public static function loadLinkInfo($link_id)
    {
        global $CFG, $PDOX, $CONTEXT;

        $cacheloc = 'lti_link';
        $row = Cache::check($cacheloc, $link_id);
        if ( $row != false ) return $row;
        $stmt = $PDOX->queryDie(
            "SELECT title FROM {$CFG->dbprefix}lti_link
                WHERE link_id = :LID AND context_id = :CID",
            array(":LID" => $link_id, ":CID" => $CONTEXT->id)
        );
        $row = $stmt->fetch(\PDO::FETCH_ASSOC);
        Cache::set($cacheloc, $link_id, $row);
        return $row;
    }