public bool AddOrder(Guid memberGUID, List <OrderDetail> items)
{
bool _IsSaveOK = false;
bool _AddOrderResult = false;
bool _hasStorage = false;
var _log = new EventLog();
var _productInstance = this._unitOfWork.ProductRepository;
var _orderInstance = this._unitOfWork.OrderRepository;
var _stopwatch = new Stopwatch();
_log.MemberGUID = memberGUID;
_log.Retry = 0;
_log.EventDateTime = DateTime.Now;
//判斷商品庫存：沒有庫存的話就不進行新增訂單
ProductStorage _productStorage;
ProductMain _productMain;
_stopwatch.Reset();
_stopwatch.Start();
foreach (var item in items)
{
_productStorage = _productInstance.GetProductStorageById(item.ProductNo);
_productMain = _productInstance.GetProductById(item.ProductNo);
_log.ProductName = _productMain.Name;
_log.ProductSchema = _productMain.Schema;
_log.Quantity = item.Quantity;
_log.OrginalStorage = _productStorage.Storage;
_productStorage.Storage = Convert.ToInt16(_productStorage.Storage.Value - item.Quantity.Value);
if (_productStorage.Storage >= 0)
{
_hasStorage = true;
}
if (_hasStorage == true)
{
break;
}
}
if (_hasStorage == false)
{
return(false);
}
//取得訂單序號與訂單編號
int _mainSeq, _schemaSeq;
string _orderSchema;
_mainSeq = _orderInstance.GetOrderMainSeq();
_schemaSeq = _orderInstance.GetOrderSchemaSeq();
_orderSchema = String.Format("{0:yyyyMMdd}{1,7}", DateTime.Now, _schemaSeq);
_orderSchema = _orderSchema.Replace(" ", "0");
//建立訂單
OrderMain _orderMain;
OrderDetail _orderDetail;
_orderMain = new OrderMain();
_orderMain.No = _mainSeq;
_orderMain.Schema = _orderSchema;
_orderMain.OrderDate = DateTime.Now;
_orderMain.MemberGUID = memberGUID;
_orderMain.IsDeleted = false;
this._unitOfWork.OrderRepository.InsertOrderMain(_orderMain);
foreach (var item in items)
{
_orderDetail = new OrderDetail();
_orderDetail.OrderNo = _mainSeq;
_orderDetail.ProductNo = item.ProductNo;
_orderDetail.SellPrice = item.SellPrice;
_orderDetail.Quantity = item.Quantity;
this._unitOfWork.OrderRepository.InsertOrderDetail(_orderDetail);
}
/*
* 此區塊程式碼參考至下列 Github
* https://github.com/aspnet/EntityFramework.Docs/blob/master/samples/core/Saving/Saving/Concurrency/Sample.cs
*/
while (_IsSaveOK == false)
{
try
{
_log.Retry = (_log.Retry + 1);
this._unitOfWork.Save();
_IsSaveOK = true;
_AddOrderResult = true;
}
catch (DbUpdateConcurrencyException ex)
{
int _ProductNo = (-1);
//取得 ProductStorage 庫存物件清單並進行更新
foreach (var entry in ex.Entries)
{
if (entry.Entity is ProductStorage)
{
var proposedValues = entry.CurrentValues;
var databaseValues = entry.GetDatabaseValues();
foreach (var property in proposedValues.Properties)
{
var proposedValue = proposedValues[property];
var databaseValue = databaseValues[property];
if (string.Equals("ProductNo", property.Name, _comparison) == true)
{
_ProductNo = Convert.ToInt32(proposedValue);
}
if (string.Equals("Storage", property.Name, _comparison) == true)
{
short _storage;
short _storageUpdated;
//取得要購買的庫存量
var _match = items.Where(x => x.ProductNo == _ProductNo).FirstOrDefault();
if (_match == null)
{
_IsSaveOK = true;
break;
}
//重新取得當下資料庫儲存的庫存量並進行更新
_storage = Convert.ToInt16(databaseValue);
_storageUpdated = Convert.ToInt16(_storage - _match.Quantity);
if (_storageUpdated >= 0)
{
proposedValues[property] = _storageUpdated;
databaseValues[property] = _storage;
}
else
{
_IsSaveOK = true;
break;
}
}
}
entry.OriginalValues.SetValues(databaseValues);
}
else
{
throw new NotSupportedException(
"Don't know how to handle concurrency conflicts for "
+ entry.Metadata.Name);
}
}
}
catch (Exception ex)
{
Console.WriteLine(ex.GetType().Name);
break;
}
}
_stopwatch.Stop();
_log.Elapsed = Convert.ToInt32(_stopwatch.ElapsedMilliseconds);
_log.IsSuccess = _AddOrderResult;
//儲存事件紀錄
using (UnitOfWork _work = new UnitOfWork())
{
_work.EventLogRepository.InsertEventLog(_log);
_work.Save();
}
return(_AddOrderResult);
}
public void InsertOrderMain(OrderMain orderMain)
{
this._context.OrderMains.Add(orderMain);
}
