Book Image

Mastering Hibernate

By : Ramin Rad, Koushik Srinivas Kothagal
Book Image

Mastering Hibernate

By: Ramin Rad, Koushik Srinivas Kothagal

Overview of this book

Hibernate has been so successful since its inception that it even influenced the Java Enterprise Edition specification in that the Java Persistence API was dramatically changed to do it the Hibernate way. Hibernate is the tool that solves the complex problem of Object Relational Mapping. It can be used in both Java Enterprise applications as well as .Net applications. Additionally, it can be used for both SQL and NoSQL data stores. Some developers learn the basics of Hibernate and hit the ground quickly. But when demands go beyond the basics, they take a reactive approach instead of learning the fundamentals and core concepts. However, the secret to success for any good developer is knowing and understanding the tools at your disposal. It’s time to learn about your tool to use it better This book first explores the internals of Hibernate by discussing what occurs inside a Hibernate session and how Entities are managed. Then, we cover core topics such as mapping, querying, caching, and we demonstrate how to use a wide range of very useful annotations. Additionally, you will learn how to create event listeners or interceptors utilizing the improved architecture in the latest version of Hibernate.
Table of Contents (16 chapters)

Interceptors


Interceptors work similarly to events, they enable you to inject call back operations when interacting with the session. Creating and using interceptors is simpler than events. Furthermore, you can enable interceptors on a specific session, whereas events are registered globally and will apply to all sessions. But you can also enable an interceptor on a session factory, so it applies to all sessions.

Hibernate defines an interface called org.hibernate.Interceptor that you would need to implement. But, it also provides an empty implementation that you can extend so that you won't need to implement every method of the interface.

Most of the call back methods on Interceptor return a Boolean data type to indicate whether the method has changed the state of the entity (the state of the entity is the disassembled version of the entity properties).

When working with interceptors, you may modify the state of the entity. In that case, you shouldn't modify the entity object itself if it...