/**
* Load the data that will be needed to perform the calculations.
*
* @param int $offlinequizid the offlinequiz id.
* @param int $currentgroup the current group. 0 for none.
* @param array $groupstudents students in this group.
* @param bool $allattempts use all attempts, or just first attempts.
*/
public function load_step_data($offlinequizid, $currentgroup, $groupstudents, $allattempts, $offlinegroupid)
{
global $DB;
$this->allattempts = $allattempts;
$questionids = array();
foreach ($this->questions as $question) {
$questionids[] = $question->id;
}
// Get the SQL and params for question IDs.
list($qsql, $qparams) = $DB->get_in_or_equal($questionids, SQL_PARAMS_NAMED, 'q');
list($fromqa, $whereqa, $qaparams) = offlinequiz_statistics_attempts_sql($offlinequizid, $currentgroup, $groupstudents, $allattempts, false, $offlinegroupid);
// Trying to make this work on MySQL
// First we get the questionattemptids that we actually need.
$questionattemptids = $DB->get_fieldset_sql("\n SELECT qa.id\n FROM {$fromqa}\n JOIN {question_attempts} qa ON qa.questionusageid = offlinequiza.usageid\n WHERE qa.questionid {$qsql}\n AND {$whereqa}", $qparams + $qaparams);
list($qaidssql, $qaidsparams) = $DB->get_in_or_equal($questionattemptids, SQL_PARAMS_NAMED, 'qaid');
$params = array_merge($qparams, $qaparams, $qaidsparams);
// Works already quite a bit faster.
$this->lateststeps = $DB->get_records_sql("\n SELECT\n qas.id,\n offlinequiza.sumgrades,\n qa.questionid,\n qa.slot,\n qa.maxmark,\n qas.fraction * qa.maxmark as mark\n\n FROM {$fromqa}\n JOIN {question_attempts} qa ON qa.questionusageid = offlinequiza.usageid\n JOIN (\n SELECT questionattemptid, MAX(id) AS latestid\n FROM {question_attempt_steps} qass\n WHERE qass.questionattemptid {$qaidssql}\n GROUP BY questionattemptid\n ) lateststepid ON lateststepid.questionattemptid = qa.id\n JOIN {question_attempt_steps} qas ON qas.id = lateststepid.latestid\n\n WHERE\n qa.questionid {$qsql} AND\n {$whereqa}", $params);
}
/**
* Generate the snipped of HTML that says when the stats were last caculated,
* with a recalcuate now button.
* @param object $offlinequizstats the overall offlinequiz statistics.
* @param int $offlinequizid the offlinequiz id.
* @param int $currentgroup the id of the currently selected group, or 0.
* @param array $groupstudents ids of students in the group.
* @param bool $useallattempts whether to use all attempts, instead of just
* first attempts.
* @return string a HTML snipped saying when the stats were last computed,
* or blank if that is not appropriate.
*/
protected function output_caching_info($offlinequizstats, $offlinequizid, $currentgroup, $groupstudents, $useallattempts, $reporturl, $offlinegroupid)
{
global $DB, $OUTPUT;
if (empty($offlinequizstats->timemodified)) {
return '';
}
// Find the number of attempts since the cached statistics were computed.
list($fromqa, $whereqa, $qaparams) = offlinequiz_statistics_attempts_sql($offlinequizid, $currentgroup, $groupstudents, $useallattempts, true, false, $offlinegroupid);
$count = $DB->count_records_sql("\n SELECT COUNT(1)\n FROM {$fromqa}\n WHERE {$whereqa}\n AND offlinequiza.timefinish > {$offlinequizstats->timemodified}", $qaparams);
if (!$count) {
$count = 0;
}
// Generate the output.
$a = new stdClass();
$a->lastcalculated = format_time(time() - $offlinequizstats->timemodified);
$a->count = $count;
$recalcualteurl = new moodle_url($reporturl, array('recalculate' => 1, 'sesskey' => sesskey()));
$output = '<br/>';
$output .= $OUTPUT->box_start('boxaligncenter generalbox boxwidthnormal mdl-align', 'cachingnotice');
$output .= get_string('lastcalculated', 'offlinequiz_statistics', $a);
$output .= $OUTPUT->single_button($recalcualteurl, get_string('recalculatenow', 'offlinequiz_statistics'));
$output .= $OUTPUT->box_end(true);
return $output;
}
