public void insertCitizen(Citizen h)
    {
        try {
            String sql = "INSERT INTO CITIZENS VALUES('" + h.name + "','" + h.surname + "','" + h.identity + "')";
            this.stmt.execute(sql);
        } catch (SQLException ex) {
            Logger.getLogger(Dbconnection.class.getName()).log(Level.SEVERE, null, ex);
        }

    }