CineBook Projekt hinzugefügt

2026-03-12 14:28:52 +01:00
commit b6357c9b8a
33 changed files with 2857 additions and 0 deletions
--- a/Data/Db.cs
+++ b/Data/Db.cs
@@ -0,0 +1,122 @@
+using MySqlConnector;
+using System;
+using System.Collections.Generic;
+using System.Data;
+
+namespace CineBook.Data;
+
+// Quelle: https://mysqlconnector.net/ (abgerufen: 2026-01-29)
+// Zweck: MySQL Zugriff mit parameterisierten Queries (Schutz vor SQL-Injection) + Fehlerbehandlung
+public class Db
+{
+    private readonly string _cs;
+    public Db(string connectionString) => _cs = connectionString;
+
+    // Quelle/Hilfe: https://mysqlconnector.net/transactions/ (abgerufen: 2026-03-05)
+    // Zweck: Mehrere DB-Statements atomar ausführen (z.B. Buchung + Seat-Update + Counter-Update)
+    public T InTransaction<T>(Func<MySqlConnection, MySqlTransaction, T> work)
+    {
+        using var con = new MySqlConnection(_cs);
+        con.Open();
+        using var tx = con.BeginTransaction();
+        try
+        {
+            var result = work(con, tx);
+            tx.Commit();
+            return result;
+        }
+        catch
+        {
+            try { tx.Rollback(); } catch { /* ignore rollback errors */ }
+            throw;
+        }
+    }
+
+    public int Execute(MySqlConnection con, MySqlTransaction tx, string sql, Dictionary<string, object?> p)
+    {
+        using var cmd = new MySqlCommand(sql, con, tx);
+        foreach (var kv in p)
+            cmd.Parameters.AddWithValue(kv.Key, kv.Value ?? DBNull.Value);
+        return cmd.ExecuteNonQuery();
+    }
+
+    public List<T> Query<T>(MySqlConnection con, MySqlTransaction tx, string sql, Dictionary<string, object?> p, Func<MySqlDataReader, T> map)
+    {
+        using var cmd = new MySqlCommand(sql, con, tx);
+        foreach (var kv in p)
+            cmd.Parameters.AddWithValue(kv.Key, kv.Value ?? DBNull.Value);
+        using var r = cmd.ExecuteReader();
+        var list = new List<T>();
+        while (r.Read()) list.Add(map(r));
+        return list;
+    }
+
+    public List<T> Query<T>(string sql, Dictionary<string, object?> p, Func<MySqlDataReader, T> map)
+    {
+        try
+        {
+            using var con = new MySqlConnection(_cs);
+            con.Open();
+            using var cmd = new MySqlCommand(sql, con);
+            foreach (var kv in p)
+                cmd.Parameters.AddWithValue(kv.Key, kv.Value ?? DBNull.Value);
+            using var r = cmd.ExecuteReader();
+            var list = new List<T>();
+            while (r.Read()) list.Add(map(r));
+            return list;
+        }
+        catch (MySqlException ex)
+        {
+            throw new Exception("DB-Fehler: " + ex.Message, ex);
+        }
+    }
+
+    public List<T> Query<T>(string sql, Func<MySqlDataReader, T> map)
+        => Query(sql, new Dictionary<string, object?>(), map);
+
+    public int Execute(string sql, Dictionary<string, object?> p)
+    {
+        try
+        {
+            using var con = new MySqlConnection(_cs);
+            con.Open();
+            using var cmd = new MySqlCommand(sql, con);
+            foreach (var kv in p)
+                cmd.Parameters.AddWithValue(kv.Key, kv.Value ?? DBNull.Value);
+            return cmd.ExecuteNonQuery();
+        }
+        catch (MySqlException ex)
+        {
+            throw new Exception("DB-Fehler: " + ex.Message, ex);
+        }
+    }
+
+    public long InsertAndGetId(string sql, Dictionary<string, object?> p)
+    {
+        try
+        {
+            using var con = new MySqlConnection(_cs);
+            con.Open();
+            using var cmd = new MySqlCommand(sql, con);
+            foreach (var kv in p)
+                cmd.Parameters.AddWithValue(kv.Key, kv.Value ?? DBNull.Value);
+            cmd.ExecuteNonQuery();
+            return cmd.LastInsertedId;
+        }
+        catch (MySqlException ex)
+        {
+            throw new Exception("DB-Fehler: " + ex.Message, ex);
+        }
+    }
+
+    public bool TestConnection()
+    {
+        try
+        {
+            using var con = new MySqlConnection(_cs);
+            con.Open();
+            return con.State == ConnectionState.Open;
+        }
+        catch { return false; }
+    }
+}