类 ConnectionHolder

字段详细资料

• SAVEPOINT_NAME_PREFIX

  public static final String SAVEPOINT_NAME_PREFIX

  另请参阅:

  常量字段值

构造器详细资料

• ConnectionHolder

  public ConnectionHolder​(ConnectionHandle connectionHandle)

  Create a new ConnectionHolder for the given ConnectionHandle.

  参数:

  connectionHandle - the ConnectionHandle to hold

• ConnectionHolder

  public ConnectionHolder​(Connection connection)

  Create a new ConnectionHolder for the given JDBC Connection, wrapping it with a SimpleConnectionHandle, assuming that there is no ongoing transaction.

  参数:

  connection - the JDBC Connection to hold

  另请参阅:

  SimpleConnectionHandle, ConnectionHolder(java.sql.Connection, boolean)

• ConnectionHolder

  public ConnectionHolder​(Connection connection,
                          boolean transactionActive)

  Create a new ConnectionHolder for the given JDBC Connection, wrapping it with a SimpleConnectionHandle.

  参数:

  connection - the JDBC Connection to hold

  transactionActive - whether the given Connection is involved in an ongoing transaction

  另请参阅:

  SimpleConnectionHandle

方法详细资料

• getConnectionHandle

  public ConnectionHandle getConnectionHandle()

  Return the ConnectionHandle held by this ConnectionHolder.

• hasConnection

  protected boolean hasConnection()

  Return whether this holder currently has a Connection.

• setTransactionActive

  protected void setTransactionActive​(boolean transactionActive)

  Set whether this holder represents an active, JDBC-managed transaction.

  另请参阅:

  DataSourceTransactionManager

• isTransactionActive

  protected boolean isTransactionActive()

  Return whether this holder represents an active, JDBC-managed transaction.

• setConnection

  protected void setConnection​(Connection connection)

  Override the existing Connection handle with the given Connection. Reset the handle if given null.

  Used for releasing the Connection on suspend (with a null argument) and setting a fresh Connection on resume.

• getConnection

  public Connection getConnection()

  Return the current Connection held by this ConnectionHolder.

  This will be the same Connection until released gets called on the ConnectionHolder, which will reset the held Connection, fetching a new Connection on demand.

  另请参阅:

  ConnectionHandle.getConnection(), released()

• supportsSavepoints

  public boolean supportsSavepoints()
                             throws SQLException

  Return whether JDBC 3.0 Savepoints are supported. Caches the flag for the lifetime of this ConnectionHolder.

  抛出:

  SQLException - if thrown by the JDBC driver

• createSavepoint

  public Savepoint createSavepoint()
                            throws SQLException

  Create a new JDBC 3.0 Savepoint for the current Connection, using generated savepoint names that are unique for the Connection.

  返回:

  the new Savepoint

  抛出:

  SQLException - if thrown by the JDBC driver

• released

  public void released()

  Releases the current Connection held by this ConnectionHolder.

  This is necessary for ConnectionHandles that expect "Connection borrowing", where each returned Connection is only temporarily leased and needs to be returned once the data operation is done, to make the Connection available for other operations within the same transaction. This is the case with JDO 2.0 DataStoreConnections, for example.

  覆盖:

  released 在类中 ResourceHolderSupport

  另请参阅:

  DefaultJdoDialect.getJdbcConnection(javax.jdo.PersistenceManager, boolean)

• clear

  public void clear()

  从类复制的说明: ResourceHolderSupport
  Clear the transactional state of this resource holder.

  覆盖:

  clear 在类中 ResourceHolderSupport