public void AddBook(book newBook)
{
using (var dbModel = new LMSDataModelEntities())
{
dbModel.books.AddObject(newBook);
dbModel.ObjectStateManager.ChangeObjectState(newBook, System.Data.EntityState.Added);
var saveCount = dbModel.SaveChanges();
if (saveCount < 1)
{
throw new Exception("Fail to insert Book " + newBook.Title + " in to DB");
}
}
}
public void UpdateBook(book bookToUpdate)
{
using (var dbModel = new LMSDataModelEntities())
{
bookToUpdate.bookauthors = null;
bookToUpdate.department = null;
bookToUpdate.publisher = null;
bookToUpdate.studentbookloans = null;
bookToUpdate.systemuser = null;
dbModel.books.AddObject(bookToUpdate);
dbModel.ObjectStateManager.ChangeObjectState(bookToUpdate, System.Data.EntityState.Modified);
var saveCount = dbModel.SaveChanges();
if (saveCount < 1)
{
throw new Exception("Fail to Update Book " + bookToUpdate.Title + "in DB");
}
}
}
private void Fixupbook(book previousValue)
{
if (previousValue != null && previousValue.studentbookloans.Contains(this))
{
previousValue.studentbookloans.Remove(this);
}
if (book != null)
{
if (!book.studentbookloans.Contains(this))
{
book.studentbookloans.Add(this);
}
if (BookId != book.Id)
{
BookId = book.Id;
}
}
}