Apache OJB

Apache ObJectRelationalBridge

Developer(s)	Apache Software Foundation
Stable release	1.0.4 / December 31, 2005 (2005-12-31)
Written in	Java
Operating system	Cross-platform
Type	Object-relational mapping
License	Apache License 2.0
Website	http://db.apache.org/ojb/

Apache ObJectRelationalBridge (OJB) is an Object/Relational mapping tool that allows transparent persistence for Java Objects against relational databases.

Apache OJB was released on April 6th, 2005.

Features

• OJB is open source (open source code).
• Is also lightweight and easy to use, because to implement persistence layer one must simply configure two files (see section below)
• Easy to integrate into an existing application, because it does not generate code.
• Allow the use of different patterns of persistence: owner (PersistenceBroker API), JDO and Object Data Management Group (ODMG).

Configuration

At least two files are required to configure OJB:

• OJB.properties
• repository.xml

Allocation

For mapping a 1-1 relationship, for example, you have two tables: person and account. In this case, a person has an account and vice versa.

See also

• Apache OpenJPA

External links

• Apache ObJectRelationalBridge