Hi Vaninho What is "Objectify"?
I am a Chinese, and I search "Objectify" by google , I can't search Chinese material. The Chinese material about "Objectify" is very few. And the English material, I read it, and still can't understand it. Could you tell me the simple explanation about "Objectify"? Thanks for your reply. Best Regards Tinker 2010/11/24 vaninh0 <[email protected]> > Hi Tinker, > > It´s just a suggestion, use the Objectify. > I've changed my project and the things are really better now! > > On 23 nov, 03:15, Tinker Pang <[email protected]> wrote: > > Hi didier > > > > I have the same question, too > > > > When I creat the parent Key > > > > How can I get the parent via Key? > > > > I tested many times and many ways, I can't get the parent, > > > > And why use Key to build entity relation? Could I use other type? for > > example int long string? > > > > Best Regards > > Tinker > > > > 2010/11/23 Didier Durand <[email protected]> > > > > > Hi Vaninho, > > > > > If you want to group some A, B & C entities in the same entity group, > > > you have to say (for example) that A is a parent of B (via a @Parent > > > Key<A> key in B) and then that B is a parent of C (via a @Parent > > > Key<B> in C). > > > > > You can add @Transient if you don't want the Keys to be stored as > > > properties of the entity > > > > > Then you can query with ancestor() filter. > > > > > regards > > > didier > > > > > On Nov 22, 9:10 pm, Jeff Schnitzer <[email protected]> wrote: > > > > This doesn't make any sense; entities in the GAE datastore cannot > have > > > > multiple *parent* keys. However, your structure would work fine if > > > > you just dropped the @Parent annotation. > > > > > > This may help: > > >http://code.google.com/p/objectify-appengine/wiki/Concepts#Keys > > > > > > Jeff > > > > > > On Mon, Nov 22, 2010 at 10:22 AM, vaninh0 <[email protected]> wrote: > > > > > Hi Didier, > > > > > > > with Objectify is possible to create a Entity with two distinct > > > > > childrens? > > > > > > > example: > > > > > > > class A { > > > > > @Id Long Id; > > > > > } > > > > > class B { > > > > > @Id Long Id; > > > > > } > > > > > class C { > > > > > @Id Long Id; > > > > > @Parent Key<A> a; > > > > > @Parent Key<B> b; > > > > > } > > > > > > > regards, > > > > > vanio. > > > > > > > On 20 nov, 14:41, Didier Durand <[email protected]> wrote: > > > > >> Hi, > > > > > > >> I would recommend Objectify (which I use heavily): seems to match > your > > > > >> need. > > > > > > >> regards > > > > >> didier > > > > > > >> On Nov 20, 1:20 pm, Roberto Saccon <[email protected]> wrote: > > > > > > >> > maybe a good place to start is sourcecode of lowlevel-based > > > frameworks > > > > >> > like slim3 or objectify > > > > >> > -- > > > > >> > Roberto > > > > > > >> > On Nov 20, 8:13 am, Tom <[email protected]> wrote: > > > > > > >> > > Hi there, > > > > > > >> > > I'm searching for information of entity relation ships in > > > appengine. > > > > >> > > JPA for example supports relations between entites > (one-to-one, > > > > >> > > ont-to-many, many-to-many). As far as I know by know the > > > underlying > > > > >> > > datastore doesn't direktly support this and not join queries > > > (different > > > > >> > > entities). > > > > > > >> > > How do you store Customer -> Orders in the datastore? Is there > low > > > > >> > > level API example code? > > > > >> > > Would I store an entity "Customer" with attributes and a list > of > > > order > > > > >> > > ids? > > > > > > >> > > Any help highly appreciated. > > > > >> > > Thanks > > > > >> > > Tom > > > > > > > -- > > > > > 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%[email protected]> > <google-appengine-java%[email protected]<google-appengine-java%[email protected]> > > > > > . > > > > > For more options, visit this group athttp:// > > > 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%[email protected]> > <google-appengine-java%[email protected]<google-appengine-java%[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%[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. 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