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 performance as a cache
		After his last blog post about integrating db4o with Grails here's Steve Zara's follow up blog post about testing db4o performance . For this usecase db4o proved to be much faster than an ORM solution and also as fast a pure cache system with all the...

db4o Projects Spotlight

DataNucleus AccessPlatform 1.0 FINAL released

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 the DataNucleus site and is available for download.

Product News

Latest production build: 7.4.58.11547

here is a short info to resolve a race condition between our newsletter sendout and the very latest production build: We got …

Performance Contest Results

Two months ago we invited the db4o community to take part in the first db4o performance contest. Now the contest has been …

Wanted: TypeHandlers

You were playing with the idea to contribute to db4o? So far you did not find a nice, easy and short task to take on? Here is your …

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 …

Linq is here!

Hot of the presses! A new project just hit our main .net repository: Db4objects.Db4o.Linq . An optimizing linq provider for db4o. …

Recent Activity

Newsletter #45: db4o v7.4 Now Available for...

db4o 7.5 Development Release is available for immediate download ! Articles 7.4 Production Release Available db4o v7.4 is now a Production release and is available for download . Release notes are available here . Several fixes for dRS v7.4 are also included...

db4o performance as a cache

After his last blog post about integrating db4o with Grails here's Steve Zara's follow up blog post about testing db4o performance . For this usecase db4o proved to be much faster than an ORM solution and also as fast a pure cache system with all the...

db4Object公司简介：

db4objects 公司作为 BeijingOpenParty活动的主赞助商，一直默默支持着国内开源技术交流活动。除了每年一次邀请中国开发者参加 db4o开发者大会外，他们还定期在国内举行 db4o Opensource用户组活动。 http://www.beijing-open-party.org/index.php/2008/08/db4o-development-course.html...

Second Series of ODBMS User Reports Publish...

ODBMS.ORG, a vendor-independent non-profit group of high-profile software experts lead by Prof. Roberto Zicari, today announced the exclusive publication of a second series of new user reports on using technologies for storing and handling persistent...

Six Degrees of Separation Is Now Three

Interesting study by O2: http://www.o2.com/media/press_releases/latest_pr_14276.asp The study argues that the former thesis by US psychologist Stanley Milgram following a 1967 experiment has to be updated. Milgram found that, on average, people needed...