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Chapter 2 - JPA Entity Classes

JPA Entity classes are user defined classes whose instances can be stored in a database. To store data in an ObjectDB database using JPA you have to define entity classes that represent your application data object model. This chapter explains how to define and use entity classes.

Eclipse Public License - v 1.0

may accept certain responsibilities with respect to end users, business partners and the like

Entity Management Settings

method for instances of serializable types that are non persistable otherwise (e.g. a user defined

BIRT/ODA ObjectDB Driver

- either embedded (e.g. c:\points.odb) or client-server (e.g. objectdb://localhost/points.odb;user=admin

Comparison in JPQL and Criteria API

operators (=, <>, ==, !=). Instances of user defined classes (entity classes and embeddable classes


queries can only be executed within an active transaction and the changes are visible to other users

JPA Criteria API Queries

API may be preferred. For example, building a dynamic query based on fields that a user fills

Working with JPA Entity Objects

Entity objects are in-memory instances of entity classes (persistable user defined classes), which can represent physical objects in the database. Managing an ObjectDB Object Database using JPA requires using entity objects for many operations, including storing, retrieving, updating and deleting

ObjectDB Overview

. Advanced querying and indexing capabilities. Effective in heavy loaded multi-user environments

Step 2: Entity Class and Persistence Unit

.odb"/> <property name="javax.persistence.jdbc.user" value="admin"/> <property name

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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