I am using subtable inheritance strategy to design my data store using JDO for my application hosted in google app engine. There are three types of users tha开发者_JAVA技巧t can logs into my app.
I\'m working on a Google App Engine project and I\'m struggling to get relationships in JDO working properly. The objects get saved correctly however the related objects don\'t show up in the datastor
When I persist an object to the datastore, when (and how) can I get the key of that particular object that I just persisted? So for example, if I have:
I am trying to make a new object Session and persist it to the database. It has a persistent variable of object User. I query the DB for the user I want to add to the session. If the user\'s password
In my app I have a certain control flow that goes like this: DAO object = persistenceManager.getObjectById(DAO.class, id);
I\'m trying to create a query so that all items of a given list (parameter) are contained in a a table\'s column (which is also a list). I also need a query so that at least one item of a given list (
Here is my structure that I wish to store in the database GrandFather->Father[]->Child[].Grandfather contains a list of father and father contains a list of Children.
I have spent several hours trying to work this one out and I just can\'t seem to get my child entities to update despite trying several suggestions.I have looked at the GAE documents extensively and I
Here is the code snippet I am trying to get to work: final Query query = pm.newQuery(\"SELECT FROM model.Strip WHERE publishOn <= startDate
Goodmorning all, I\'m currently playing with Datanucleus/JDO. One thing that I like is the Type safe query system, and I want to use Datanucleus in future projects (I come from Hibernate background).
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