Voldemort’s storage layer is completely mockable so development and unit testing can be done against a throw-away in-memory storage system without needing a real cluster or, as we will show next, even a real storage engine like db4o for simple testing.

Note: All db4o related files that are part of this project are publicly available on☞ GitHub

This is an article contributed by German Viscuso from db4objects (a division of Versant Corporation).

Read the full article here.

• What market is db4o (and related products) competing in? The database market? The object database market? A different one?
• What are the toughest challenges facing db4o in the market?

See the answers on VS Magazine's website

To see the full interview check this page

With db4o, the cost involved in saving an object is practically nothing. I retrieved 1,000 rows from a relational database, created objects to hold the rows' values, and stored the results in a db4o database. The time required to retrieve and store the objects was almost identical with the time required to just retrieve the rows. Retrieving the objects through db4o was the same as retrieving the original rows from the relational database. For a client-side database this is more than "good enough" performance.

See the full article here: http://visualstudiomagazine.com/articles/2010/07/22/db4objects-review.aspx

Here are the details for the event:

3rd International Conference on Objects and Databases
September 28-30, 2010
Frankfurt am Main, Germany

2 tutorials, 1 workshop, 10 research papers, 10 industry
presentations,  3 keynotes and 1 keynote panel...

(continues...)

The interface is pretty nice, let's hope they add more and more java libraries!

We hope it'll be now easier for you to actually find the information you're looking for. We're are working hard to improve the user experience on our websites and trying to minimize all the issues that a broad site migration normally causes. Our next challenge is to fix all the broken links pointing to our old forum system and we're already working on that (we already mapped the urls belonging to the blogs section so that should be working for you right now).

So, please head to developer.db4o.com and try the new search box! (and if you run into any issues please report back)

Once you use Peter's POM file all you have to do is:

config.add(new TransparentActivationSupport());

// configure db4o to use instrumenting classloader
config.reflectWith(new JdkReflector(Db4oHelper.class.getClassLoader()));
config.diagnostic().addListener(new DiagnosticListener() {

   @Override
   public void onDiagnostic(Diagnostic dgnstc) {
      System.out.println(dgnstc.toString());
   }
});

"db4o is a very fast well known object oriented database. So far, IntelliJ seems to support only Relational databases - but no Object oriented ones. There's an eclipse plug-in for db4o, so users will simply use Eclipse when their project is using db4o ."

Please vote so we can have a db4o plugin for IntelliJ IDEA !!

http://plugins.intellij.net/wishlist/item/?wid=352

Brief description is: "Create a Contact manager with 15 user definable fields, and a scroll list on the left made up from the indexed field. A contact manager. The app should run in the cloud using Java and DB4O objects as the database."

If you want to bid you can do it in this page.

(Read more here)

After finishing computer science studies at secondary school, Roman developed  web applications for two years. Later he decided to study computer science at University of Applied Sciences in Rapperswil where he's about to finish his bachelor thesis this year. He also worked part time on software for analysis of data from sensor networks.

In Roman's own words: "I'm delighted to contribute to db4o, because this ingenious product deserves an outstanding documentation."

Roman can be reached [script removed]here.

An embedded object-oriented database ‟db4o” delivers data to this system in near-real-time mode. After a series of performance tests the Arum software developers determined that db4o not only matched their requirements – it outperformed MySQL/Hibernate for every operation, even data warehousing.

You can get the full case study here.

The db4o team invites you to submit your db4o based application for tuning! We're working on a "Tuning and Performance Improvements" Guide and we're looking for real use cases to include in the document (so, if you decide to submit, you'll have to be ok with the fact that we're going to showcase parts of your source code publicly).

Submitted applications will be reviewed by our core team to determine if they qualify for the guide. If your app is selected the db4o team will work on improving its overall (db4o related) performance and share these improvements with you and the db4o community (submissions will be closed once the guide is released so don't miss this opportunity =)

What are you waiting for? Send us your app for consideration! (community@db4o.com)

Being a performance freak, Fabio has been writing a range of software that goes from SARS scanners, embedded systems and ERPs for Singaporeans companies and MMORPG object database servers, games and surveillance systems for Brazilian ones.

In Fabio's own words: "I'm very excited with the opportunity of contributing with this so endearing project. I think there is no other place where my experience would fit best."

Fabio can be reached here.

Being a performance freak, Fabio has been writing a range of software that goes from SARS scanners, embedded systems and ERPs for Singaporeans companies and MMORPG object database servers, games and surveillance systems for Brazilian ones.

In Fabio's own words: "I'm very excited with the opportunity of contributing with this so endearing project. I think there is no other place where my experience would fit best."

