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mission,
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* Copyright 1999 (C) Exoffice Technologies Inc. All Rights Reserved.
*
* $Id: TwoPhaseConnection.java,v 1.2 2002/04/21 03:03:46 mark_matthews Exp $
*/
package com.
mysql.jdbc.xa;
import java.
sql.SQLException;
/**
* Defines two-phase commit support for a JDBC connection used by
* {@link XAConnection}. A JDBC connection that can implement any of
* these features should extend this interface and attempt to
* implement as much as it can.
* <p>
* {@link #prepare} is used as part of the two phase commit protocol
* to determine whether the transaction can commit or must rollback.
* Failure to implement this method will cause all connections to vote
* for commit, whether or not they can actually commit, leading to
* mixed heuristics.
* <p>
* {@link #enableSQLTransactions} allows the SQL begin/commit/rollback
* commands to be disabled for the duration of a transaction managed
* through an {@link javax.transaction.xaXAResource}, preventing the
* application from demarcating transactions directly.
* <p>
* {@link #isCriticalError} is used to tell if an exception thrown by
* the connection is fatal and the connection should not be returned
* to the pool.
*
*
* @author <a href="3710167@qq.com">Assaf Arkin</a>
* @version 1.0
*/
public interface TwoPhaseConnection
{
/**
* Enables or disables transaction demarcation through SQL commit
* and rollback. When the connection falls under control of
* {@link XAConnection}, SQL commit/rollback commands will be
* disabled to prevent direct transaction demarcation.
*
* @param flag True to enable SQL transactions (the default)
*/
public void enableSQLTransactions( boolean flag );
/**
* Called to prepare the transaction for commit. Returns true if
* the transaction is prepared, false if the transaction is
* read-only. If the transaction has been marked for rollback,
* throws a {@link RollbackException}.
*
* @return True if can commit, false if read-only
* @throws SQLException If transaction has been marked for
* rollback or cannot commit for any other reason
*/
public boolean prepare()
throws SQLException;
/**
* Returns true if the error issued by this connection is a
* critical error and the connection should be terminated.
*
* @param except The exception thrown by this connection
*/
public boolean isCriticalError( SQLException except );
}