Fast Object Database for Java - with JPA/JDO support

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Step 2: Define a JPA Entity Class

To store objects in an ObjectDB database using JPA we need to define an entity class: Open the [New ... .Serializable; import javax.persistence.*; @Entity public class Point implements Serializable ... . Besides the @Entity annotation and the id field (and its annotations) - the Point class
134

Step 2: Define a JPA Entity Class

To store objects in an ObjectDB database using JPA we need to define an entity class: Open the [New ... .Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; @Entity public ... in the database. Besides the @Entity annotation and the id field (and its annotations) - the Guest
134

Step 2: Entity Class and Persistence Unit

To store objects in an ObjectDB database using JPA we need to define an entity class: Open the [New ... .Date; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; @Entity public class Guest implements Serializable { private static final long
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Working with JPA Entity Objects

Entity objects are in-memory instances of entity classes (persistable user defined classes ... requires using entity objects for many operations, including storing, retrieving, updating and deleting database objects. Entity Object Life Cycle The life cycle of entity objects consists of four states
133

Step 2: Define a JPA Entity Class

To store objects in an ObjectDB database using JPA we need to define an entity class: Right click ... ; import java.io.Serializable; import javax.persistence.*; @Entity public class Point ... objects in the database. Apart from the @Entity annotation and the id field (and its annotations
133

Step 2: Define a JPA Entity Class

To store objects in an ObjectDB database using JPA we need to define an entity class: Open the [New ... .Serializable; import java.sql.Date; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; @Entity public class Guest implements Serializable
132

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.
132

Detached Entity Objects

Detached entity objects are objects in a special state in which they are not managed by any EntityManager but still represent objects in the database. Compared to managed entity objects, detached ... that have been loaded before detachment should be used. Changes to detached entity objects are not stored in
131

Shared (L2) Entity Cache

Every EntityManager owns a persistence context, which is a collection of all the entity objects ... an entity object that is already managed by the EntityManager returns the existing instance from the persistence context, rather than a new instantiated entity object. The scope of the persistence context
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detach(entity)

Method javax.persistence.EntityManager void detach( Object entity ) Remove the given entity from the persistence context, causing a managed entity to become detached. Unflushed changes made to the entity if any (including removal of the entity), will not be synchronized to the database. Entities

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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