I am trying to learn JDO (and at the same time its GAE and Spring intricacies) by creating a small web app, and am having trouble getting updated domain objects to persist back to the database. I init
I recently added Text field to one of my Entities that cannot be null.I\'d like to set a default value for it, so that all of the Entities that I stored before I added the field will be populat开发者_
I am getting the following exception while trying to use transation in app engine datastore. javax.jdo.JDOUserException: Transaction is still active.
I\'m using Datanucleus (jdo) with derby and I have a class MyClass. And this class has a variable of the type AnotherClass. I want to persist this variable.开发者_如何学Go When an instance of MyClass
I have the following problem: I\'m using DataNucleus with JDO for my program. My jdoconfig.xml contains the following line:
I am currently struggling with whether or not I\'ve achieved a good level of separation, or if I\'ve missed the point somewhere, as I am relatively new to learning the disciplined side of development.
Using DataNucleus I have a problem seen in the second INFO statement below (2nd entry from the bottom).
I have two classes PaymentJDO and PaymentItemJDO. A payment can have several items. Any payment item is associated with an invoice.
I have two questions regarding how to create / use the JDO persistence manager (PM, hereafter). Say, in a Java web application, if I have 10 entities, which can be logically grouped into 2 groups (f
I have not added anything to my Database yet, thus the following query should return a result of 0 by my reckoning.
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