WIR-MACHEN-ALLE-ARM/Casino/Database.cs

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using MySql.Data.MySqlClient;

namespace Casino
{
    internal class Database
    {
        private string myConnectionString = "server=mysql.pb.bib.de;uid=pbg2h25ala;pwd=a7TP2aRv7Xdu;database=pbg2h25ala_Casino";
        public ObservableCollection<User> GetUser()
        {
            ObservableCollection<User> user = new ObservableCollection<User>();

            try
            {
                MySql.Data.MySqlClient.MySqlConnection myConnection;
                myConnection = new MySql.Data.MySqlClient.MySqlConnection(myConnectionString);
                //open a connection
                myConnection.Open();

                // create a MySQL command and set the SQL statement with parameters
                MySqlCommand myCommand = new MySqlCommand();
                myCommand.Connection = myConnection;
                myCommand.CommandText = @"SELECT * FROM Nutzer";
                // myCommand.Parameters.AddWithValue("@code", "12");

                // execute the command and read the results
                using MySqlDataReader myReader = myCommand.ExecuteReader();

                while (myReader.Read())
                {
                    User u = new User(myReader.GetString("name"), myReader.GetInt32("age"), myReader.GetString("passwort"))
                    {
                        ID = myReader.GetString("id"),
                        Name = myReader.GetString("name"),
                        Alter = myReader.GetInt32("age"),
                        Passwort = myReader.GetString("passwort"),
                        Geld = myReader.GetDecimal("geld"),
                        Rolle = myReader.GetString("Rolle")
                    };

                    user.Add(u);
                }


                myConnection.Close();
            }
            catch (MySql.Data.MySqlClient.MySqlException ex)
            {
                Console.WriteLine(ex.Message);
            }

            return user;
        }


        public void InsertUser(User user)
        {
            using (MySqlConnection conn = new MySqlConnection(myConnectionString))
            {
                conn.Open();

                using (MySqlCommand cmd = new MySqlCommand(
                    @"INSERT INTO Nutzer
                    (id, name, age, passwort, geld)
                    VALUES
                    (@id, @name, @alter, @passwort, @geld)",
                    conn))
                {
                    cmd.Parameters.AddWithValue("@id", user.ID);
                    cmd.Parameters.AddWithValue("@name", user.Name);
                    cmd.Parameters.AddWithValue("@alter", user.Alter);
                    cmd.Parameters.AddWithValue("@passwort", user.Passwort);
                    cmd.Parameters.AddWithValue("@geld", user.Geld);

                    cmd.ExecuteNonQuery();
                }
            }
        }


        public byte[] GetCardImage(int id)
        {
            byte[] imageBytes = null;

            using (MySqlConnection conn = new MySqlConnection(myConnectionString))
            {
                conn.Open();
                using (MySqlCommand cmd = new MySqlCommand("SELECT bild FROM Karten WHERE kartenid = @id", conn))
                {
                    cmd.Parameters.AddWithValue("@id", id);

                    using (MySqlDataReader reader = cmd.ExecuteReader())
                    {
                        if (reader.Read())
                        {
                            imageBytes = (byte[])reader["bild"];
                        }
                    }
                }
            }

            return imageBytes;
        }

        public List<Busfahrer.Card> GetAllCards()
        {
            var cards = new List<Busfahrer.Card>();

            using (MySqlConnection conn = new MySqlConnection(myConnectionString))
            {
                conn.Open();
                // Lädt alle echten Karten aus der Tabelle (schließt Rückseite 'Back' aus)
                string query = "SELECT kartenid, wert, farbe, bild FROM Karten WHERE wert != 'Back' AND deckid != 'Slots'";
                using (MySqlCommand cmd = new MySqlCommand(query, conn))
                {
                    using (MySqlDataReader reader = cmd.ExecuteReader())
                    {
                        while (reader.Read())
                        {
                            int id = reader.GetInt32("kartenid");
                            string wert = reader.GetString("wert");
                            string farbe = reader.GetString("farbe");
                            byte[] img = (byte[])reader["bild"];

