Apache OJB

Short description: Java software tool

Apache ObJectRelationalBridgeDeveloper(s)| Apache Software Foundation

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Stable release|

1.0.55 / December 31, 2005; 20 years ago (2005-12-31)

Written in| Java
Operating system| Cross-platform
Type| Object-relational mapping
License| Apache License 2.0
Website| db.apache.org/ojb/

Apache ObJectRelationalBridge (OJB) is an Object/Relational mapping tool that allows transparent persistence for Java Objects against relational databases. It was released on April 6, 2005.[1]

As of January 16, 2011 Apache ObJectRelationalBridge has been retired.[2]

## Contents

* 1 Features
* 2 Functionality
* 3 Configuration
* 4 Allocation
* 5 See also
* 6 References
* 7 External links

## Features

OJB is an open source project. It is lightweight and easy to use, requiring simply configure two files to implement a persistence layer. It is easy to integrate into an existing application because it does not generate code. It allows the use of different patterns of persistence: owner (PersistenceBroker API), JDO and Object Data Management Group (ODMG).

## Functionality

OJB uses an XML based Object/Relational mapping. The mapping resides in a dynamic MetaData layer, which can be manipulated at runtime through a simple Meta-Object-Protocol (MOP) to change the behaviour of the persistence kernel.

## Configuration

At least two files are required to configure OJB: OJB.properties and 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

## References

1. ↑ "- Linux Today - Internetnews.com: Apache releases Object Relational Bridge". http://www.linuxtoday.com/developer/2005040602826NWSVDV.
2. ↑ Apache ObJectRelationalBridge (OJB), Apache Software Foundation.

## External links

* Apache ObJectRelationalBridge

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