Keys can either have a system generated long "id" (not set by you) or a String "name".
There used to be no way to create an Entity with a long - but now (as of 1.2.7?) there is a constructor Entity(Key) and you can create a key with a long. But the docs say: "Creating an entity for the purpose of insertion (as opposed to update) with a key that has its id field set is strongly discouraged unless the key was returned by a KeyRange." So basically the answer is still no. Twig gets around this by converting whatever field you declare as a @Key into a String and back again - even Integers. On Jan 16, 7:02 pm, Bert Peters <bert.ljpet...@gmail.com> wrote: > I was just wondering whether I could use an Integer for a primary key > in JDO, as it would be a great convenience in my application. > I couldn't really find an answer to this in the documentation, so I > ask you. Can I?
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