Download Beginning Hibernate: For Hibernate 5 by Joseph Ottinger , Jeff Linwood, Dave Minter PDF
By Joseph Ottinger , Jeff Linwood, Dave Minter
Get all started with the Hibernate five patience layer and achieve a transparent advent to the present typical for object-relational endurance in Java. This up-to-date version comprises the hot Hibernate 5.0 framework in addition to assurance of NoSQL, MongoDB, and different comparable applied sciences, starting from purposes to important facts. Beginning Hibernate is excellent if you’re skilled in Java with databases (the conventional, or hooked up, approach), yet new to open-source, light-weight Hibernate.
The e-book retains its concentrate on Hibernate with out losing time on nonessential third-party instruments, so you’ll be ready to instantly commence development transaction-based engines and purposes. skilled authors Joseph Ottinger with Dave Minter and Jeff Linwood supply extra in-depth examples than the other booklet for Hibernate newbies. They current their fabric in a full of life, example-based manner—not a dry, theoretical, hard-to-read fashion.
What you are going to Learn
Who This booklet Is For
Experienced Java builders attracted to studying easy methods to use and observe object-relational patience in Java and who're new to the Hibernate endurance framework.
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Additional info for Beginning Hibernate: For Hibernate 5
A Note on Transactions We’ve mentioned “transactions” quite a bit, too, using them with every session reference. So what are they? 6 When you start a transaction, you’re saying that you want to see the database as it exists at a certain point in time (“now”), and any modifications affect only the database as it exists from that starting point. Changes are committed as a whole, so that no other transaction can see them until the transaction completes. This means that transactions allow the application to define discrete units of work, with the user only having to decide the boundaries of when a transaction begins or ends.
5. The updating of data in the database via our object model. 6. The removal of data from the database via our object model. With all of this, we’re ready to start designing our actual application, armed with the knowledge that our object model works (although efficiency hasn’t been considered yet) and with example code to perform most of our tasks as our requirements specify. 6 We’re going to be revisiting transactions quite a bit in Chapter 4. Note that Hibernate has validation facilities that make this sort of thing very easy to do; the way this is described here is rather unglamorous.
Let’s do this first by creating our client code, which will give us an idea of what it is we need to write. See Listing 3-15. Listing 3-15. addRanking("J. C. getRankingFor("J. C. Smell", "Mule"), 8); } } 9 Note that Spring has its own ways to manage Hibernate Session references; using this in a Spring application would be ill-advised. 31 CHAPTER 3 ■ BUILDING A SIMPLE APPLICATION We haven’t written the interface or its implementation yet – which we’ll rectify in the next listing. Here, we’re just trying out the API to see how it looks and if it seems to fit what we need to do.