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Databases

It's not a big secret that a lot of people hate BugParade. It was great 10 years ago, but it's still stuck there, with complete lack of transparency, arcane voting and comment system and quite a few other problems. There are quite a few alternatives out there, and hopefully now that the open-sourcing effort is mostly behind Sun, perhaps some of the manpower will be put into retiring BugParade and...
on May 18, 2007
Check out Francois Orsini's "Enabling Offline Web Applications with Java DB," where he previews his upcoming JavaOne talk with Zimbra's Kevin Henrikson. Previously posted: If you're interested in playing soccer just after the closure of JavaOne 2007, see here.
on May 4, 2007
I'm always excited when I can get in on the fun those EE guys seem to have all the time. My latest exploration into the EE spec has helped me find another little treasure that I can bring back to the desktop: the Java Persistence API (JPA). I've been tinkering, tossing in a JPA annotation here and there, discovering how to use the JPA in my desktop applications. I'm convinced that it's not so...
on Apr 25, 2007
Java DB (or Derby, or Cloudscape if you prefer) 10.2 beta is available for download at http://people.apache.org/~rhillegas/10.2.1.0-beta/. There has not been a feature release since august 2005, so this should be what Java DB/Derby users are waiting for. New features include: Scrollable Updatable Result Sets JDBC4 Grant/Revoke Online Backup Stronger Network Authentication More information at...
on Aug 12, 2006
Pure fiction or reality? well, this is one of the two and yes it has become a reality! - It is a very exciting event indeed to have an Open Source Java Database System bundled into Sun's *latest* 1.6 JDK (Mustang build 88 to be more precised), and at no cost. Java DB is based on Apache Derby and is Sun's redistribution of this last one. It is a fully transactional, Java technology-based...
on Jun 15, 2006
This demo showcases Java DB (based on Apache Derby) running embedded within a web browser. At the present time, this demo runs on Mozilla Firefox and Mozilla Navigator web browsers - The HTML and javascript would have to be modified in order to run on other web browsers such as Microsoft Internet Explorer. This Web application demonstrates how an embedded database can be used to persist data from...
on Apr 29, 2006
In his keynote address to the ApacheCon yesterday, Tim Bray announced that Sun will be releasing the Apache Derby database as "Java DB". This announcement comes after months of planing, hard work, team building and contributions to the Apache Derby project. All of Sun's database technologies group should really be congratulated for their contributions and effort! I'm honored and truly proud to...
on Dec 14, 2005
Today at ApacheCon in San Diego, Sun's Tim Bray said that Apache Derby will be distributed by Sun as the open Java DB. Java DB (or Derby) will appear in several Sun products and NetBeans IDE 5.0 will have a Derby (or Java DB) plugin. So, now we're going to have IBM's Cloudscape vs. Sun's Java DB vs. Apache Derby. Confusing? Chaotic? Not really. The three are really the same piece of software....
on Dec 13, 2005
I mentioned the lightweight OODB db4o in some earlier blog entries and I admit that I really like that piece of software. For that, I like to guide your attention to another blog, giving a nice overview about the various approaches for queries, esp. the native queries introduced with db4o V5.0. I feel it is worth reading.
on Dec 11, 2005
Apache Derby, the pure Java SQL database, has released version 10.1.2.1. The changes since official release 10.1.1.0 include: Globalization of the 10.1 error messages. Eclipse 3.1 support Ability to run on Mac OS X with no special configuration Support for direct execution of derbynet.jar using the -jar option of the VM Fixes to allow databases to be loaded from jars in the classpath Fixes...
on Nov 24, 2005
In response to my A Read-only database in a jar? one of the commenters remarked that "Derby is alright but is much slower than HSQL" and referred to a benchmark at http://jamie.ideasasylum.com/notebook/index.php?id=4. And guess what? He's is right. The problem is to figure out how he's right. I had one of our performance engineers look at the benchmark source and he came back telling me that...
on Oct 14, 2005
In Norway, all wines and liquors and beers stronger than 4.75 volume percent are sold at Vinmonopolet a state monopoly (Literally "The Wine Monopoly"). What has this to do with a read only database? Well, I once had an application on my Palm which contained Vinmonopolet's complete catalogue. Every now and then I updated the catalogue and was the able to search for information about their...
on Oct 3, 2005
I received some interesting comments on Easy String Concatenation Considered Harmful? and want to comment some of them. I too love the easy string concatenation of Java. But ease of use and the readable code that comes from it will very often hinder the programmer from seeing the problem when it occurs. I also agree that performance optimization should not be a developers first concern. But my...
on Sep 28, 2005
This is not about the amount of String objects generated when you do string concatenation in Java. This is about databases and JDBC. Performance problem? When encountering performance problems programmers have with Derby and other databases I very often find application code like Statement s = c.createStatement();while (<some loop on j>) {   ....   ResultSet rs = s....
on Sep 20, 2005
I found this article on integrating Derby with Tomcat. It shows three integration scenarios: The prototype integration Derby is used only by a single web application, but each HTTP request actually causes an attempt to load the Derby system (in embedded mode) into memory. A new connection is created for each request. There is no proper shutdown of neither single databases nor the Derby system....
on Sep 20, 2005
i've been meaning to write about my impressions/experiences with hibernate for a while now. for some reason i've been putting it off..until now. i've been using hibernate for maybe a little over year. i'm still using the latest 2.x implementation (i haven't yet had/taken the time to migrate to v3.x). in reflecting about hibernate over this period of time, a number of its characteristics have...
on May 5, 2005
Since I've been investigating on persistence recently, I found that performance might be an issue, esp. when thinking about embedded databases. So I organized a race (very obviously inspired by db4o's Formula1 tutorial) and put the results online in form of the SourceForge project PolePosition Currently I lined up these database systems for some training laps: jdbc MySQL Apache Derby (...
on Mar 30, 2005
These days I'm fooling around with some database technologies. Just one thing came to my mind when I was observing my own daily work. Do I query federate databases often? No, I don't. Instead I use google. That's my standard query tool and it is really powerful. Everybody does. Nobody can live without any more. Today, federate databases are the backbone of most applications. They maintain...
on Mar 4, 2005
There has been an announcement recently that the db4o database has gone opensource. Db4o? Heard about it, visited the website years ago, remember it looked nice.... The download is small, even smaller is the jar: 320kb - nothing more is needed. Checking it out reveals really cool features. All kinds of persistence I've seen so far needed some kind of prerequisites to be taken: special base...
on Feb 14, 2005
The following walks you through how to get the Blue Prints application, Adventure Builder to work with the MySQL database. For more information, check out the Adventure Builder Java.net Community JavaTM Adventure Builder Reference Application - Version 1.0.1 Using MySQL This document assumes that you have downloaded and installed the J2EE 1.4 Platform Edition. Download the J2EE 1.4 Platform...
on Aug 6, 2004