public ResultSet obtenerDatos(String sql) throws SQLException {
 
        this.stmt = conn.createStatement();
        return this.stmt.executeQuery(sql);
    }
 
    public void actualizar(String sql) throws SQLException {
        this.stmt = conn.createStatement();
        stmt.executeUpdate(sql);
    }
        public ResultSet ExeGet(String Q) throws SQLException{
        Statement st = this.conn.createStatement();
        return (ResultSet) st.executeQuery(Q);
    }