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

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org.springframework.orm.jpa.vendor
Class OpenJpaDialect

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

All Implemented Interfaces:

PersistenceExceptionTranslator, JpaDialect

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public class OpenJpaDialect
extends DefaultJpaDialect

JpaDialect implementation for Apache OpenJPA. Developed and tested against OpenJPA 0.9.6.

Since:

2.0

Author:

Costin Leau

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Constructor Summary
OpenJpaDialect()

 

Method Summary
Object	beginTransaction(javax.persistence.EntityManager entityManager, TransactionDefinition definition)           This implementation invokes the standard JPA Transaction.begin method.
ConnectionHandle	getJdbcConnection(javax.persistence.EntityManager entityManager, boolean readOnly)           This implementation always returns null, indicating that no JDBC Connection can be provided.
protected  org.apache.openjpa.persistence.OpenJPAEntityManager	getOpenJPAEntityManager(javax.persistence.EntityManager em)           Return the OpenJPA-specific interface of EntityManager.
void	releaseJdbcConnection(ConnectionHandle conHandle, javax.persistence.EntityManager em)           This implementation does nothing, assuming that the Connection will implicitly be closed with the EntityManager.

 

Methods inherited from class org.springframework.orm.jpa.DefaultJpaDialect
cleanupTransaction, getEntityManagerFactoryPlusOperations, getEntityManagerPlusOperations, supportsEntityManagerFactoryPlusOperations, supportsEntityManagerPlusOperations, translateExceptionIfPossible

 

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

 

Constructor Detail

OpenJpaDialect

public OpenJpaDialect()

Method Detail

getJdbcConnection

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

Description copied from class: DefaultJpaDialect

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

Specified by:

getJdbcConnection in interface JpaDialect

Overrides:

getJdbcConnection in class DefaultJpaDialect

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

Description copied from class: DefaultJpaDialect

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

Overrides:

releaseJdbcConnection in class DefaultJpaDialect

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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beginTransaction

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

Description copied from class: DefaultJpaDialect

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

Overrides:

beginTransaction in class DefaultJpaDialect

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, DefaultJpaDialect.cleanupTransaction(java.lang.Object)

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getOpenJPAEntityManager

protected org.apache.openjpa.persistence.OpenJPAEntityManager getOpenJPAEntityManager(javax.persistence.EntityManager em)

Return the OpenJPA-specific interface of EntityManager.

Parameters:

em - the generic EntityManager instance

Returns:

the OpenJPA-specific interface of EntityManager

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