BasicDBObject copy() vs. clone() ?

[ikevinjp]

What is the difference between BasicDBObject's copy() and clone()
method?

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Say, I need to query an existing document from CollectionA. After
retrieving it, I need to change the _id and insert into CollectionB
(and delete the one in Collectinon A as well).

So, I would suppose that I first retrieve it, make a copy() or clone()
- which one ?? - and then use the copied/cloned version to change the
_id, and insert into CollectionB. Then, delete the originally retrieve
object from CollectionA.

---

Kevin.

[Karl Seguin]

As a general rule, in Java clone is almost always a shallow copy. If you want to separate objects which really have nothing to do with each other, except for the fact that one started off as a duplicate of another (which sounds like what you want), stick with copy (which is custom-implemented in the mongo driver to do a deep copy).

Karl