static void NoMoreSorrow()
{
using (BestLibraryEntities db = new BestLibraryEntities())
{
foreach (var item in db.Customers)
{
item.IsDebtor = false;
}
db.SaveChanges();
}
}
static void ShowDebtors()
{
using (BestLibraryEntities db = new BestLibraryEntities())
{
Console.WriteLine("--------------- Debtors ---------------");
var debtors = db.Customers.Where(c => c.IsDebtor == true);
foreach (var item in debtors)
{
Console.WriteLine($"{item.FirstName} {item.LastName}");
}
}
}
static void ShowAvaliableBooks()
{
using (BestLibraryEntities db = new BestLibraryEntities())
{
Console.WriteLine("--------------- Avaliable Books ---------------");
var a_books = db.BooksInLibrary
.Join(db.Books, b => b.Id_book, e => e.Id, (b, e) => new { Title = e.Title, idc = b.Id_customer })
.Where(a => a.idc == null);
foreach (var item in a_books)
{
Console.WriteLine(item.Title);
}
}
}
static void ShowTakedBooks()
{
using (BestLibraryEntities db = new BestLibraryEntities())
{
Console.WriteLine("--------------- Taked Books ---------------");
var book = db.BooksInLibrary
.Join(db.Books, b => b.Id_book, e => e.Id, (b, e) => new { Title = e.Title, idc = b.Id_customer })
.Join(db.Customers, x => x.idc, y => y.Id, (b, x) => new { idc = x.Id, Title = b.Title })
.Where(p => p.idc == 2);
foreach (var item in book)
{
Console.WriteLine(item.Title);
}
}
}
static void ShowAuthors()
{
using (BestLibraryEntities db = new BestLibraryEntities())
{
Console.WriteLine("--------------- Authors ---------------");
var authors = from a in db.BooksInLibrary
join b in db.Authors on
a.Id_author equals b.Id
where a.Id_book == 3
select new { FN = b.FirstName, LN = b.LastName };
foreach (var item in authors)
{
Console.WriteLine($"{item.FN} {item.LN}");
}
}
}