public bool Delete(int id)
{
var item = dbContext.Books.Include(b => b.Id == id);
dbContext.Entry(item).State = EntityState.Deleted;
try
{
dbContext.SaveChanges();
return(true);
}
catch (DbUpdateConcurrencyException)
{
return(false);
}
}
public bool Add(BorrowBook borrowBook)
{
try
{
dbContext.BorrowBooks.Add(borrowBook);
var book = dbContext.Books.SingleOrDefault(b => b.Id == borrowBook.BookId);
if (book != null)
{
if (book.AvailableNumber > 0)
{
book.AvailableNumber--;
}
else
{
return(false);
}
}
dbContext.SaveChanges();
return(true);
}
catch (Exception ex)
{
return(false);
}
}
public bool Add(Borrower borrower)
{
try
{
dbContext.Borrowers.Add(borrower);
dbContext.SaveChanges();
return(true);
}
catch (DbUpdateConcurrencyException)
{
return(false);
}
}