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)

Envers


Hibernate, since version 4, fully supports entity versioning, and it's called envers. This is very useful for keeping track of changes to each audited entity. In this section, you will see how to configure envers, choose the right strategy for entity auditing, and handle associated entities.

Configuration

The first thing you need to do is to add the appropriate JAR and class path to your project. Hibernate envers are packaged separately, so you'll have to add the Maven dependency:

<dependency>
  <groupId>org.hibernate</groupId>
  <artifactId>hibernate-envers</artifactId>
  <version>${envers-version}</version>
</dependency>

Once you have resolved the jar dependency, you could simply add the @Audited annotation to the entity that you wish to track:

@Entity
@Audited
public class Person {
  @Id
  @GeneratedValue
  private long id;
  private String firstname;
  private String lastname;
  private String ssn;
  private Date birthdate;

  // getters...