public static void update(String qry){
        if(isConnected()){
            try {
                Statement st = con.createStatement();

                st.executeUpdate(qry);
                st.close();
            } catch (SQLException e) {
                connect();
            }
        }
    }

    public static ResultSet query(String qry){
        if(isConnected()){
            ResultSet rs = null;

            try {
                Statement st = con.createStatement();
                rs = st.executeQuery(qry);
            } catch (SQLException e) {
                connect();
            }
            return rs;
        }

        return null;
    }