FlyTeam/SkyTeam/BuchungenPage.xaml.cs

using System;
using System.Data;
using System.Windows;
using System.Windows.Controls;
using MySql.Data.MySqlClient;

namespace SkyTeam
{
    public partial class BuchungenPage : Page
    {
        public BuchungenPage()
        {
            InitializeComponent();
            LoadBookings();
        }

        private void LoadBookings()
        {
            if (SessionManager.CurrentUserId == 0) return; 

            string query = @"SELECT b.Id AS BuchungId, f.Flugnummer, f.Abflugort, f.Zielort, f.Abflugdatum, b.Status 
                             FROM buchungen b
                             JOIN fluege f ON b.FlugId = f.Id
                             WHERE b.UserId = @uid";

            try
            {
                using (MySqlConnection conn = new MySqlConnection(DatenbankServices.GetConnection()))
                {
                    conn.Open();
                    MySqlCommand cmd = new MySqlCommand(query, conn);
                    cmd.Parameters.AddWithValue("@uid", SessionManager.CurrentUserId);

                    MySqlDataAdapter adapter = new MySqlDataAdapter(cmd);
                    DataTable dt = new DataTable();
                    adapter.Fill(dt);

                    if (dt.Rows.Count > 0)
                    {
                        BookingsGrid.ItemsSource = dt.DefaultView;
                        NoBookingsView.Visibility = Visibility.Collapsed;
                        BookingsGrid.Visibility = Visibility.Visible;
                        CancelBtn.Visibility = Visibility.Visible;
                    }
                    else
                    {
                        NoBookingsView.Visibility = Visibility.Visible;
                        BookingsGrid.Visibility = Visibility.Collapsed;
                        CancelBtn.Visibility = Visibility.Collapsed;
                    }
                }
            }
            catch (Exception ex) { MessageBox.Show(ex.Message); }
        }

        private void CancelBooking_Click(object sender, RoutedEventArgs e)
        {
            if (BookingsGrid.SelectedItem == null)
            {
                MessageBox.Show("Bitte wählen Sie einen Flug aus.");
                return;
            }

            DataRowView row = (DataRowView)BookingsGrid.SelectedItem;
            int bid = Convert.ToInt32(row["BuchungId"]);

            if (MessageBox.Show("Stornieren?", "Confirm", MessageBoxButton.YesNo) == MessageBoxResult.Yes)
            {
                using (MySqlConnection conn = new MySqlConnection(DatenbankServices.GetConnection()))
                {
                    conn.Open();
                    new MySqlCommand($"DELETE FROM buchungen WHERE Id={bid}", conn).ExecuteNonQuery();
                }
                LoadBookings(); 
            }
        }

        private void HomeButton_Click(object sender, RoutedEventArgs e) => NavigationService.Navigate(new NavigationPage());
        private void BookingsButton_Click(object sender, RoutedEventArgs e) => NavigationService.Navigate(new BuchungenPage());
        private void SettingsButton_Click(object sender, RoutedEventArgs e) => NavigationService.Navigate(new SettingsPage());
        private void LogoutButton_Click(object sender, RoutedEventArgs e) => NavigationService.Navigate(new LogInPage());
        private void OpenReservierungSuche_Click(object sender, RoutedEventArgs e) => NavigationService.Navigate(new ReservierungssuchePage());
    }
}