CODEWITHSUNDEEP
google-app-engineobjectify
zee
zee

Reputation: 502

How to Retrieve The Only Stored Entity From DataStore using Obectify efficiently

I know only one entity of a specific kind is stored in datastore at a time. How do i retrieve this entity using objectify v4 . what load query/operation will do this. I dont know the ID of entity, so cant query by ID.

I am currently using ofy().load.type(MyObject.class).list();

Is there a better option.

Thank you

Upvotes: 0

Views: 48

Answers (2)

stickfigure
stickfigure

Reputation: 13556

If you don't know the key, get the key. Cache it in a static (application-scoped) variable in your app. This is one keys-only query the first time you need the value in an instance.

Then load the value by key directly each time. Make sure you have @Cache on the entity class. Your load-by-key operation will effectively be a memcache hit every time.

Upvotes: 0

elcid
elcid

Reputation: 574

If you don't know the Id of the entity then the other option is to query by the entity's Key, which can be achieved as follows:

MyObject entity = ofy().load().key(myObjectKey).now();

Upvotes: 0

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