Beauty_Salon/BeautySalon/BeautySalonDBModels/Implements/ReceptionBD.cs

using BeautySalonDBModels.Models;
using Npgsql;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace BeautySalonDBModels.Implements
{
    public class ReceptionBD : AbstractWorkWithStorage<Reception>
    {
        public override void Add(Reception reception)
        {
            using var conn = GetConnection();
            conn.Open();
            using var cmd = new NpgsqlCommand("INSERT INTO receptions (reception_id, master_id, service_id, date_reception) " +
                "VALUES ((nextval('seq_reception'), @MasterId, @ServiceId, @DateReception)", conn);
            cmd.Parameters.AddWithValue("@MasterId", reception.MasterId);
            cmd.Parameters.AddWithValue("@ServiceId", reception.ServiceId);
            cmd.Parameters.AddWithValue("@DateReception", reception.DateReception);
            cmd.ExecuteNonQuery();
        }

        public override Reception? GetObject(int id)
        {
            using var conn = GetConnection();
            conn.Open();
            using var cmd = new NpgsqlCommand("SELECT * FROM receptions WHERE reception_id = @id", conn);
            cmd.Parameters.AddWithValue("@id", id);
            using var reader = cmd.ExecuteReader();
            if (reader.Read())
            {
                return new Reception
                {
                    ReceptionId = reader.GetInt32(0),
                    MasterId = reader.GetInt32(1),
                    ServiceId = reader.GetInt32(2),
                    DateReception = reader.GetDateTime(3)
                };
            }
            return null;
        }

        public override List<Reception> GetObjects()
        {
            var receptions = new List<Reception>();
            using var conn = GetConnection();
            conn.Open();
            using var cmd = new NpgsqlCommand("SELECT * FROM receptions order by reception_id", conn);
            using var reader = cmd.ExecuteReader();
            while (reader.Read())
            {
                receptions.Add(new Reception
                {
                    ReceptionId = reader.GetInt32(0),
                    MasterId = reader.GetInt32(1),
                    ServiceId = reader.GetInt32(2),
                    DateReception = reader.GetDateTime(3)
                });
            }
            return receptions;
        }

        public override Reception? Remove(int id)
        {
            var reception = GetObject(id);
            using var conn = GetConnection();
            conn.Open();
            using var cmd = new NpgsqlCommand("delete from receptions where reception_id = @id", conn);
            cmd.Parameters.AddWithValue("@id", id);
            cmd.ExecuteNonQuery();
            return reception;
        }

        public override void Update(Reception reception)
        {
            using var conn = GetConnection();
            conn.Open();
            using var cmd = new NpgsqlCommand("update reception set master_id = @MasterId, " +
                "service_id = @ServiceId, date_reception = @DateReception where reception_id = @ReceptionId", conn);
            cmd.Parameters.AddWithValue("@MasterId", reception.MasterId);
            cmd.Parameters.AddWithValue("@ServiceId", reception.ServiceId);
            cmd.Parameters.AddWithValue("@DateReception", reception.DateReception);
            cmd.Parameters.AddWithValue("@ReceptionId", reception.ReceptionId);
           
            cmd.ExecuteNonQuery();
        }
    }
}