类 EclipseLinkJpaDialect

构造器详细资料

• EclipseLinkJpaDialect

  public EclipseLinkJpaDialect()

方法详细资料

• setLazyDatabaseTransaction

  public void setLazyDatabaseTransaction​(boolean lazyDatabaseTransaction)

  Set whether to lazily start a database resource transaction within a Spring-managed EclipseLink transaction.

  By default, read-only transactions are started lazily but regular non-read-only transactions are started early. This allows for reusing the same JDBC Connection throughout an entire EclipseLink transaction, for enforced isolation and consistent visibility with JDBC access code working on the same DataSource.

  Switch this flag to "true" to enforce a lazy database transaction begin even for non-read-only transactions, allowing access to EclipseLink's shared cache and following EclipseLink's connection mode configuration, assuming that isolation and visibility at the JDBC level are less important.

  另请参阅:

  UnitOfWork.beginEarlyTransaction()

• 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)

• 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