private static void Warmup()
{
using (var db = new NorthwindDb())
{
db.Customers.Where(c => c.CustomerID == "-1").ToList();
}
}
/// <summary>
/// In Order to make this Demo work, you have to comment the IsUnicode Configuration
/// for the PreferedCommunication Column in the DB Context On Model Creating Method.
/// This will cause code first to assume a wrong column type which will miss some index
/// uses
/// </summary>
public void Problem()
{
Console.WriteLine("Column Type Demo");
using (var db = new NorthwindDb())
{
var faxCustomers = db.Customers.Where(c => c.PreferedCommunication == "Fax").ToList();
Console.WriteLine("{0} Customers", faxCustomers.Count);
}
}
public void Problem()
{
Console.WriteLine("Contains Demo");
using (var db = new NorthwindDb())
{
var customers = db.Customers.Where(c => c.PreferedCommunication.Contains("Pho")).ToList();
Console.WriteLine("{0} Customers", customers.Count);
}
}
public void Problem()
{
Console.WriteLine("Delete Demo");
using (var db = new NorthwindDb())
{
var maxShipperId = db.Shippers.Max(s => s.ShipperID);
var shipper = db.Shippers.Find(maxShipperId);
db.Shippers.Remove(shipper);
db.SaveChanges();
}
}
public void Solution()
{
Console.WriteLine("LateFilterDemo");
using (var db = new NorthwindDb())
{
var customers = GetCustomers2(db).Where(c => c.Country == "Germany");
foreach (var customer in customers)
{
Console.WriteLine("{0} - {1}", customer.CustomerID, customer.CompanyName);
}
}
}
public void Solution()
{
Console.WriteLine("Reloading Entities Demo - Solution");
using (var db = new NorthwindDb())
{
var s1 = db.Shippers.Find(1);
Console.WriteLine("S1: {0} - {1}", s1.ShipperID, s1.CompanyName);
var s2 = db.Shippers.Find(1);
Console.WriteLine("S2: {0} - {1}", s2.ShipperID, s2.CompanyName);
}
}
public void Solution()
{
Console.WriteLine("Delete Demo - Solution");
using (var db = new NorthwindDb())
{
var maxShipperId = db.Shippers.Max(s => s.ShipperID);
// db.Shippers.Find(maxShipperId);
var shipper = new Shippers {ShipperID = maxShipperId};
db.Shippers.Attach(shipper);
db.Shippers.Remove(shipper);
db.SaveChanges();
}
}
public void Solution()
{
Console.WriteLine("ChangeTrackingDemo - Solution");
using (var db = new NorthwindDb())
{
var shippers = db.Shippers.AsNoTracking().ToList();
for (int i = 0; i < 200 && i < shippers.Count; i++)
{
var shipper = shippers[i];
Console.WriteLine("{0} - {1}", shipper.ShipperID, shipper.CompanyName);
}
}
}
public void Problem()
{
Console.WriteLine("Late Filter Demo 2");
using (var db = new NorthwindDb())
{
var shippers = db.Shippers.ToList().Take(10);
foreach (var shipper in shippers)
{
Console.WriteLine("{0} - {1}", shipper.ShipperID, shipper.CompanyName);
}
}
}
public void Problem()
{
Console.WriteLine("ProjectionDemo");
using (var db = new NorthwindDb())
{
var products = db.Products;
foreach (var product in products)
{
Console.WriteLine("{0}", product.ProductName);
}
}
}
public void Problem()
{
Console.WriteLine("Many Rows Demo");
using (var db = new NorthwindDb())
{
var shippers = db.Shippers.ToList();
for (int i = 0; i < 10; i++)
{
Console.WriteLine("{0} - {1}", shippers[i].ShipperID, shippers[i].CompanyName);
}
}
}
public void Problem()
{
Console.WriteLine("Reloading Entities Demo");
using (var db = new NorthwindDb())
{
var s1 = db.Shippers.SingleOrDefault(c => c.ShipperID == 1);
Console.WriteLine("S1: {0} - {1}", s1.ShipperID, s1.CompanyName);
var s2 = db.Shippers.SingleOrDefault(c => c.ShipperID == 1);
Console.WriteLine("S2: {0} - {1}", s2.ShipperID, s2.CompanyName);
}
}
public void Solution()
{
Console.WriteLine("ProjectionDemo - Solution");
using (var db = new NorthwindDb())
{
var products = db.Products.Select(p => new {p.ProductName});
foreach (var product in products)
{
Console.WriteLine("{0}", product.ProductName);
}
}
}
public void Solution()
{
Console.WriteLine("Many Rows Demo - Solution");
using (var db = new NorthwindDb())
{
var shippers = db.Shippers.Take(10).ToList();
foreach (var shipper in shippers)
{
Console.WriteLine("{0} - {1}", shipper.ShipperID, shipper.CompanyName);
}
}
}
private IQueryable<Customers> GetCustomers2(NorthwindDb db)
{
return db.Customers;
}
private IEnumerable<Customers> GetCustomers(NorthwindDb db)
{
return db.Customers;
}
