private static void InsertData()
{
var eCars = ProcessCars("fuel.csv");
var db = new CarsDB();
//db.Database.Log = Console.WriteLine;
foreach (var car in eCars)
{
if (!db.Cars.Any())
{
db.Cars.Add(car);
}
//db.SaveChanges();
}
}
static void Main(string[] args)
{
Database.SetInitializer(new DropCreateDatabaseIfModelChanges <CarsDB>());
InsertData();
QueryData();
var db = new CarsDB();
var cars = ProcessCars("fuel.csv");
var mfrs = ProcessMfrs("manufacturers.csv");
var query = db.Cars.OrderByDescending(c => c.Combo).Take(40);
foreach (var car in query)
{
Console.WriteLine($"{ car.Mfr} == {car.Combo }");
}
//var xDocument = new XDocument(); /// *** Xml samples
//var xCars = new XElement("Cars", /// All this could be place in a separate method
// from car in cars
// select new XElement("Cars",
// new XAttribute("Name", car.Name),
// new XAttribute("Combined", car.Combo),
// new XAttribute("Mfr", car.Mfr))
// );
//xDocument.Add(xCars);
//xDocument.Save("fuel.xml");
// QueryXML();
// ****************** Using Entity
// **************** end Using Entity
//var query = cars.Where(c => c.Displacement > 5.9 && c.Cylinders > 8).OrderByDescending(c => c.Combo).ThenBy(c => c.Mfr);
/// ** note this query method works as well
var query2 =
from car in cars
join mfr in mfrs
on car.Mfr equals mfr.Name
orderby car.Combo descending, car.Mfr ascending
select new //sets a new 'anonymous type'. will only pull these values into the cars query
{
mfr.HQ,
car.Mfr,
car.Name,
car.Combo
};
// *** below is a join statement. Use the outer join with the smaller file size. m symbolizes the Manufacturer data source
var query3 = cars.Join(mfrs,
c => c.Mfr,
m => m.Name,
(c, m) => new
{
m.HQ,
c.Name,
c.Mfr,
c.Combo
})
.OrderByDescending(c => c.Combo)
.ThenBy(c => c.Mfr);
//foreach (var car in query3)
//{
// Console.WriteLine($" {car.HQ} {car.Mfr} {car.Name} MPG: {car.Combo}"); //see note above about the join anonymous query
//}
var query4 = from car in cars
group car by car.Mfr;
//foreach (var result in query4)
//{
// Console.WriteLine($"{(result.Key).PadRight(35)} || num of cars in group: {result.Count()}");
//}
//foreach (var group in query4)
//{
// Console.WriteLine(group.Key);
// foreach (var car in group.OrderByDescending(c => c.Combo).Take(4))
// {
// Console.WriteLine($"{(car.Name).PadLeft(20)} {(car.Combo)}");
// }
//}
}
