Beauty_Salon/BeautySalon/BeautySalonDBModels/AbstractWorkWithStorage.cs

using BeautySalonDBModels.Models;
using Npgsql;

namespace BeautySalonDBModels
{
    public abstract class AbstractWorkWithStorage<T>
    {
        public abstract void Add(T obj);
        public abstract T? Remove(int id);
        public abstract void Update(T obj);
        public abstract List<T> GetObjects();
        public abstract T? GetObject(int id);

        public NpgsqlConnection GetConnection()
        {
            return new NpgsqlConnection("Host=127.0.0.1;Port=5555;Username=elina;Database=beauty_salon;Password=elina");
        }
    }
}