mirror of
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52 lines
1.9 KiB
PHP
52 lines
1.9 KiB
PHP
<?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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* Functions common to the question usage statistics code.
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*
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* @package moodlecore
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* @subpackage questionbank
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* @copyright 2013 The Open University
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* @author Jamie Pratt <me@jamiep.org>
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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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defined('MOODLE_INTERNAL') || die();
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/**
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* Question statistics cron code. Deletes cached stats more than a certain age.
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*/
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function question_usage_statistics_cron() {
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global $DB;
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$expiretime = time() - 5 * HOURSECS;
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mtrace("\n Cleaning up old question statistics cache records...", '');
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$DB->delete_records_select('question_statistics', 'timemodified < ?', array($expiretime));
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$responseanlysisids = $DB->get_records_select_menu('question_response_analysis',
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'timemodified < ?',
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array($expiretime),
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'id',
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'id, id AS id2');
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$DB->delete_records_list('question_response_analysis', 'id', $responseanlysisids);
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$DB->delete_records_list('question_response_count', 'analysisid', $responseanlysisids);
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mtrace('done.');
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return true;
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}
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