sessionimpl.h.svn-base

很好用的网络封装库,不熟悉网络编程的人也可以使用。使用风格良好的标准c++编写。

//
// SessionImpl.h
//
// $Id: //poco/1.3/Data/SQLite/include/Poco/Data/SQLite/SessionImpl.h#3 $
//
// Library: SQLite
// Package: SQLite
// Module:  SessionImpl
//
// Definition of the SessionImpl class.
//
// 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.
//


#ifndef DataConnectors_SQLite_SessionImpl_INCLUDED
#define DataConnectors_SQLite_SessionImpl_INCLUDED


#include "Poco/Data/SQLite/SQLite.h"
#include "Poco/Data/SQLite/Binder.h"
#include "Poco/Data/AbstractSessionImpl.h"
#include "Poco/SharedPtr.h"


struct sqlite3;
struct sqlite3_stmt;


namespace Poco {
namespace Data {
namespace SQLite {


class SQLite_API SessionImpl: public Poco::Data::AbstractSessionImpl<SessionImpl>
	/// Implements SessionImpl interface.
{
public:
	SessionImpl(const std::string& fileName);
		/// Creates the SessionImpl. Opens a connection to the database.

	~SessionImpl();
		/// Destroys the SessionImpl.

	Poco::Data::StatementImpl* createStatementImpl();
		/// Returns an SQLite StatementImpl.

	void begin();
		/// Starts a transaction.

	void commit();
		/// Commits and ends a transaction.

	void rollback();
		/// Aborts a transaction.

	void close();
		/// Closes the session.
		
	bool isTransaction();
		/// Returns true iff a transaction is in progress.

	bool isConnected();
		/// Returns true iff connected, false otherwise.

private:
	void open();
		/// Opens a connection to the Database.

	std::string _dbFileName;
	sqlite3*    _pDB;
	bool        _connected;
	bool        _isTransaction;
	
	static const std::string DEFERRED_BEGIN_TRANSACTION;
	static const std::string COMMIT_TRANSACTION;
	static const std::string ABORT_TRANSACTION;
};


//
// inlines
//
inline 	bool SessionImpl::isTransaction()
{
	return _isTransaction;
}


} } } // namespace Poco::Data::SQLite


#endif // DataConnectors_SQLite_SessionImpl_INCLUDED