JPA and TopLink
The Java Persistence API (JPA) is a Java specification for persisting and managing data between Java objects and classes, and a relational database. JPA is part of the EJB 3.0 specification, is intended to replace the EJB 2 CMP entity bean specification, and is a current industry standard for object-relational mapping (ORM). You can choose from open source and commercial JPA implementations, and a Java EE 5 application server such as Oracle WebLogic Server supports the use of JPA.
Unlike the EJB 2 CMP specification, JPA allows you to define object-relational mappings through standard annotations or XML. JPA includes the object-level query language JPQL to allow the querying of objects from a relational database. It also defines ...
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