Introduction Beginning Hibernate From Novice to Professional:
Hibernate is an amazing piece of software. With a little experience and the power of Java 5 annotations, you can build a complex database-backed system with disturbing ease. Once you have built a system using Hibernate, you will never want to go back to the traditional approaches.
While Hibernate is incredibly powerful, it presents a steep learning curve when you first encounter it—steep learning curves are actually a good thing, as they impart profound insight once you have scaled them. Yet gaining that insight takes some perseverance and assistance.
Our aim in this book is to help you up that learning curve by presenting you with the minimal requirements of a discrete Hibernate application, explaining the basis of those requirements, and walking you through an example application built according to them. We then provide additional material to be digested once the fundamentals are firmly understood.
Throughout, we provide examples rather than relying upon pure discourse.
We hope that you will continue to find this book useful as a reference text long after you have become an expert on the subject.
Contents :
How This Book Is Structured
This book is informally divided into three parts.
Chapters 1 through 8 describe the fundamentals of Hibernate, including configuration, the creation of mapping files, and the basic APIs.
Chapters 9 through 11 then describe the use of queries, criteria, and filters to access the persistent information in more sophisticated ways.
Finally, the appendixes discuss features that you will use less often, or that are peripheral to the core Hibernate functionality. The following list describes more fully the contents of each chapter:
Chapter 1 : outlines the purpose of persistence tools and presents excerpts from a simple example application to show how Hibernate can be applied. It also introduces core terminology and concepts.
Chapter 2 : discusses the fundamentals of configuring a Hibernate application. It presents the basic architecture of Hibernate and discusses how a Hibernate application is integrated into an application.
Chapter 3 : presents the example application from Chapter 1 in its entirety, walking you through the complete process of creating and running the application. It then looks at a slightly more complex example and introduces the notion of generating the database schema directly from the mapping files.
Chapter 4 : covers the Hibernate life cycle in depth. It discusses the life cycle in the context of the methods available on the core interfaces. It also introduces key terminology and discusses the need for cascading and lazy loading.
Chapter 5 : explains why mapping information must be retained by Hibernate, and
demonstrates the various types of associations that can be represented by a relational database. It briefly discusses the other information that can be maintained within a Hibernate mapping.
Chapter 6 : explains how Hibernate lets you use the Java 5 Annotations feature to represent mapping information. It provides detailed examples for the most important annotations, and discusses the distinctions between the standard EJB 3 annotations and the proprietary Hibernate 3 ones.
Chapter 7 : explains how the XML-based mapping files can be used to represent mapping information in Hibernate. It provides examples for all of the most common mapping types and reference notes for the more obscure ones.
Chapter 8 : revisits the Hibernate Session object in detail, explaining the various methods that it provides. The chapter also discusses the use of transactions, locking, and caching, and how to use Hibernate in a multithreaded environment.
Chapter 9 : discusses how Hibernate can be used to make sophisticated queries against the underlying relational database using the built-in Hibernate Query Language (HQL).
Chapter 10 : introduces the Criteria API, which is a programmatic analog of the query language discussed in Chapter 9.
Chapter 11 : discusses how the filter API can be used to restrict the results of the queries introduced in Chapters 9 and 10.
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