ByThorben JanssenHibernate is a very popular implementation of the Java Persistence API (JPA) standard. It acts as an additional layer on top of JDBC and enables you to implement a database-independent persistence layer. Hibernate provides an object-relational mapping implementation that maps your database records to Java objects and generates the required SQL statements to replicate all operations to the database. Let’s…
ByThorben JanssenJPA and Hibernate allow you to use DTOs and entities as projections in your JPQL and Criteria queries. When I talk about Hibernate performance in my online training or at a workshop, I get often asked, if it matters which projection you use. The answer is: YES! Choosing the right projection for your use case…
ByThorben JanssenAssociation mappings are one of the key features of JPA and Hibernate. They model the relationship between two database tables as attributes in your domain model. That allows you to easily navigate the associations in your domain model and JPQL or Criteria queries. JPA and Hibernate support the same associations as you know from your…
ByThorben JanssenJPQL is a powerful query language that allows you to define database queries based on your entity model. Its structure and syntax are very similar to SQL. But there is an important difference that I want to point out before I walk you through the different parts of a JPQL query. JPQL uses the entity…
ByThorben JanssenHibernate is by far the most popular JPA implementation. This popularity brings several advantages for all users. There are lots of blog posts about it, questions and answers on popular forums, and well-established best practices. In this post, I want to summarize some best practices for JPA and Hibernate which will help you to avoid…