// Create and populate an object.
$value         = new stdClass();
$value->userid = (int)$userid;
$value->type   = $data['type'];

// Insert the object into the user profile table.
$handle = JFactory::getDbo()->insertObject('#__bestia_handles', $value);

$db                         =   JFactory::getDbo();

$db->insertObject(...)

$db->insertid();

MyComponentTableMyTable extends JTable
    {
        public function save($src, $orderingFilter= '', $ignore= '')
        {
            /*call parent save function and return either insertid or null depending on whether or not parent save function returns true or false */
            return ( parent::save ( $src, $orderingFilter, $ignore ) ? $_db->insertid () : NULL ) ;
        }
    }