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DefaultJpaDialect (Spring Framework API 2.1) - Spring Framework 2.1.0 API 文档英文版

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org.springframework.orm.jpa
Class DefaultJpaDialect

java.lang.Object
  org.springframework.orm.jpa.DefaultJpaDialect

All Implemented Interfaces:

PersistenceExceptionTranslator, JpaDialect

Direct Known Subclasses:

HibernateJpaDialect, OpenJpaDialect, TopLinkJpaDialect

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public class DefaultJpaDialect
extends Object
implements JpaDialect

Default implementation of the JpaDialect interface. Used as default dialect by JpaAccessor and JpaTransactionManager.

Simply begins a standard JPA transaction in beginTransaction and performs standard exception translation through EntityManagerFactoryUtils.

Since:

2.0

Author:

Juergen Hoeller

See Also:

JpaAccessor.setJpaDialect(org.springframework.orm.jpa.JpaDialect), JpaTransactionManager.setJpaDialect(org.springframework.orm.jpa.JpaDialect)

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Constructor Summary
DefaultJpaDialect()

 

Method Summary
Object	beginTransaction(javax.persistence.EntityManager entityManager, TransactionDefinition definition)           This implementation invokes the standard JPA Transaction.begin method.
void	cleanupTransaction(Object transactionData)           This implementation does nothing, since the default beginTransaction implementation does not require any cleanup.
EntityManagerFactoryPlusOperations	getEntityManagerFactoryPlusOperations(javax.persistence.EntityManagerFactory rawEntityManager)           Return an EntityManagerFactoryPlusOperations implementation for the given raw EntityManagerFactory.
EntityManagerPlusOperations	getEntityManagerPlusOperations(javax.persistence.EntityManager rawEntityManager)           Return an EntityManagerPlusOperations implementation for the given raw EntityManager.
ConnectionHandle	getJdbcConnection(javax.persistence.EntityManager entityManager, boolean readOnly)           This implementation always returns null, indicating that no JDBC Connection can be provided.
void	releaseJdbcConnection(ConnectionHandle conHandle, javax.persistence.EntityManager em)           This implementation does nothing, assuming that the Connection will implicitly be closed with the EntityManager.
boolean	supportsEntityManagerFactoryPlusOperations()           Return whether the EntityManagerFactoryPlus(Operations) interface is supported by this provider.
boolean	supportsEntityManagerPlusOperations()           Return whether the EntityManagerPlus(Operations) interface is supported by this provider.
DataAccessException	translateExceptionIfPossible(RuntimeException ex)           This implementation delegates to EntityManagerFactoryUtils.

 

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Constructor Detail

DefaultJpaDialect

public DefaultJpaDialect()

Method Detail

beginTransaction

public Object beginTransaction(javax.persistence.EntityManager entityManager,
                               TransactionDefinition definition)
                        throws javax.persistence.PersistenceException,
                               SQLException,
                               TransactionException

This implementation invokes the standard JPA Transaction.begin method. Throws an InvalidIsolationLevelException if a non-default isolation level is set.

This implementation does not return any transaction data Object, since there is no state to be kept for a standard JPA transaction. Hence, subclasses do not have to care about the return value (null) of this implementation and are free to return their own transaction data Object.

Specified by:

beginTransaction in interface JpaDialect

Parameters:

entityManager - the EntityManager to begin a JPA transaction on

definition - the Spring transaction definition that defines semantics

Returns:

an arbitrary object that holds transaction data, if any (to be passed into cleanupTransaction)

Throws:

javax.persistence.PersistenceException - if thrown by JPA methods

SQLException - if thrown by JDBC methods

TransactionException - in case of invalid arguments

See Also:

EntityTransaction.begin(), InvalidIsolationLevelException, cleanupTransaction(java.lang.Object)

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cleanupTransaction

public void cleanupTransaction(Object transactionData)

This implementation does nothing, since the default beginTransaction implementation does not require any cleanup.

Specified by:

cleanupTransaction in interface JpaDialect

Parameters:

transactionData - arbitrary object that holds transaction data, if any (as returned by beginTransaction)

See Also:

beginTransaction(javax.persistence.EntityManager, org.springframework.transaction.TransactionDefinition)

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getJdbcConnection

public ConnectionHandle getJdbcConnection(javax.persistence.EntityManager entityManager,
                                          boolean readOnly)
                                   throws javax.persistence.PersistenceException,
                                          SQLException

This implementation always returns null, indicating that no JDBC Connection can be provided.

