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Developing Middleware in Java EE 8

You're reading from   Developing Middleware in Java EE 8 Build robust middleware solutions using the latest technologies and trends

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Product type Paperback
Published in Jun 2018
Publisher Packt
ISBN-13 9781788391078
Length 252 pages
Edition 1st Edition
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Author (1):
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Abdalla Mahmoud Abdalla Mahmoud
Author Profile Icon Abdalla Mahmoud
Abdalla Mahmoud
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Table of Contents (18) Chapters Close

Title Page
Copyright and Credits
Dedication
Packt Upsell
Contributors
Preface
1. Delving into Java EE 8 FREE CHAPTER 2. Dependency Injection Using CDI 2.0 3. Accessing the Database with JPA 2.1 4. Validating Data with Bean Validation 2.0 5. Exposing Web Services with JAX-RS 2.1 6. Manipulating JSON with JSON-B 1.0 7. Communicating with Different Systems with JMS 2.0 8. Sending Mails with JavaMail 1.6 9. Securing an Application with Java Security 1.0 10. Making Interactive Applications with WebSockets 1.1 1. Other Books You May Enjoy Index

Mapping inheritance


There are times when it will be very useful for entities to inherit from each others. Suppose, for example, that two entities Actor and Director exist, and each has a set of common attributes (name and birth date), but each has other specific attributes. It's very natural to create a Person superclass for them, putting inside it all the common attributes, then make both theActorandDirectorinherit from it.

The question is, if we have used the mentioned design, how will our entities be mapped to the database ? In JPA, there are three inheritance strategies that can be used to achieve inheritance mapping:

  • Single table strategy
  • Joined table strategy
  • Table per class strategy

In the following sections, we are going to look at each strategy in detail.

Single table strategy

In the single table strategy, only one table will be used to represent all entities in the inheritance relationship. All common attributes, as well as the specific attributes, will be used as columns in one table...

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