Package javax.persistence

Class Persistence


  • public class Persistence
extends java.lang.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

    • Constructor Summary

      Constructors 
      Constructor Description
      Persistence​()  

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static EntityManagerFactory createEntityManagerFactory​(java.lang.String persistenceUnitName)
      Create and return an EntityManagerFactory for the named persistence unit.
      static EntityManagerFactory createEntityManagerFactory​(java.lang.String persistenceUnitName, java.util.Map properties)
      Create and return an EntityManagerFactory for the named persistence unit using the given properties.
      static void generateSchema​(java.lang.String persistenceUnitName, java.util.Map map)
      Create database schemas and/or tables and/or create DDL scripts as determined by the supplied properties.
      static PersistenceUtil getPersistenceUtil​()
      Return the PersistenceUtil instance

      • Methods inherited from class java.lang.Object

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

    • Field Detail

      • PERSISTENCE_PROVIDER

        @Deprecated
public static final java.lang.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:
        Constant Field Values

      • providers

        @Deprecated
protected static final java.util.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 Detail

      • Persistence

        public Persistence​()

    • Method Detail

      • createEntityManagerFactory

        public static EntityManagerFactory createEntityManagerFactory​(java.lang.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​(java.lang.String persistenceUnitName,
                                                              java.util.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​(java.lang.String persistenceUnitName,
                                  java.util.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