JPA Class

Persistence

java.lang.Object
  ∟ javax.persistence.Persistence
Bootstrap class that is used to obtain an EntityManagerFactory in Java SE environments. It may also be used to cause schema generation to occur.

The Persistence class is available in a Java EE container environment as well; however, support for the Java SE bootstrapping APIs is not required in container environments.

The Persistence class is used to obtain a PersistenceUtil instance in both Java EE and Java SE environments.

Since:
JPA 1.0
The Database Connection using JPA article explains how to use Persistence.

Public Static Methods

EntityManagerFactory createEntityManagerFactory(String persistenceUnitName)
Create and return an EntityManagerFactory for the named persistence unit.
Parameters:
persistenceUnitName the - name of the persistence unit
Return:
the factory that creates EntityManagers configured according to the specified persistence unit
Since:
JPA 1.0
EntityManagerFactory createEntityManagerFactory(String persistenceUnitName, Map properties)
Create and return an EntityManagerFactory for the named persistence unit using the given properties.
Parameters:
persistenceUnitName the - name of the persistence unit
properties Additional - properties to use when creating the factory. These properties may include properties to control schema generation. The values of these properties override any values that may have been configured elsewhere.
Return:
the factory that creates EntityManagers configured according to the specified persistence unit.
Since:
JPA 1.0
void generateSchema(String persistenceUnitName, Map map)
Create database schemas and/or tables and/or create DDL scripts as determined by the supplied properties.

Called when schema generation is to occur as a separate phase from creation of the entity manager factory.

Parameters:
persistenceUnitName - the name of the persistence unit
map - properties for schema generation; these may also contain provider-specific properties. The value of these properties override any values that may have been configured elsewhere..
Throws:
PersistenceException - if insufficient or inconsistent configuration information is provided or if schema generation otherwise fails.
Since:
JPA 2.1
PersistenceUtil getPersistenceUtil()
Return the PersistenceUtil instance
Return:
PersistenceUtil instance
Since:
JPA 2.0

Method inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait