\/mod\/quiz\/index.php\?id\=)([0-9]+)/";
|
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$result= preg_replace($buscar,'$@QUIZINDEX*$2@$',$content);
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|
|
|
//Link to quiz view by moduleid
|
|
$buscar="/(".$base."\/mod\/quiz\/view.php\?id\=)([0-9]+)/";
|
|
$result= preg_replace($buscar,'$@QUIZVIEWBYID*$2@$',$result);
|
|
|
|
return $result;
|
|
}
|
|
|
|
// INTERNAL FUNCTIONS. BASED IN THE MOD STRUCTURE
|
|
|
|
//Returns an array of quiz id
|
|
function quiz_ids ($course) {
|
|
|
|
global $CFG;
|
|
|
|
return get_records_sql ("SELECT a.id, a.course
|
|
FROM {$CFG->prefix}quiz a
|
|
WHERE a.course = '$course'");
|
|
}
|
|
|
|
function quiz_grade_ids_by_course ($course) {
|
|
|
|
global $CFG;
|
|
|
|
return get_records_sql ("SELECT g.id, g.quiz
|
|
FROM {$CFG->prefix}quiz a,
|
|
{$CFG->prefix}quiz_grades g
|
|
WHERE a.course = '$course' and
|
|
g.quiz = a.id");
|
|
}
|
|
|
|
function quiz_grade_ids_by_instance($instanceid) {
|
|
|
|
global $CFG;
|
|
|
|
return get_records_sql ("SELECT g.id, g.quiz
|
|
FROM {$CFG->prefix}quiz_grades g
|
|
WHERE g.quiz = $instanceid");
|
|
}
|
|
|
|
?>
|