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ObjectDB 2.8 Developer's Guide

Welcome to ObjectDB for Java/JPA Developer's Guide. Here you can learn how to develop database applications using ObjectDB and JPA (Java Persistence API). The main purpose of this guide is to make you productive with ObjectDB and JPA in a short time. Guide Structure This manual is divided into

JPA 2 Annotations

JPA defines dozens of annotations that can be divided into the following groups: Annotations for JPA aware classes: Annotations for fields in JPA persistable classes: Annotations for additional JPA configuration: Annotations for JPA lifecycle event callbacks: Java EE container annotations: Many


Existing entity objects can be updated, as explained in chapter 2, by: Retrieving the entity objects into an EntityManager. Updating the relevant entity object fields within an active transaction. Applying changes to the database by calling the commit method. JPQL UPDATE queries provide

JPA Primary Key

is defined the primary key value is automatically injected into that field by ObjectDB

Out of Memory - Slow leak?

has fixed the problem. The scenario is still the same: I have two "producer" processes which insert messages into an objectdb "queue" database running with an objectdb server process. I have one "consumer" process which reads messages from the queue database and inserts these into an embedded "normal

JPA Web App Tutorial - Eclipse Project

Integration for WTP is installed when the Maven project is imported into the IDE). Choose or define

Step 4: Add a Servlet Class

session bean, which is instantiated and injected by the application server into the guestDao field

Step 4: Add a Servlet Class

the application server into the guestDao field automatically (since the field is marked with the @EJB

JDO Reference (JavaDoc)

This reference contains the API documentation (similar to JavaDoc) of JDO 2.2. The content is derived from the original JDO documentation with some additions and notes. The most basic JDO types are: All the other JDO types are organized into the following sections:

[ODB1] Chapter 7 - JDOQL Queries

into two commands: Query query = pm.newQuery(Person.class, "this.age >= 18"); query.compile

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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