Package javax.persistence

Class Persistence

java.lang.Object
javax.persistence.Persistence
public class Persistence extends Object
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:
Java Persistence 1.0

  • Field Details

    • PERSISTENCE_PROVIDER

      @Deprecated public static final String PERSISTENCE_PROVIDER
      Deprecated.
      This final String is deprecated and should be removed and is only here for TCK backward compatibility
      Since:
      Java Persistence 1.0
      See Also:

    • providers

      @Deprecated protected static final Set<PersistenceProvider> providers
      Deprecated.
      This instance variable is deprecated and should be removed and is only here for TCK backward compatibility
      Since:
      Java Persistence 1.0

  • Constructor Details

    • Persistence

      public Persistence()

  • Method Details

    • createEntityManagerFactory

      public static EntityManagerFactory createEntityManagerFactory(String persistenceUnitName)
      Create and return an EntityManagerFactory for the named persistence unit.
      Parameters:
      persistenceUnitName - the name of the persistence unit
      Returns:
      the factory that creates EntityManagers configured according to the specified persistence unit

    • createEntityManagerFactory

      public static 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.
      Returns:
      the factory that creates EntityManagers configured according to the specified persistence unit.

    • generateSchema

      public static 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:
      Java Persistence 2.1

    • getPersistenceUtil

      public static PersistenceUtil getPersistenceUtil()
      Return the PersistenceUtil instance
      Returns:
      PersistenceUtil instance
      Since:
      Java Persistence 2.0