$_data = array(
        'firstname' => 'Janez',
        'lastname'  => 'Novak',
        'address'   => 'Dunajska 11',
        'zip'       => 1111,
        'post'      => 'Ljubljana'
    );

    $customer = new Customer( $_data );

    // save to db
    $customer = $customer->create();

    $id = $customer->id;

    // read from db
    $customer->read( $id );

    // update to db
    $customer->update( $id, array(
        'firstname' => 'Bostjan'
    ));

    // delete from db
    $customer->delete( $id );

    // read all from db and return customer object
    $customers = $customer->readAll();

    dump( $customers );