public Mysql(){
		/*
		 * kanei thn sundesh me thn vash sthn dimiourgia tou antikeimenou
		 */
		try{
			Class.forName("com.mysql.jdbc.Driver");
			String url = "jdbc:mysql://localhost:3306/askisi9?useUnicode=true&characterEncoding=UTF-8&";
			conn = DriverManager
			          .getConnection(url
			              + "user="+user+"&password="+pass);
			stmt=conn.createStatement();
			stmt.execute("set names utf8");
		}catch(Exception e){
			JOptionPane.showMessageDialog(null, "Apotixia Epikoinwnias me tin vash!");
			e.printStackTrace();
		}
	}