甲骨文的意思是什么系统数据.Linq.DataContext?

我正在针对Oracle数据库实现IRepository接口。

public interface IDinnerRepository {

    IQueryable<Dinner> FindAllDinners();
    IQueryable<Dinner> FindByLocation(float latitude, float longitude);
    IQueryable<Dinner> FindUpcomingDinners();
    Dinner             GetDinner(int id);

    void Add(Dinner dinner);
    void Delete(Dinner dinner);

    void Save();
}

    /// <summary>
    /// Database context
    /// </summary>
    private DBDataContext db = new DBDataContext();

    public void Save()
    {
        this.db.SubmitChanges();
    }

谢谢!