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)

Concurrency


Transactions offer the functionality to group multiple work units into one big unit of work, but you can further configure Hibernate to achieve better isolation in a concurrent environment. What defines concurrency parameters is transaction isolation levels as well as locking mechanisms. These concepts also require that you learn the capabilities and the behavior of the specific RDBMS that you are using because both of them are implemented by the database systems and are not Hibernate features. For this reason, you need to carefully explore the various options with your specific database system. Here, we will discuss them to show you how to control them through Hibernate.

Lastly, when dealing with concurrency issues, you'll also need to keep in mind the first-level and second-level cache, as they can play an important role in identifying problems. We discussed this topic in Chapter 5, Hibernate Cache.

Isolation levels

Transactions let you isolate your unit of work from someone else...