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Database Doctor

over FTP in ASCII mode (BINARY mode should be used). Deleting an ObjectDB database recovery file or

Obtaining a JPA Database Connection

, update, and delete should only be performed within an active transaction. Given an EntityManager, em

Database Schema Evolution

Modifications to entity classes that do not change their persistent field definitions (their schema) are transparent to ObjectDB. This includes adding, removing and modifying constructors, methods and non persistent fields. However, additions, deletions and modifications to the persistent fields

ObjectDB 2.8 Developer's Guide

, retrieve, update and delete database objects. Explains how to use the JPA Query Language (JPQL). Presents

General Settings and Logging

an archived log file is automatically deleted. The <logger> elements <logger name="*" level

JPA Primary Key

are deleted from the database. The primary key value of an entity can be accessed by declaring a primary


.0 void deletePersistent(Object pc) Delete the persistent instance from the data store. Delete ... of the instance persistent, the closure of the instance is not deleted from the data store. This method has no effect if the instance is already deleted in the current transaction. This method throws


) for the element Default value: {} Since: JDO 2.1 ForeignKeyAction deleteAction Delete action to apply to any foreign key for the element. Delete action to apply to any foreign key for the element. Returns: delete action to apply to any foreign key for the element Default value: javax.jdo.annotations


Method javax.jdo.Query long deletePersistentAll() Deletes all the instances of the candidate class that pass the filter. Returns the number of instances of the candidate class that were deleted ... if deletePersistent were called on them. Specifically, if the class of deleted instances implements


This interface is implemented by listeners to be notified of delete events. Since: JDO 2.0 void postDelete( InstanceLifecycleEvent event) Invoked whenever a persistent instance is deleted, for example ... is deleted, for example during javax.jdo.PersistenceManager.deletePersistent. This method is called

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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