Home » Author Archives: Lukas Eder (page 12)

Author Archives: 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.

Don’t Miss out on Awesome SQL Power with FIRST_VALUE(), LAST_VALUE(), LEAD(), and LAG()

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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’ awesomeness a couple of times, in particular about ROW_NUMBER(), RANK(), DENSE_RANK(). Today, we’re going to look into some awesome window functions that produce values of other rows that are ...

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Don’t Migrate to MariaDB just yet. MySQL is Back!

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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 2014, and I’ve met with Morgan Tocker, the MySQL community manager at Oracle to learn about where MySQL is heading. Who “is” MySQL An interesting learning ...

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Painless Access from Java to PL/SQL Procedures with jOOQ

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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 if the PL/SQL syntax and the tooling sometimes remind me of the good old times…           … I still believe that ...

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10 Things You Didn’t Know About Java

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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 chance, when Applets were still a thing? I bet that you didn’t know at least half of the following things. Let’s start this week with some great ...

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A RESTful JDBC HTTP Server built on top of jOOQ

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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 you to a very interesting approach at combining REST and RDBMS by Björn Harrtell. Björn Harrtell is a swedish programmer since childhood. He is usually busy writing GIS systems and integrations ...

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Let’s Stream a Map in Java 8 with jOOλ

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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 interface Map<K, V> { default Stream<Entry<K, V>> stream() { return entrySet().stream(); } } But there’s no such method. There are probably a ...

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Stop Claiming that you’re Using a Schemaless Database

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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 in the database can have varying sets of fields, with different types for each field.     And that’s true. But it doesn’t mean that there is no schema. There are in fact ...

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The dreaded DefaultAbstractHelperImpl

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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 like FactoryAdvisorAdapterHandlerLoader ContainerPreTranslatorInfoDisposable BeanFactoryDestinationResolver LocalPersistenceManagerFactoryBean Two of the above classes actually exist. Can you spot them? If no, play Spring API Bingo! Clearly, the Spring API suffers from having… ...

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Don’t Miss out on Writing Java 8 SQL One-Liners with jOOλ or jOOQ

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More and more people are catching up with the latest update to our platform by adopting functional programming also for their businesses. At Data Geekery, we’re using Java 8 for our jOOQ integration tests, as using the new Streams API with lambda expressions makes generating ad-hoc test data so much easier. However, we don’t feel that the JDK offers as ...

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