DTOs are easy to use and the most efficient projection for read-only operations. So, whenever you don’t need to change the requested information, you should prefer a DTO projection. But what exactly is a DTO? How does such a projection work with Hibernate? And how can you use it in your queries? I will answer…
Hibernate Tips is a series of posts in which I describe a quick and easy solution for common Hibernate questions. If you have a question for a future Hibernate Tip, please post a comment below. Question: You showed in a previous tip how to handle null values in a JPQL ORDER BY clause. Can I…
Hibernate Tips is a series of posts in which I describe a quick and easy solution for common Hibernate questions. If you have a question for a future Hibernate Tip, please post a comment below. Question: I’m using a query with a JOIN FETCH clause to load parent entities with all their child entities. The JPQL…
JPA 2.1 introduced the annotation-based Named Entity Graphs and the Entity Graph API. They provide query-independent ways to define which entity attributes Hibernate shall fetch from the database. And while you can’t omit eagerly fetched associations or attributes with Hibernate, you can specify a query-specific eager loading for a graph of associations. Sounds great, doesn’t…
A solid understanding of JPA and its implementations is still one of the most in-demand skills among Java developers. So, it’s no surprise that there are several blog posts, books, and courses available that teach you how to implement a persistence layer using the JPA specification. I even recorded a JPA for Beginners course myself. But…
