I had gotten my application to save data, but my queries are returning nothing. I see my data in both the parent and the child. I am getting a "java.lang.IndexOutOfBoundsException: Index: 0, Size: 0" error when I try to iterate through the child data. One of the strangest thing is that my primary Key value in the child table has a value of 1 for all the entities. This Key value should have been auto-generated by BigTable. Additionally, when I try to edit child I see something of the sort "Decoded entity key: ParentDB: id=6 > ChildDB: id=1" at the top of the page. Is this data at the top of the page telling me that I can retrieve both parent and child?
On Jan 20, 4:50 pm, "Ikai L (Google)" <ika...@google.com> wrote: > There should be plenty of examples around, but here is one from Max Ross's > blog: > > http://gae-java-persistence.blogspot.com/2009/10/creating-bidrectiona... > > We're looking at expanding the capabilities of the App Engine Cookbook to > support examples like this contributed by the community. > > > > On Tue, Jan 19, 2010 at 4:48 PM, Dave <ladjo...@gmail.com> wrote: > > I have been working assiduously on a GWT project. I have implemented > > the stockwatcher app without problems. It's new to me to be working > > with JDO/JPA. I'm more in tuned to using relational DB. There are no > > concrete application example that deals with one to many DB. I have > > read some of the documentation to create and use a one to many DB. I > > have been able to save the one to many data, but I'm unable to > > retrieve the data. I don't fully understand it all. Google should > > recognize that many people learn by doing. There needs to be a sample > > application with one to many relationships (and many to many). > > > If Google's only tutorial on GWT was like what is shown here > >http://code.google.com/appengine/docs/java/datastore/relationships.html. > > Then less people would have used it. I know I'll learn how to > > implement one to many properly by 'googling' the Internet. However, it > > could have been less painful! Please post a sample application > > > -- > > 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 > > google-appengine-j...@googlegroups.com. > > To unsubscribe from this group, send email to > > google-appengine-java+unsubscr...@googlegroups.com<google-appengine-java%2bunsubscr...@googlegroups.com> > > . > > For more options, visit this group at > >http://groups.google.com/group/google-appengine-java?hl=en. > > -- > Ikai Lan > Developer Programs Engineer, Google App Engine
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