Transport package: Modifying tables on update

if ($object->xpdo) {
    switch ($options[xPDOTransport::PACKAGE_ACTION]) {
        case xPDOTransport::ACTION_UPGRADE:
            $modx =& $object->xpdo;
            $modelPath = $modx->getOption('quip.core_path',null,$modx->getOption('core_path').'components/quip/').'model/';
            $modx->addPackage('quip',$modelPath);

            /* add name,email,website fields */
            $modx->exec("ALTER TABLE {$modx->getTableName('quipComment')} ADD `name` VARCHAR(255) NOT NULL default ''");
            $modx->exec("ALTER TABLE {$modx->getTableName('quipComment')} ADD `email` VARCHAR(255) NOT NULL default ''");
            $modx->exec("ALTER TABLE {$modx->getTableName('quipComment')} ADD `website` VARCHAR(255) NOT NULL default ''");

            /* more stuff ...*/
            break;
    }
}
return true;