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MDL-54582 accesslib: improve performance of load_course_context

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The new query is logically equivalen, but much, much faster, at
least on Postgred. (15ms, instead of 700ms, in one example I tried
on the database for the OU's main Moodle site.)
This commit is contained in:
Tim Hunt
2016-05-13 20:36:30 +01:00
parent 65cbefc403
commit 795efd9c1b
1 changed files with 4 additions and 7 deletions
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11
lib/accesslib.php
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@@ -980,20 +980,17 @@ function load_course_context($userid, context_course $coursecontext, &$accessdat
}
// now get overrides of interesting roles in all interesting contexts (this course + children + parents)
$params = array('c'=>$coursecontext->id);
$params = array('pathprefix' => $coursecontext->path . '/%');
list($parentsaself, $rparams) = $DB->get_in_or_equal($coursecontext->get_parent_context_ids(true), SQL_PARAMS_NAMED, 'pc_');
$params = array_merge($params, $rparams);
list($roleids, $rparams) = $DB->get_in_or_equal($roles, SQL_PARAMS_NAMED, 'r_');
$params = array_merge($params, $rparams);
$sql = "SELECT ctx.path, rc.roleid, rc.capability, rc.permission
FROM {role_capabilities} rc
JOIN {context} ctx
ON (ctx.id = rc.contextid)
JOIN {context} cctx
ON (cctx.id = :c
AND (ctx.id $parentsaself OR ctx.path LIKE ".$DB->sql_concat('cctx.path',"'/%'")."))
FROM {context} ctx
JOIN {role_capabilities} rc ON rc.contextid = ctx.id
WHERE rc.roleid $roleids
AND (ctx.id $parentsaself OR ctx.path LIKE :pathprefix)
ORDER BY rc.capability"; // fixed capability order is necessary for rdef dedupe
$rs = $DB->get_recordset_sql($sql, $params);