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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* @package moodlecore
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* @subpackage backup-dbops
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* @copyright 2010 onwards Eloy Lafuente (stronk7) {@link http://stronk7.com}
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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/**
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* Non instantiable helper class providing DB support to the questions backup stuff
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*
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* This class contains various static methods available for all the DB operations
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* performed by questions stuff
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*
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* TODO: Finish phpdocs
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*/
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abstract class backup_question_dbops extends backup_dbops {
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/**
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* Calculates all the question_categories to be included
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* in backup, based in a given context (course/module) and
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* the already annotated questions present in backup_ids_temp
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*/
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public static function calculate_question_categories($backupid, $contextid) {
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global $DB;
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// First step, annotate all the categories for the given context (course/module)
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// i.e. the whole context questions bank
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$DB->execute("INSERT INTO {backup_ids_temp} (backupid, itemname, itemid)
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SELECT ?, 'question_category', id
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FROM {question_categories}
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WHERE contextid = ?", array($backupid, $contextid));
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// Now, based in the annotated questions, annotate all the categories they
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// belong to (whole context question banks too)
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// First, get all the contexts we are going to save their question bank (no matter
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// where they are in the contexts hierarchy, transversals... whatever)
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$contexts = $DB->get_fieldset_sql("SELECT DISTINCT qc2.contextid
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FROM {question_categories} qc2
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JOIN {question_bank_entries} qbe ON qbe.questioncategoryid = qc2.id
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JOIN {question_versions} qv ON qv.questionbankentryid = qbe.id
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JOIN {question} q ON q.id = qv.questionid
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JOIN {backup_ids_temp} bi ON bi.itemid = q.id
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WHERE bi.backupid = ?
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AND bi.itemname = 'question'
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AND qc2.contextid != ?", array($backupid, $contextid));
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// Calculate and get the set reference records.
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$setreferencecontexts = $DB->get_fieldset_sql("
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SELECT DISTINCT qc.contextid
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FROM {question_categories} qc
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JOIN {question_set_references} qsr ON qsr.questionscontextid = qc.contextid
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WHERE qsr.usingcontextid = ?", [$contextid]);
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foreach ($setreferencecontexts as $setreferencecontext) {
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if (!in_array($setreferencecontext, $contexts) && (int)$setreferencecontext !== $contextid) {
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$contexts [] = $setreferencecontext;
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}
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}
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// Calculate the get the reference records.
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$referencecontexts = $DB->get_fieldset_sql("
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SELECT DISTINCT qc.contextid
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FROM {question_categories} qc
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JOIN {question_bank_entries} qbe ON qbe.questioncategoryid = qc.id
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JOIN {question_references} qr ON qr.questionbankentryid = qbe.id
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WHERE qr.usingcontextid =?", [$contextid]);
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foreach ($referencecontexts as $referencecontext) {
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if (!in_array($referencecontext, $contexts) && (int)$referencecontext !== $contextid) {
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$contexts [] = $referencecontext;
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}
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}
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// And now, simply insert all the question categories (complete question bank)
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// for those contexts if we have found any
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if ($contexts) {
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list($contextssql, $contextparams) = $DB->get_in_or_equal($contexts);
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$params = array_merge(array($backupid), $contextparams);
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$DB->execute("INSERT INTO {backup_ids_temp} (backupid, itemname, itemid)
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SELECT ?, 'question_category', id
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FROM {question_categories}
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WHERE contextid $contextssql", $params);
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}
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}
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/**
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* Delete all the annotated questions present in backup_ids_temp
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*/
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public static function delete_temp_questions($backupid) {
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global $DB;
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$DB->delete_records('backup_ids_temp', array('backupid' => $backupid, 'itemname' => 'question'));
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}
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}
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