Coincidental is a db4o concurrency and persistence wrapper for C# that provides concurrent-read/single-write access to objects for use in web-based game engines. It provides automatic transparent persistence without requiring post-build manipulation.

In a follow up to his DDD / CQRS series of blogs Elliot O'Hara shows us how he implements db4o repositories following the (you guessed it) Repository pattern. With just two simple interfaces and properly implemented classes Elliot shows us how to abstract db4o and make things really simple.

Check it out! Code included

Not long ago we announced UsefulDb4o, a community contributed open source base class library for developers working with db4o the .NET framework that consists of a few classes and features which can help you improve your work such as:

• migrating RDBMS to db4o Object Databases (include T4 Templates)
• using db4o in ASP.NET Web applications
• attributes, extensions methods, etc.

The author has created these videos to provide you with a walk-through:

Have you tried it? Let us know what you think about it so we can pass feedback to the author.

I wanted to share a video contributed by a community member Roberto Riquelme that shows how to set up the db4o Netbeans plugin. This plugin was kindly contributed by Gerd Klevesaat back in 2007 and is open source.

If you're interested and you feel like you could help updating it to work with the latest version of db4o and Netbeans please don't hesitate to contact me directly.

I just found this really nice blog post by Samy Arouje (author of iTraveller). He makes some good points about why he decided to go with db4o after evaluating several database technologies (even NoSQL's MongoDB). Let's take a look at some of his comments...

• Pre-Announcement: dRS Replication between db4o and Versant Object Database
• OSGi bundle upgraded to Java 5
• Robert Greene on "New and Old Data stores"
• Eric Falsken live on .Net Rocks! (NoSQL, db4o and more)

If you followed along the recent db4o development in our SVN you may already have been aware of it: For the past months we have put a lot of work into dRS replication between db4o and Versants flagship, the Versant Object Database (VOD). It is the goal of our first release to provide at least all the functionality that we already have in place for a while to replicate to RDBMS via Hibernate.

Today I am very happy to (pre) announce that all existing test cases are passing.

dVP Maik Jablonski just released Jease version 1.6. Jease is a Java-based Content-Management-System which is built on top of db4o as storage engine for its content types which can be extended dynamically directly through the CMS.

Jacqie just posted another great intro article about writing an app with db4o and ASP.NET MVC. It's a VisualStudio solution with a very simple model but it includes tests and a web app (ASP.NET MVC3). The project relies on db4o v8 for .NET 4.0 providing a Db4oSession that derives from ISession. Additionally it provides a SessionFactory that handles the database connections.

The blog post is available here (source code included!)

Our dVP Uwe Sander is currently working on Open Team Server (OTS), a .NET project (C#) which aims to provide an open source system for managing the whole lifecycle of a software project.

OTS is basically a source control system, but despite its name, it has nothing in common with the Team Foundation Server from Microsoft. Before checking it out you should note that the project is in a very early stage, it's not production ready and has no documentation except the command line help but it is basically working if you want to try it out.

Source code is here (no binaries yet):

http://sourceforge.net/projects/openteamserver/develop

We'll keep you posted on Uwe's progress. Stay tuned!