[TYPO3-mvc] How to use the repository within a hook?

[S.Korth]

Hey all,

sorry that's my X Question/Answer on this topic, but i need to know 
something. I understand that if i want to use xy->findAll() i need to 
build my own query within the repository, because of the missing Storage 
ID ($query->getQuerySettings()->setRespectStoragePage(false);)

But how to update or delete an Object? At the moment i uses the "old" 
way. How to use Extbase for that,too ?

Thanks
Sascha