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584 lines
26 KiB
PHP
584 lines
26 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 | |
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// | (UL,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("$CFG->dirroot/question/backuplib.php");
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/*
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* Insert necessary category ids to backup_ids table. Called during backup_check.html.
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* This backs up ids for quiz module. It backs up :
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* all categories and questions in course
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* all categories and questions in contexts of quiz module instances which have been selected for backup
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* all categories and questions in contexts above course level that are used by quizzes that have been selected for backup
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*/
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function quiz_insert_category_and_question_ids($course, $backup_unique_code, $instances = null) {
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global $CFG, $DB;
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$status = true;
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// Create missing categories and reasign orphaned questions.
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quiz_fix_orphaned_questions($course);
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$coursecontext = get_context_instance(CONTEXT_COURSE, $course);
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$status = $status && question_insert_c_and_q_ids_for_course($coursecontext, $backup_unique_code);
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// then, all categories and questions from this course's modules' contexts.
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$status = $status && question_insert_c_and_q_ids_for_module($backup_unique_code, $course, 'quiz', $instances);
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// Then categories from parent contexts used by the quizzes we are backing up.
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$parentcontexts = get_parent_contexts($coursecontext);
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$params = array($course);
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$from = "{quiz} quiz,";
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$where = "AND quiz.course = ?
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AND qqi.quiz = quiz.id";
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if (!empty($instances) && is_array($instances) && count($instances)) {
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$questionselectsqlfrom = '';
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list($quiz_usql, $quiz_params) = $DB->get_in_or_equal(array_keys($instances));
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$questionselectsqlwhere = "AND qqi.quiz $quiz_usql";
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$params = array_merge($params, $quiz_params);
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} else {
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$questionselectsqlfrom = "{quiz} quiz,";
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$questionselectsqlwhere = "AND quiz.course = ? AND qqi.quiz = quiz.id";
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$params[] = $course;
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}
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list($usql, $context_params) = $DB->get_in_or_equal($parentcontexts);
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$params = array_merge($context_params, $params);
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$categories = $DB->get_records_sql("
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SELECT id, parent, 0 AS childrendone
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FROM {question_categories}
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WHERE contextid $usql
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AND id IN (
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SELECT DISTINCT question.category
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FROM {question} question,
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$questionselectsqlfrom
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{quiz_question_instances} qqi
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WHERE qqi.question = question.id
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$questionselectsqlwhere
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)", $params);
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if (!$categories) {
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$categories = array();
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} else {
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//put the ids of the used questions from all these categories into the db.
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$status = $status && $DB->execute("INSERT INTO {backup_ids}
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(backup_code, table_name, old_id, info)
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SELECT DISTINCT $backup_unique_code, 'question', q.id, ''
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FROM {question} q,
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$from
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{question_categories} qc,
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{quiz_question_instances} qqi
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WHERE (qqi.question = q.id
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OR qqi.question = q.parent)
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AND q.category = qc.id
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AND qc.contextid $usql $where", array_merge($context_params, array($course)));
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// Add the parent categories, of these categories up to the top of the category tree.
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// not backing up the questions in these categories.
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foreach ($categories as $category) {
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while ($category->parent != 0) {
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if (array_key_exists($category->parent, $categories)) {
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// Parent category already on the list.
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break;
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}
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$currentid = $category->id;
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$category = $DB->get_record('question_categories', array('id' => $category->parent), 'id, parent, 0 AS childrendone');
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if ($category) {
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$categories[$category->id] = $category;
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} else {
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// Parent not found: this indicates an error, but just fix it.
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$DB->set_field('question_categories', 'parent', 0, array('id' => $currentid));
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break;
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}
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}
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}
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// Now we look for categories from other courses containing random questions
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// in our quizzes that select from the category and its subcategories. That implies
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// those subcategories also need to be backed up. (The categories themselves
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// and their parents will already have been included.)
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$categorieswithrandom = $DB->get_records_sql("
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SELECT question.category AS id, SUM(" .
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$DB->sql_cast_char2int('questiontext', true) . ") AS numqsusingsubcategories
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FROM {quiz_question_instances} qqi,
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$from
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{question} question
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WHERE question.id = qqi.question
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AND question.qtype = '" . RANDOM . "'
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$where
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GROUP BY question.category
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", array($course));
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$randomselectedquestions = array();
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if ($categorieswithrandom) {
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foreach ($categorieswithrandom as $category) {
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if ($category->numqsusingsubcategories > 0) {
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$status = $status && quiz_backup_add_sub_categories($categories, $randomselectedquestions, $category->id);
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}
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}
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list($usql, $params) = $DB->get_in_or_equal(array_keys($categorieswithrandom));
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$returnval = $DB->get_records_sql("
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SELECT question.id
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FROM {question} question
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WHERE question.category $usql", $params);
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if ($returnval) {
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$randomselectedquestions += $returnval;
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}
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}
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// Finally, add all these extra categories to the backup_ids table.
