Introduction I’m now reading the wonderful SQL Antipatterns book by Bill Karwin. The book is a great reference for any developer that needs to interact with a Relational Database System. In this book, the Entity-Attribute-Value (EAV) model is portrayed as an Anti-Pattern. Although I must admit that a proper relational schema is almost always the best approach when designing an enterprise system, there are use cases when the EAV model is justified. In this post, I’m going to explain when to use EAV and how to transpose a ResultSet so that rows… Read More
Introduction Exactly one year ago, I bought Designing Data-Intensive Applications by Martin Kleppmann. However, since I was busy writing High-Performance Java Persistence, it took me over a year to find the time to read Martin Kleppmann’s book. This post is a review of what this book is all about and why you should be interested in reading it. Audience If you are a backend developer, a team leader or a software architect, this book must be on your reading list. While a junior developer might find the book interesting too, you got… Read More
Introduction While reviewing this Hibernate Pull Request, I stumbled on the HHH-10746 Jira issue. After doing some research, I realized that this issue was reported multiple times in the past 10 years: HHH-1810 HHH-4959 HHH-11246 In this post, I’m going to explain why this issue was causing performance issues, and how it got fixed.
Introduction As I explained in this previous article, you can map calculated properties using Hibernate @Formula, and the value is generated at query time. In this post, you’ll see how you can use a custom SQL fragment to customize the JOIN relationship between two entities, or an entity and a collection of embeddable types.
Introduction Exactly one year ago today, I started working as a Developer Advocate for the Hibernate team at Red Hat. Prior to joining Red Hat, I used to work as a software architect, and I didn’t have any clue what I would have to do as a Developer Advocate. So, I learned on the way. This post is a summary of what this role is about, and what I’ve managed to accomplish.