Detailed comparison of ODMG 3.0 and JDO

Posts on the
Design Decomposition Blog

You might have seen the recent news reports about the collision between U.S. and Russian communication satellites. The U.S. satellite was one of the Iridium satellites. What wasn’t reported and you probably don’t know is that an object database management system (ODBMS) is an important part of the Iridium system. Even though ODBMSs are a [...]
February 13, 2009

(The Acronym) SOA is (Perhaps) Dead (at Some Companies); Long Live Services

I am now also posting on the Cutter Blog. My initial posting is (The Acronym) SOA is (Perhaps) Dead (at Some Companies); Long Live Services. It is a response to Anne Thomas Manes’ SOA is Dead; Long Live Services on her blog at the Burton Group.
January 9, 2009

Atomicity

The typical definition of an atomic task or process is one that cannot be decomposed further. This is vague and subject to interpretation. The Decomposition Matrix on this site uses a specific definition: A task (for business process diagrams) or a process (for data flow diagrams) is atomic if every input relates to every output [...]
December 3, 2008

Well-Formed Business Process Diagrams

My last posting referenced the criteria for a well-formed business process diagram mentioned in Business Process Driven SOA using BPMN and BPEL by Matjaz B. Juric and Kapil Pant. I am going to expand on their criteria to create a more comprehensive definition of a well-formed business process diagram. To start, here are three criteria [...]
November 18, 2008

Recent Business Process Modeling Books

I recently received two new books on business process modeling. Both books looked interesting because they had great titles. As it turns out, one book is great and the other not so good. The not so good book is Business Process Driven SOA using BPMN and BPEL by Matjaz B. Juric and Kapil Pant. There [...]
October 9, 2008

The Design Decomposition Blog
is written by Doug Barry.

This table shows a summary of the similarities and differences between the two approaches to transparent persistence: ODMG 3.0 and JDO. It is from a presentation at JavaOne by Heiko Bobzin of POET Software.

ODMG 3.0	JDO
Object Model
Transparent Persistence	Transparent Persistence
Persistence by Reachability	Persistence by Reachability
Java, C++, and Smalltalk Language Bindings on top of ODMG object model	Tight integration with Java object model
Vendor specific interfaces	PersistenceCapable interface
Collection factory for five basic collections	Collection factory “by Example”, Second Class Objects
Object identity managed by database system	Three identity models (more)
Life Cycle
Objects live until transaction completes	Objects can live as long as PersistenceManager (more)
Objects can not be accessed after transaction completes	API allows the setting of properties
Callbacks not defined	Callbacks for load, store, delete, and clear
Databases and Transactions
Easy to use but proprietary database and transaction management	Databases, connections and transactions fit into other Java APIs
No distributed transactions defined	Support for distributed transactions
Vendor specific extensions for managed environments (EJB)	Support for managed environments (EJB)
Vendor specific extension for optimistic locking	Optimistic locking is optional API
Explicit locking of objects	No explicit locking -- locks set automatically
Query
OQL: an extensive object query language	Queries based on Java programming language -- JDOQL (more)
Complex query expressions	Simple filter strings
Results can be compositions, projections or just an integer	Results are always collections of persistence capable objects
Class name is part of query string	Class objects explicitly used as parameters
No imports or name scope	Imports, "this", named parameters

For more information on transparent persistence, see:

Also see transparent persistence vs. JDBC call-level interface (new window).

For more information on ODMG 3.0 and JDO as well as other database specifications, see the related content below.

More on the general topic: DBMS standards

Copyright © 2000-2010 Barry & Associates, Inc. All Rights Reserved.
You can use this material for your work or classes. Click here for our reprint policy.

Related books at Amazon.com

Object-oriented Data Structures Using Java
by Nell B. Dale
Average Customer Review:

based on 6 reviews.
Customer Review: This seller was very punctual with the shipping and delivery of the book and it was in very good condition like the ad had stipulated. I will recomment him to anyone ST

Data Structures and Other Objects Using Java (3rd Edition)
by Michael Main
Average Customer Review:

based on 17 reviews.
Customer Review: Even after taking a mid-level CS course where this book was the required text, this book still sits on my bookshelf at work for reference. Why? Well, certainly it is not the most comprehensive book of data structures in existence, nor is it written with a scholarly tone. But, that's the point! Michael Main's writing has the air of a...

Objects, Abstraction, Data Structures and Design: Using Java version 5.0
by Elliot B. Koffman, Paul A. T. Wolfgang
Average Customer Review:

based on 5 reviews.
Customer Review: A reader wrote that, "this book fails to address concurrency issues". But the books title never commits this. It's about teaching data-structures using Java (correctly). And it exactly does this with great success. Although I read it to refresh my knowledge, I enjoyed a lot as I learn the subject first time. It's CS for beginners, bu...

More related books: Search Amazon.com for Java Data Objects

Detailed comparison of ODMG 3.0 and JDO

Read more free articles on this site

Search this site for more articles

Browse this site for more articles

Related recent articles from Google News

Related books at Amazon.com