JpaAccessor (Spring Framework API 2.0) - Spring Framework 2.0.5 API 文档英文版

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org.springframework.orm.jpa
Class JpaAccessor

java.lang.Object
  org.springframework.orm.jpa.EntityManagerFactoryAccessor
      org.springframework.orm.jpa.JpaAccessor

All Implemented Interfaces:: InitializingBean

Direct Known Subclasses:: JpaInterceptor, JpaTemplate

public abstract class JpaAccessor
extends EntityManagerFactoryAccessor
implements InitializingBean
extends EntityManagerFactoryAccessor
implements InitializingBean

Base class for JpaTemplate and JpaInterceptor, defining common properties such as EntityManagerFactory and flushing behavior.

Not intended to be used directly. See JpaTemplate and JpaInterceptor.

Since:: 2.0
Author:: Juergen Hoeller
See Also:: EntityManagerFactoryAccessor.setEntityManagerFactory(javax.persistence.EntityManagerFactory), setEntityManager(javax.persistence.EntityManager), setJpaDialect(org.springframework.orm.jpa.JpaDialect), setFlushEager(boolean), JpaTemplate, JpaInterceptor, JpaDialect

Field Summary

Fields inherited from class org.springframework.orm.jpa.EntityManagerFactoryAccessor

logger

Constructor Summary

JpaAccessor()


Method Summary

void afterPropertiesSet()
          Eagerly initialize the JPA dialect, creating a default one for the specified EntityManagerFactory if none set.

protected void flushIfNecessary(javax.persistence.EntityManager em, boolean existingTransaction)
          Flush the given JPA entity manager if necessary.

javax.persistence.EntityManager getEntityManager()
          Return the JPA EntityManager to use.

JpaDialect getJpaDialect()
          Return the JPA dialect to use for this accessor.

boolean isFlushEager()
          Return if this accessor should flush changes to the database eagerly.

void setEntityManager(javax.persistence.EntityManager entityManager)
          Set the JPA EntityManager to use.

void setFlushEager(boolean flushEager)
          Set if this accessor should flush changes to the database eagerly.

void setJpaDialect(JpaDialect jpaDialect)
          Set the JPA dialect to use for this accessor.

RuntimeException translateIfNecessary(RuntimeException ex)
          Convert the given runtime exception to an appropriate exception from the org.springframework.dao hierarchy if necessary, or return the exception itself if it is not persistence related Default implementation delegates to the JpaDialect.

Methods inherited from class org.springframework.orm.jpa.EntityManagerFactoryAccessor

createEntityManager, getEntityManagerFactory, getJpaPropertyMap, getTransactionalEntityManager, setEntityManagerFactory, setJpaProperties, setJpaPropertyMap

Methods inherited from class java.lang.Object

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

Fields inherited from class org.springframework.orm.jpa.EntityManagerFactoryAccessor
`logger`

Constructor Summary
`JpaAccessor()`

Method Summary
`void`	`afterPropertiesSet()` Eagerly initialize the JPA dialect, creating a default one for the specified EntityManagerFactory if none set.
`protected void`	`flushIfNecessary(javax.persistence.EntityManager em, boolean existingTransaction)` Flush the given JPA entity manager if necessary.
`javax.persistence.EntityManager`	`getEntityManager()` Return the JPA EntityManager to use.
`JpaDialect`	`getJpaDialect()` Return the JPA dialect to use for this accessor.
`boolean`	`isFlushEager()` Return if this accessor should flush changes to the database eagerly.
`void`	`setEntityManager(javax.persistence.EntityManager entityManager)` Set the JPA EntityManager to use.
`void`	`setFlushEager(boolean flushEager)` Set if this accessor should flush changes to the database eagerly.
`void`	`setJpaDialect(JpaDialect jpaDialect)` Set the JPA dialect to use for this accessor.
`RuntimeException`	`translateIfNecessary(RuntimeException ex)` Convert the given runtime exception to an appropriate exception from the `org.springframework.dao` hierarchy if necessary, or return the exception itself if it is not persistence related Default implementation delegates to the JpaDialect.

Methods inherited from class org.springframework.orm.jpa.EntityManagerFactoryAccessor
`createEntityManager, getEntityManagerFactory, getJpaPropertyMap, getTransactionalEntityManager, setEntityManagerFactory, setJpaProperties, setJpaPropertyMap`

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

Constructor Detail

JpaAccessor

public JpaAccessor()

Method Detail

setEntityManager

public void setEntityManager(javax.persistence.EntityManager entityManager)

Set the JPA EntityManager to use.

getEntityManager

public javax.persistence.EntityManager getEntityManager()

Return the JPA EntityManager to use.

setJpaDialect

public void setJpaDialect(JpaDialect jpaDialect)

Set the JPA dialect to use for this accessor.

The dialect object can be used to retrieve the underlying JDBC connection, for example.

getJpaDialect

public JpaDialect getJpaDialect()

Return the JPA dialect to use for this accessor.

Creates a default one for the specified EntityManagerFactory if none set.

setFlushEager

public void setFlushEager(boolean flushEager)

Set if this accessor should flush changes to the database eagerly.

Eager flushing leads to immediate synchronization with the database, even if in a transaction. This causes inconsistencies to show up and throw a respective exception immediately, and JDBC access code that participates in the same transaction will see the changes as the database is already aware of them then. But the drawbacks are:

additional communication roundtrips with the database, instead of a single batch at transaction commit;
the fact that an actual database rollback is needed if the JPA transaction rolls back (due to already submitted SQL statements).

isFlushEager

public boolean isFlushEager()

Return if this accessor should flush changes to the database eagerly.

afterPropertiesSet

public void afterPropertiesSet()

Eagerly initialize the JPA dialect, creating a default one for the specified EntityManagerFactory if none set.

Specified by:: afterPropertiesSet in interface InitializingBean

flushIfNecessary

protected void flushIfNecessary(javax.persistence.EntityManager em,
                                boolean existingTransaction)
                         throws javax.persistence.PersistenceException

Flush the given JPA entity manager if necessary.

Parameters:: em - the current JPA PersistenceManage; existingTransaction - if executing within an existing transaction
Throws:: javax.persistence.PersistenceException - in case of JPA flushing errors

translateIfNecessary

public RuntimeException translateIfNecessary(RuntimeException ex)

Convert the given runtime exception to an appropriate exception from the org.springframework.dao hierarchy if necessary, or return the exception itself if it is not persistence related

Default implementation delegates to the JpaDialect. May be overridden in subclasses.

Parameters:: ex - runtime exception that occured, which may or may not be JPA-related
Returns:: the corresponding DataAccessException instance if wrapping should occur, otherwise the raw exception
See Also:: DataAccessUtils.translateIfNecessary(java.lang.RuntimeException, org.springframework.dao.support.PersistenceExceptionTranslator)