Home » Author Archives: Lukas Eder (page 7)

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.

This Common API Technique is Actually an Anti-Pattern

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I admit, we’ve been lured into using this technique as well. It’s just so convenient, as it allows for avoiding a seemingly unnecessary cast. It’s the following technique here: interface SomeWrapper { <T> T get(); } Now you can type safely assign anything from the wrapper to any type: SomeWrapper wrapper = ... // Obviously Object a = wrapper.get(); // ...

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Do Not Think That One Second is Fast for Query Execution

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I keep encountering situations where RDBMS users think that one second for query execution is anything near fast. Most recently, in this Stack Overflow question: Hibernate SQL In clause making CPU usage to 100% The poster’s original question was why a similar query executes in one second when executed in SQL Server Management Studio whereas the (seemingly) same query executes ...

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Let’s Review How to Insert Clob or Blob via JDBC

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LOBs are a PITA in all databases, as well as in JDBC. Handling them correctly takes a couple of lines of code, and you can be sure that you’ll get it wrong eventually. Because you have to think of a couple of things:                   Foremost, LOBs are heavy resources that need special ...

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Is Your Eclipse Running a Bit Slow? Just Use This Simple Trick!

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You wouldn’t believe it until you try it yourself. I’ve been using the Eclipse Mars developer milestones lately, and I’ve been having some issues with slow compilation. I always thought it was because of the m2e integration, which has never been famous for working perfectly. But then, it dawned upon me when I added a JPA persistence.xml file to run ...

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How JPA 2.1 has become the new EJB 2.0

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Beauty lies in the eye of the beholder. So does “ease”: Learn more about SQL Result Set Mappings and handle your native query results with ease: http://t.co/WH4BTlClIP #JPA #Java #JavaEE — Thorben Janssen (@thjanssen123) April 15, 2015 Thorben writes very good and useful articles about JPA, and he’s recently started an excellent series about JPA 2.1’s new features. Among which: ...

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How to FlatMap a JDBC ResultSet with Java 8?

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You’re not into the functional mood yet? Then the title might not resonate with you – but the article will! Trust me. Essentially, we want this: +------+------+------+ | col1 | col2 | col3 | +------+------+------+ | A | B | C | row 1 | D | E | F | row 2 | G | H | I | ...

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How to Use Java 8 Streams to Swiftly Replace Elements in a List

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Imagine you have a list of items: List<String> books = Arrays.asList( "The Holy Cow: The Bovine Testament", "True Hip Hop", "Truth and Existence", "The Big Book of Green Design" ); (Don’t judge me. Books from this random book generator) Now you’d like to create a new list where the third item only is replaced by some new value: List<String> books ...

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