session存储到mysql数据库_MySQL

<?phpini_set('error_reporting',E_ALL);ini_set('display_errors',TRUE);class session{const db_host = '127.0.0.1';const db_user = 'root';const db_password ='';const db_name = 'test';const db_table = 'tbl_session';private $lifetime;private $dbHandle;function open($path,$id){  $con = @mysql_connect(self::db_host,self::db_user,self::db_password);  $sel = @mysql_select_db(self::db_name,$con);  $this->lifetime = get_cfg_var("session.gc_maxlifetime");  $this->dbHandle = $con;  if(!$con || !$sel)      return false;      return true; }function close(){    $this->gc($this->lifetime);	return @mysql_close($this->dbHandle);}function read($id){   $rs = @mysql_query("select session_data data from ".self::db_table." where session_expires < ".time(),$this->dbHandle);    $row = @mysql_fetch_assoc($rs);	return $row?$row['data']:'';}function write($id,$data){	$newEXP = time()+ ini_get("session.gc_maxlifetime");   $sel = mysql_query("select * from ".self::db_table." where session_id= '".$id."'",$this->dbHandle);   if(mysql_affected_rows($this->dbHandle)){     $rs = @mysql_query("update ".self::db_table." set session_data = '".$data."', session_expires = '".$newEXP."' WHERE session_id = '".$id."'",$this->dbHandle);	  if(@mysql_affected_rows($this->dbHandle))		  return true;   }else{     $rs = @mysql_query("insert into ".self::db_table." (session_id,session_data,session_expires)values('".$id."','".$data."','".$newEXP."')",$this->dbHandle);	 if(@mysql_affected_rows($rs))		 return true;   }   return false;}function destroy($id){	@mysql_query("delete from ".self::db_table." where session_id = '".$id."'",$this->dbHandle);}function gc($lifetime){    @mysql_query("delete from ".self::db_table." where sessoin_expires > '".time()."'",$this->dbHandle);}}$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();