Press Release
May 7, 2003
Storing Java Objects with Ease: O'Reilly Releases "Java Data Objects"
Sebastopol, CA--Java Data Objects, or JDO, allows Java developers to
manage data without any specialized knowledge of the underlying
database software or database query languages. The idea behind JDO is
to provide database persistence in Java in a way that is both
convenient and natural for Java programmers. For instance, programmers
don't need to learn SQL, don't need to tediously copy data into and out
of Java objects using JDBC calls, and can use Java classes, fields, and
references in a way that is natural--without a lot of extra method
calls and coding. Programmers can even write queries using Java
predicates instead of SQL. In short, they just write Java; the
persistence part is automatic. Although JDO is relatively new, many
development organizations have already discovered its simplicity and
utility. Java Data Objects by David Jordan, a key contributor to JDO,
and Craig Russell, the Specification Lead for JDO, (O'Reilly, US
$39.95), is the definitive work on this important new Java API.
"Java Data Objects let a developer apply the object paradigm and focus
on designing a single information model in the form of a Java object
model, using all the object-oriented capabilities provided by the Java
language," explains coauthor Jordan. "They can store these object
models in a wide variety of databases with transactional access. They
can use a query language that is based on their Java object model and
uses Java operators and syntax. No other persistence technology
provides this, including serialization, Java DataBase Connectivity
(JDBC), and Enterprise JavaBeans Container Managed Persistence (EJB
CMP).
"Applications can access and navigate to objects in the database
without even having to make explicit calls to JDO interfaces," Jordan
adds. "A JDO implementation gives the illusion that all the objects
that the application needs are in memory. It brings them in from the
database as needed, automatically marks them as updated, and assumes
control of mapping all the updates to objects and their
interrelationships back to the database. A major task of developing
applications is the migration of data between its in-memory
representation and its storage representation. With JDO this is no
longer necessary. So it substantially reduces the costs of developing
applications."
"Java Data Objects" provides a thorough introduction to JDO, starting
with a simple application that demonstrates many of JDO's capabilities.
The authors introduce JDO's interfaces, discuss class enhancement and
JDO's optional features, and familiarize readers with JDO
architectures. The next part of the book deals with object modeling,
schema design, and aspects of the JDO development process.
Once the basics have been covered, the authors guide readers through
the process of establishing a JDO runtime environment, which includes
connecting to a datastore and issuing transactions. In subsequent
chapters, they cover aspects of using JDO to store, access, and query
instances in the datastore. More advanced chapters cover optional
features such as nontransactional access and optimistic transactions.
"Java Data Objects" concludes with a discussion of the use of JDO in
web applications and J2EE environments.
JDO makes application development simpler and much faster, and "Java
Data Objects" provides the most authoritative and complete coverage of
this interesting new technology. This book is a must for enterprise
developers using Java, or any Java developer who writes applications to
access databases.
Additional Resources:
Java Data Objects
David Jordan, Craig Russell
ISBN 0-596-00276-9, 356 pages, $39.95 (US), $61.95 (CAN), 28.50 (UK)
order@oreilly.com
1-800-998-9938; 1-707-827-7000
About O'Reilly
O'Reilly Media spreads the knowledge of innovators through its books, online services, magazines, and conferences. Since 1978, O'Reilly Media has been a chronicler and catalyst of cutting-edge development, homing in on the technology trends that really matter and spurring their adoption by amplifying "faint signals" from the alpha geeks who are creating the future. An active participant in the technology community, the company has a long history of advocacy, meme-making, and evangelism.
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