About Lukas Eder

Lukas is a Java and SQL enthusiast developer. He created the Data Geekery GmbH. 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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Use MySQL’s Strict Mode on all new Projects!

MySQL is a database that has been bending the SQL standard in ways that make it hard to move off MySQL. What may appear to be a clever technique for vendor lockin (or maybe just oversight ...
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Don’t Miss out on Awesome SQL Power with FIRST_VALUE(), LAST_VALUE(), LEAD(), and LAG()

If you’re using a commercial database or PostgreSQL / Firebird / CUBRID, you will be able to take advantage of the full power of window functions. We’ve blogged about window functions’ ...
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Don’t Migrate to MariaDB just yet. MySQL is Back!

Now that I have your attention, I’d like to invite you to a critical review of where we’re at in the MySQL vs. MariaDB debate. Around one month ago, I visited Oracle Open World ...
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Painless Access from Java to PL/SQL Procedures with jOOQ

PL/SQL is one of those things. Most people try to stay clear of it. Few people really love it. I just happen to suffer from stockholm syndrome, since I’m working a lot with banks. Even ...
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Have You Ever Wondered About the Difference Between NOT NULL and DEFAULT?

When writing DDL in SQL, you can specify a couple of constraints on columns, like NOT NULL or DEFAULT constraints. Some people might wonder, if the two constraints are actually redundant, ...
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10 Things You Didn’t Know About Java

So, you’ve been working with Java since the very beginning? Remember the days when it was called “Oak”, when OO was still a hot topic, when C++ folks thought that Java had no ...
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A RESTful JDBC HTTP Server built on top of jOOQ

The jOOQ ecosystem and community is continually growing. We’re personally always thrilled to see other Open Source projects built on top of jOOQ. Today, we’re very happy to introduce ...
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Let’s Stream a Map in Java 8 with jOOλ

I wanted to find an easy way to stream a Map in Java 8. Guess what? There isn’t! What I would’ve expected for convenience is the following method:                   public ...
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Stop Claiming that you’re Using a Schemaless Database

One of MongoDB’s arguments when evangelising MongoDB is the fact that MongoDB is a “schemaless” database: Why Schemaless? MongoDB is a JSON-style data store. The documents stored ...
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The dreaded DefaultAbstractHelperImpl

A while ago, we have published this fun game we like to call Spring API Bingo. It is a tribute and flattery to Spring’s immense creativeness when forming meaningful class names likeFactoryAdvisorAdapterHandlerLoader ContainerPreTranslatorInfoDisposable BeanFactoryDestinationResolver LocalPersistenceManagerFactoryBeanTwo ...
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