JDO

Posted on 2009-09-29 filed under: Java (RSS) 43 views

JDO

JDO (Java Data Object) is a Java Object Persistence of new norms, but also a data warehouse for access to certain objects in the standardization of the API. JDO provides transparent object storage, and therefore developers, the stored data objects do not need extra code (for example, the use of JDBC API). These tedious routine work has been transferred to the JDO product providers who allow developers out in order to focus time and energy on the business logic. In addition, JDO is flexible because it can run on the bottom of any data. JDBC is oriented relational database (RDBMS) JDO more common to provide any data to the bottom of the storage function, such as relational databases, files, XML and object-oriented database (ODBMS), etc., makes the application more portable.
Application developers by visiting JDO Instance, to achieve access to the JDO Instance data objects represent, including: ERP, database systems. So that the data storage medium for the application developer completely transparent.
JDO was first convened by the Sun a large number of O / R Mapping development team jointly together, first identified through the need to include the contents of JDO, and then formally put forward a Java Specification Request (JSR-12), the official beginning of the JDO specification formulation. The following is a major milestone in the progress.
JSR # 000012 approved in July 1999
Group of experts to form 1999-8: including Sun, Apple, BEA, IBM, Oracle, SAP, WebGain completed 2000-5 public comments, such as 2000-6 draft 2001-3 in the JavaOne on the final draft of the introduction of 0.93
2001-5 final draft of 2001-6 in the JavaOne release 0.96 on the final draft of 0.98 to start 2001-11
2002-4 version 1.0 officially announced 2002-8 1.0.1 Revision 2.0 specification to start 2003-8 ...