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)

Chapter 1. Entity and Session

In this chapter, we will take an in-depth look at sessions and entities and their lifecycles. It is important to understand the concepts of session and entity when we talk about design concepts, such as session-per-request, session-per-conversation, stateless sessions, and contextual sessions, and discuss the various states of an entity. After all, the only way to master anything is by paying attention to the details. We also explore entities beyond their JPA characteristics and look at Hibernate entities to see the benefits of one over the other. Furthermore, we discuss proxy objects and how they are used.

In this chapter, we will cover the following topics:

  • Why this book?

  • Quick Hibernate

  • Hibernate session:

    • Session internals

    • Contextual sessions

    • Sessions per request, per conversation, and per operation

    • Stateless sessions

  • Hibernate entities:

    • Entity lifecycle

    • Types of entities

    • Identity crisis

    • Beyond JPA

  • Proxy objects

  • Batch processing:

    • Manual batch management

    • Setting the size of the batch

  • Using a stateless session