Persistence Unit Introduction

What Is The Persistence Unit?

• Persistence Unit: Defines a complete Object-Relational Model mapping (ORM) (entities + supporting structures) with a relational database. The EntityManagerFactory uses this data to create a EntityManager that is associated with a Persistence Context.
• Apersistence unit specifies all entities, which are managed by the EntityManagers of the application. Each persistence unit contains all entities classes representing the data stored in a single database.

See Also

• Object Relational Mapping
• EntityManagerFactory
• EntityManager
• Persistence Context