class Db {

    private $db_host = '';
    private $db_user = '';
    private $db_pass = '';
    private $db_name = '';

    function __construct() {
        $dbh = mysql_connect($db_host, $db_user, $db_pass)
            or die("Unable to connect to MySQL");
        mysql_select_db($db_name, $dbh);
    }

    function getAgents() {
        $sqlquery = 'SELECT * FROM Agents';
        $result = mysql_query($sqlquery) or die(mysql_error());
        return $result;
    }
}