The JPA and Hibernate first-level cache

Introduction In this article, I’m going to explain how the JPA and Hibernate first-level mechanism works and how it can improve the performance of your data access layer. In JPA terminology, the first-level cache is called Persistence Context, and it’s represented by the EntityManager interface. In Hibernate, the first-level cache is represented by the Session interface, which extends the JPA EntityManager one.

MySQL JSON_TABLE – Map a JSON object to a relational database table

Introduction In this article, I’m going to explain how the MySQL JSON_TABLE function works, and how you can use it to transform a JSON object into a relational database table. When using a relational database system, it’s best to design the database schema according to the relational model. However, there are certain use cases when the relational model is too strict, and we are better off storing data in a JSON column type. For instance, as I explained in this article, when designing an audit log table, it’s much more convenient to… Read More

60 years of COBOL – past, present, and future

Introduction 60 years of COBOL, and, most likely, it’s here for the future. In this article, we have the pleasure of interviewing Adrian Tot about the past, present, and future of this technology that still has a very significant impact on our day-to-day business operations. As software developers, we dream of using the latest technologies to solve various business use cases. However, lots of software systems still run on COBOL, a 60-year old English-like data processing language inspired by Grace Hopper’s idea of having a programming language that’s machine-independent. Every now and… Read More

High-Performance Java Persistence Newsletter, Issue 19

Introduction Welcome to a new issue of the High-Performance Java Persistence Newsletter in which we share articles, videos, workshops, and StackOverflow answers that are very relevant to any developer who interacts with a database system using Java.

Hibernate Session doWork and doReturningWork methods

Introduction In this article, I’m going to explain how the Hibernate Session doWork and doReturningWork methods work, and when you should use them.