Download e-book for iPad: Hibernate in Action by Christian Bauer

By Christian Bauer

ISBN-10: 193239415X

ISBN-13: 9781932394153

Hibernate virtually exploded at the Java scene. Why is that this open-source device so well known? since it automates a tedious job: persisting your Java gadgets to a relational database. The inevitable mismatch among your object-oriented code and the relational database calls for you to jot down code that maps one to the opposite. This code is frequently advanced, tedious and dear to strengthen. Hibernate does the mapping for you.Not basically that, Hibernate makes it effortless. situated as a layer among your software and your database, Hibernate looks after loading and saving of items. Hibernate purposes are more affordable, extra transportable, and extra resilient to alter. they usually practice larger than something you are going to increase yourself."Hibernate in motion" conscientiously explains the innovations you wish, then will get you going. It builds on a unmarried instance to teach you the way to take advantage of Hibernate in perform, tips on how to care for concurrency and transactions, tips on how to successfully retrieve items and use caching.The authors created Hibernate they usually box questions from the Hibernate group each day-they understand how to make Hibernate sing. wisdom and perception seep out of each pore of this book."What's Inside"- ORM thoughts- Getting all started- Many real-world initiatives- The Hibernate program improvement method

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The usual solution to this problem is to bend and twist the object model until it matches the underlying relational technology. This can be done successfully, but only at the cost of losing some of the advantages of object orientation. Keep in mind that relational modeling is underpinned by relational theory. Object orientation has no such rigorous mathematical definition or body of theoretical work. So, we can’t look to mathematics to explain how we should bridge the gap between the two paradigms—there is no elegant transformation waiting to be discovered.

This business layer communicates with the persistence layer beneath in order to load and store the persistent objects of the domain model. ORM is the middleware in the persistence layer that manages the persistence. ORM isn’t a silver bullet for all persistence tasks; its job is to relieve the developer of 95 percent of object persistence work, such as writing complex SQL statements with many table joins and copying values from JDBC result sets to objects or graphs of objects. A full-featured ORM middleware might provide database portability, certain optimization techniques like caching, and other viable functions that aren’t easy to hand-code in a limited time with SQL and JDBC.

The business logic is never executed in the database (as an SQL stored procedure), it’s implemented in Java. This allows business logic to make use of sophisticated object-oriented concepts such as inheritance and polymorphism. For example, we could use wellknown design patterns such as Strategy, Mediator, and Composite [GOF 1995], all of which depend on polymorphic method calls. Now a caveat: Not all Java applications are designed this way, nor should they be. Simple applications might be much better off without a domain model.

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Hibernate in Action by Christian Bauer


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