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ObjectDB 2.8 Developer's Guide

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

JPA Lifecycle Events

flush). @PostLoad - after an entity has been retrieved from the database. @PreUpdate

What is ObjectDB?

ObjectDB is an Object Oriented Database Management System (ODBMS). It provides all the standard database management services (storage and retrieval, transactions, lock management, query processing, etc.), but it uses an object oriented model to store and manage data. You can easily store ordinary

Detached Entity Objects

). Retrieval by navigation from detached objects is not supported, so only persistent fields

Database Explorer

. This setting is relevant only in the Explorer. In your applications - retrieved String instances

Deleting JPA Entity Objects

Existing entity objects can be deleted from the database either explicitly by invoking the remove method or implicitly as a result of a cascade operation. Explicit Remove In order to delete an object from the database it has to first be retrieved (no matter which way) and then in an active

ObjectDB Object Database Features

are retrieved from the database automatically by navigating from other managed objects. Transparent

Step 5: Add a JSP Page

for signing the guestbook, followed by a list of all the guests that have already signed (which are retrieved

Step 4: Add a Servlet Class

are retrieved from the database and stored in the request's "guest" attribute. Then the processing

Step 2: Define a JPA Entity Class

class that stores and retrieves instances of the Point entity class.

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.

Need Help?

  1. Search ObjectDB website
  2. Read the FAQ
  3. Follow the Tutorials
  4. View or post in the forum
  5. Search or file an issue
  6. Contact support