String url = "jdbc:postgresql://localhost:5432/COUNTRY_DB";
        try {
            Class.forName("org.postgresql.Driver");
        } catch (java.lang.ClassNotFoundException e) {
            System.err.print("ClassNotFoundException: ");
            System.err.println(e.getMessage());
        }
        try {
            con = DriverManager.getConnection(url, "postgres", "0987654321");
            stmt = con.createStatement();
        } catch (SQLException ex) {
            System.err.println("SQLException: " + ex.getMessage());
        }
        return con;