class CPPDB_API transaction {
		transaction(transaction const &);
		void operator=(transaction const &);
	public:
		///
		/// Begin a transaction on session \a s, calls s.begin()
		///
		transaction(session &s);
		///
		/// If the transaction wasn't committed or rolled back calls session::rollback() for the session it was created with.
		///
		~transaction();
		///
		/// Commit a transaction on the session.  Calls session::commit() for the session it was created with.
		///
		void commit();
		///
		/// Rollback a transaction on the session.  Calls session::rollback() for the session it was created with.
		///
		void rollback();
	private:
		
		struct data;
		session *s_;
		bool commited_;
		std::auto_ptr<data> d;
	};