ASP.NET MVC 簡單事務

 //實例化查詢上下文
            using ( BookStoreEntities db = new  BookStoreEntities()) 
            {
                //找到需要價格和名稱的數據實體對象
                var book = db.Books.FirstOrDefault(x => x.Title == "ASP.NET NVC 程序開發");
                if(book!=null)
                {
                    //更改屬性值
                    book.Title = "ASP.NET NVC 程序開發";
                    book.Price = 30;
                    //保存更改,只有調用了SaveChannges()方法後,更新後的數據才能被寫入數據庫
                    db.SaveChanges();
                }
            }

            #region 使用事務新增
            using (BookStoreEntities db = new BookStoreEntities())
            {

                //聲明事務對象
                System.Data.Common.DbTransaction tran = null;

                //手動打開鏈接並創建事務
                db.Conection.Open();

                tran = db.Connection.BeginTransaction();
                try
                {
                    var book = db.Books.FirstOrDefault(x => x.Title == "JavaScript語言與AJAX應用");
                    var order = new Orders() { Num = 1, Books = book, Address = "" };
                    db.AddToOrders(order);
                    db.SaveChanges();
                    order.Address = "中國湖北武漢";
                    db.SaveChanges();

                    //提交事務
                    tran.Commit();
                }
                //如果出現任何異常事務回滾

                catch (Exception)
                {
                    tran.Rollback();
                }
                finally
                {
                    //關閉連接
                    if (db != null && db.Connection.State != System.Data.ConnectionState.Closed)
                    {
                        db.Connection.Close();
                    }
                }

            #endregion

ASP.NET MVC 簡單事務添加