More advanced examples:

$params = Array(1, 'admin');
$users = $db->rawQuery("SELECT id, firstName, lastName FROM users WHERE id = ? AND login = ?", $params);
print_r($users); // contains Array of returned rows

// will handle any SQL query
$params = Array(10, 1, 10, 11, 2, 10);
$q = "(
SELECT a FROM t1
WHERE a = ? AND B = ?
ORDER BY a LIMIT ?
) UNION (
SELECT a FROM t2
WHERE a = ? AND B = ?
ORDER BY a LIMIT ?
)";
$resutls = $db->rawQuery ($q, $params);
print_r ($results); // contains Array of returned rows

Ordering method

$db->orderBy("id","asc");
$db->orderBy("login","Desc");
$db->orderBy("RAND ()");
$results = $db->get('users');