/// <summary>
/// Method to get all the stored books
/// </summary>
/// <returns>list of books</returns>
public List <bookinfo> GetAllBooks()
{
using (var db = new BooksEntities())
{
return(db.bookinfoes.ToList());
}
}
/// <summary>
/// Method to get a book on the basis of the Book ID
/// </summary>
/// <param name="id"></param>
/// <returns> the book details of the given book id</returns>
public bookinfo GetBook(string id)
{
int Id = Convert.ToInt32(id);
using (var db = new BooksEntities())
{
bookinfo book = db.bookinfoes.SingleOrDefault(b => b.Id == Id);
// If book with given id does not exist throw exception
if (book == null)
{
ErrorMessages customError = new ErrorMessages("Book not found", "Book with the given Id does not exists");
throw new WebFaultException <ErrorMessages>(customError, HttpStatusCode.NotFound);
}
return(book);
}
}
/// <summary>
/// Implementing Method to update the book
/// </summary>
/// <param name="book"></param>
/// <returns>bolean value</returns>
public bool UpdateBook(bookinfo book)
{
using (var db = new BooksEntities())
{
bookinfo selectbook = db.bookinfoes.SingleOrDefault(b => b.Id == book.Id);
// If book with given id does not exist throw exception
if (selectbook == null)
{
ErrorMessages customError = new ErrorMessages("Book can not be updated", "Book with the given Id does not exist");
throw new WebFaultException <ErrorMessages>(customError, HttpStatusCode.NotFound);
}
selectbook.Id = book.Id;
selectbook.Title = book.Title;
selectbook.Description = book.Description;
db.SaveChanges();
return(true);
}
}
/// <summary>
/// Implementing Method to delete a book on he basis of book ID
/// </summary>
/// <param name="id"></param>
/// <returns>string id</returns>
public string DeleteBook(string id)
{
int Id = Convert.ToInt32(id);
using (var db = new BooksEntities())
{
bookinfo book = db.bookinfoes.SingleOrDefault(b => b.Id == Id);
// If book with given id does not exist throw exception
if (book == null)
{
ErrorMessages customError = new ErrorMessages("Book can not be deleted", "Book with the given Id does not exist");
throw new WebFaultException <ErrorMessages>(customError, HttpStatusCode.NotFound);
}
db.bookinfoes.Remove(book);
db.SaveChanges();
return(id);
}
}
/// <summary>
/// Implementing Method to add the book
/// </summary>
/// <param name="book"></param>
/// <returns> ID of th added book</returns>
public int AddBook(bookinfo book)
{
if (string.IsNullOrEmpty(book.Id.ToString()))
{
ErrorMessages customError = new ErrorMessages("Book can not be added",
"The given book data Id is null or empty");
throw new WebFaultException <ErrorMessages>(customError, HttpStatusCode.NotFound);
}
using (var db = new BooksEntities())
{
bookinfo selectbook = db.bookinfoes.SingleOrDefault(b => b.Id == book.Id);
// check if the book with this id already exists as duplicates are not allowed
if (selectbook != null)
{
ErrorMessages customError = new ErrorMessages("Book can not be added", "A book with this Id already exists.");
throw new WebFaultException <ErrorMessages>(customError, HttpStatusCode.NotFound);
}
db.bookinfoes.Add(book);
db.SaveChanges();
return(book.Id);
}
}