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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

    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`

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)`

### 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)`

### 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)`

### 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)`

### 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)`

### getJpaTemplate

    public final JpaTemplate getJpaTemplate()

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

### 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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