db4o Developer Community

db4o open source object database, native to Java and .NET

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Welcome to the world's largest user community for object database technology!

Learn, contribute, and enjoy your exchange with more than 40,000 registered peers, who want to bring object oriented programming to the next level - the database - and leave the era of the object-relational mismatch, tedious O/R mappers and roll-your-own-databases behind them! Join the developer community now - it's fast, easy, and free.

In the Community

		db4o Most Valued Professionals 2...
		db4o is what it is thanks to the contribution of many individuals. We would like to recognize the effort of a group of people whose work has been particularly valuable to the project. We are very proud to announce the distinguished list of db4o most Valued...

db4o Projects Spotlight

	db4o-groovy: Groovy integration support for db4o
	This project provides utilities for groovy to access db4o databases. Features provided in V0.1: Db4oBuilder: a groovy based DSL for accessing a db4o database and Db4oGroovyShell and Db4oQueryGroovyShell: db4o aware extensions of the groovy shell. Url: http://code.google.com/p/db4o-groovy/ (thanks a lot Gerd!! =)

Product News

Synchronization issues in networking C/S fixed

We have fixed some thread synchronization issues in the C/S protocol and put new versions (rev. x.y.54.11278) for all branches …

Debugging TA Enhanced Code and the Observer Effect

Most of those who pair programmed with me know that I'm not very fond of debugging code by stepping through breakpoints inside an …

Performance Contest - for one more month

Do you like profiling? Do you like tuning code? If you do, how about taking part in the db4o performance contest? We offer USD …

Implications of instrumenting assemblies for Transparent Activation / Persistence in db4o - Part I

As the popular saying tell us, there's no such thing as free lunch. It is no different for work related subjects. When we …

New TypeHandler interface: Prerequisite for more extensibility and performance

One of the key advantages of db4o is that it simply stores any object with just one line of code: objectContainer.store(myObject); …

Recent Activity

[Kudos] Increase your productivity with db4...

"...if you want to really increase productivity you can use the db4objects object database if that is a good fit for your type of application (your object model is the database!) saving you a lot of db to object and back transformation code" Mike VanZant...

Newsletter #44: db4objects Announces Eclips...

Articles Object Manager Enterprise (OME) for Java and .NET Released Final Month for Performance Challenge with $6000 in Prizes db4o Welcomes our Most Valued Professionals (dVP) for 2009 Transparent Persistence and Transparent Activation in Practice OMG...

InfoWorld awards db4o with "Best of Open So...

"db4o began life as a Java database library, but its designers have since created parallel editions for the .Net languages. In 2005, db4o implemented Native Queries, which allow you to express queries as Java (or .Net) methods. Recent additions to the...

Synchronization issues in networking C/S fi...

We have fixed some thread synchronization issues in the C/S protocol and put new versions (rev. x.y.54.11278) for all branches online in the download center . Users with concurrent networking C/S in connection with lazy queries are recommended to upgrade....

db4o Most Valued Professionals 2009

db4o is what it is thanks to the contribution of many individuals. We would like to recognize the effort of a group of people whose work has been particularly valuable to the project. We are very proud to announce the distinguished list of db4o most Valued...