$dal = new MongoDAL;
 $dal->db_connect("Rss_feeder");// database name
 
$items = array("id"=>"2","url"=>"foo");
 $dal->db_insert("cl_links",$items);

 $dal->db_delete("cl_links",array("id"=>"1"));
 
$dal->db_update("cl_links",array("id"=>"1"),array("id"=>"1","url"=>"ehsan"),true);
 $a = $dal->db_find("cl_links",array("id"=>true,"url"=>true),array("id"=>"2"));