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MDL-70023 core_course: improve performance of recently accessed courses

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This commit is contained in:
Marina Glancy 2020-10-26 12:23:23 +01:00
parent 15b4174a9f
commit 65d419b204
2 changed files with 55 additions and 11 deletions
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22
course/lib.php
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@ -4743,26 +4743,26 @@ function course_get_recent_courses(int $userid = null, int $limit = 0, int $offs
JOIN {user_lastaccess} ul
ON ul.courseid = c.id
$favsql
LEFT JOIN {enrol} eg ON eg.courseid = c.id AND eg.status = :statusenrolg AND eg.enrol = :guestenrol
WHERE ul.userid = :userid
AND c.visible = :visible
AND EXISTS (SELECT e.id
AND (eg.id IS NOT NULL
OR EXISTS (SELECT e.id
FROM {enrol} e
LEFT JOIN {user_enrolments} ue ON ue.enrolid = e.id
JOIN {user_enrolments} ue ON ue.enrolid = e.id
WHERE e.courseid = c.id
AND e.status = :statusenrol
AND ((ue.status = :status
AND ue.userid = ul.userid
AND ue.timestart < :now1
AND (ue.timeend = 0 OR ue.timeend > :now2)
)
OR e.enrol = :guestenrol
)
)
AND ue.status = :status
AND ue.userid = :userid2
AND ue.timestart < :now1
AND (ue.timeend = 0 OR ue.timeend > :now2)
))
$orderby";
$now = round(time(), -2); // Improves db caching.
$params = ['userid' => $userid, 'contextlevel' => CONTEXT_COURSE, 'visible' => 1, 'status' => ENROL_USER_ACTIVE,
'statusenrol' => ENROL_INSTANCE_ENABLED, 'guestenrol' => 'guest', 'now1' => $now, 'now2' => $now] + $favparams;
'statusenrol' => ENROL_INSTANCE_ENABLED, 'guestenrol' => 'guest', 'now1' => $now, 'now2' => $now,
'userid2' => $userid, 'statusenrolg' => ENROL_INSTANCE_ENABLED] + $favparams;
$recentcourses = $DB->get_records_sql($sql, $params, $offset, $limit);