The FlushMode defines when new entities and your changes on existing ones get written to the database. This might seem like a simple and obvious mechanism. But I recognized in my Q&A calls that it often causes some confusion because, by default, Hibernate doesn’t perform a flush when you call the persist method on your EntityManager, or the save method on your…
Spring Data JPA’s repositories provide most of the database operations for you. That makes working with Spring Data JPA very comfortable but it also increases the importance of a good logging configuration. If you don’t implement your database operations yourself, you at least need to make sure that you know which operations get performed. The…
JPA and Hibernate provide a default mapping that maps each entity class to a database table with the same name. Each of its attributes gets mapped to a column with the same. But what if you want to change this default, e.g., because it doesn’t match your company’s naming conventions? You can, of course, specify…
Most domain models have a few technical attributes shared by most entity classes. Typical examples are the version attribute and the timestamp or user who performed the last update or persisted an entity. In these situations, many developers ask themselves what’s the best way to model these attributes. Oleg did the same recently in the…
Inheritance is one of the key concepts in Java, and most development teams prefer using it in their domain model. Unfortunately, relational table models don’t support the concept of inheritance. The JPA specification defines multiple mapping strategies to bridge the gap between the object-oriented and the relational world. I explained them in great detail in…
