Andrej Koelewijn

I did a small proof of concept yesterday: a wicket web application using embedded Mule to connect to some services. Problem is that it had to run on OC4J 10.1.3.4.0 with Java 5. Got it running pretty fast, some tips:

Oracle’s xml parser didn’t like some of Mule’s xsd files. You can solve this by [...]

Yesterday Oracle released Oracle Fusion Middleware 11g, a SOA stack including WebLogic, BPEL, Rules, Metadata support, Oracle ADF, and improved declarative programming support in the new release of JDeveloper. If you google it, you’ll find plenty of blogs describing all the details of this new release.
One thing that surprised me is that Oracle now also [...]

Oracle is probably the biggest user of the java applet technology. Oracle Forms runs as an Applet in the browser. Now, Oracle Forms isn’t the hippest tool ever, people have been expecting it to die for a couple of years. But it’s still around. Mainly because Oracle still uses Forms in their Oracle E-Business Suite.
Recently, [...]

So Oracle just bought Sun. At first look it might seem like closed source versus open source. Most of Oracle’s well known products are closed source, whereas most of Sun’s products are open source. But that’s not the full story. Oracle is also involved in Open Source. It just takes a different approach.
There are a [...]

Interesting discussion on friendfeeds new database usage: How FriendFeed uses MySQL to store schema-less data. It’s basically a key-value database implemented on top of mysql, to get around schema-change and index performance problems in mysql.
There is a lot of activity around non-RDBMS databases recently. Although it’s always interesting to see new development and innovation, [...]

I’ve been using sql for a number of years now, and thought i knew most of the sql syntax. So i was quite surprised to find out about the existence of UPDATE … FROM. Turns out, this doesn’t exist in Oracle, but is supported by PostgreSQL.
Here’s a small example:

update response
set    house_id = ?
from   house [...]

Sometimes it seems like programmers will do everything to avoid SQL. At the same time DSLs (Domain Specific Languages) are very popular. If DSLs are so great, why are you trying to avoid SQL? Or procedural extensions to SQL? SQL is a DSL for dealing with relational data.
SQL was invented to deal with relational data, [...]