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foreach ($categories as $category) {
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$status = $status && backup_putid($backup_unique_code, 'question_categories', $category->id, 0);
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}
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// Finally, add all these extra categories to the backup_ids table.
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foreach ($randomselectedquestions as $question) {
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$status = $status && backup_putid($backup_unique_code, 'question', $question->id, 0);
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}
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}
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return $status;
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}
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/**
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* Helper function adding the id of all the subcategories of a category to an array.
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*/
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function quiz_backup_add_sub_categories(&$categories, &$questions, $categoryid) {
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global $CFG, $DB;
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$status = true;
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if ($categories[$categoryid]->childrendone) {
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return $status;
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}
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if ($subcategories = $DB->get_records('question_categories', array('parent' => $categoryid), '', 'id, 0 AS childrendone')) {
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foreach ($subcategories as $subcategory) {
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if (!array_key_exists($subcategory->id, $categories)) {
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$categories[$subcategory->id] = $subcategory;
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}
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$status = $status && quiz_backup_add_sub_categories($categories, $questions, $subcategory->id);
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}
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list($usql, $params) = $DB->get_in_or_equal(array_keys($subcategories));
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$returnval = $DB->get_records_sql("
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SELECT question.id
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FROM {question} question
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WHERE question.category $usql", $params);
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if ($returnval) {
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$questions += $returnval;
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}
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}
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$categories[$categoryid]->childrendone = 1;
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return $status;
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}
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//This function is used to detect orphaned questions (pointing to a
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//non existing category) and to recreate such category. This function
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//is used by the backup process, to ensure consistency and should be
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//executed in the upgrade process and, perhaps in the health center.
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function quiz_fix_orphaned_questions ($course) {
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global $CFG, $DB;
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$categories = $DB->get_records_sql("SELECT DISTINCT t.category, t.category
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FROM {question} t,
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{quiz_question_instances} g,
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{quiz} q
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WHERE q.course = ? AND
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g.quiz = q.id AND
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g.question = t.id", array($course));
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if ($categories) {
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foreach ($categories as $key => $category) {
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$exist = $DB->get_record('question_categories', array('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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$db_cat = new stdClass;
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// always create missing categories in course context
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$db_cat->contextid = get_context_instance(CONTEXT_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->stamp = make_unique_id_code();
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//Insert the new category
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$catid = $DB->insert_record('question_categories',$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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$DB->set_field ('question','category',$catid,array('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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global $DB;
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$status = true;
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if (is_numeric($quiz)) {
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$quiz = $DB->get_record('quiz', array('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,round($quiz->timelimit/60)));
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fwrite ($bf,full_tag("TIMELIMITSECS",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,$quiz->id);
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//if we've selected to backup users info, then execute:
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// - backup_quiz_grades
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// - backup_quiz_attempts
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if (backup_userdata_selected($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 $DB;
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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 = $DB->get_records('quiz',array('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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global $DB;
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$status = true;
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$quiz_question_instances = $DB->get_records('quiz_question_instances',array('quiz' =>$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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global $DB;
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$status = true;
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$quiz_feedback = $DB->get_records('quiz_feedback', array('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 $status;
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}
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//Backup quiz_grades contents (executed from quiz_backup_mods)
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function backup_quiz_grades ($bf,$preferences,$quiz) {
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global $DB;
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$status = true;
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$quiz_grades = $DB->get_records('quiz_grades',array('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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global $DB;
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$status = true;
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$quiz_attempts = $DB->get_records('quiz_attempts', array('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);
|
|
//Now write to xml the sessions (in this attempt)
|
|
$status = backup_question_sessions ($bf,$preferences,$attempt->uniqueid);
|
|
//End attempt
|
|
$status = fwrite ($bf,end_tag("ATTEMPT",5,true));
|
|
}
|
|
//Write end tag
|
|
$status = fwrite ($bf,end_tag("ATTEMPTS",4,true));
|
|
}
|
|
return $status;
|
|
}
|
|
|
|
function quiz_check_backup_mods_instances($instance,$backup_unique_code) {
|
|
// the keys in this array need to be unique as they get merged...
|
|
$info[$instance->id.'0'][0] = '<b>'.$instance->name.'</b>';
|
|
$info[$instance->id.'0'][1] = '';
|
|
|
|
//Categories
|
|
$info[$instance->id.'1'][0] = get_string("categories","quiz");
|
|
if ($ids = question_category_ids_by_backup ($backup_unique_code)) {
|
|
$info[$instance->id.'1'][1] = count($ids);
|
|
} else {
|
|
$info[$instance->id.'1'][1] = 0;
|
|
}
|
|
//Questions
|
|
$info[$instance->id.'2'][0] = get_string("questionsinclhidden","quiz");
|
|
if ($ids = question_ids_by_backup ($backup_unique_code)) {
|
|
$info[$instance->id.'2'][1] = count($ids);
|
|
} else {
|
|
$info[$instance->id.'2'][1] = 0;
|
|
}
|
|
|
|
//Now, if requested, the user_data
|
|
if (!empty($instance->userdata)) {
|
|
//Grades
|
|
$info[$instance->id.'3'][0] = get_string("grades");
|
|
if ($ids = quiz_grade_ids_by_instance ($instance->id)) {
|
|
$info[$instance->id.'3'][1] = count($ids);
|
|
} else {
|
|
$info[$instance->id.'3'][1] = 0;
|
|
}
|
|
}
|
|
return $info;
|
|
}
|
|
|
|
////Return an array of info (name,value)
|
|
/// $instances is an array with key = instanceid, value = object (name,id,userdata)
|
|
function quiz_check_backup_mods($course,$user_data= false,$backup_unique_code,$instances=null) {
|
|
//this function selects all the questions / categories to be backed up.
