By Mike Keith, Merrick Schincariol

Pro JPA 2 introduces, explains, and demonstrates the best way to use the Java endurance API (JPA). JPA offers Java builders with either the information and perception had to write Java purposes that entry relational databases via JPA.

Authors Mike Keith and Merrick Schincariol take a hands–on method of instructing through giving examples to demonstrate every one inspiration of the API and exhibiting the way it is utilized in practice.
the entire examples use a standard version from an overriding pattern program, giving readers a context from which to begin and assisting them to appreciate the examples inside of an already typical area.
After finishing the publication, you might have a whole knowing and have the ability to effectively code functions utilizing JPA. The publication additionally serves as a reference consultant in the course of preliminary and later JPA program experiences.
* Hands-on examples for the entire features of the JPA specification, in keeping with the reference implementation of this specification
* a distinct part on migration to JPA
* professional perception approximately a number of elements of the API and once they are priceless
* Portability tricks to supply elevated information of the opportunity of non–portable JPA code
<h3>What you’ll learn</h3> * start with firm functions utilizing JPA 2
* wake up to hurry with object–relational mapping and Entity supervisor
* research and use queries and the question language (JP QL)
* hire complex object–relational mapping ideas
* Use XML mapping records and study different complicated suggestions
* package deal and installation your Java endurance functions
* attempt your Java patience purposes
* Migrate your Java patience purposes
<h3>Who this booklet is for</h3>
The publication commonly goals company and patience builders who fall in a single of 3 categories:
* those people who are new to patience; we'll current a few history info and introduce those readers to the fundamental patience innovations to convey them in control.
* those that comprehend and/or use existing ORM patience items comparable to Hibernate or TopLink.
* those that have already used JPA and need to profit about newer features introduced by JPA 2, or have an outstanding reference ebook to refer to once they improve JPA purposes.

In common, we think that the reader is a professional with Java, SQL, and JDBC, and has a bit wisdom of J2EE.
<h3>Table of Contents</h3><ol> * creation
* Getting begun
* company functions
* Object-Relational Mapping
* assortment Mapping
* Entity supervisor
* utilizing Queries
* question Language
* standards API
* complicated Object-Relational Mapping
* complex issues
* XML Mapping records
* Packaging and Deployment
* checking out
* Migration

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Extra info for Pro JPA 2: Mastering the Java™ Persistence API

Sample text

Persistent identity, or an identifier, is the key that uniquely identifies an entity instance and distinguishes it from all the other instances of the same entity type. An entity has a persistent identity when there exists a representation of it in the data store; that is, a row in a database table. If it is not in the database then even though the in-memory entity may have its identity set in a field, it does not have a persistent identity. The entity identifier, then, is equivalent to the primary key in the database table that stores the entity state.

The domain class Address does not have an identifier, yet the table that it would be stored in must have one if it is to be part of relationships. We could construct a primary key out of all of the columns in the ADDRESS table, but this is considered bad practice. Therefore the ID column is introduced and the object relational mapping will have to adapt in some way. 5 CHAPTER 1 ■ INTRODUCTION Figure 1-4. Three scenarios for relating employee and address data Scenario (A) of Figure 1-4 shows the ideal mapping of this relationship.

Enterprise developers have problems to solve, and they need features sufficient to solve those problems. What they don’t like is being forced to eat a heavyweight persistence model that introduces large overhead because it is solving problems that many do not even agree are problems. • Local, but mobile. A persistent representation of data does not need to be modeled as a full-fledged remote object. Distribution is something that exists as part of the application, not part of the persistence layer.

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