Programm_Wirl/AA-Klassen/Tour.cs

using DatenDB;
using Npgsql;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using ZXing;

namespace Deckungsbeitrag.AA_Klassen
{
  public class Tour
  {
    //                                0         1             2           3         4
    public const string COLUMNS = "tour_id, benutzer_id, saison_id, bezeichnung, priority";
    public const string TABLE = "kundenverwaltung.tour";

    #region Class-Standarts (Properties, Save, reader)
    public Tour() { }

    public int? TourID { get; set; }
    public int? BenutzerID { get; set; }
    public int? SaisonID { get; set; }
    public string Bezeichnung { get; set; }
    public Priority Priority { get; set; }

    public int? Save()
    {
      DatenbankConnection.GetConnection().Open();

      using (NpgsqlCommand command = new NpgsqlCommand())
      {
        command.Connection = DatenbankConnection.GetConnection();

        int? result;
        if (this.TourID.HasValue & this.TourID != 0)
        {
          command.CommandText = $"update {TABLE} set benutzer_id = :p1, saison_id = :p2, bezeichnung = :p3, priority = :p4  WHERE tour_id = :p0";
        }
        else
        {
          command.CommandText = "select nextval('kundenverwaltung.tour_seq')";
          this.TourID = (int)(long)command.ExecuteScalar();
          command.CommandText = $"insert into {TABLE} ({COLUMNS}) values (:p0, :p1, :p2, :p3, :p4)";
        }

        Match match = Regex.Match(this.Bezeichnung ?? "", @"\d+");
        int zahl = match.Success ? int.Parse(match.Value) : 0;  // oder throw bei Fehler

        command.Parameters.AddWithValue("p0", this.TourID);
        command.Parameters.AddWithValue("p1", this.BenutzerID.HasValue ? this.BenutzerID.Value : (object)DBNull.Value);
        command.Parameters.AddWithValue("p2", this.SaisonID ?? (object)DBNull.Value);
        command.Parameters.AddWithValue("p3", this.Bezeichnung);
        command.Parameters.AddWithValue("p4", zahl);

        result = command.ExecuteNonQuery();
        DatenbankConnection.GetConnection().Close();
        return result;
      }
    }


    public Tour(NpgsqlDataReader reader)
    {
      this.TourID = reader.GetInt32(0);
      this.BenutzerID = reader.IsDBNull(1) ? (int?)null : reader.GetInt32(1);
      this.SaisonID = reader.GetInt32(2);
      this.Bezeichnung = reader.IsDBNull(3) ? string.Empty : reader.GetString(3);
      this.Priority = reader.IsDBNull(4) ? Priority.None : (Priority)reader.GetInt32(4);
    }

    #endregion

    #region Konstruktors

    /// <summary>
    /// Sucht und Findet Tour wenn TourID is null, werden BenutzerID und Liefertag benötigt
    /// </summary>
    /// <param name="tourID"></param>
    /// <param name="arbeiterID"></param>
    /// <param name="liefertag"></param>
    /// <returns>Tour</returns>
    internal static Tour FindeTour(int? tourID, int? arbeiterID, DateTime? liefertag)
    {
      Tour result = null;
      DatenbankConnection.GetConnection().Open();
      using (NpgsqlCommand command = new NpgsqlCommand())
      {
        command.Connection = DatenbankConnection.GetConnection();
        if (tourID == null) command.CommandText = $"select {COLUMNS} from {TABLE} where benutzer_id = {arbeiterID} and liefertag = '{liefertag}'";
        else
        {
          if (arbeiterID == null) command.CommandText = $"select {COLUMNS} from {TABLE} where liefertag = {liefertag}";
          else command.CommandText = $"select {COLUMNS} from {TABLE} where tour_id = {tourID}";
        }
        NpgsqlDataReader reader = command.ExecuteReader();
        while (reader.Read()) result = new Tour(reader);
        reader.Close();
      }

      DatenbankConnection.GetConnection().Close();

      return result;
    }

    internal static Tour GetTour(int? saison, string bez)
    {
      Tour result = null;
      DatenbankConnection.GetConnection().Open();
      using (NpgsqlCommand command = new NpgsqlCommand())
      {
        command.Connection = DatenbankConnection.GetConnection();
        command.CommandText = $"select {COLUMNS} from {TABLE} where saison_id = {saison} and bezeichnung = '{bez}'";
        NpgsqlDataReader reader = command.ExecuteReader();
        while (reader.Read()) result = new Tour(reader);
        reader.Close();
      }

      DatenbankConnection.GetConnection().Close();

      return result;
    }

    internal static List<Tour> GetSaisonListe(Saison saison)
    {
      List<Tour> resultList = new List<Tour>();
      DatenbankConnection.GetConnection().Open();
      using (NpgsqlCommand command = new NpgsqlCommand())
      {
        command.Connection = DatenbankConnection.GetConnection();
        command.CommandText = $"select {COLUMNS} from {TABLE} where saison_id = {saison.SaisonId}";
        using (var reader = command.ExecuteReader())
        {
          while (reader.Read())
            resultList.Add(new Tour(reader));
        }
      }
      DatenbankConnection.GetConnection().Close();

      return resultList;
    }

    #endregion
  }
  public class TDaten
  {
    public string TourName { get; set; }
    public int FahrerId { get; set; }
    // pro Tag = string → eigene Kundenliste
    public Dictionary<string, List<KData>> KundenProTag { get; set; }
        = new Dictionary<string, List<KData>>();

    public Dictionary<string, int[]> Counter { get; set; }
        = new Dictionary<string, int[]>();
  }

}