Fabio can be reached here.

http://flyingspaniel.blogspot.com/2009/11/using-zk-with-oodb-such-as-db4o.html

Overall Morgan shows how easily an object-database like db4o can be put in place.

Check the Q&A here. And if you like what you read please vote for it on DZone and/or kick it via DotNetKicks.

Check out the early registration fees which are valid until May 15 (you can save up to 45 USD in the main conference pass).

We hope to meet you there! =)

So, what do you think about the new look?

So, if you're a Gentoo user you can now pull the latest db4o version for JDK 1.1, 1.2 and 5 =D

Thank you Thomas and the entire Gentoo team!

Come and join us in the Powershell community!

Follow us here: http://twitter.com/db4objects

Source code is included (C#) and a brief explanation on how to inject the repository against the IoC framework Unity.

We look forward for Neil's follow up blog post!

Don't miss this opportunity to check JavaFX persistence with db4o (source code included). Although this is a basic example you might want to contribute more advanced examples based on this one to the thread.

Thanks Jos!

The agenda for this meeting will be as follows:

1300-1310 Welcome and introductory comments (Mike Card)
1310-1330 Review of scoping consensus thus far and db4o comments from last meeting (Mike Card) 
1330-1630 Discussion of scope areas to be included or excluded (all participants)
1630-1700 Wrap-up and discussion of next steps (Mike Card)

And I'm glad to see that Mike says "We got some excellent feedback from db4o at our last meeting on these topics and we would like input from other vendors as well."

Let's hope other vendors join this effort (IMHO it's worth it!)

And don't miss the latest entry: "Pythonic DB4O"

Thanks Jim!

Join Jim Cassidy in his effort to use db4o together with Jython. He suggests an an Active Record like wrapper around db4o.

Stay tuned to his blog for upcoming db4o samples implemented in Jython.

http://source.android.com/

And don't forget that db4o works like a charm on Android =)

Best.

The source code of the application is available for download. Have fun with YuiBook!

http://projects.db4o.com/YuiBook

We thank Peter Brightman for this contribution!!

For more information on retreiving db4o from the repository, see: http://springsource.com/repository/app/bundle/version/detail?name=com.springsource.com.db4o.java5&version=7.2.54.11278&searchType=bundlesBySymbolicName&searchQuery=db4o

Thanks Chris!

See http://stackoverflow.com/questions/tagged/db4o

In this specific thread:

http://stackoverflow.com/questions/21207/db4o-experiences

someone says the db4o forums are useless. Do you think that's the case? 

Thanks Goran for letting us know about this great resource.

It is now possible to checkout the db4o.net module, type make and all assemblies are compiled and working. Of the full set of db4o tests only 9 are failing out of 5127, 4 or them being x-platform related, leaving only 5 tests to fix for a perfect compliance.

Thanks JB! =)

For this usecase db4o proved to be much faster than an ORM solution and also as fast a pure cache system with all the advantages of using a database system (eg queries).

Way to go!

http://www.beijing-open-party.org/index.php/2008/08/db4o-development-course.html

Not only the Page is an excellent resource to keep up to date with db4o related activities, but also, as more fans interact with it, we'll see more opportunities to generate interesting social stories. A Facebook Page thus will help us generate awareness, connect with db4o followers and build relationships. Note that the page is interactive and it allows you to post your own db4o fan videos, photos, etc.

[ImageAttachment]

Best regards and thanks for your constant support.

• An OSGi 4 compliant container with Flex-based management console.
• A platform for deploying modular Flex applications as OSGi bundles.
• Rich server functionality using Blaze DS to expose OSGi services as remote objects.
• And db4o support =)

http://www.arum.co.uk/solstice.php

• The original JDOQL implementation has been superceded by a new "generic" implementation supporting more of the JDOQL syntax
• Support for querying via JPQL is added.

Thanks Gerd!

Main things of interest to db4o users in this release are:

• Added support for db4o "embedded server" mode (contrib from Joe Batt)
• Zip file of Access Platform specifically for db4o, including bundled db4o-6.1 (GPL)

Enjoy! (thanks Andy =)

I just wanted to point you to a recent contribution by Dario Quintana. The idea is to do an interception before save/update on an object letting a (user provided) generator set a value on a given field.

Download this example and learn how to implement your own generator here.

Thanks Dario!

This write-up also gives me a chance to learn about some cool new features of db4o 7.2 (currently development version) such as LINQ integration, transparent activation and transparent persistence. These are really big changes from the previous version I tried (6.3). Hope that I can find some time writing about all these features. But don’t wait for me though, just go ahead and try them yourself…

http://www.buunguyen.net/blog/object-oriented-database-programming-with-db4o-part-2.html
Buu Nguyen

http://wiki.restlet.org/docs_1.1/g1/43-restlet/52-restlet.html

microblog_sourcecode (application/x-zip, 2.3 MB, info)

Thanks a lot Dan!

