using BeautySalonDBModels.Models; using Npgsql; namespace BeautySalonDBModels { public abstract class AbstractWorkWithStorage { public abstract void Add(T obj); public abstract T? Remove(int id); public abstract void Update(T obj); public abstract List GetObjects(); public abstract T? GetObject(int id); public NpgsqlConnection GetConnection() { return new NpgsqlConnection("Host=localhost;Port=5555;Username=elina;Database=beauty_salon;Password=elina"); } } }