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)

Cascade operations


You may already be familiar with cascade delete and update in a relational database. In the ORM world, this notion is a little more complicated. Hibernate treats this as a transitive property that may or may not propagate to the associated entities, depending on the state of the objects (transient, detached, or persistent) as well as the cascade settings that you choose when you define your association.

Hibernate doesn't automatically propagate the persistence operations to the associated entities. However, you can control this behavior using the cascade attribute of an association.

JPA defines certain cascade types: ALL, DETACH, MERGE, PERSIST, REFRESH, and REMOVE. These correspond directly with the operations provided by the EntityManager interface.

The Hibernate Session interface provides additional operations, such as save, update, or replicate (some names are different in Hibernate and JPA but the underlying operations are the same; for example, detach versus evict,...