JPA - Object-Relational Mapping (ORM)

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JPA standardizes the important task of object-relational mapping by using:

to map objects into one or more tables of a database.

The JPA specification explicitly defines the object-relational mapping, rather than relying on vendor-specific mapping implementations.

The mapping metadata are an union of:


  • top-down: Generating database tables from entity beans

Documentation / Reference

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A simple JPA implementation that insert an “Hello World” string in a HELLO table in a relational database. This example uses the JPA reference implementation: against an Oracle Database. Maven...
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JPA - Java Persistence API (JPA)

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JPA - Persistence Unit

the node provider property See chapter 8.1 of the specification
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JPA - orm.xml (Mapping Descriptor files)

orm.xml is a deployment descriptors describing the object-relational mapping. The Xsd Schema file can be found: orm_2_0.xsd or in the specification...

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