troubles with db classes

Hello all,
I'm having trouble using DB classes from inside other classes. The below
code doesn't work and I couldn't be able to figure out why. Can anybody
help?

var_dump of $handle always return db_error instance information with
no particular detail. (DNS_DATABASE==pgsql)

thanks,
-bd

<?php

        require_once("DB.php");
        require_once("/code/config.php");

class sample {
        var $dbHandle;
        function sample(&$database) {
                $this->dbHandle=$database;
        }

        function execute() {
                $query="insert into host values (9,'test','test')";
                $handle=$this->dbHandle->simplequery($query);
                var_dump($handle);
        }
}

$dsn=array(phptype=>DNS_DATABASE,hostspec=>"localhost",database=>"dns");
$database=DB::connect($dsn);

$x=new sample(&$database);
$x->execute();

?>