Specified by:

getJdbcConnection in interface JpaDialect

Parameters:

entityManager - the current JPA EntityManager

Returns:

a handle for the JDBC Connection, to be passed into releaseJdbcConnection, or null if no JDBC Connection can be retrieved

Throws:

javax.persistence.PersistenceException - if thrown by JPA methods

SQLException - if thrown by JDBC methods

See Also:

JpaDialect.releaseJdbcConnection(org.springframework.jdbc.datasource.ConnectionHandle, javax.persistence.EntityManager), ConnectionHandle.getConnection(), SimpleConnectionHandle, JpaTransactionManager.setDataSource(javax.sql.DataSource), NativeJdbcExtractor

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releaseJdbcConnection

public void releaseJdbcConnection(ConnectionHandle conHandle,
                                  javax.persistence.EntityManager em)
                           throws javax.persistence.PersistenceException,
                                  SQLException

This implementation does nothing, assuming that the Connection will implicitly be closed with the EntityManager.

If the JPA implementation returns a Connection handle that it expects the application to close after use, the dialect implementation needs to invoke Connection.close() (or some other method with similar effect) here.

Specified by:

releaseJdbcConnection in interface JpaDialect

Parameters:

conHandle - the JDBC Connection handle to release

em - the current JPA EntityManager

Throws:

javax.persistence.PersistenceException - if thrown by JPA methods

SQLException - if thrown by JDBC methods

See Also:

Connection.close()

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translateExceptionIfPossible

public DataAccessException translateExceptionIfPossible(RuntimeException ex)

This implementation delegates to EntityManagerFactoryUtils.

Specified by:

translateExceptionIfPossible in interface PersistenceExceptionTranslator

Parameters:

ex - a RuntimeException thrown

Returns:

the corresponding DataAccessException (or null if the exception could not be translated, as in this case it may result from user code rather than an actual persistence problem)

See Also:

EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(java.lang.RuntimeException)

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supportsEntityManagerFactoryPlusOperations

public boolean supportsEntityManagerFactoryPlusOperations()

Description copied from interface: JpaDialect

Return whether the EntityManagerFactoryPlus(Operations) interface is supported by this provider.

Specified by:

supportsEntityManagerFactoryPlusOperations in interface JpaDialect

See Also:

EntityManagerFactoryPlusOperations, EntityManagerFactoryPlus

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supportsEntityManagerPlusOperations

public boolean supportsEntityManagerPlusOperations()

Description copied from interface: JpaDialect

Return whether the EntityManagerPlus(Operations) interface is supported by this provider.

Specified by:

supportsEntityManagerPlusOperations in interface JpaDialect

See Also:

EntityManagerPlusOperations, EntityManagerPlus

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getEntityManagerFactoryPlusOperations

public EntityManagerFactoryPlusOperations getEntityManagerFactoryPlusOperations(javax.persistence.EntityManagerFactory rawEntityManager)

Description copied from interface: JpaDialect

Return an EntityManagerFactoryPlusOperations implementation for the given raw EntityManagerFactory. This operations object can be used to serve the additional operations behind a proxy that implements the EntityManagerFactoryPlus interface.

Specified by:

getEntityManagerFactoryPlusOperations in interface JpaDialect

Parameters:

rawEntityManager - the raw provider-specific EntityManagerFactory

Returns:

the EntityManagerFactoryPlusOperations implementation

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getEntityManagerPlusOperations

public EntityManagerPlusOperations getEntityManagerPlusOperations(javax.persistence.EntityManager rawEntityManager)

Description copied from interface: JpaDialect

Return an EntityManagerPlusOperations implementation for the given raw EntityManager. This operations object can be used to serve the additional operations behind a proxy that implements the EntityManagerPlus interface.

Specified by:

getEntityManagerPlusOperations in interface JpaDialect

Parameters:

rawEntityManager - the raw provider-specific EntityManagerFactory

Returns:

the EntityManagerFactoryPlusOperations implementation

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