added AutoTransaction

Data/src/AutoTransaction.cpp

@@ -0,0 +1,96 @@
+//
+// AutoTransaction.cpp
+//
+// $Id: //poco/Main/Data/src/AutoTransaction.cpp#1 $
+//
+// Library: Data
+// Package: DataCore
+// Module:  AutoTransaction
+//
+// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// Permission is hereby granted, free of charge, to any person or organization
+// obtaining a copy of the software and accompanying documentation covered by
+// this license (the "Software") to use, reproduce, display, distribute,
+// execute, and transmit the Software, and to prepare derivative works of the
+// Software, and to permit third-parties to whom the Software is furnished to
+// do so, all subject to the following:
+// 
+// The copyright notices in the Software and this entire statement, including
+// the above license grant, this restriction and the following disclaimer,
+// must be included in all copies of the Software, in whole or in part, and
+// all derivative works of the Software, unless such copies or derivative
+// works are solely in the form of machine-executable object code generated by
+// a source language processor.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+//
+
+
+#include "Poco/Data/AutoTransaction.h"
+
+
+namespace Poco {
+namespace Data {
+
+
+AutoTransaction::AutoTransaction(Poco::Data::Session& session, Poco::Logger* pLogger):
+	_session(session),
+	_pLogger(pLogger),
+	_mustRollback(true)
+{
+	if (!_session.isTransaction())
+	{
+		_session.begin();
+	}
+}
+
+	
+AutoTransaction::~AutoTransaction()
+{
+	if (_mustRollback)
+	{
+		try
+		{
+			if (_pLogger) 
+				_pLogger->debug("Rolling back transaction.");
+
+			_session.rollback();
+		}
+		catch (Poco::Exception& exc)
+		{
+			if (_pLogger) 
+				_pLogger->fatal("Error while rolling back database transaction: " + exc.displayText());
+		}
+	}
+}
+
+	
+void AutoTransaction::commit()
+{
+	if (_pLogger) 
+		_pLogger->debug("Committing transaction.");
+
+	_session.commit();
+	_mustRollback = false;
+}
+
+	
+void AutoTransaction::rollback()
+{
+	if (_pLogger) 
+		_pLogger->debug("Rolling back transaction.");
+
+	_session.rollback();
+	_mustRollback = false;
+}
+
+
+} } // namespace Poco::Data