public void GetAllBooks1()
{
var books = new Database("product").ExecuteReader("select * from Book", null, dr => {
var book = new Book {Id = (int) dr["Id"], Name = (string) dr["Name"]};
return book;
});
foreach (var book in books)
Console.WriteLine(book.Name);
}
private static Book AddBook(string title, string description, DateTime datePublished, int pages, string isbn, int bookCopies)
{
using (BookDBDataContext context = new BookDBDataContext())
{
Book newBook = new Book()
{
Title = title,
BookResume = description,
DatePublished = datePublished,
Pages = pages,
ISBN = isbn
};
context.Books.InsertOnSubmit(newBook);
while (bookCopies > 0)
{
var bookCopy = new BookCopy()
{
Book = newBook
};
context.BookCopies.InsertOnSubmit(bookCopy);
bookCopies--;
}
//var existing = context.Authors.FirstOrDefault(a => a.FirstName.Contains("G"));
//if (existing != null)
//{
// var bookAuthor = new BookAuthor()
// {
// BookID = newBook.ID,
// AuthorID = existing.ID
// };
//}
//var bookGenre = new BookGenre()
//{
// BookID = newBook.ID
//};
context.SubmitChanges();
return newBook;
}
}
public static void LoanBookToUser(User user, Book book)
{
using (var context = new BookDBDataContext())
{
bool alreadyLoaned = (from bu in context.BookUsers
where bu.UserID == user.ID
&& bu.BookCopy.Book.ID == book.ID
&& bu.ReturnDate >= DateTime.Now.Date
select 1).Count() > 0;
if (alreadyLoaned == true)
{
throw new ArgumentException("You have already loaned this book!");
}
BookCopy availableCopy = (from bu in context.BookUsers
where bu.BookCopy.BookID == book.ID
&& bu.ReturnDate == null
select bu.BookCopy).FirstOrDefault();
var avail = (from bc in context.BookCopies
where bc.BookID == book.ID
&& bc.BookUsers.Count() == 0
select bc).FirstOrDefault();
if (availableCopy == null)
{
throw new ArgumentException("There is no available copy of this book!");
}
}
}
partial void DeleteBook(Book instance);
partial void UpdateBook(Book instance);
partial void InsertBook(Book instance);
