Blagodat/Hardik/Conect/ConnectorV2.cs

using Demka_Snova_1.Hardik.Conect.Dao;
using Npgsql;
using System;
using System.Collections.Generic;

namespace Demka_Snova_1.Hardik.Conect
{
    public class DatabaseConnection : IDisposable
    {
        private readonly NpgsqlConnection _connection;

        public DatabaseConnection()
        {
            string connectionString = "Server=45.67.56.214;Port=5421;Database=user16;User Id=user16;Password=dZ28IVE5;";
            _connection = new NpgsqlConnection(connectionString);
            _connection.Open();
        }

        public List<SotrudnikDao> GetAllSotrudniki()
        {
            var sotrudniki = new List<SotrudnikDao>();
            using (var cmd = new NpgsqlCommand("SELECT * FROM \"Demo_Blago\".\"Sotrudnik\"", _connection))
            using (var reader = cmd.ExecuteReader())
            {
                while (reader.Read())
                {
                    sotrudniki.Add(new SotrudnikDao
                    {
                        ID = reader.GetInt32(reader.GetOrdinal("ID")),
                        Pozition = reader.GetString(reader.GetOrdinal("Pozition")),
                        Fio = reader.GetString(reader.GetOrdinal("Fio")),
                        Login = reader.GetString(reader.GetOrdinal("Login")),
                        Pass = reader.GetString(reader.GetOrdinal("Pass")),
                        LaspEnt = reader.GetString(reader.GetOrdinal("LaspEnt")),
                        TipeEnt = reader.GetString(reader.GetOrdinal("TipeEnt"))
                    });
                }
            }
            return sotrudniki;
        }

        public List<KlientDao> GetAllKlienti()
        {
            var klienti = new List<KlientDao>();
            using (var cmd = new NpgsqlCommand("SELECT * FROM \"Demo_Blago\".Klient", _connection))
            using (var reader = cmd.ExecuteReader())
            {
                while (reader.Read())
                {
                    klienti.Add(new KlientDao
                    {
                        Fio = reader.GetString(reader.GetOrdinal("FIO")),
                        Code = reader.GetInt32(reader.GetOrdinal("Code")),
                        Passport = reader.GetString(reader.GetOrdinal("Pasport")),
                        Birth_Day = reader.GetDateTime(reader.GetOrdinal("Birth_Day")),
                        Adres = reader.GetString(reader.GetOrdinal("Adres")),
                        Email = reader.GetString(reader.GetOrdinal("Email")),
                        password = reader.GetString(reader.GetOrdinal("password"))
                    });
                }
            }
            return klienti;
        }

        public List<ordersDao> GetAllOrders()
        {
            var orders = new List<ordersDao>();
            using (var cmd = new NpgsqlCommand("SELECT o.*, k.\"FIO\" as klient_fio FROM \"Demo_Blago\".orders o LEFT JOIN \"Demo_Blago\".\"Klient\" k ON o.klient = k.\"Code\"", _connection))
            using (var reader = cmd.ExecuteReader())
            {
                while (reader.Read())
                {
                    orders.Add(new ordersDao
                    {
                        ID = reader.GetInt32(reader.GetOrdinal("ID")),
                        CodeZakaz = reader.GetString(reader.GetOrdinal("code")),
                        Date = DateOnly.FromDateTime(reader.GetDateTime(reader.GetOrdinal("sozdanie"))),
                        Time = TimeOnly.FromTimeSpan(reader.GetTimeSpan(reader.GetOrdinal("time"))),
                        CodeClient = reader.IsDBNull(reader.GetOrdinal("klient")) ? null : reader.GetInt32(reader.GetOrdinal("klient")).ToString(),
                        Usluga = reader.GetString(reader.GetOrdinal("Usluga")),
                        Status = reader.GetString(reader.GetOrdinal("Status")),
                        DateClose = reader.IsDBNull(reader.GetOrdinal("Zakritie")) ? null : DateOnly.FromDateTime(reader.GetDateTime(reader.GetOrdinal("Zakritie"))),
                        Prokat = reader.GetDecimal(reader.GetOrdinal("prokat")),
                        klient = new KlientDao
                        {
                            Fio = reader.IsDBNull(reader.GetOrdinal("klient_fio")) ? null : reader.GetString(reader.GetOrdinal("klient_fio"))
                        }
                    });
                }
            }
            return orders;
        }

        public List<uslugiDao> GetAllUslugi()
        {
            var uslugi = new List<uslugiDao>();
            using (var cmd = new NpgsqlCommand("SELECT * FROM \"Demo_Blago\".uslugi", _connection))
            using (var reader = cmd.ExecuteReader())
            {
                while (reader.Read())
                {
                    uslugi.Add(new uslugiDao
                    {
                        id = int.Parse(reader.GetString(reader.GetOrdinal("id"))),
                        Name = reader.GetString(reader.GetOrdinal("name")),
                        Code = reader.GetString(reader.GetOrdinal("code")),
                        PrisePerH = reader.GetInt32(reader.GetOrdinal("prisePerH"))
                    });
                }
            }
            return uslugi;
        }

