salvare le sessioni in un database

[rocco.mod]

salve ragazzi ho un problemone , dovrei riuscire a salvare le sessioni degli user in un databae , cioe l id di sessione il tempo , adesso avrei trovato una classe ma non so come farla funzionare posto la classe :

class session { 
    // session-lifetime 
    var $lifeTime; 
    // mysql-handle 
    var $dbHandle; 
    function open($savePath, $sessName) { 
       // get session-lifetime 
       $this->lifeTime = get_cfg_var("session.gc_maxlifetime"); 
       // open database-connection 
       $dbHandle = @mysql_connect("localhost","root","maurizio"); 
       $dbSel = @mysql_select_db("supp",$dbHandle); 
       // return success 
       if(!$dbHandle or !$dbSel) 
           return false; 
       $this->dbHandle = $dbHandle; 
       return true; 
    } 
    
    function close() { 
        $this->gc(ini_get('session.gc_maxlifetime')); 
        // close database-connection 
        return @mysql_close($this->dbHandle); 
    } 
    function read($sessID) { 
        // fetch session-data 
        $res = mysql_query("SELECT session_data AS d FROM sessions 
                            WHERE session_id = '$sessID' 
                            AND session_expires > ".time(),$this->dbHandle); 
        // return data or an empty string at failure 
        if($row = @mysql_fetch_assoc($res)) 
            return $row['d']; 
        return ""; 
    } 
    function write($sessID,$sessData) { 
        // new session-expire-time 
        $newExp = time() + $this->lifeTime; 
        // is a session with this id in the database? 
        $res = mysql_query("SELECT * FROM sessions 
                            WHERE session_id = '$sessID'",$this->dbHandle); 
        // if yes, 
        if(@mysql_num_rows($res)) { 
            // ...update session-data 
            mysql_query("UPDATE sessions 
                         SET session_expires = '$newExp', 
                         session_data = '$sessData' 
                         WHERE session_id = '$sessID'",$this->dbHandle); 
            // if something happened, return true 
            if(mysql_affected_rows($this->dbHandle)) 
                return true; 
        } 
        // if no session-data was found, 
        else { 
            // create a new row 
            mysql_query("INSERT INTO sessions ( 
                         session_id, 
                         session_expires, 
                         session_data) 
                         VALUES( 
                         '$sessID', 
                         '$newExp', 
                         '$sessData')",$this->dbHandle); 
            // if row was created, return true 
            if(mysql_affected_rows($this->dbHandle)) 
                return true; 
        } 
        // an unknown error occured 
        return false; 
    } 
    function destroy($sessID) { 
        // delete session-data 
        mysql_query("DELETE FROM sessions WHERE session_id = '$sessID'",$this->dbHandle); 
        // if session was deleted, return true, 
        if(mysql_affected_rows($this->dbHandle)) 
            return true; 
        // ...else return false 
        return false; 
    } 
    function gc($sessMaxLifeTime) { 
        // delete old sessions 
        @mysql_query("DELETE FROM sessions WHERE session_expires < ".time(),$this->dbHandle); 
        // return affected rows 
        return @mysql_affected_rows($this->dbHandle); 
    } 
}
// imposto la scadenza delle sessioni a 20 minuti
ini_set('session.gc_maxlifetime',20*60);
// imposto la probabilità di avvio del garbage collector al 50%
ini_set('session.gc_probability',50);
ini_set('session.gc_divisor',100);
@ini_set('session.save_handler', 'user');
$session = new session(); 
session_set_save_handler(array(&$session,"open"), 
                         array(&$session,"close"), 
                         array(&$session,"read"), 
                         array(&$session,"write"), 
                         array(&$session,"destroy"), 
                         array(&$session,"gc"));
session_start();
$_SESSION['user_login'];
$_SESSION['pass_password'];
session_id();                         ?> 

e questo e il controllo che faccio al lgin :

if(!file_exists("../config/config.php")){
    die("<div>il files config.php non e presente");
  }
else{
require_once("../config/config.php");
}
require_once("../include/funzion.php");
session_start();
$_SESSION['areaprivata_login'];
$_SESSION['areaprivata_password'];

if(!isset($_POST['action'])){$action="";}else{$action = $_POST['action'];}
if(!isset($_POST['login'])){$login="";}else{$login = trim(addslashes($_POST['login']));}
if(!isset($_POST['pass'])){$pass="";}else{$pass = trim(addslashes($_POST['pass']));}
if(isset($_POST['action'])=="control_administrator"){
$pass_cript = criptpass($pass);
$DB = new DB;
$DB->connect();
$controllo_Staff = mysql_query("SELECT * 
FROM `staff`
WHERE `nick` ='$login'
AND `pass` =  '$pass_cript'
AND   `stato` = 1 
AND   `tipo` = 2
OR     `tipo` = 3
OR     `tipo` = 4
LIMIT 0 , 1");
if(@mysql_num_rows($controllo_Staff)== 1){
session_start();
$_SESSION['areaprivata_login']=$login;
$_SESSION['areaprivata_password']=$pass_cript;
echo"[img]immagini/loading_bar.gif[/img]<meta http-equiv=\"Refresh\" content=\"3; URL=index.php\">Login effettuato correttamente . <a href=index.php>Clicca qui per entrare</a>";
}else{
 echo "<meta http-equiv=\"Refresh\" content=\"3; URL=index.php\">Login o password incorretti  . Torna all' Home Page<a href=index.php>Premi qui per riprovare</a>";
}
}