New PDF release: Hibernate Quickly

By Patrick Peak

ISBN-10: 1932394419

ISBN-13: 9781932394412

A concise advent to Hibernate's many configuration and layout strategies, this publication distills Hibernate into digestible items with many code examples, useful utilization situations, and assurance of the instruments to be had to builders writing Hibernate functions. utilizing a move slowly, stroll, run instructing technique, builders will examine what Hibernate is, what it could possibly do, and the way it may be used successfully. New Hibernate beneficial properties are coated and the supplied code examples are incrementally advanced as new suggestions are brought. The examples integrated execute from Ant and run as JUnit attempt instances. An figuring out of JUnit isn't really required and operating the code as a chain of try circumstances permits the simply proven performance with no resorting to a sophisticated internet software. How Hibernate can paintings with different universal improvement instruments and frameworks like XDoclet, Struts, Webwork, Spring, and Tapestry can be mentioned in addition to writing mapping documents and developing institutions.

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If the ID type is a primitive, such as int or long, a value of 0 indicates a transient object. ) In both cases, a SQL INSERT should be issued after converting the object to a relational format. Otherwise, an UPDATE would be issued for the object, keyed on the value of the ID. At what point is the value of the id property assigned? If the database supports identity columns or sequences, you can let the database assign the ID value. Alternatively, you can have the application assign the ID value, but this must be handled carefully.

The impedance mismatch is caused by the differences between object and relational schemas. Most developers who have used direct JDBC to store objects are aware the mismatch exists, even if they don’t know the name for it. We’ll look at a few areas of the impedance mismatch next. 1 Identity One of the more significant areas of the impedance mismatch is in regard to identity. equals(objectB); So, objects can either be identical or equal. If two objects are identical, they’re the same object. If the objects are equal, they contain the same values.

For instance, if tables refer to each other through columns other than primary keys, your chosen ORM solution may have trouble adapting to the legacy schema. 4. Admittedly, this schema is a contrived example; but before you dismiss it, realize that schemas even more poorly designed than this exist in enterprise applications. Just what’s wrong with this schema? None of the tables have a surrogate primary key. By a surrogate key, we mean that the table’s primary key has no business significance. All the columns in the tables are relevant to the business problem.

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Hibernate Quickly by Patrick Peak


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