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3 Reasons why It’s Okay to Stick with SQL
The past decade has been an extremely exciting one in all matters related to data. We have had: An ever increasing amount of data produced by social media (once called “Web 2.0”) An ever increasing...
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jOOQ vs. Hibernate: When to Choose Which
Hibernate has become a de-facto standard in the Java ecosystem, and after the fact, also an actual JavaEE standard implementation if standards matter to you, and if you put the JCP on the same level...
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Don’t be Fooled by Generics and Backwards-Compatibility. Use Generic Generic...
I’ve recently had a very interesting discussion with Sebastian Gruber from Ergon, a very early jOOQ customer, whom we’re in close touch with. Talking to Sebastian has lead our engineering team to the...
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How to Avoid the Dreaded Dead Lock when Pessimistic Locking – And some...
Sometimes you simply cannot avoid it: Pessimistic locking via SQL. In fact, it’s an awesome tool when you want to synchronise several applications on a shared, global lock. Some may think this is...
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How to FlatMap a JDBC ResultSet with Java 8?
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 |...
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It’s the Little Things: The PL/SQL NULL Statement, and why Every Language...
Syntax is one of those topics. One of those emotional topics that lead to very very very important discussions. I personally like PL/SQL. It is extremely verbose, and precise. It forces you to adhere...
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jOOQ Tuesdays: Vlad Mihalcea Gives Deep Insight into SQL and Hibernate
Welcome to the jOOQ Tuesdays series. In this series, we’ll publish an article on the third Tuesday every other month where we interview someone we find exciting in our industry from a jOOQ perspective....
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Let’s Review How to Insert Clob or Blob via JDBC
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...
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Do Not Think That One Second is Fast for Query Execution
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...
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How SQL GROUP BY Should Have Been Designed – Like Neo4j’s Implicit GROUP BY
In the recent past, we’ve explained the syntactic implications of the SQL GROUP BY clause. If you haven’t already, you should read our article “Do You Really Understand SQL’s GROUP BY and HAVING...
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PostgreSQL’s Best-Kept Secret, and how to Use it with jOOQ
PostgreSQL has a lot of secret data types. In recent times, PostgreSQL’s JSON and JSONB support was hyped as being the NoSQL on SQL secret (e.g. as advertised by ToroDB) that allows you to get the best...
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Use this Neat Window Function Trick to Calculate Time Differences in a Time...
Whenever you feel that itch… Can’t I calculate this with SQL? The answer is: Yes you can! And you should! Let’s see how… Calculating time differences between rows Let’s consider the following database...
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Type Safe Queries for JPA’s Native Query API
When you’re using JPA – sometimes – JPQL won’t do the trick and you’ll have to resort to native SQL. From the very beginning, ORMs like Hibernate kept an open “backdoor” for these cases and offered a...
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What Exactly are SQL Views?
You probably know about “ordinary views” already, but I’m sure you’ll find one or two things in this article that you haven’t thought about in this way yet… What exactly are SQL views? Views in SQL are...
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Implementing Client-Side Row-Level Security with jOOQ
Some time ago, we’ve promised to follow up on our Constraints on Views article with a sequel showing how to implement client-side row-level security with jOOQ. What is row-level security? Some...
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What’s Even Harder Than Dates and Timezones? Dates and Timezones in SQL / JDBC!
There was an interesting discussion recently on the jOOQ mailing list about jOOQ’s current lack of out-of-the-box support for TIMESTAMP WITH TIME ZONE data types. No one said that date, time and...
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NULL is Not The Billion Dollar Mistake. A Counter-Rant
A short while ago, I gave this answer on Quora. The question was “What is the significance of NULL in SQL?” and most of the existing answers went on about citing C.J. Date or Tony Hoare and unanimously...
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INTERSECT – the Underestimated Two-Way IN Predicate
Have you ever wondered how you could express a predicate that “feels” like the following, in SQL: WHERE Var1 OR Var2 IN (1, 2, 3) /u/CyBerg90 has, on reddit. The idea was to create a predicate that...
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RAM is the new SSD
Your data fits in RAM. Yes, it does. Don’t believe it? Visit the hilarious yourdatafitsinram.com website. But there is an entirely new dimension to this since last week’s announcement by Intel, which...
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Common SQL Clauses and Their Equivalents in Java 8 Streams
Functional programming allows for quasi-declarative programming in a general purpose language. By using powerful fluent APIs like Java 8’s Stream API, or jOOλ’s sequential Stream extension Seq or more...
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