|
|
quiz_insert_category_and_question_ids($course, $backup_unique_code, $instances);
|
|
if ($course != SITEID){
|
|
question_insert_site_file_names($course, $backup_unique_code);
|
|
}
|
|
if (!empty($instances) && is_array($instances) && count($instances)) {
|
|
$info = array();
|
|
foreach ($instances as $id => $instance) {
|
|
$info += quiz_check_backup_mods_instances($instance,$backup_unique_code);
|
|
}
|
|
return $info;
|
|
}
|
|
//First the course data
|
|
$info[0][0] = get_string("modulenameplural","quiz");
|
|
if ($ids = quiz_ids ($course)) {
|
|
$info[0][1] = count($ids);
|
|
} else {
|
|
$info[0][1] = 0;
|
|
}
|
|
//Categories
|
|
$info[1][0] = get_string("categories","quiz");
|
|
if ($ids = question_category_ids_by_backup ($backup_unique_code)) {
|
|
$info[1][1] = count($ids);
|
|
} else {
|
|
$info[1][1] = 0;
|
|
}
|
|
//Questions
|
|
$info[2][0] = get_string("questions","quiz");
|
|
if ($ids = question_ids_by_backup ($backup_unique_code)) {
|
|
$info[2][1] = count($ids);
|
|
} else {
|
|
$info[2][1] = 0;
|
|
}
|
|
|
|
//Now, if requested, the user_data
|
|
if ($user_data) {
|
|
//Grades
|
|
$info[3][0] = get_string("grades");
|
|
if ($ids = quiz_grade_ids_by_course ($course)) {
|
|
$info[3][1] = count($ids);
|
|
} else {
|
|
$info[3][1] = 0;
|
|
}
|
|
}
|
|
|
|
return $info;
|
|
}
|
|
|
|
//Return a content encoded to support interactivities linking. Every module
|
|
//should have its own. They are called automatically from the backup procedure.
|
|
function quiz_encode_content_links ($content,$preferences) {
|
|
|
|
global $CFG;
|
|
|
|
$base = preg_quote($CFG->wwwroot,"/");
|
|
|
|
//Link to the list of quizs
|
|
$buscar="/(".$base."\/mod\/quiz\/index.php\?id\=)([0-9]+)/";
|
|
$result= preg_replace($buscar,'$@QUIZINDEX*$2@$',$content);
|
|
|
|
//Link to quiz view by moduleid
|
|
$buscar="/(".$base."\/mod\/quiz\/view.php\?id\=)([0-9]+)/";
|
|
$result= preg_replace($buscar,'$@QUIZVIEWBYID*$2@$',$result);
|
|
|
|
//Link to quiz view by quizid
|
|
$buscar="/(".$base."\/mod\/quiz\/view.php\?q\=)([0-9]+)/";
|
|
$result= preg_replace($buscar,'$@QUIZVIEWBYQ*$2@$',$result);
|
|
|
|
return $result;
|
|
}
|
|
|
|
// INTERNAL FUNCTIONS. BASED IN THE MOD STRUCTURE
|
|
|
|
//Returns an array of quiz id
|
|
function quiz_ids ($course) {
|
|
|
|
global $CFG, $DB;
|
|
|
|
return $DB->get_records_sql ("SELECT a.id, a.course
|
|
FROM {quiz} a
|
|
WHERE a.course = ?", array($course));
|
|
}
|
|
|
|
function quiz_grade_ids_by_course ($course) {
|
|
|
|
global $CFG, $DB;
|
|
|
|
return $DB->get_records_sql ("SELECT g.id, g.quiz
|
|
FROM {quiz} a,
|
|
{quiz_grades} g
|
|
WHERE a.course = ? and
|
|
g.quiz = a.id", array($course));
|
|
}
|
|
|
|
function quiz_grade_ids_by_instance($instanceid) {
|
|
|
|
global $CFG, $DB;
|
|
|
|
return $DB->get_records_sql ("SELECT g.id, g.quiz
|
|
FROM {quiz_grades} g
|
|
WHERE g.quiz = ?", array($instanceid));
|
|
}
|
|
|
|
?>
|