By Mike Keith, Merrick Schincariol, Jeremy Keith
ISBN-10: 1430219564
ISBN-13: 9781430219569
ISBN-10: 1430219572
ISBN-13: 9781430219576
Pro JPA 2 introduces, explains, and demonstrates the way to use the Java patience API (JPA). JPA presents Java builders with either the information and perception had to write Java functions that entry relational databases via JPA.
Authors Mike Keith and Merrick Schincariol take a hands–on method of instructing by means of giving examples to demonstrate every one idea of the API and exhibiting the way it is utilized in practice.
the entire examples use a typical version from an overriding pattern software, giving readers a context from which to begin and aiding them to appreciate the examples inside an already normal area.
After finishing the ebook, you could have an entire realizing and manage to effectively code functions utilizing JPA. The booklet additionally serves as a reference advisor in the course of preliminary and later JPA software experiences.
- Hands-on examples for the entire features of the JPA specification, in response to the reference implementation of this specification
- A distinct part on migration to JPA
- Expert perception approximately numerous points of the API and once they are worthwhile
- Portability tricks to supply elevated wisdom of the potential of non–portable JPA code
Read Online or Download Pro JPA 2: Mastering the Java™ Persistence API PDF
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Extra resources for Pro JPA 2: Mastering the Java™ Persistence API
Example text
Commercial products like TopLink were available in the earliest days of Java and were successful, but the techniques were just never standardized for the Java platform. It was later, when upstart open source object-relational mapping solutions such as Hibernate became popular, that changes around persistence in the Java platform came about, leading to a convergence toward object-relational mapping as the preferred solution. These two products and others could be easily integrated with all the major application servers and provided applications with all the persistence features they needed.
We recommend that you remember these defaults as you learn them. After all, a default value is still part of the configuration of the application; it is just really easy to configure! Creating an Entity Regular Java classes are easily transformed into entities simply by annotating them. In fact, by adding a couple of annotations, virtually any class with a no-arg constructor can become an entity. Let’s start by creating a regular Java class for an employee. Listing 2-1 shows a simple Employee class.
Each scenario involves foreign key relationships between the various tables, but in order for there to be a foreign key relationship, the target table must have a primary key. And so before we even get to associate employees and addresses with each other we have a problem. 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.
Pro JPA 2: Mastering the Java™ Persistence API by Mike Keith, Merrick Schincariol, Jeremy Keith
by Michael
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