SubSonic 3 domanda semplice repository

Question

Sto usando modello semplice repository di Subsonic 3 per memorizzare e ottenere i valori dal database. Vorrei sapere se devo usare Singleton Patten per creare SimpleRepository o dovrei creare uno ogni volta che è necessario. Come se ho classe Persona in questo modo:

public class Person
{
    public void Save()
    {
        var repo=new SimpleRepository("constr"); //CREATE REPO HERE
        repo.Add<Person>(this);
    }

    public void Load(int id)
    {
        var repo=new SimpleRepository("constr");//CREATE REPO HER
        .....
    }
}

o accedere pronti contro termine come questo

public class Person
{
    public void Save()
    {
        var repo=RepoHelper.GetRepository();//GET FROM SINGLETON OBJECT
        repo.Add<Person>(this);
    }

    public void Load(int id)
    {
        var repo=RepoHelper.GetRepository();
        .....
    }
}

Answer 1

I use a singleton class for it. It seems to be the right thing when you have a centralized data store. I allows you to manage the type of repository in one place. Is also has the advantage that it makes it easier to switch from reposition type.

public static class Repository
{
    static SimpleRepository repo;

    public static IRepository GetRepository()
    {
        if (repo == null)
        {
            lock (repo)
            {
                repo = new SimpleRepository("NamedConnectionString",
                    SimpleRepositoryOptions.RunMigrations);
            }
        }

        return repo;
    }
}

Ps. I also build a base record class to do a Save() and to manage foreign relations.