static void CopyToDatabase(GreenContext context)
{
Repository repo = new Repository();
context.Groups.AddRange(repo.Groups);
context.Students.AddRange(repo.Students);
context.SaveChanges();
}
static void FilterAndOrder(GreenContext context)
{
var result = from s in context.Students
where s.BirthDate.Year >= 1999
orderby s.Rating descending, s.Name
select s;
foreach (var s in result)
{
Console.WriteLine("{0} {1}: {2}", s.Name, s.Surname, s.Rating);
}
}
static void Main(string[] args)
{
using (GreenContext c = new GreenContext())
{
// Uncomment and run once to fill the database
// CopyToDatabase(c);
// Queries
//FilterAndOrder(c);
//GroupByFirstLetter(c);
Join(c);
}
Console.ReadKey();
}
static void GroupByFirstLetter(GreenContext context)
{
var result = from s in context.Students
group s by s.Name.Substring(0, 1) into g
select g;
foreach (var group in result)
{
Console.WriteLine("\nFirst letter: {0}", group.Key);
foreach (var s in group)
{
Console.WriteLine("{0} {1}", s.Name, s.Surname);
}
}
}
static void Join(GreenContext context)
{
var result = from s in context.Students
join g in context.Groups
on s.GroupId equals g.Id
select new StudentViewModel
{
FullName = s.Name + " " + s.Surname,
Rating = s.Rating,
GroupName = g.Name
};
foreach (var s in result)
{
Console.WriteLine("{0} ({1}): rating = {2}", s.FullName, s.GroupName, s.Rating);
}
}