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Data Retrieval With Single Line of Code


db4objects' activation scheme designed for devices

By P. J. Connolly
November 14, 2007 — 
Although object databases have been around for what seems like forever, the rise of the mobile device may prove to be the technology’s salvation. At least, that’s how one company sees it.

Open source object database specialist db4objects announced yesterday the beta release of version 7.0 of db4o, which introduces the Transparent Activation feature, a way for developers to retrieve complex data objects with a single line of code. This development release enables Transparent Activation for db4o and Java object collections, with plans to release a .NET version in December and have support for all collection types in early 2008, when a production release is scheduled to emerge.

The new release minimizes memory use by automatically detecting the activation depth of a collection of objects, or object graph, and loading only the necessary data. Although it’s been possible for developers to manually specify the activation depth of the objects they’re using, this is time-consuming.

The company claims that its scheme implements a “freespace” management system, designed specifically for cases where devices are repeatedly powered off without an orderly shutdown process, such as mobile phones and other handheld devices.

The company’s also lit up about its new premium service, which it launched the same day. The db4o Developer Network (dDN) Enterprise service is aimed at filling the requirements of cutting-edge Java and .NET projects while providing expert support for the company’s technology.

At the heart of dDN Enterprise is XtremeConnect, which puts developers together with a db4o expert. This remote pairing allows debugging, joint design reviews and other tasks to take place in a virtual setting that the company calls unique. The service also includes access to ObjectManager Enterprise, db4o’s new design tool aimed at corporate customers.

Company CEO Christof Wittig explained that the model for open source success calls for a services component, saying, “Red Hat and MySQL have pioneered commercial open source business models, where commercial tools and services boost their customers’ productivity and shorten time to market. db4objects takes it to the next level” by pairing up developers and experts via the XtremeConnect service.

The dDN Enterprise service runs US$18,000 per named developer, annually; it includes credit for 40 hours of expert pairing, and an in-process redistribution license for 500 runtimes.

Object Manager Enterprise is the company’s first commercial-only offering, and is available standalone or as a plug-in for Eclipse or Visual Studio. The GPL-licensed Object Manager 6 will continue to be available and be maintained by the db4o community.


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