#include <vcl.h>
#include <conio.h>
#pragma hdrstop

#include <tchar.h>
//---------------------------------------------------------------------------

#pragma argsused


struct IDBSession
{
	virtual void Begin( void ) = 0;
	virtual void End( void )   = 0;
};

class TAccess : public IDBSession
{
	public:
	  void Begin( void ) {
		 ShowMessage("TAccess begin");
	  }

	  void End( void ) {
		 ShowMessage("TAccess end");
	  }
};

class TOracle : public IDBSession
{
	public:
	  void Begin( void ) {
		 ShowMessage("TOra begin");
	  }

	  void End( void ) {
		 ShowMessage("TOra end");
	  }
};

class TSession
{
	IDBSession *Session;

		public:
			TSession( int t )
			{
				if( t == 0 )
					Session = new TAccess;

				if( t == 1 )
					Session = new TOracle;
			}

		   ~TSession() {
				delete Session;
			}

			void Begin()
			{
				Session->Begin();
			}
};

int _tmain(int argc, _TCHAR* argv[])
{

	TSession Sean(0);

	Sean.Begin();

	getch();

	return 0;
}