jdo

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Google app engine JDO data store design using inheritance

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.[详细]

2023-02-14 03:26 分类：问答
Owned relationships in Google App Engine not working

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[详细]

2023-02-14 02:58 分类：问答
In JDO (AppEngine), after persisting an object, how can i get the key of that particular object?

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:[详细]

2023-02-13 14:04 分类：问答
Reading a persistent object's variable prevents it from being added to an object later

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[详细]

2023-02-13 02:52 分类：问答
JDO PersistenceManager: how can I tell that an object returned by getObjectById has been deleted?

In my app I have a certain control flow that goes like this: DAO object = persistenceManager.getObjectById(DAO.class, id);[详细]

2023-02-12 13:37 分类：问答
JDOQL (Appengine) - Query for all/one items with a list as parameter?

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 ([详细]

2023-02-12 04:50 分类：问答
GWT + JDO + GAE, how to arrange my data for performance

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.[详细]

2023-02-10 12:00 分类：问答
Updating child objects in Google App Engine using DataNucleus JDO

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[详细]

2023-02-10 10:25 分类：问答
How to do a Date range query using JDO on Google App Engine

Here is the code snippet I am trying to get to work: final Query query = pm.newQuery(\"SELECT FROM model.Strip WHERE publishOn <= startDate[详细]

2023-02-09 10:15 分类：问答
Container Managed Transaction with JDO/DataNucleus

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).[详细]

2023-02-08 15:04 分类：问答