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Delete entries from persistence [message #1695522] Fri, 15 May 2015 16:25 Go to next message
Smart Home is currently offline Smart HomeFriend
Messages: 109
Registered: February 2015
Senior Member
Persistence enables you to store data to a database. It doesn't have an interface to delete entries from it.

Do I need to directly access the database from my application to delete entries?

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Re: Delete entries from persistence [message #1695712 is a reply to message #1695522] Mon, 18 May 2015 14:21 Go to previous messageGo to next message
Kai Kreuzer is currently offline Kai KreuzerFriend
Messages: 673
Registered: December 2011
Senior Member
Yes, that is the current situation. Persistence services are primarily meant for time series of data - and what has been persisted once, is persisted, that's it.
So deleting entries is rather an administrative task in order to do clean up of invalid data possibly.
What would you need it for? In general, I am a bit afraid of ending up doing a generic database API when also adding full CRUD support...

Regards,
Kai

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Re: Delete entries from persistence [message #1695732 is a reply to message #1695712] Mon, 18 May 2015 16:54 Go to previous message
Smart Home is currently offline Smart HomeFriend
Messages: 109
Registered: February 2015
Senior Member
Hi Kai,

My concern is the storage size in limited resources device. How can you prevent from the persistence to fill up the storage?

I can delete the entries accessing the database directly but my problem is that the database is created and maintained by the persistence itself and it doesn't feel right to do so.

I don't think that we need the Update option, and Create and Read (query) are already there. For delete you can add something like delete(FilterCriteria) (maybe to a new interface DeleteablePersistenceService?),

Eyal

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