                            cards.Add(new Busfahrer.Card(id, wert, farbe, img));
                        }
                    }
                }
            }

            return cards;
        }

        // NEU: Holt das Bild der Kartenrückseite
        public byte[] GetCardBackImage()
        {
            byte[] imageBytes = null;

            using (MySqlConnection conn = new MySqlConnection(myConnectionString))
            {
                conn.Open();
                string query = "SELECT bild FROM Karten WHERE wert = 'Back' OR deckid = 'Back' LIMIT 1";
                using (MySqlCommand cmd = new MySqlCommand(query, conn))
                {
                    using (MySqlDataReader reader = cmd.ExecuteReader())
                    {
                        if (reader.Read())
                        {
                            imageBytes = (byte[])reader["bild"];
                        }
                    }
                }
            }

            return imageBytes;
        }

        public byte[] GetSound(int id)
        {
            byte[] soundBytes = null;

            using (MySqlConnection conn = new MySqlConnection(myConnectionString))
            {
                conn.Open();
                using (MySqlCommand cmd = new MySqlCommand("SELECT sound FROM Sounds WHERE id = @id",conn))
                {
                    cmd.Parameters.AddWithValue("@id", id);

                    using (MySqlDataReader reader = cmd.ExecuteReader())
                    {
                        if (reader.Read())
                        {
                            soundBytes = (byte[])reader["sound"];
                        }
                    }
                }
            }

            return soundBytes;
        }
        public void UpdateGeld(string id, decimal geld)
        {
            using (MySqlConnection conn = new MySqlConnection(myConnectionString))
            {
                conn.Open();

                using (MySqlCommand cmd = new MySqlCommand(
                    "UPDATE Nutzer SET Geld = @geld WHERE id = @id", conn))
                {
                    cmd.Parameters.AddWithValue("@geld", geld);
                    cmd.Parameters.AddWithValue("@id", id);

                    cmd.ExecuteNonQuery();
                }
            }
        }

        public bool SelectAdmin(string userId)
        {
            using MySqlConnection connection = new MySqlConnection(myConnectionString);

            try
            {
                connection.Open();

                string sql = @"
            SELECT COUNT(*)
            FROM Nutzer
            WHERE id = @id
              AND Rolle = 'Admin'";

                using MySqlCommand command = new MySqlCommand(sql, connection);

                command.Parameters.AddWithValue("@id", userId);

                int count = Convert.ToInt32(command.ExecuteScalar());

                return count > 0;
            }
            catch (Exception ex)
            {
                MessageBox.Show(
                    "Fehler bei der Admin-Abfrage:\n" + ex.Message,
                    "Datenbankfehler",
                    MessageBoxButton.OK,
                    MessageBoxImage.Error);

                return false;
            }
        }

        public bool DeleteUser(string userId)
        {
            using MySqlConnection connection = new MySqlConnection(myConnectionString);

            try
            {
                connection.Open();

                string sql = @"
            DELETE FROM Nutzer
            WHERE id = @id";

                using MySqlCommand command = new MySqlCommand(sql, connection);

                command.Parameters.AddWithValue("@id", userId);

                int affectedRows = command.ExecuteNonQuery();

                return affectedRows > 0;
            }
            catch (Exception ex)
            {
                MessageBox.Show(
                    "Fehler beim Löschen des Benutzers:\n" + ex.Message,
                    "Datenbankfehler",
                    MessageBoxButton.OK,
                    MessageBoxImage.Error);

                return false;
            }
        }

        public bool UpdateUser(
            string userId,
            string name,
            int age,
            string passwort,
            decimal geld,
            string rolle)
        {
            using MySqlConnection connection = new MySqlConnection(myConnectionString);

            try
            {
                connection.Open();

                string sql = @"
            UPDATE Nutzer
            SET name = @name,
                age = @age,
                passwort = @passwort,
                geld = @geld,
                Rolle = @rolle
            WHERE id = @id";

                using MySqlCommand command = new MySqlCommand(sql, connection);

                command.Parameters.AddWithValue("@name", name);
                command.Parameters.AddWithValue("@age", age);
                command.Parameters.AddWithValue("@passwort", passwort);
                command.Parameters.AddWithValue("@geld", geld);
                command.Parameters.AddWithValue("@rolle", rolle);
                command.Parameters.AddWithValue("@id", userId);

                int affectedRows = command.ExecuteNonQuery();

                return affectedRows > 0;
            }
            catch (Exception ex)
            {
                MessageBox.Show(
                    "Fehler beim Aktualisieren des Benutzers:\n" + ex.Message,
                    "Datenbankfehler",
                    MessageBoxButton.OK,
                    MessageBoxImage.Error);

                return false;
            }
        }

    }
}