## org.springframework.orm.jpa.vendor
Class HibernateJpaDialect

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

All Implemented Interfaces:
  Serializable, PersistenceExceptionTranslator, JpaDialect

    public class HibernateJpaDialect

extends DefaultJpaDialect

`JpaDialect` implementation for Hibernate EntityManager. Developed and tested against Hibernate 3.2.

Since:
  2.0
Author:
  Costin Leau, Juergen Hoeller
See Also:
  Serialized Form

Constructor Summary
`HibernateJpaDialect()`

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.
`ConnectionHandle` `getJdbcConnection(javax.persistence.EntityManager entityManager, boolean readOnly)` This implementation always returns `null`, indicating that no JDBC Connection can be provided.
`protected org.hibernate.Session` `getSession(javax.persistence.EntityManager em)`
`Object` `prepareTransaction(javax.persistence.EntityManager entityManager, boolean readOnly, String name)` Prepare a JPA transaction, applying the specified semantics.
`DataAccessException` `translateExceptionIfPossible(RuntimeException ex)` This implementation delegates to EntityManagerFactoryUtils.

Methods inherited from class org.springframework.orm.jpa.DefaultJpaDialect
`getEntityManagerFactoryPlusOperations, getEntityManagerPlusOperations, releaseJdbcConnection, supportsEntityManagerFactoryPlusOperations, supportsEntityManagerPlusOperations`

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

Constructor Detail

### HibernateJpaDialect

    public HibernateJpaDialect()

Method Detail

### 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 `JpaDialect.cleanupTransaction(java.lang.Object)`). May implement the `SavepointManager` interface.
  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)`

### prepareTransaction

    public Object prepareTransaction(javax.persistence.EntityManager entityManager,
                                     boolean readOnly,
                                     String name)
                              throws javax.persistence.PersistenceException

  Description copied from interface: `JpaDialect`
  Prepare a JPA transaction, applying the specified semantics. Called by EntityManagerFactoryUtils when enlisting an EntityManager in a JTA transaction.

  An implementation can apply the read-only flag as flush mode. In that case, a transaction data object can be returned that holds the previous flush mode (and possibly other data), to be reset in `cleanupTransaction`.

  Implementations can also use the Spring transaction name, as exposed by the passed-in TransactionDefinition, to optimize for specific data access use cases (effectively using the current transaction name as use case identifier).

  Specified by:
    `prepareTransaction` in interface `JpaDialect`
  Overrides:
    `prepareTransaction` in class `DefaultJpaDialect`
  Parameters:
    `entityManager` - the EntityManager to begin a JPA transaction on
    `readOnly` - whether the transaction is supposed to be read-only
    `name` - the name of the transaction (if any)
  Returns:
    an arbitrary object that holds transaction data, if any (to be passed into cleanupTransaction)
  Throws:
    `javax.persistence.PersistenceException` - if thrown by JPA methods
  See Also:
    `JpaDialect.cleanupTransaction(java.lang.Object)`

### cleanupTransaction

    public void cleanupTransaction(Object transactionData)

  Description copied from class: `DefaultJpaDialect`
  This implementation does nothing, since the default `beginTransaction` implementation does not require any cleanup.

  Specified by:
    `cleanupTransaction` in interface `JpaDialect`
  Overrides:
    `cleanupTransaction` in class `DefaultJpaDialect`
  Parameters:
    `transactionData` - arbitrary object that holds transaction data, if any (as returned by beginTransaction or prepareTransaction)
  See Also:
    `DefaultJpaDialect.beginTransaction(javax.persistence.EntityManager, org.springframework.transaction.TransactionDefinition)`

### 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
    `readOnly` - whether the Connection is only needed for read-only purposes
  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`

### translateExceptionIfPossible

    public DataAccessException translateExceptionIfPossible(RuntimeException ex)

  Description copied from class: `DefaultJpaDialect`
  This implementation delegates to EntityManagerFactoryUtils.

  Specified by:
    `translateExceptionIfPossible` in interface `PersistenceExceptionTranslator`
  Overrides:
    `translateExceptionIfPossible` in class `DefaultJpaDialect`
  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)`

### getSession

    protected org.hibernate.Session getSession(javax.persistence.EntityManager em)

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