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作者	What's J2EE's JDO technology?
terence 发贴: 0 积分: 0	于 2003-02-13 12:29 What's JDO? How use JDO? Pls tell me ...........Thanks

作者	Re:What [Re:terence]
terence 发贴: 0 积分: 0	于 2003-02-13 12:33 Now it's popular technology in J2EE. http://java.sun.com/products/jdo/

作者

Re:What [Re:terence]

terence

发贴: 0
积分: 0

于 2003-02-13 12:40

Java Data Objects
The Java Data Objects (JDO) API is a standard interface-based Java model abstraction of persistence, developed as Java Specification Request 12 under the auspices of the Java Community Process. Application programmers use JDO to directly store their Java domain model instances into the persistent store (database).

Alternatives to JDO include direct file I/O, serialization, JDBC, and Enterprise Java Beans (EJ Black Eye

Bean Managed Persistence (BMP) or Container Managed Persistence (CMP) Entity Beans. Benefits to application programmers when using JDO include:

Portability: applications written with the JDO API can be run on multiple implementations without recompiling or changing source code.

Database independence: applications written with the JDO API are independent of the underlying database.

Ease of use: application programmers focus on their domain object model and leave the details of persistence (field-by-field storage of objects) to the JDO implementation.

High performance: application programmers delegate the details of persistence to the JDO implementation, which can optimize data access patterns for optimal performance.

Integration with EJB: applications can take advantage of EJB features such as remote message processing, automatic distributed transaction coordination, and security, using the same domain object models throughout the enterprise.

作者

JDO resources [Re:terence]

why

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总版主

发贴: 4629
积分: 388

于 2003-03-01 23:52

JDOCentral.com - Developer's Community for Java Data Objects
http://www.jdocentral.com/

Java Data Objects by Robin Roos
http://www.ogilviepartners.com/JdoBook.html
http://groups.yahoo.com/group/TheJavaDataObjectsBook/

Simplifying Domain Model Persistence in a J2EE application by using JDO
Learn how to use Java Data Objects (JDO) to accelerate development and test your domain model outside of the application server and without a database. This article looks at an example application and its JDO implementation, then goes into object-relational mapping issues with JDO, including object identity and how to persist embedded value objects. You will learn how to write code that invokes JDO APIs in a way that works both inside and outside an application server, and learn how to design the session façade to make testing easier.

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