Apache OJB
| Developer(s) | Apache Software Foundation |
|---|---|
| Stable release | 1.0.4
/ December 31, 2005 |
| 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.[1]
Features
- OJB is open source (open source code).
- Is also lightweight and easy to use, because to implement a persistence layer, one must simply configure two files (see section below)
- Easy to integrate into an existing application because it does not generate code.
- 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.
References
See also
External links
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