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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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namespace qbank_usage;
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/**
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* Helper class for usage.
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*
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* @package qbank_usage
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* @copyright 2021 Catalyst IT Australia Pty Ltd
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* @author Safat Shahin <safatshahin@catalyst-au.net>
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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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class helper {
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/**
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* Get the usage count for a question.
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*
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* @param \question_definition $question
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* @param bool $specificversion Count usages just for this version of the question?
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* @return int
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*/
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public static function get_question_entry_usage_count($question, bool $specificversion = false) {
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global $DB;
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$sql = 'SELECT COUNT(*) FROM (' . self::question_usage_sql($specificversion) . ') quizid';
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$params = [$question->id, $question->questionbankentryid, 'mod_quiz', 'slot'];
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if ($specificversion) {
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$params[] = $question->id;
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}
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return $DB->count_records_sql($sql, $params);
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}
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/**
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* Get the sql for usage data.
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*
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* @param bool $specificversion Count usages just for this version of the question?
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* @return string
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*/
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public static function question_usage_sql(bool $specificversion = false): string {
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$sqlset = "(". self::get_question_attempt_usage_sql($specificversion) .")".
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"UNION".
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"(". self::get_question_bank_usage_sql($specificversion) .")";
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return $sqlset;
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}
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/**
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* Get question attempt count for the question.
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*
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* @param int $questionid
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* @param int $quizid
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* @return int
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*/
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public static function get_question_attempts_count_in_quiz(int $questionid, $quizid = null): int {
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global $DB;
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if ($quizid) {
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$sql = 'SELECT COUNT(qatt.id)
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FROM {quiz} qz
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JOIN {quiz_attempts} qa ON qa.quiz = qz.id
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JOIN {question_usages} qu ON qu.id = qa.uniqueid
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JOIN {question_attempts} qatt ON qatt.questionusageid = qu.id
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JOIN {question} q ON q.id = qatt.questionid
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WHERE qatt.questionid = :questionid
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AND qa.preview = 0
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AND qz.id = :quizid';
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$param = ['questionid' => $questionid, 'quizid' => $quizid];
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} else {
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$sql = 'SELECT COUNT(qatt.id)
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FROM {quiz_slots} qs
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JOIN {quiz_attempts} qa ON qa.quiz = qs.quizid
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JOIN {question_usages} qu ON qu.id = qa.uniqueid
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JOIN {question_attempts} qatt ON qatt.questionusageid = qu.id
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JOIN {question} q ON q.id = qatt.questionid
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WHERE qatt.questionid = ?
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AND qa.preview = 0';
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$param = ['questionid' => $questionid];
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}
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return $DB->count_records_sql($sql, $param);
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}
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/**
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* Get the question bank usage sql.
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*
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* The resulting string which represents a sql query has then to be
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* called accompanying a $params array which includes the necessary
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* parameters in the correct order which are the question id, then
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* the component and finally the question area.
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*
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* @param bool $specificversion Count usages just for this version of the question?
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* @return string
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*/
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public static function get_question_bank_usage_sql(bool $specificversion = false): string {
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$sql = "SELECT qz.id as quizid,
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qz.name as modulename,
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qz.course as courseid
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FROM {quiz_slots} slot
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JOIN {quiz} qz ON qz.id = slot.quizid
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JOIN {question_references} qr ON qr.itemid = slot.id
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JOIN {question_bank_entries} qbe ON qbe.id = qr.questionbankentryid
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JOIN {question_versions} qv ON qv.questionbankentryid = qbe.id
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WHERE qv.questionbankentryid = ?
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AND qr.component = ?
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AND qr.questionarea = ?";
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if ($specificversion) {
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// Only get results where the reference matches the specific question ID that was requested,
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// or the question ID that's requested is the latest version, and the reference is set to null (always latest version).
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$sql .= " AND qv.questionid = ?
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AND (
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qv.version = qr.version
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OR (
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qr.version IS NULL
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AND qv.version = (
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SELECT MAX(qv1.version)
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FROM {question_versions} qv1
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WHERE qv1.questionbankentryid = qbe.id
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)
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)
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)";
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}
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return $sql;
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}
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/**
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* Get the question attempt usage sql.
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*
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* The resulting string which represents a sql query has then to be
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* called accompanying a $params array which includes the necessary
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* parameter, the question id.
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*
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* @param bool $specificversion Count usages just for this version of the question?
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* @return string
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*/
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public static function get_question_attempt_usage_sql(bool $specificversion = false): string {
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$sql = "SELECT qz.id as quizid,
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qz.name as modulename,
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qz.course as courseid
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FROM {quiz} qz
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JOIN {quiz_attempts} qa ON qa.quiz = qz.id
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JOIN {question_usages} qu ON qu.id = qa.uniqueid
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JOIN {question_attempts} qatt ON qatt.questionusageid = qu.id";
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if ($specificversion) {
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$sql .= "
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JOIN {question} q ON q.id = qatt.questionid
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WHERE qa.preview = 0
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AND q.id = ?";
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} else {
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$sql .= "
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JOIN {question_versions} qv ON qv.questionid = qatt.questionid
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JOIN {question_versions} qv2 ON qv.questionbankentryid = qv2.questionbankentryid
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WHERE qa.preview = 0
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AND qv2.questionid = ?";
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}
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return $sql;
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}
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/**
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* Get the question last used sql.
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*
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* @return string
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*/
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public static function get_question_last_used_sql(): string {
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$sql = "SELECT MAX(qa.timemodified) as lastused
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FROM {quiz} qz
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JOIN {quiz_attempts} qa ON qa.quiz = qz.id
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JOIN {question_usages} qu ON qu.id = qa.uniqueid
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JOIN {question_attempts} qatt ON qatt.questionusageid = qu.id
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JOIN {question} q ON q.id = qatt.questionid
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WHERE qa.preview = 0
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AND q.id = ?";
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return $sql;
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}
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}
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