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 60,000 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

		New db4o demo for ADO.NET Data S...
		The purpose of this demo is tho show you how the .NET version of db4o can fully act as a datasource via the ADO.NET Data Services framework. This is achieved by using db4o's LINQ provider while supporting the interfaces IQueryable and IUpdatable required...

db4o Projects Spotlight

	Standalone Object Manager via Eclipse RCP
	Project domr by Jin Mingjian aims to provide an RCP version of db4o OMJ (Object Manager for Java). It will be a lightweight, standalone db4o object management tool. You can download a functional preview here!

Product News

LINQ improvements.

Hi, I want to let you know that during the last few days we have made some enhancements and fixed some bugs / issues related to …

Give your objects a REST (interface)

ADO.NET Data Services Framework [1], codename Astoria, a framework released with the Service Pack 1 of the .Net framework 3.5 …

db4o goes Queryable

The LINQ framework design guidelines [1] describes the "... three means by which a type can be designed to participate in LINQ …

In the search of silver

Hi! If you develop for .Net (and even if you don't :) the odds are high that you've already heard about Microsoft Silverlight, a …

New db4o library structure in db4o 7.7

The db4o core engine used to get built to one big fat .jar/.dll. From our users on low resource devices we constantly hear …

Recent Activity

[Kudos] db4o: pain free development

"Versant have come up with an easy to use object-database . Next to using relational databases, development is pain-free" http://we-fearless-ones.blogspot.com/2009/06/db4o-object-database.html...

[Kudos] I hope db4o gains more and more tra...

"db4o is an object database which means there is no mapping files, attributes or other ‘impedance mismatch’ between your c# classes and the ‘database’ itself. It’s mostly used in embedded scenarios but appears to be getting used in websites. I’ve only...

Newsletter #52: db4o enhances its support f...

db4o now fully supports ADO.NET Data Services (aka Astoria) New IQueryable and IUpdatable support for db4o .NET Check out our latest LINQ enhancements Silverlight version of db4o update db4o for .NET Quick Reference Card by DZone now available db4o 7.10...

LINQ improvements.

Hi, I want to let you know that during the last few days we have made some enhancements and fixed some bugs / issues related to our LINQ implementation. Some of them were just annoyances that forced developers to use "not so idiomatic" styles as workarounds,...

New db4o demo for ADO.NET Data Services (ak...

The purpose of this demo is tho show you how the .NET version of db4o can fully act as a datasource via the ADO.NET Data Services framework. This is achieved by using db4o's LINQ provider while supporting the interfaces IQueryable and IUpdatable required...