        public List<historyDao> GetAllHistory()
        {
            var history = new List<historyDao>();
            using (var cmd = new NpgsqlCommand("SELECT * FROM \"Demo_Blago\".history", _connection))
            using (var reader = cmd.ExecuteReader())
            {
                while (reader.Read())
                {
                    history.Add(new historyDao
                    {
                        id = reader.GetInt32(reader.GetOrdinal("id")),
                        user = reader.GetString(reader.GetOrdinal("User")),
                        Vhod = reader.GetDateTime(reader.GetOrdinal("vrema")),
                        status = reader.GetString(reader.GetOrdinal("status"))
                    });
                }
            }
            return history;
        }

        public void AddSotrudnik(SotrudnikDao sotrudnik)
        {
            using (var cmd = new NpgsqlCommand(
                "INSERT INTO \"Demo_Blago\".\"Sotrudnik\" " +
                "(\"ID\", \"Pozition\", \"Fio\", \"Login\", \"Pass\", \"LaspEnt\", \"TipeEnt\") " +
                "VALUES (@id, @pozition, @fio, @login, @pass, @laspEnt, @tipeEnt)", _connection))
            {
                cmd.Parameters.AddWithValue("id", sotrudnik.ID);
                cmd.Parameters.AddWithValue("pozition", sotrudnik.Pozition);
                cmd.Parameters.AddWithValue("fio", sotrudnik.Fio);
                cmd.Parameters.AddWithValue("login", sotrudnik.Login);
                cmd.Parameters.AddWithValue("pass", sotrudnik.Pass);
                cmd.Parameters.AddWithValue("laspEnt", sotrudnik.LaspEnt);
                cmd.Parameters.AddWithValue("tipeEnt", sotrudnik.TipeEnt);
                cmd.ExecuteNonQuery();
            }
        }

        public void UpdateSotrudnik(SotrudnikDao sotrudnik)
        {
            using (var cmd = new NpgsqlCommand(
                "UPDATE \"Demo_Blago\".\"Sotrudnik\" SET " +
                "\"Pozition\" = @pozition, \"Fio\" = @fio, \"Login\" = @login, " +
                "\"Pass\" = @pass, \"LaspEnt\" = @laspEnt, \"TipeEnt\" = @tipeEnt " +
                "WHERE \"ID\" = @id", _connection))
            {
                cmd.Parameters.AddWithValue("id", sotrudnik.ID);
                cmd.Parameters.AddWithValue("pozition", sotrudnik.Pozition);
                cmd.Parameters.AddWithValue("fio", sotrudnik.Fio);
                cmd.Parameters.AddWithValue("login", sotrudnik.Login);
                cmd.Parameters.AddWithValue("pass", sotrudnik.Pass);
                cmd.Parameters.AddWithValue("laspEnt", sotrudnik.LaspEnt);
                cmd.Parameters.AddWithValue("tipeEnt", sotrudnik.TipeEnt);
                cmd.ExecuteNonQuery();
            }
        }

        public void DeleteSotrudnik(int id)
        {
            using (var cmd = new NpgsqlCommand(
                "DELETE FROM \"Demo_Blago\".\"Sotrudnik\" WHERE \"ID\" = @id", _connection))
            {
                cmd.Parameters.AddWithValue("id", id);
                cmd.ExecuteNonQuery();
            }
        }

        public void AddOrder(ordersDao order)
        {
            using (var cmd = new NpgsqlCommand(
                "INSERT INTO \"Demo_Blago\".orders " +
                "(\"ID\", \"code\", \"sozdanie\", \"time\", \"klient\", \"Usluga\", \"Status\", \"Zakritie\", \"prokat\") " +
                "VALUES (@id, @code, @sozdanie, @time, @klient, @usluga, @status, @zakritie, @prokat)", _connection))
            {
                cmd.Parameters.AddWithValue("id", order.ID);
                cmd.Parameters.AddWithValue("code", order.CodeZakaz);
                cmd.Parameters.AddWithValue("sozdanie", order.Date.ToDateTime(TimeOnly.MinValue));
                cmd.Parameters.AddWithValue("time", order.Time.ToTimeSpan());
                cmd.Parameters.AddWithValue("klient", int.Parse(order.CodeClient));
                cmd.Parameters.AddWithValue("usluga", order.Usluga);
                cmd.Parameters.AddWithValue("status", order.Status);
                cmd.Parameters.AddWithValue("zakritie", order.DateClose?.ToDateTime(TimeOnly.MinValue) ?? (object)DBNull.Value);
                cmd.Parameters.AddWithValue("prokat", order.Prokat);
                cmd.ExecuteNonQuery();
            }
        }

        public void Dispose()
        {
            _connection?.Close();
            _connection?.Dispose();
        }
    }
}