public static void GenerateSqlUsingDbMigrator()
{
using (var context = new AdventureWorksContext())
{
var configuration = new Configuration
{
ContextType = typeof(AdventureWorksContext),
TargetDatabase =
new DbConnectionInfo(context.Database.Connection.ConnectionString, "System.Data.SqlClient")
};
var migrator = new DbMigrator(configuration);
var migrations = migrator.GetDatabaseMigrations();
if (migrations.Any())
{
var scriptor = new MigratorScriptingDecorator(migrator);
string script = scriptor.ScriptUpdate(null, migrations.Last());
if (!String.IsNullOrEmpty(script))
{
Console.WriteLine(script);
//context.Database.ExecuteSqlCommand(script);
}
}
Console.ReadKey();
}
}
public static void DemonstrateCaching()
{
using (var context1 = new AdventureWorksContext())
{
Product product = context1.Products.Single(p => p.ProductID == 1);
product.Name = product.Name += " - Test";
context1.SaveChanges();
Product product2 = context1.Products.Find(1); // Will not hit the database
}
Console.WriteLine("Press any key to continue...");
Console.ReadKey();
}
public static void GeneratePerformanceOutput(
Func<AdventureWorksContext, string, List<Contact>> dbCall, string outputMessage, string sql)
{
using (new MeasureUtil("Entity Framework Serialisation - " + outputMessage))
using (var context = new AdventureWorksContext())
{
List<Contact> contactsList = dbCall(context, sql).ToList();
DisplayContactListDetails(contactsList);
}
}
public static List<Contact> TestObjectContextExecuteStoreQuery(AdventureWorksContext context, string sql)
{
ObjectResult<Contact> contacts =
((IObjectContextAdapter)context).ObjectContext.ExecuteStoreQuery<Contact>(sql);
return contacts.ToList();
}
public static List<Contact> TestDbSetSqlQueryWithTransaction(AdventureWorksContext context, string sql)
{
List<Contact> contacts = context.Contacts.SqlQuery(sql).ToListReadUncommitted();
return contacts.ToList();
}
public static List<Contact> TestDbSetSqlQueryAsNoTracking(AdventureWorksContext context, string sql)
{
DbSqlQuery<Contact> contacts = context.Contacts.SqlQuery(sql).AsNoTracking();
return contacts.ToList();
}
public static List<Contact> TestDatabaseSqlQuery(AdventureWorksContext context, string sql)
{
DbRawSqlQuery<Contact> contacts = context.Database.SqlQuery<Contact>(sql);
return contacts.ToList();
}
public static void ShowSelect()
{
//Lazy load entity
using (var context = new AdventureWorksContext())
{
var products = context.Products
.Where(p => p.ProductSubcategory != null).Take(10)
.Select(p => p);
foreach (var p in products)
{
Console.WriteLine(p.ProductID);
if (p.ProductSubcategory != null)
{
Console.WriteLine(p.ProductSubcategory);
Console.WriteLine(p.ProductSubcategory.ProductCategoryID); // Causes an additional database hit
}
Console.WriteLine("----------------------------------------------");
}
}
Console.WriteLine("Press any key to continue...");
Console.ReadKey();
//Deep load entity
using (var context = new AdventureWorksContext())
{
var products = context.Products
.Include("ProductSubcategory")
.Where(p => p.ProductSubcategory != null).Take(10)
.Select(s => s);
foreach (var e in products)
{
Console.WriteLine(e.ProductID);
Console.WriteLine(e.ProductSubcategory.ProductCategoryID); // Does not cause an additional database hit
Console.WriteLine("----------------------------------------------");
}
}
Console.WriteLine("Press any key to continue...");
Console.ReadKey();
// ------------------------ Anonymous type EF queries ----------------------------------//
//Select with projection using anonymous type
using (var context = new AdventureWorksContext())
{
var products = context.Products.Where(p => p.ProductSubcategory != null).Take(10)
.Select(s => new { s.ProductID, s.Name });
foreach (var e in products)
{
Console.WriteLine(e.ProductID);
Console.WriteLine(e.Name); // Does not cause an additional database hit
Console.WriteLine("----------------------------------------------");
}
}
Console.WriteLine("Press any key to continue...");
Console.ReadKey();
//View paging behaviour
using (var context = new AdventureWorksContext())
{
var products = context.Products.OrderBy(o => o.ProductID)
.ToPagedList(50, 10); ;
foreach (var p in products)
{
Console.WriteLine(p.ProductID);
Console.WriteLine(p.ProductSubcategory);
Console.WriteLine(p.ProductSubcategory.ProductCategoryID); // Causes an additional database hit
Console.WriteLine("----------------------------------------------");
}
}
Console.WriteLine("Press any key to continue...");
Console.ReadKey();
}
