About Lukas Eder
Lukas is a Java and SQL enthusiast developer working for Adobe Systems in Basel, Switzerland. He is the creator of jOOQ, a comprehensive SQL library for Java, and he is blogging mostly about these three topics: Java, SQL and jOOQ.
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Array, list, set, map, tuple, record literals in Java
Occasionally, when I’m thrilled by the power and expressiveness of JavaScript, I find myself missing one or two features in the Java world. Apart from lambda expressions / closures ...
The depths of Java: API leak exposed through covariance
Java can be very tricky some times, especially in API design. Let’s have a look at a very interesting showcase. jOOQ strongly separates API from implementation. All API is in the ...
The Visitor Pattern Re-visited
The visitor pattern is one of the most overrated and yet underestimated patterns in object-oriented design. Overrated, because it is often chosen too quickly (possibly by an architecture ...
SQL tooling, the ranking
When you need to get up and running quickly with your database, the tooling becomes very important. When developing jOOQ and adding integrations for new databases, I really love those ...
if – else coding style best practices
The following post is going to be an advanced curly-braces discussion with no right or wrong answer, just more “matter of taste”. It is about whether to put “else” (and other ...
Arcane magic with the SQL:2003 MERGE statement
Every now and then, we feel awkward about having to distinguish INSERT from UPDATE for any of the following reasons:We have to issue at least two statements We have to think about ...
Java 8 virtual extension methods
I’ve been following the evolution of the Java 8 Lambda expressions project for a while now, and I’m really thrilled by its current state of progress. The latest “easy-to-understand” ...
GROUP BY ROLLUP / CUBE
Every now and then, you come across a requirement that will bring you to your SQL limits. Many of us probably give up early and calculate stuff in Java / [or your language]. Instead, ...
Overload API methods with care
Overloading methods is a strong concept in API design, especially when your API is a fluent API or DSL (Domain Specific Language). This is the case for jOOQ, where you often want to ...
What are procedures and functions after all?
Many RDBMS support the concept of “routines”, usually calling them procedures and/or functions. These concepts have been around in programming languages for a while, also outside ...
