private static void Main(string[] args)
{
using(var context = new TelerikAcademyEntities())
{
NonOptimizedEmployeeQuery(context);
OptimizedEmployeeQuery(context);
}
}
private static void Main()
{
using (var context = new TelerikAcademyEntities())
{
StringBuilder container = new StringBuilder();
AnonymusVariable(context, container);
SeparateCalls(context, container);
IncludeUsing(context, container);
}
}
private static void OptimizedEmployeeQuery(TelerikAcademyEntities context)
{
Console.WriteLine("Employees:");
var employeesInSofia = context.Employees
.Where(e => e.Address.Town.Name == "Sofia")
.Select(e => e.FirstName + " " + e.MiddleName + " " + e.LastName);
foreach (var employee in employeesInSofia)
{
Console.WriteLine("{0}", string.Join(", ", employee));
}
}
private static void NonOptimizedEmployeeQuery(TelerikAcademyEntities context)
{
var employees = context.Employees.ToList();
var addresses = employees.Select(e => e.Address).ToList();
var towns = addresses.Select(a => a.Town).ToList();
var sofiaTownId = towns.Where(t => t.Name.ToLowerInvariant() == "Sofia".ToLowerInvariant()).First().TownID;
Console.WriteLine("Employees:");
foreach (var employee in employees.Where(e => e.Address.TownID == sofiaTownId).Select(e => e.FirstName + " " + e.MiddleName + " " + e.LastName))
{
Console.WriteLine("{0}", string.Join(", ",employee));
}
}
private static void IncludeUsing(TelerikAcademyEntities context, StringBuilder container)
{
Console.WriteLine("Include:");
var employeesWithTown = context.Employees.Include("Department").Include("Address.Town");
foreach (var includedEmployee in employeesWithTown)
{
container.Append("Name: ").Append(includedEmployee.FirstName).Append(' ').Append(includedEmployee.MiddleName).Append(' ').AppendLine(includedEmployee.LastName);
container.Append("Department: ").AppendLine(includedEmployee.Department.Name);
container.Append("Town: ").AppendLine(includedEmployee.Address.Town.Name);
container.AppendLine(new string('-', 50));
}
Console.WriteLine(container);
container.Clear();
}
private static void SeparateCalls(TelerikAcademyEntities context, StringBuilder container)
{
Console.WriteLine("Separate: ");
foreach (var separateEmployee in context.Employees)
{
container.Append("Name: ").Append(separateEmployee.FirstName).Append(' ').Append(separateEmployee.MiddleName).Append(' ').AppendLine(separateEmployee.LastName);
container.Append("Department: ").AppendLine(separateEmployee.Department.Name);
container.Append("Town: ").AppendLine(separateEmployee.Address.Town.Name);
container.AppendLine(new string('-', 50));
}
Console.WriteLine(container);
container.Clear();
Console.WriteLine("Press any key to continue...");
Console.ReadKey();
}
private static void AnonymusVariable(TelerikAcademyEntities context, StringBuilder container)
{
var extractedEmployees = context.Employees.Select(employee => new
{
Name = employee.FirstName + " " + (employee.MiddleName == null ? string.Empty : employee.MiddleName) + " " + employee.LastName,
Department = employee.Department.Name,
Town = employee.Address.Town.Name
});
foreach (var extractedEmployee in extractedEmployees)
{
container.Append("Name: ").AppendLine(extractedEmployee.Name);
container.Append("Department: ").AppendLine(extractedEmployee.Department);
container.Append("Town: ").AppendLine(extractedEmployee.Town);
container.AppendLine(new string('-', 50));
}
Console.WriteLine(container);
container.Clear();
Console.WriteLine("Press any key to continue...");
Console.ReadKey();
}
