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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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* Common functions for the quiz statistics report.
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*
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* @package quiz_statistics
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* @copyright 2013 The Open University
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* @author James 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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use mod_quiz\quiz_attempt;
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defined('MOODLE_INTERNAL') || die;
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/**
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* SQL to fetch relevant 'quiz_attempts' records.
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*
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* @param int $quizid quiz id to get attempts for
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* @param \core\dml\sql_join $groupstudentsjoins Contains joins, wheres, params, empty if not using groups
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* @param string $whichattempts which attempts to use, represented internally as one of the constants as used in
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* $quiz->grademethod ie.
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* QUIZ_GRADEAVERAGE, QUIZ_GRADEHIGHEST, QUIZ_ATTEMPTLAST or QUIZ_ATTEMPTFIRST
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* we calculate stats based on which attempts would affect the grade for each student.
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* @param bool $includeungraded whether to fetch ungraded attempts too
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* @return array FROM and WHERE sql fragments and sql params
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*/
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function quiz_statistics_attempts_sql($quizid, \core\dml\sql_join $groupstudentsjoins,
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$whichattempts = QUIZ_GRADEAVERAGE, $includeungraded = false) {
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$fromqa = "{quiz_attempts} quiza ";
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$whereqa = 'quiza.quiz = :quizid AND quiza.preview = 0 AND quiza.state = :quizstatefinished';
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$qaparams = ['quizid' => (int)$quizid, 'quizstatefinished' => quiz_attempt::FINISHED];
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if (!empty($groupstudentsjoins->joins)) {
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$fromqa .= "\nJOIN {user} u ON u.id = quiza.userid
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{$groupstudentsjoins->joins} ";
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$whereqa .= " AND {$groupstudentsjoins->wheres}";
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$qaparams += $groupstudentsjoins->params;
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}
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$whichattemptsql = quiz_report_grade_method_sql($whichattempts);
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if ($whichattemptsql) {
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$whereqa .= ' AND ' . $whichattemptsql;
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}
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if (!$includeungraded) {
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$whereqa .= ' AND quiza.sumgrades IS NOT NULL';
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}
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return [$fromqa, $whereqa, $qaparams];
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}
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/**
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* Return a {@link qubaid_condition} from the values returned by {@link quiz_statistics_attempts_sql}.
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*
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* @param int $quizid
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* @param \core\dml\sql_join $groupstudentsjoins Contains joins, wheres, params
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* @param string $whichattempts which attempts to use, represented internally as one of the constants as used in
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* $quiz->grademethod ie.
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* QUIZ_GRADEAVERAGE, QUIZ_GRADEHIGHEST, QUIZ_ATTEMPTLAST or QUIZ_ATTEMPTFIRST
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* we calculate stats based on which attempts would affect the grade for each student.
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* @param bool $includeungraded
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* @return \qubaid_join
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*/
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function quiz_statistics_qubaids_condition($quizid, \core\dml\sql_join $groupstudentsjoins,
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$whichattempts = QUIZ_GRADEAVERAGE, $includeungraded = false) {
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list($fromqa, $whereqa, $qaparams) = quiz_statistics_attempts_sql(
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$quizid, $groupstudentsjoins, $whichattempts, $includeungraded);
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return new qubaid_join($fromqa, 'quiza.uniqueid', $whereqa, $qaparams);
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}
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