public function testPGetCol()
{
$rs = $this->db->PGetCol('SELECT * From Country WHERE Continent=? AND Population < ?', 'Oceania', 10000);
$this->assertEquals(7, count($rs));
$this->assertEquals(array('CCK', 'CXR', 'NFK', 'NIU', 'PCN', 'TKL', 'UMI'), $rs);
}