public function __construct($arg = NULL, $p_forceExists = false)
{
parent::__construct($this->m_columnNames);
if (is_array($arg)) {
$this->fetch($arg, $p_forceExists);
} else {
if (is_numeric($arg)) {
$this->m_data['id'] = (int) $arg;
$this->fetch();
}
}
}