/// <summary>
/// Takes a bookUpdater and uses it to update the book record in the database.
/// </summary>
/// <param name="updater"></param>
public void UpdateBook(BookUpdater updater)
{
using (LibraryDBEntities context = new LibraryDBEntities())
{
Book book = (from b in context.Books
where b.BookID == updater.Book.BookID
select b).FirstOrDefault();
//Check the properties on the updater to see what fields need to be altered.
if (updater.ChangeNumberOfCopies)
{
book.NumberOfCopies = updater.Book.NumberOfCopies;
}
context.SaveChanges();
}
Sort();
}
/// <summary>
/// Finds the book in the database with the same BookID and matches the fields to the BookBLL passed in.
/// </summary>
/// <param name="updater"></param>
public void UpdateBookFields(BookUpdater updater)
{
//First check if a new author needs to be created
if (updater.AuthorBuilder != null)
{
AddAuthorToDatabase(updater);
}
using (LibraryDBEntities context = new LibraryDBEntities())
{
Book book = (from b in context.Books
where b.BookID == updater.Book.BookID
select b).FirstOrDefault();
//Update the fields of the book record to match any new data
if (updater.ChangeAuthorID)
{
if (updater.AuthorBuilder != null && updater.AuthorBuilder.IsNewPerson)
{
updater.AuthorID = updater.Book.AuthorID;
}
book.AuthorID = updater.AuthorID;
}
if (updater.ChangeTitle)
{
book.Title = updater.Title;
}
if (updater.ChangeISBN)
{
book.ISBN = updater.ISBN;
}
if (updater.ChangeLanguage)
{
book.Language = updater.Language;
}
if (updater.ChangeNumberOfCopies)
{
book.NumberOfCopies = updater.NumberOfCopies;
}
if (updater.ChangeNumPages)
{
book.NumPages = updater.NumPages;
}
if (updater.ChangePublisher)
{
book.Publisher = updater.Publisher;
}
if (updater.ChangeDescription)
{
book.Description = updater.Description;
}
if (updater.ChangeSubject)
{
book.Subject = updater.Subject;
}
if (updater.ChangeYearPublished)
{
book.YearPublished = updater.YearPublished;
}
context.SaveChanges();
}
updater.FinalizeChanges();
}
