class.ilCache.php

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<?php
/*
        +-----------------------------------------------------------------------------+
        | ILIAS open source                                                           |
        +-----------------------------------------------------------------------------+
        | Copyright (c) 1998-2006 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 ilCache
{
        private $module = "";
        
        function __construct($a_module = "common")
        {
                global $ilDB;
                
                $this->module = $a_module;
        }
        
        public function getValue($a_keyword)
        {
                global $ilDB;
                $query = sprintf("SELECT * FROM data_cache WHERE module = %s AND keyword = %s",
                        $ilDB->quote($this->module),
                        $ilDB->quote($a_keyword)
                );
                $res = $ilDB->query($query);

                if ($res->numRows() == 1) 
                {
                        $row = $res->fetchRow(DB_FETCHMODE_ASSOC);
                        return $row["value"];
                }
                else
                {
                        return NULL;
                }
        }
        
        public function getValueForModule($a_module, $a_keyword)
        {
                global $ilDB;
                $query = sprintf("SELECT * FROM data_cache WHERE module = %s AND keyword = %s",
                        $ilDB->quote($a_module),
                        $ilDB->quote($a_keyword)
                );
                $res = $ilDB->query($query);

                if ($res->numRows() == 1) 
                {
                        $row = $res->fetchRow(DB_FETCHMODE_ASSOC);
                        return $row["value"];
                }
                else
                {
                        return NULL;
                }
        }
        
        public function deleteAll($a_module = "")
        {
                global $ilDB;
                
                $module = (strlen($a_module) ? $a_module : $this->module);
                $query = sprintf("DELETE FROM data_cache WHERE module = %s",
                        $ilDB->quote($module)
                );
                $ilDB->query($query);
        }
        
        public function deleteValue($a_keyword)
        {
                global $ilDB;

                $query = sprintf("DELETE FROM data_cache WHERE keyword = %s AND module = %s",
                        $ilDB->quote($a_keyword),
                        $ilDB->quote($this->module)
                );
                $ilDB->query($query);
        }
        
        public function setValue($a_key, $a_val)
        {
                global $ilDB, $ilLog;
                
                $sql = sprintf("DELETE FROM data_cache WHERE keyword = %s AND module = %s",
                        $ilDB->quote($a_key),
                        $ilDB->quote($this->module)
                );
                $ilDB->query($sql);

                $sql = sprintf("INSERT INTO data_cache (module, keyword, value) VALUES (%s, %s, %s)",
                        $ilDB->quote($this->module),
                        $ilDB->quote($a_key),
                        $ilDB->quote($a_val)
                );
                $ilDB->query($sql);
        }

}
?>