public String printall() {
                String numusers = "";
		String dbUrl = "jdbc:derby://localhost:1527/autoviacao";
		String dbClass = "com.mysql.jdbc.Driver";
		String query = "select * from percursos";
		String userName = "root", password = "root";
		try {

		Class.forName("org.apache.derby.jdbc.ClientDriver");
		Connection con = DriverManager.getConnection (dbUrl, userName, password);
		Statement stmt = con.createStatement();
		ResultSet rs = stmt.executeQuery(query);
                while (rs.next()) {
			numusers += rs.getString("id")+","+
                                rs.getString("origem")+","+
                                rs.getString("destino")+","+
                                rs.getString("partida")+","+
                                rs.getString("tempo")+";";


                } //end while
			con.close();
		} //end try