About delete


Chapter 1 - Quick Tour

Quick tour on how to use Java and JPA with the ObjectDB Object Database.... basic CRUD operations (Create/Store, Retrieve, Update and Delete) on ObjectDB databases. The example program that this chapter ...



Delete action to apply to the foreign key for the key.(Annotation Element of javax.jdo.annotations.Key)



Delete action to apply to any foreign key for the value.(Annotation Element of javax.jdo.annotations.Value)



Delete action to apply to any foreign key for the element.(Annotation Element of javax.jdo.annotations.Element)



Invoked whenever a persistent instance is deleted, for example during javax.jdo.PersistenceManager.deletePersistent.(Method of javax.jdo.listener.DeleteLifecycleListener)


Null enums and IS (NOT) NULL: NullPointerException

Hello. I'm getting NullPointerException when adding %enum field% IS (NOT) NULL or == (!=) NULL in WHERE clause. The same exception using CriteriaQuery. ... edit delete Vladiator ... edit delete support ...


Database File Compression

ObjectDB database files are usually smaller than database files of other Database Management Systems (object and Relational) but still, an additional internal compression is possible. Usually smaller files are also faster because less I/O operations are required and memory cache can be used more efficiently. But compression and decompression consumes CPU time. Therefore, the effect of compression on Object databases is currently unknown.... edit delete support ...


RDBMS to ObjectDB migration section in documentation

Update documentation to include migration section from RDBMS to ObjectDB. It should describe preferred migration path, pitfals, potential issues and solutions. This is important for those who design JPA architectures and currently using major RDBMS platforms, but plans in the future to migrate to the ObjectDB. Thanks. ... edit delete nilozubd ...


@FetchGroup in JPA similar to JDO

I was checking what's new in different JPA implementation on the market and found quite interesting two features. First of those features is described in this ticket. It's similar to FetchGroup from JDO. It works like this. First you specify attributes to fetch from database: ... edit delete lwalkowski ...


Eclipse Browser

Request for an eclipse browser plugin. Ideally this plugin would allow read-only access to embedded databases.... edit delete dmoshal ...