@Tinker Objectify is a framework used to replace JDO or JPA: it works at an intermediate level of abstraction between the low-level datastore api and the high-level of JDO-JPA.
I use it heavily (with high satisfaction): it is very stable and efficient to access the data. It is much simpler to apprehend than JDO and well supported in its own support group. If you feel overwhelmed by JDO/JPA or if you feel that JDO/JPA mechanisms are too opaque, give it a try! regards didier On Nov 24, 1:31 pm, Liang Ding <[email protected]> wrote: > Hi, Tinker Pang, I am a Chinese 2. > > 你可以看看这个：http://code.google.com/p/twig-persist/，是个类似 Objectify 的持久层框架。 > 还有一个简易 GAE 框架：http://code.google.com/p/latke/ > > > > On Wed, Nov 24, 2010 at 8:00 PM, Tinker Pang <[email protected]> wrote: > > 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. > > 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. > > -- > My Blog:http://blog.csdn.net/DL88250 > -------------------------------------------------------- > Open Source, Open Mind, Open Sight, Open Future! -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. 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