//Kết nối tới CSDL

    public Connection connect() {
        Connection con = null;
        String url = "jdbc:mysql://localhost:3306/phanxuong";
        try {
            Class.forName("com.mysql.jdbc.Driver");
            con = DriverManager.getConnection(url, "root", "123456");
            } catch (Exception e) {
        e.printStackTrace();
        }
        return con;
    }
    //select
    public ResultSet select(String sql, Connection connect) {
        ResultSet rs = null;
        try {
            rs = connect.createStatement().executeQuery(sql);
        }catch (SQLException e) {
            e.printStackTrace();
        }
        return rs;
    }
    //Update
    public int update(String sql, Connection connect) {
    int rs = 0;
    try {
        rs = connect.createStatement().executeUpdate(sql);
    } catch (SQLException e) {
        e.printStackTrace();
    }
    return rs;
    }
    //Dong ket noi CSDL
    public void closeConnection(Connection connect) {
        try {
        connect.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }