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Harnessing Hibernate is an ideal introduction to the popular framework that lets Java developers work with information from a relational database easily and efficiently. Databases are a very different world than Java objects, and they often involve people with different skills and specializations. With Hibernate, bridging these two worlds is significantly easier, and with this book, you can get up to speed with Hibernate quickly.
Rather than present you with another reference, Harnessing Hibernate lets you explore the system, from download and configuration through a series of projects that demonstrate how to accomplish a variety of practical goals. The new edition of this concise guide walks you through Hibernate's primary features, which include mapping from Java classes to database tables, and from Java data types to SQL data types. You will also learn about Hibernate's data query and retrieval facilities, and much more.
By reading and following along with the examples, you can get your own Hibernate environment set up quickly and start using it for real-world tasks right away. Harnessing Hibernate teaches you how to:
- Perform Object/Relational mapping
- Work with persistent data from Java code
- Work with groups and relationships between objects
- Extend Hibernate's rich type support for your own needs
- Simplify query creation using criteria and examples
- Use the Hibernate Query Language (HQL) and understand how it differs from SQL
- Use Hibernate in conjunction with Spring
- Use Hibernate in conjunction with other packages, such as the Stripes web framework and the Eclipse IDE
Once you're past the first few chapters, you can jump to topics that you find particularly interesting or relevant. All background material and explanations of how Hibernate works and why is in the service of a focused task. Source code can be downloaded from the book's website.
If using SQL is an uncomfortable chore, Harnessing Hibernate offers you an effective and trouble-free method for working with the information you store in your applications.
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For example, the book does not cover second-level caching in Hibernate. This is a key feature which can improve application performance, but there is no reference for it in the index and almost no mention of it in the book. It just says 'switch off caching' around page 50 and doesn't mention it again. Also, there is no discussion of locking strategies - e.g. optimistic vs pessimistic locking - which is essential to understand if you are building critical systems. Both of these are of course covered in the reference documentation as well as in books such as 'Pojos in Action'.
The books repeatedly says 'look at the reference documentation for more detail'. Personally, I think you'd be better off ONLY reading the reference documentation. The reference documentation is fewer pages and far more useful, as well as being free.
However, there are problems. As another reader mentioned, the book spends far too much time explaining Maven, which is unnecessary, and could be the subject of another book.
Although the style is clear, with plenty of code examples, I do feel that this book skims the surface. It's ok as a gentle introduction to Hibernate, but the text uses the phrase "refer to Hibernate reference manual for more details" a bit too often.
I was also very disappointed to find that although there is much discussion about how to handle object associations, there appears to be absolutely no discussion of object inheritance. This is a fundamental concept of Object oriented programming, and I would expect any Hibernate book to explore the techniques used to persist object hierarchies.
On balance, if you are already familiar with Hibernate, this is probably not the book for you. However newcomers will learn a lot from it, and the style is very accessible. Just don't expect to find a comprehensive guide to Hibernate here.
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