db4o Developer Community

Announcing the release of DataNucleus AccessPlatform version 1.0.0 (final), providing Java persistence to a large range of datastores including db4o using JDO or JPA APIs.Limited free support is provided by way of an online forum, while commercial support is also available for those requiring something more reliable.Documentation is provided on ...

DataNucleus Access Platform is a standards-compliant Java persistence product supporting db4o. It is fully compliant with the JDO1, JDO2, JDO2.1, and JPA1 Java standards. It also complies with the OGC Simple Feature Specification for persistence of geospatial Java types. It allows access to all popular RDBMSs available today, together with db4o, ...

This was a virtual panel organized by the editors of InfoQ.com (Floyd Marinescu) and ODBMS.org (Roberto V. Zicari). They asked a group of leading persistence solution architects their views on the current state of the union in persistence in the Java community. Our Chief Architect, Carl rosenberger was part of the panel. Full ...

This tutorial shows us the overall process for adding db4o persistence to a simple application using JPOX. The basic steps are: Step 1 : Design your domain/model classes as you would do normally Step 2 : Define their persistence definition using Meta-Data. Step 3 : Compile your classes, and instrument them (using the JPOX enhancer). ...

Db4o no tiene ninguna referencia que use JDO, entonces no soporta JDOQL. A parte, Db4o es .Net/Java, JDO solamente existe en el mundo de Java. Quizás sería buen momento para comenzar a pensar en un Db4o.Contrib. Saludos 

Java Persistent Objects (JPOX) is a fully-compliant Open Source implementation of the JDO1,JDO2,JDO2.1 and JPA1 specifications for transparent persistence of Java objects. It is Apache 2 licensed and usable with any JDK 1.3 or above. The aim of JPOX from the outset has been to provide the most standards compliant Java persistence engine around. ...

Learn about how to use db4o with JPOX (a free and fully compliant implementation of the JDO1, JDO2 specifications). Queries can be expresed using either JDOQL, SQL, or JPQL. Marcel Wirth is actively working on JDOQL support for db4o. http://www.jpox.org/docs/1_2/developer/db4o.html db4o thanks the JPOX team and Marcel Wirth for their ...

JPOX ''DB4O'' plugin version 1.2.0-beta-5 is now released.This provides persistence to DB4O datastores using either the JDO1.0/2.0/2.1 API or the JPA1.0 API. Changes in this release include :- Querying using JDOQL - initial release, supporting the majority of available JDOQL features Bug fixes for transaction handling, and application ...

Recently I have been frequently asked to write up my criticisms about JDO again. The task was already very close to the top of my //TODO: list. Once again a bug simply disappeared with a nice refactoring: JDO was voted out of existence. I was only halfway correct with my forecast more than 3 years ago: ''Why Sun's Java Data Objects (JDO) will ...