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