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ConnectionHolder (Spring Framework API 2.0) - Spring Framework 2.0.5 API 文档英文版

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org.springframework.jdbc.datasource
Class ConnectionHolder

java.lang.Object
  org.springframework.transaction.support.ResourceHolderSupport
      org.springframework.jdbc.datasource.ConnectionHolder

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public class ConnectionHolder
extends ResourceHolderSupport

Connection holder, wrapping a JDBC Connection. DataSourceTransactionManager binds instances of this class to the thread, for a specific DataSource.

Inherits rollback-only support for nested JDBC transactions and reference count functionality from the base class.

Note: This is an SPI class, not intended to be used by applications.

Since:

06.05.2003

Author:

Juergen Hoeller

See Also:

DataSourceTransactionManager, DataSourceUtils

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Field Summary
static String	SAVEPOINT_NAME_PREFIX

 

Constructor Summary
ConnectionHolder(Connection connection)           Create a new ConnectionHolder for the given JDBC Connection, wrapping it with a SimpleConnectionHandle, assuming that there is no ongoing transaction.
ConnectionHolder(Connection connection, boolean transactionActive)           Create a new ConnectionHolder for the given JDBC Connection, wrapping it with a SimpleConnectionHandle.
ConnectionHolder(ConnectionHandle connectionHandle)           Create a new ConnectionHolder for the given ConnectionHandle.

 

Method Summary
void	clear()           Clear the transactional state of this resource holder.
Object	createSavepoint()           Create a new JDBC 3.0 Savepoint for the current Connection, using generated savepoint names that are unique for the Connection.
Connection	getConnection()           Return the current Connection held by this ConnectionHolder.
ConnectionHandle	getConnectionHandle()           Return the ConnectionHandle held by this ConnectionHolder.
protected  boolean	hasConnection()           Return whether this holder currently has a Connection.
protected  boolean	isTransactionActive()           Return whether this holder represents an active, JDBC-managed transaction.
void	released()           Releases the current Connection held by this ConnectionHolder.
protected  void	setConnection(Connection connection)           Override the existing Connection handle with the given Connection.
protected  void	setTransactionActive(boolean transactionActive)           Set whether this holder represents an active, JDBC-managed transaction.
boolean	supportsSavepoints()           Return whether JDBC 3.0 Savepoints are supported.

 

Methods inherited from class org.springframework.transaction.support.ResourceHolderSupport
getDeadline, getTimeToLiveInMillis, getTimeToLiveInSeconds, hasTimeout, isOpen, isRollbackOnly, isSynchronizedWithTransaction, requested, reset, setRollbackOnly, setSynchronizedWithTransaction, setTimeoutInMillis, setTimeoutInSeconds

 

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

 

Field Detail

SAVEPOINT_NAME_PREFIX

public static final String SAVEPOINT_NAME_PREFIX

See Also:

Constant Field Values

Constructor Detail

ConnectionHolder

public ConnectionHolder(ConnectionHandle connectionHandle)

Create a new ConnectionHolder for the given ConnectionHandle.

Parameters:

connectionHandle - the ConnectionHandle to hold

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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.

Parameters:

connection - the JDBC Connection to hold

See Also:

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

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ConnectionHolder

public ConnectionHolder(Connection connection,
                        boolean transactionActive)

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

Parameters:

connection - the JDBC Connection to hold

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

See Also:

SimpleConnectionHandle

Method Detail

getConnectionHandle

public ConnectionHandle getConnectionHandle()

Return the ConnectionHandle held by this ConnectionHolder.

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hasConnection

protected boolean hasConnection()

Return whether this holder currently has a Connection.

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setTransactionActive

protected void setTransactionActive(boolean transactionActive)

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

See Also:

DataSourceTransactionManager

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isTransactionActive

protected boolean isTransactionActive()

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

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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.

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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.

See Also:

ConnectionHandle.getConnection(), released()

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supportsSavepoints

public boolean supportsSavepoints()
                           throws SQLException

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

Throws:

SQLException - if thrown by the JDBC driver

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createSavepoint

public Object createSavepoint()
                       throws SQLException

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

Returns:

the new Savepoint (typed as Object for JDK 1.3 compatibility)

Throws:

SQLException - if thrown by the JDBC driver

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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.

Overrides:

released in class ResourceHolderSupport

See Also:

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

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clear

public void clear()

Description copied from class: ResourceHolderSupport

Clear the transactional state of this resource holder.

Overrides:

clear in class ResourceHolderSupport

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