If the Set is an attribute of another persisted entity, check the default prefetch group setting... so that when an entity is loaded, the collection which is an attribute is also loaded in the same request. Good luck! :)
On Jul 26, 1:56 pm, genjlc <jeremy.sh...@gmail.com> wrote: > Ok I think I was making the whole thing harder than it had to be. > Additionally, I did ALLOT of reading to try and find an example of how > to store and retrieve data from Google's Data store. There was some > stray code left over from one of those early attempts that was > detonating. Everything appears to be working, except that my query is > returning an empty set when it shouldn't ... Time to do a SELECT * > and see if the data is actually there. > > On Jul 25, 1:34 pm, Luis Daniel Mesa Velasquez > > > > <luisdanielm...@gmail.com> wrote: > > 1. Copy JARs > > 2. Create jdoconfig.xml > > 3. Obtain a PersistenceManager > > >http://code.google.com/appengine/docs/java/datastore/usingjdo.html > > > What do you exactly mean by "create the DB connection"? > > > Just obtain the persistence manager ...and persist. > > > On Jul 24, 5:06 pm, genjlc <jeremy.sh...@gmail.com> wrote: > > > > I am trying to connect to the datastore from within the confines of an > > > app. The app (client) is currently looping through an array of > > > strings, where every string is a URL to a pic. The client is > > > periodically bugging the server for some data that it then displays to > > > the user. This is all static and has no user > > > interaction.http://cd-jks-countdown-app-v2.appspot.com/ > > > > The ideal is to allow the user to search the DB by any number of > > > filters (first name, last name, event, ,,, ) So I am setting up the > > > client to capture the user's search parameters and pass them to the > > > server, I am trying to get the server to build a query and ask the DB > > > for the correct result set. The server would then pass the list of > > > strings to the client and the client would only loop through those > > > photos. This implies, however, that I can: > > > > 1. Connect to the DB. > > > 2, Pass the query to the DB and get a result set back > > > 3. That I can load data to the DB to be queried against. > > > > I think I have the "Add data" part correct: > > > PersistenceManager.persist(entity). > > > I think I have the entity correct. Basically a standard bean with > > > getter and setters for the instance variables, with the exception of > > > the primary kay (auto assigned Long), and a few annotation tags. > > > I think I have the query portion correct. Dynamically builds the > > > WHERE clause based on the parameters passed to it: if (firstName != > > > null) query.append(blah) > > > (There is lots of information, online, about what to do when you have > > > the connection) > > > > I haven't, however, figured out how to create the DB connection for > > > the server to use. > > > (There isn't any information about how to establish the connection, in > > > Java at least) > > > > This is supposed to be a learning app, its only my second GWT app, but > > > it is rapidly becoming an exercise in extreme frustration. > > > > On Jul 22, 2:34 pm, Christoffer Viken <christof...@viken.me> wrote: > > > > > are you trying to use it trough another platform? > > > > You can't connect to the datastore, you can only use it (from within a > > > > AppEngine app) as i understand it (and that makes sense) > > > > You could expose the datastore to your app (on 3p server) trough a REST > > > > API > > > > that you deploy to AppEngine (unless that breaks the TOS) > > > > > On Thu, Jul 22, 2010 at 10:28 PM, genjlc <jeremy.sh...@gmail.com> wrote: > > > > > I've made a simple Client/Server/Shared app that I would like to add > > > > > data to. I am trying to use Google's data store. > > > > > > I have been reading for two days and have yet to find a step by step > > > > > checklist/example of how to establish a connection to the cloud, in > > > > > Java, without resorting to PHP. There seems to be lots of information > > > > > on what to do once the connection is made, but no information on > > > > > actually establishing the connection > > > > > > -- > > > > > You received this message because you are subscribed to the Google > > > > > Groups > > > > > "Google App Engine" group. > > > > > To post to this group, send email to > > > > > google-appeng...@googlegroups.com. > > > > > To unsubscribe from this group, send email to > > > > > google-appengine+unsubscr...@googlegroups.com<google-appengine%2bunsubscrib...@googlegroups.com> > > > > > . > > > > > For more options, visit this group at > > > > >http://groups.google.com/group/google-appengine?hl=en.-Hidequotedtext - > > > > > - Show quoted text -- Hide quoted text - > > > - Show quoted text - -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
