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)

Summary


The purpose of this chapter was to expose the internals of Hibernate as they relate to session and entity. This should help you understand Hibernate better, design and write more elegant code, and when you encounter errors, understand the error messages clearly.

You will see a lot more sample code in later chapters, but in this chapter, we focused more on understanding Hibernate, and less on samples.

We learned about session and its behavior in various contexts. We also learned about entity, explored its lifecycle, and also learned about map types, which is a dynamic entity. Furthermore, the discussion on entity identity is very important and deserves careful attention. As discussed in this chapter, Hibernate offers a rich set of features, which are not available in JPA. We will see more of them in future chapters. Finally, we talked about proxy objects and batch processing.

This chapter is the heaviest in content. In the following chapters, we will focus on specific topics and explore different ways to accomplish certain objectives using Hibernate. The next chapter covers mapping concepts, and you will take a look at how basic and advanced mapping can fill the gap between objects and relations.