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

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org.springframework.orm.jpa.support
Class JpaDaoSupport

java.lang.Object
  org.springframework.dao.support.DaoSupport
      org.springframework.orm.jpa.support.JpaDaoSupport

All Implemented Interfaces:

InitializingBean

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public abstract class JpaDaoSupport
extends DaoSupport

Convenient super class for JPA data access objects. Intended for JpaTemplate usage. Alternatively, JPA-based DAOs can be coded against the plain JPA EntityManagerFactory/EntityManager API.

Requires an EntityManagerFactory or EntityManager to be set, providing a JpaTemplate based on it to subclasses. Can alternatively be initialized directly via a JpaTemplate, to reuse the latter's settings such as the EntityManagerFactory, JpaDialect, flush mode, etc.

This class will create its own JpaTemplate if an EntityManagerFactory or EntityManager reference is passed in. A custom JpaTemplate instance can be used through overriding createJpaTemplate.

Since:

2.0

Author:

Juergen Hoeller

See Also:

setEntityManagerFactory(javax.persistence.EntityManagerFactory), setEntityManager(javax.persistence.EntityManager), createJpaTemplate(javax.persistence.EntityManagerFactory), setJpaTemplate(org.springframework.orm.jpa.JpaTemplate), JpaTemplate

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Field Summary

 

Fields inherited from class org.springframework.dao.support.DaoSupport
logger

 

Constructor Summary
JpaDaoSupport()

 

Method Summary
protected  void	checkDaoConfig()           Abstract subclasses must override this to check their configuration.
protected  JpaTemplate	createJpaTemplate(javax.persistence.EntityManager entityManager)           Create a JpaTemplate for the given EntityManager.
protected  JpaTemplate	createJpaTemplate(javax.persistence.EntityManagerFactory entityManagerFactory)           Create a JpaTemplate for the given EntityManagerFactory.
JpaTemplate	getJpaTemplate()           Return the JpaTemplate for this DAO, pre-initialized with the EntityManagerFactory or set explicitly.
void	setEntityManager(javax.persistence.EntityManager entityManager)           Set the JPA EntityManager to be used by this DAO.
void	setEntityManagerFactory(javax.persistence.EntityManagerFactory entityManagerFactory)           Set the JPA EntityManagerFactory to be used by this DAO.
void	setJpaTemplate(JpaTemplate jpaTemplate)           Set the JpaTemplate for this DAO explicitly, as an alternative to specifying a EntityManagerFactory.

 

Methods inherited from class org.springframework.dao.support.DaoSupport
afterPropertiesSet, initDao

 

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

 

Constructor Detail

JpaDaoSupport

public JpaDaoSupport()

Method Detail

setEntityManagerFactory

public final void setEntityManagerFactory(javax.persistence.EntityManagerFactory entityManagerFactory)

Set the JPA EntityManagerFactory to be used by this DAO. Will automatically create a JpaTemplate for the given EntityManagerFactory.

See Also:

createJpaTemplate(javax.persistence.EntityManagerFactory), setJpaTemplate(org.springframework.orm.jpa.JpaTemplate)

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createJpaTemplate

protected JpaTemplate createJpaTemplate(javax.persistence.EntityManagerFactory entityManagerFactory)

Create a JpaTemplate for the given EntityManagerFactory. Only invoked if populating the DAO with a EntityManagerFactory reference!

Can be overridden in subclasses to provide a JpaTemplate instance with different configuration, or a custom JpaTemplate subclass.

Parameters:

entityManagerFactory - the JPA EntityManagerFactory to create a JpaTemplate for

Returns:

the new JpaTemplate instance

See Also:

setEntityManagerFactory(javax.persistence.EntityManagerFactory)

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setEntityManager

public final void setEntityManager(javax.persistence.EntityManager entityManager)

Set the JPA EntityManager to be used by this DAO. Will automatically create a JpaTemplate for the given EntityManager.

See Also:

createJpaTemplate(javax.persistence.EntityManagerFactory), setJpaTemplate(org.springframework.orm.jpa.JpaTemplate)

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createJpaTemplate

protected JpaTemplate createJpaTemplate(javax.persistence.EntityManager entityManager)

Create a JpaTemplate for the given EntityManager. Only invoked if populating the DAO with a EntityManager reference!

Can be overridden in subclasses to provide a JpaTemplate instance with different configuration, or a custom JpaTemplate subclass.

Parameters:

entityManager - the JPA EntityManager to create a JpaTemplate for

Returns:

the new JpaTemplate instance

See Also:

setEntityManagerFactory(javax.persistence.EntityManagerFactory)

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setJpaTemplate

public final void setJpaTemplate(JpaTemplate jpaTemplate)

Set the JpaTemplate for this DAO explicitly, as an alternative to specifying a EntityManagerFactory.

See Also:

setEntityManagerFactory(javax.persistence.EntityManagerFactory)

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getJpaTemplate

public final JpaTemplate getJpaTemplate()

Return the JpaTemplate for this DAO, pre-initialized with the EntityManagerFactory or set explicitly.

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checkDaoConfig

protected final void checkDaoConfig()

Description copied from class: DaoSupport

Abstract subclasses must override this to check their configuration.

Implementors should be marked as final

Specified by:

checkDaoConfig in class DaoSupport

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