/// <summary>
/// 转移图书
/// </summary>
/// <param name="model">借阅信息</param>
/// <param name="userId">当前借阅用户</param>
/// <returns>true or false</returns>
public bool Transfer(BorrowBookModel model, int userId)
{
if (model == null)
{
throw new InvalidOperationException("图书借阅信息无效。");
}
using (var dbContext = new MissionskyOAEntities())
{
//当前用户的借阅信息失效
var current =
dbContext.BookBorrows.FirstOrDefault(
it =>
it.BookId == model.BookId && it.UserId == userId &&
it.Status == (int)UserBorrowStatus.Borrowing);
if (current != null)
{
current.Status = (int)UserBorrowStatus.Returned;
}
//转移图书到其它用户
if (model.Reader.HasValue && DoBorrow(dbContext, model, model.Reader.Value))
{
dbContext.SaveChanges();
}
}
return(true);
}
public BorrowBookModel ShowBorrowBook(int BookID)
{
var Book = context.BorrowedBooks.Find(BookID);
BorrowBookModel NBook = new BorrowBookModel();
NBook.BorrowedBookID = Book.BorrowedBookID;
NBook.AutherName = Book.AutherName;
NBook.Title = Book.Title;
NBook.PublicherName = Book.PublicherName;
NBook.NumberOfPage = Book.NumberOfPage;
NBook.Image = Book.Image;
return(NBook);
}
public ApiResponse <bool> Transfer(BorrowBookModel model)
{
if (model == null)
{
throw new Exception("无效的借阅信息。");
}
var response = new ApiResponse <bool>()
{
Result = this.BookService.Transfer(model, this.Member.Id)
};
return(response);
}
/// <summary>
/// 借阅图书
/// </summary>
/// <param name="model">借阅信息</param>
/// <param name="userId">借阅用户</param>
/// <returns>true or false</returns>
public bool Borrow(BorrowBookModel model, int userId)
{
if (model == null)
{
throw new InvalidOperationException("图书借阅信息无效。");
}
using (var dbContext = new MissionskyOAEntities())
{
if (DoBorrow(dbContext, model, userId))
{
dbContext.SaveChanges();
}
}
return(true);
}
public Boolean PostForBorroweBook(BorrowBookModel book)
{
BorrowedBook Bbook = new BorrowedBook();
Bbook.Title = book.Title;
Bbook.AutherName = book.AutherName;
Bbook.PublicherName = book.PublicherName;
Bbook.NumberOfPage = book.NumberOfPage;
Bbook.Image = book.Image;
Bbook.TimeOfPost = DateTime.Now;
Bbook.Request = false;
Bbook.ISborrwed = false;
Bbook.UserID = null;
context.BorrowedBooks.Add(Bbook);
context.SaveChanges();
return(true);
}
/// <summary>
/// 借书
/// </summary>
/// <param name="dbContext">数据库上下文对象</param>
/// <param name="model">图书借阅信息</param>
/// <param name="userId">借阅用户</param>
/// <returns>是否借阅成功</returns>
private bool DoBorrow(MissionskyOAEntities dbContext, BorrowBookModel model, int userId)
{
if (model == null)
{
throw new InvalidOperationException("无效借阅信息");
}
if (model.ReturnDate.CompareTo(DateTime.Now) < 1)
{
throw new InvalidOperationException("归还日期必须大于当前日期");
}
bool isAllowBrrow = false;
if (model.BookId != null && model.BookId > 0)
{
var book = dbContext.Books.FirstOrDefault(it => it.Id == model.BookId);
if (book == null)
{
throw new InvalidOperationException("无此图书");
}
isAllowBrrow = AllowBorrow(book.ToModel());
book.Status = (int)BookStatus.Borrowed;
book.Reader = userId;
if (isAllowBrrow)
{
//借阅
var bookBorrow = new BookBorrow()
{
BookId = model.BookId,
UserId = userId,
BorrowDate = DateTime.Now,
ReturnDate = model.ReturnDate,
Status = (int)UserBorrowStatus.Borrowing
};
dbContext.BookBorrows.Add(bookBorrow);
dbContext.SaveChanges();
return(true);
}
}
if (!string.IsNullOrEmpty(model.BarCode))
{
var book = dbContext.Books.Where(it => !string.IsNullOrEmpty(it.BarCode) && it.BarCode.Equals(model.BarCode, StringComparison.InvariantCultureIgnoreCase)).FirstOrDefault();
if (book == null)
{
throw new InvalidOperationException("无此图书");
}
isAllowBrrow = AllowBorrow(book.ToModel());
book.Status = (int)BookStatus.Borrowed;
book.Reader = userId;
if (isAllowBrrow)
{
//借阅
var bookBorrow = new BookBorrow()
{
BookId = book.Id,
UserId = userId,
BorrowDate = DateTime.Now,
ReturnDate = model.ReturnDate,
Status = (int)UserBorrowStatus.Borrowing
};
dbContext.BookBorrows.Add(bookBorrow);
dbContext.SaveChanges();
return(true);
}
}
return(false);
}
