Db4o to preserve identity of objects?

From my experience, running the same query twice on the same ObjectContainer should return the same (identical) objects each time You should not close and reopen the ObjectContainer between the queries, if you need the objects' identity.

From my experience, running the same query twice on the same ObjectContainer should return the same (identical) objects each time. You should not close and reopen the ObjectContainer between the queries, if you need the objects' identity.

Db4o does use IDs and UUIDs internally and you can access those if needed. Also worth reading is this.

– Goran Oct 25 '09 at 17:46 I think this is a valid link: developer. Db4o.Com/Documentation/Reference/db4o-7.4/java/… – Karussell Mar 6 '10 at 18:20.

You can make an id for each object of yours by using it's UUIDs, I mean add an attribute ID for the object and give it UUIDs value and store it, to update an object you can retrieve it by that Id and update it.

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