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 Summary

Fields

Modifier and Type	Field and Description
static String	PERSISTENCE_PROVIDER Deprecated.
protected static Set<PersistenceProvider>	providers Deprecated.

Constructor Summary

Constructors

Constructor and Description
Persistence()

Method Summary

Modifier and Type	Method and Description
static EntityManagerFactory	createEntityManagerFactory(String persistenceUnitName) Create and return an EntityManagerFactory for the named persistence unit.
static EntityManagerFactory	createEntityManagerFactory(String persistenceUnitName, Map properties) Create and return an EntityManagerFactory for the named persistence unit using the given properties.
static void	generateSchema(String persistenceUnitName, 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 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 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(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