类 HibernateJpaDialect

构造器详细资料

• HibernateJpaDialect

  public HibernateJpaDialect()

方法详细资料

• setPrepareConnection

  public void setPrepareConnection​(boolean prepareConnection)

  Set whether to prepare the underlying JDBC Connection of a transactional Hibernate Session, that is, whether to apply a transaction-specific isolation level and/or the transaction's read-only flag to the underlying JDBC Connection.

  Default is "true" on Hibernate EntityManager 4.x (with its 'on-close' connection release mode, and "false" on Hibernate EntityManager 3.6 (due to the 'after-transaction' release mode there). Note that Hibernate 4.2+ is strongly recommended in order to make isolation levels work efficiently.

  If you turn this flag off, JPA transaction management will not support per-transaction isolation levels anymore. It will not call Connection.setReadOnly(true) for read-only transactions anymore either. If this flag is turned off, no cleanup of a JDBC Connection is required after a transaction, since no Connection settings will get modified.

  NOTE: The default behavior in terms of read-only handling changed in Spring 4.1, propagating the read-only status to the JDBC Connection now, analogous to other Spring transaction managers. This may have the effect that you're running into read-only enforcement now where previously write access has accidentally been tolerated: Please revise your transaction declarations accordingly, removing invalid read-only markers if necessary.

  从以下版本开始:

  4.1

  另请参阅:

  Connection.setTransactionIsolation(int), Connection.setReadOnly(boolean)

• beginTransaction

  public Object beginTransaction​(EntityManager entityManager,
                                 TransactionDefinition definition)
                          throws PersistenceException,
                                 SQLException,
                                 TransactionException

  从类复制的说明: 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.

  指定者:

  beginTransaction 在接口中 JpaDialect

  覆盖:

  beginTransaction 在类中 DefaultJpaDialect

  参数:

  entityManager - the EntityManager to begin a JPA transaction on

  definition - the Spring transaction definition that defines semantics

  返回:

  an arbitrary object that holds transaction data, if any (to be passed into JpaDialect.cleanupTransaction(java.lang.Object)). May implement the SavepointManager interface.

  抛出:

  PersistenceException - if thrown by JPA methods

  SQLException - if thrown by JDBC methods

  TransactionException - in case of invalid arguments

  另请参阅:

  EntityTransaction.begin(), InvalidIsolationLevelException, DefaultJpaDialect.cleanupTransaction(java.lang.Object)

• prepareTransaction

  public Object prepareTransaction​(EntityManager entityManager,
                                   boolean readOnly,
                                   String name)
                            throws PersistenceException

  从接口复制的说明: JpaDialect
  Prepare a JPA transaction, applying the specified semantics. Called by EntityManagerFactoryUtils when enlisting an EntityManager in a JTA transaction or a locally joined transaction (e.g. after upgrading an unsynchronized EntityManager to a synchronized one).

  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 to optimize for specific data access use cases (effectively using the current transaction name as use case identifier).

  指定者:

  prepareTransaction 在接口中 JpaDialect

  覆盖:

  prepareTransaction 在类中 DefaultJpaDialect

  参数:

  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)

  返回:

  an arbitrary object that holds transaction data, if any (to be passed into cleanupTransaction)

  抛出:

  PersistenceException - if thrown by JPA methods

  另请参阅:

  JpaDialect.cleanupTransaction(java.lang.Object)

• prepareFlushMode

  protected FlushMode prepareFlushMode​(Session session,
                                       boolean readOnly)
                                throws PersistenceException

  抛出:

  PersistenceException

• cleanupTransaction

  public void cleanupTransaction​(Object transactionData)

  从类复制的说明: DefaultJpaDialect
  This implementation does nothing, since the default beginTransaction implementation does not require any cleanup.

  指定者:

  cleanupTransaction 在接口中 JpaDialect

  覆盖:

  cleanupTransaction 在类中 DefaultJpaDialect

  参数:

  transactionData - arbitrary object that holds transaction data, if any (as returned by beginTransaction or prepareTransaction)

  另请参阅:

  DefaultJpaDialect.beginTransaction(javax.persistence.EntityManager, org.springframework.transaction.TransactionDefinition)

• getJdbcConnection

  public ConnectionHandle getJdbcConnection​(EntityManager entityManager,
                                            boolean readOnly)
                                     throws PersistenceException,
                                            SQLException

  从类复制的说明: DefaultJpaDialect
  This implementation always returns null, indicating that no JDBC Connection can be provided.

  指定者:

  getJdbcConnection 在接口中 JpaDialect

  覆盖:

  getJdbcConnection 在类中 DefaultJpaDialect

  参数:

  entityManager - the current JPA EntityManager

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

  返回:

  a handle for the Connection, to be passed into releaseJdbcConnection, or null if no JDBC Connection can be retrieved

  抛出:

  PersistenceException - if thrown by JPA methods

  SQLException - if thrown by JDBC methods

  另请参阅:

  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)

  从类复制的说明: DefaultJpaDialect
  This implementation delegates to EntityManagerFactoryUtils.

  指定者:

  translateExceptionIfPossible 在接口中 PersistenceExceptionTranslator

  覆盖:

  translateExceptionIfPossible 在类中 DefaultJpaDialect

  参数:

  ex - a RuntimeException to translate

  返回:

  the corresponding DataAccessException (or null if the exception could not be translated, as in this case it may result from user code rather than from an actual persistence problem)

  另请参阅:

  EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(java.lang.RuntimeException)

• convertHibernateAccessException

  protected DataAccessException convertHibernateAccessException​(HibernateException ex)

  Convert the given HibernateException to an appropriate exception from the org.springframework.dao hierarchy.

  参数:

  ex - HibernateException that occurred

  返回:

  the corresponding DataAccessException instance

• getSession

  protected Session getSession​(EntityManager entityManager)