run same method multiple times

<?php

class article{
	
private $row;

public function __construct(){

require_once('connection.php'); 
mysql_select_db($db, $test);	

$query = "SELECT * FROM articles WHERE path = $_SESSION['path']";
$result = mysql_query($query, $test) or die(mysql_error());
$this->row = mysql_fetch_array($result);


}

public function process($field) {

if($field == 'tool'){
echo $this->row['path'];
}
else if($field == 'test'){
echo $this->row['title'];
}
 

}


}

$obj = new article();
$obj->process('tool');
$obj = new article();
$obj1->process('test');

?>