BLL/BorrowBookBLL.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Model;
using DAL;
using System.Data;

namespace BLL
{
   public class BorrowBookBLL
    {
       #region//借书
       public bool BorrBook(BorrowBook borrBook)
       {
           BorrowBookDAL borrBookDAl = new BorrowBookDAL();
           BorrowerDAL borrowerDAL = new BorrowerDAL();
           Borrower model = borrowerDAL.BorrowerCheck(borrBook.BorrowerId);
           BookDAL bookDAL = new BookDAL ();
           BookDetail bookModel = bookDAL.bookCheck(borrBook.BookId);
           if (model != null)//判断借阅者是否存在
           {
               if (Convert.ToInt32(model.BookAccount) >= 5)
               {
                   throw new System.Exception("已达到最多借书量：5本，请确认！");
               }
               else {
                   //判断图书是否存在
                   if (bookModel != null)
                   {
                       //判断图书是否为已借出
                       if (bookModel.Status == "未借出")
                       {
                           return borrBookDAl.BorrBook(borrBook);
                       }
                       else
                       {
                           throw new System.Exception("该图书已借出，请确认！");
                       }
                   }
                   else
                   {
                       throw new System.Exception("该图书不存在，请确认！");
                   }     
               }                         
           }
           else {
               throw new System.Exception("该借阅者不存在，请确认！");
           }          
       }
       #endregion
       #region//还书
       public bool ReturnBook(BorrowBook borrBook)
       {
           BorrowBookDAL borrBookDAl = new BorrowBookDAL();
           if (borrBook.BorrowerId == "") {
               throw new System.Exception("请输入借阅者ID！");
           }
           else if (borrBook.BookId == "") {
               throw new System.Exception("请输入图书ID！");