Besides Tapestry, software tools you will come across in this book are "db4o", "Maven", "NetBeans IDE" and "Eclipse IDE".

The second appendix, "Creating a Real Data Source with db4o", introduces db4o and gives a nice insight into enhancing the mock Web Application by doing away with the Java class way of storing and retrieving data.

http://amitksaha.blogspot.com/2008/02/tapestry-5-building-web-applications.html

http://www.jpox.org/docs/1_2/developer/db4o.html

db4o thanks the JPOX team and Marcel Wirth for their continuous support!

You can find more information about JPOX here: http://www.jpox.org/

http://edwinstrek.blogspot.com/2008/01/6-reasons-for-not-using-db4o.html

Check Edwin's last point: Why don't you tell a friend or coworker about db4o? =)

Enjoy (thx Edwin)!

Check it out here

• Pluggable sockets for db4o: this reference documentation topic shows you how to hook your own socket implementation for db4o C/S communications. This is pretty useful for plugging SLL sockets and have a secure C/S channel (examples and source code included)
• Import external data to db4o: is a code snippet by Edwin Sanchez which shows you how to extract data from a stream (e.g. a text file) and dump it to db4o

Enjoy!

http://www.ohloh.net/projects/3429/contributors?page=1

We would like to thank all db4o committers (past and present employees, community members and collaborators) for making db4o possible!

Would you like to be on the list? Let us know. You can start by familiarizing with db4o source code and the changelog:

http://source.db4o.com/browse/db4o
http://source.db4o.com/changelog/db4o/

Best regards!

• db4o "In-Process" (.NET)
• db4o C/S (.NET)
• dRS (db4o replication system)
• Windows Mobile 6
• Pocket Outlook

The use case is over-the-air Pocket Outlok Contact synchronization on a Windows Mobile 6 device with a db4o server using db4o synchronization technology (dRS).

You can check the sample here

http://www.youtube.com/db4o

We will be including new videos (such as sample application tutorials) soon! However, we encourage the submission of community contributed videos (please show us how you use db4o). If you want to share your db4o related video send a private message to our community manager.

(Stay tuned by subscribing to the space in our YouTube page).

ODBMS.ORG, a vendor-independent non-profit group of high-profile software experts lead by Prof. Roberto Zicari, today announced that it has expanded their offerings to provide more casual and frequent as well as opinionated news posts by launching the "The ODBMS Industry Watch" blog:

http://www.odbms.org/blog/

http://www.odbms.org/about_news_20070906.html

(Check the cool "10+1 Questions On Innovation" series!)

• Configuration and Tuning
• Distribution and Replication
• Schema Evolution: Refactoring
• Inheritance Evolution
• Callbacks and Translators

The presentation is good quality and comprehensive. You can download it here

• Coordinate
• Point (MultiPoint)
• LineString (MultiLineString)
• Polygon (MultiPolygon)

If you want to learn more see the db4o2D project space. On the Trac server you can find the actual milestones, the "State of the Art" Document, which contains an abstract of project. The phase plan and project plan are also linked but are written in German.

(Note that the project is running and that documents can change over the duration of the project)

As you might already know you can embed db4o's super-light database engine into your OSGi application and store any object structure easily (http://www.db4o.com/OSGi/). db4o's simplicity becomes a perfect fit for transparently leveraging a fast and robust persistence service from within the OSGi platform.

As a special guest to the workshop Mr. Takenori Sato (JAPAN) will conduct a dissertation about "DB4O in OSGi" starting at 13:30

More information here.

You can download this sample (named "TA Sample") in our section for starter kits and samples.

gaikokugo (by Christopher Brind) is an Eclipse RCP application that uses db4o for it's underlying database in order to aid language students by forcing them to enter their class notes in to an application and then receive automatically generated pop-tests.

Check it out in our project section!

Here is a list of kind blog posts published by dVPs after the nomination:

Thomas Jaeger
http://thomasjaeger.wordpress.com/2007/08/15/dvp-2008-award/

Buu Nguyen
http://www.buunguyen.net/blog/i-am-a-dvp.html

Dario Quintana
http://blog.darioquintana.com.ar/2007/08/16/dvp-2008-at-db4o/

Kazunori Satou
http://d.hatena.ne.jp/Kazzz/20070909/p1

Victor Munzenmayer
http://vmunzenmayer.blogspot.com/2007/08/dear-victor-let-me-be-first-to.html

Thank you Gerd (we're eager to try this plug in!)

The project owner is Bernd Steindorff and you can access it here.

Community member Guido Ludwig registered jtrade in our ProjectSpace wiki.