Hmm, I thought I'd read that in the DataNucleus documentation, but I can't find any clear definition of it. I must have just assumed sequences were sequential.
Borrowing from your example here (http://code.google.com/p/datanucleus- appengine/source/browse/trunk/tests/org/datanucleus/test/ SequenceExamplesJDO.java), it seems if I specify a named sequence and set SequenceStrategy.CONTIGUOUS (NONCONTIGUOUS might work too, I'm guessing !TRANSACTIONAL is the key) that I get a monotonically increasing sequence. Does that seem right? Thanks for the input, Philip On Dec 21, 2:46 pm, "Max Ross (Google)" <[email protected]> wrote: > Where are you reading the definition of the contract? > > > > On Mon, Dec 21, 2009 at 2:41 PM, Philip Tucker <[email protected]> wrote: > > Thanks! > > > Unless I'm misreading the documentation for SEQUENCE, that breaks the > > contract of the JDP annotation API, doesn't it? > > > Is there a way to annotate a field as a true sequence, or do I need to > > create my own sequence and assign the value myself? > > > On Dec 21, 9:29 am, "Max Ross (Google)" > > <[email protected]<maxr%[email protected]> > > > wrote: > > > Hi Philip, > > > > IdGeneratorStrategy.SEQUENCE support is implemented on top of > > > DatastoreService.allocateIds(), which is itself the mechanism that the > > > datastore uses internally to assign ids. So, all properties of datastore > > id > > > allocation apply to SEQUENCE. There is a lot of good information about > > > these properties in this thread: > >http://groups.google.com/group/google-appengine/browse_thread/thread/... > > > > But in short, sequences are guaranteed to be unique but not monotically > > > increasing. > > > > Hope this helps, > > > Max > > > > On Mon, Dec 21, 2009 at 12:04 AM, Philip Tucker <[email protected]> > > wrote: > > > > I'm using IdGeneratorStrategy.SEQUENCE for the primary key of a table, > > > > but it appears AppEngine bounces between 2 different sequence > > > > generators as I create new entries. IDs are unique, but not > > > > monotonically increasing. It's possible I've coded something wrong, > > > > but I'm oretty sure this is a bug. > > > > > -- > > > > > 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]<google-appengine-java%2B > > > > [email protected]><google-appengine-java%2B > > [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]<google-appengine-java%2B > > [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.
