db4o: Queries in Java or Queries Without LINQ
Before I continue with client-server concurrency I explain how to run queries against a db4o database without LINQ. Most of the stuff in db4o works on every platform. The API…
Read moredb4o: Single Object-Container Concurrency
Today nearly every application has some concurrent parts. In a classic desktop-application some work is done in the background to keep the application responsive. In a web-application more than one…
Read moreFree IntelliJ-IDEA and YouTrack Pricing
IntelliJ IDEA, the best IDE in the world, is now available for free. Yeah \o/. How cool is that? Even better, it’s has a Apache 2 License. However lots of…
Read moreMaybe-Monad (Or The Better NullReference)
The Maybe-Monad sounds like some magic, but it’s something terrible simple. Its a computation which returns a result or ‘Nothing’. Often the a null-reference is used to represent ‘Nothing’. This…
Read moredb4o: Persistent Classes Tips
In the last four posts I’ve mostly talked about db4o itself and how to used it. All this is actually just the necessary evil for our goal, to persist our…
Read moreRx-Framework, Lombok & Music For Everyone
There’s a new talk/interview about the Rx-framework for reactive programming on channel 9. Yes, it’s the third time I link talks about the same topic here (here is the first…
Read moredb4o: Transactions
So I showed the basics, explained the activation-system and pointed out how db4o manages object-identities. So far so good, but I’ve never explain a very important feature of most databases, the…
Read moredb4o: Object-Identity and High-Level-Caching
In the last two posts (#1, #2) we never ever used anything like an id for any object. So how the hell does db4o identify objects? How does it ensure…
Read moreC vs Java, Doctor Who and Slow Club
Normally C- vs. Java-performance comparisons are wonderful and entertaining flame-wars. However this blog-post is very reasonable and each argument justified. I’ve stumbled by accident on a hand-cam-quality teaser of Doctor…
Read moredb4o: Activation- & Update-Depth
Activation is a very basic concept in db4o. In this post I’ll illustrate what it is, why it’s there and how you handle it. (All posts of this series: the…
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