class.ilRating.php

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<?php
/*
        +-----------------------------------------------------------------------------+
        | ILIAS open source                                                           |
        +-----------------------------------------------------------------------------+
        | Copyright (c) 1998-2008 ILIAS open source, University of Cologne            |
        |                                                                             |
        | This program is free software; you can redistribute it and/or               |
        | modify it under the terms of the GNU General Public License                 |
        | as published by the Free Software Foundation; either version 2              |
        | of the License, or (at your option) any later version.                      |
        |                                                                             |
        | This program is distributed in the hope that it will be useful,             |
        | but WITHOUT ANY WARRANTY; without even the implied warranty of              |
        | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               |
        | GNU General Public License for more details.                                |
        |                                                                             |
        | You should have received a copy of the GNU General Public License           |
        | along with this program; if not, write to the Free Software                 |
        | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. |
        +-----------------------------------------------------------------------------+
*/

class ilRating
{
        static function writeRatingForUserAndObject($a_obj_id, $a_obj_type, $a_sub_obj_id, $a_sub_obj_type,
                $a_user_id, $a_rating)
        {
                global $ilDB;

                if ($a_user_id == ANONYMOUS_USER_ID)
                {
                        return;
                }

                $q = "REPLACE INTO il_rating (user_id, obj_id, obj_type,".
                        "sub_obj_id, sub_obj_type, rating) VALUES (".
                        $ilDB->quote($a_user_id).",".
                        $ilDB->quote($a_obj_id).",".
                        $ilDB->quote($a_obj_type).",".
                        $ilDB->quote($a_sub_obj_id).",".
                        $ilDB->quote($a_sub_obj_type).",".
                        $ilDB->quote($a_rating).")";
                $ilDB->query($q);
        }
        
        static function getRatingForUserAndObject($a_obj_id, $a_obj_type, $a_sub_obj_id, $a_sub_obj_type,
                $a_user_id)
        {
                global $ilDB;
                
                $q = "SELECT * FROM il_rating WHERE ".
                        "user_id = ".$ilDB->quote($a_user_id)." AND ".
                        "obj_id = ".$ilDB->quote($a_obj_id)." AND ".
                        "obj_type = ".$ilDB->quote($a_obj_type)." AND ".
                        "sub_obj_id = ".$ilDB->quote($a_sub_obj_id)." AND ".
                        "sub_obj_type = ".$ilDB->quote($a_sub_obj_type);
                $set = $ilDB->query($q);
                $rec = $set->fetchRow(DB_FETCHMODE_ASSOC);
                return $rec["rating"];
        }
        
        static function getOverallRatingForObject($a_obj_id, $a_obj_type, $a_sub_obj_id, $a_sub_obj_type)
        {
                global $ilDB;
                
                $q = "SELECT count(*) as cnt, AVG(rating) as av FROM il_rating WHERE ".
                        "obj_id = ".$ilDB->quote($a_obj_id)." AND ".
                        "obj_type = ".$ilDB->quote($a_obj_type)." AND ".
                        "sub_obj_id = ".$ilDB->quote($a_sub_obj_id)." AND ".
                        "sub_obj_type = ".$ilDB->quote($a_sub_obj_type);
                $set = $ilDB->query($q);
                $rec = $set->fetchRow(DB_FETCHMODE_ASSOC);
                return array("cnt" => $rec["cnt"], "avg" => $rec["av"]);
        }

}

?>