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Deleting JPA Entity Objects

object references, if any). Orphan Removal JPA 2 supports an additional and more aggressive remove ... when many entity objects have to be deleted in one operation. The DELETE Queries in JPA/JPQL in chapter 4 explains how to use JPA DELETE queries.
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JPA Primary Key

required. But ObjectDB also supports explicit standard JPA primary keys, including composite primary ... ; : } When an entity has multiple primary key fields, JPA requires defining a special ID class ... values. Obtaining the Primary Key JPA 2 provides a generic method for getting the object ID (primary
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JPA Annotations for JPQL Queries

The following annotations are used to define static named JPA queries: The JPA Named Queries section of the ObjectDB Manual explains and demonstrates how to use these annotations to define named JPQL queries.
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JPA Annotations for Java EE

The following JPA annotations are in use to integrate JPA into a Java EE application and are managed by the Java EE container:
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JPA Annotations for Classes

JPA defines three types of persistable classes which are set by the following annotations: Chapter 2 of the ObjectDB manual explains these annotations in detail. Entity and mapped super classes ... policy (as explained in chapter 3): Another JPA class annotation defines an ID class: ID classes
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NetBeans/JPA Java EE Tutorial

This is the NetBeans version of the Java EE JPA tutorial. It demonstrates how to create and run ... and JPA. The demo web application manages a basic guestbook page. Every visitor can sign the guestbook ... : Persistence is managed by JPA. Every visitor that has signed the guestbook is represented by a Guest entity
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NetBeans/JPA Web Application Tutorial

This is the NetBeans version of the JPA Web App tutorial. It demonstrates how to create and run ... modifications are needed for Tomcat 7.0), ObjectDB and JPA. The demo web application manages a basic ... that have already signed are listed below the form: Persistence is managed by JPA. Every visitor
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Spring MVC JPA Tutorial - NetBeans Project

To open and run the Spring MVC JPA tutorial project in NetBeans: Download and extract the project zip file: Spring MVC JPA - Maven Project (8KB) Open the Maven project in NetBeans: Select File > Open Project.... Select the guestbook-spring directory and click Open Project. Run the project: Select
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Spring MVC JPA Tutorial - Eclipse Project

To open and run the Spring MVC JPA tutorial project in Eclipse: Download and extract the project zip file: Spring MVC JPA - Maven Project (8KB) Open the Maven project in Eclipse: Select File > Import... > Maven > Existing Maven Projects and click Next. Select the guestbook-spring directory as Root
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JPA Web Application Tutorial

This tutorial demonstrates how to create and run a database driven Java web application using Tomcat 6, ObjectDB and JPA. The demo web application manages a basic guestbook page. Every visitor ... below the form: Persistence is managed by JPA. Every visitor that has signed the guestbook is represented by

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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