[TYPO3-mvc] best way to query other database readonly from extbase extension

[Philipp]

Simply use repository that is not inherited from Extbase\Repository

@var \Vendor\Extension\Domain\Repository\ExternalRepository
@inject
protected $repository;

public function indexAction() {
$this->view->assign('objects',$this->repository->find());
}

class ExternalRepository implements \TYPO3\CMS\Core\SingletonInterface {
public function initialize() {
build connection to persistence;
}

public function find(array $settings=NULL){
add constraints based on settings
}
}

and of course you could map your data into Domainmodels but i dont think its neccessary in your case.