I don't know what JDO will do, but I can tell you that this won't help you reduce data storage requirements, if that is your goal.
Some things to know about the Low-Level API, and thus any layer on top (JDO, JPA, Objectify, Twig, whatever): * Numeric keys will be persisted as a Long (or String). * All numeric property values get persisted as a Long (even if they get converted back to something smaller by the library). Jeff On Sat, Jan 16, 2010 at 5:59 AM, Bert Peters <[email protected]> wrote: > Thank you for that information, but that's not what i meant. > What i did mean is whether this is correct/possible: > > @PrimaryKey > @Persistent(idGeneratorStrategy=INCREMENT) > private Integer id; > > On Jan 16, 2:25 pm, jd <[email protected]> wrote: >> 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 <[email protected]> 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? > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine for Java" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/google-appengine-java?hl=en. > > > >
-- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
