Question

您好我需要插入采购订单标题和详细信息。现在将数据插入PurchaseOrder表是成功的，但是当我尝试将数据插入PurchaseOrderDetails时，它将数据插入到许多不同的表中。我试过调试它，但我没有发现问题。我还检查了SQL Profiler，我发现EF正在向ff表中插入数据“ NewProposal，机构，产品，等等。

请帮帮我，如何防止EF将数据插入到其他表中，我只需要EF将数据插入到PO和POdetails表中。

这是我的采购订单模型：

public class PurchaseOrder
{
    [Key]
    public int PurchaseOrderID {get; set;}

    [Required]
    public string PurchaseOrderNo { get; set; }

    [Required]
    public DateTime PurchaseOrderDate { get; set; }

    public DateTime DateCreated { get; set; }

    public DateTime DateModified { get; set; }

    public bool isDraft { get; set; }

    public int? InstitutionID { get; set; }

    public virtual Institution Institution { get; set; }

    [Required]
    public DateTime ReceivedDate { get; set; }

    public string Remarks { get; set; }

    public List<PODetail> PODetail { get; set; }

}

以下是采购订单明细模型：

public class PODetail
{
    [Key]
    public int ID { get; set; }


    public virtual PurchaseOrder PurchaseOrder { get; set; }

    public virtual ULIV.ViewModels.NewProposal Proposal { get; set; }


    public DateTime DateCreated { get; set; }

    public DateTime DateModified { get; set; }

    public bool isDraft { get; set; }

}

供您参考，这是NewProposal VM：

public class NewProposal
{
    [Key]
    [Display(Name="Proposal ID")]
    public int ProposalID { get; set; }

    public int InstitutionID { get; set; }
    [ForeignKey("InstitutionID")]
    public virtual Institution Institution { get; set; }

    public string ProposalCode { get; set; }


    [Display(Name = "Proposed Unit Price")]
    ///[Required]
    public decimal ProposedUnitPrice { get; set; }

    ///[Required]
    [Display(Name = "Proposed Volume")]
    public string ProposedVolume { get; set; }

    public string Remarks { get; set; }

    public int StatusID { get; set; }
    public virtual Status Status { get; set; }

    public int VaccineTypeID { get; set; }
    public virtual VaccineType VaccineType { get; set; }


    public int ProductID { get; set; }
    public virtual ProductModel Product {get; set;}


    public DateTime DateModified { get; set; }


    public DateTime DateCreated { get; set; }

    public decimal FinalUnitPrice { get; set; }
    public decimal FinalVolume { get; set; }

    public decimal FinalTotalAmount { get; set; }

    public string RelatedProposalCode { get; set; }

    //public List<PODetail> PODetail { get; set; }

    public string getdatestring
    {
        get {
            return DateModified.ToShortDateString();
        }
    }

    public bool isDraft { get; set; }

    public int UserID { get; set; }

    public string DateDisplay { get; set; }
}

最后，这是用于保存采购订单的创建操作：

[HttpPost]
public ActionResult Create(PurchaseOrderViewModel purchaseorderviewmodel)
    {

        Session["PurchaseOrderNo"] = purchaseorderviewmodel.PurchaseOrderNo;

        purchaseorderviewmodel.AddedProposal  = (List<ULIV.ViewModels.NewProposal>)Session["AddedProposal"];


        int instituionId = Convert.ToInt32(Session["InstitutionID"]);          

        purchaseorderviewmodel.isDraft = true;

        purchaseorderviewmodel.DateCreated = DateTime.Now;

        purchaseorderviewmodel.DateModified = DateTime.Now;


        if (ModelState.IsValid)
        {

            try
            {
                ULIV.Models.PurchaseOrder newPO = new PurchaseOrder();
                newPO.Institution = db.Institutions.Find(instituionId);
                newPO.PurchaseOrderNo = purchaseorderviewmodel.PurchaseOrderNo;
                newPO.PurchaseOrderDate = purchaseorderviewmodel.PurchaseOrderDate;
                newPO.ReceivedDate = purchaseorderviewmodel.ReceivedDate;
                newPO.Remarks = purchaseorderviewmodel.Remarks;
                //newPO.Institution = 
                newPO.DateCreated = DateTime.Now;
                newPO.DateModified = DateTime.Now;
                newPO.isDraft = true;
                db.PurchaseOrders.Add(newPO);
                db.SaveChanges();

                var query = (from m in db.PurchaseOrders orderby m.PurchaseOrderID descending select m).Take(1).ToList();


                foreach (var d in purchaseorderviewmodel.AddedProposal)
                {
                    PODetail newPODetail = new PODetail();


                    foreach (var i in query)
                    {
                        newPODetail.PurchaseOrder = i;

                    }


                    newPODetail.Proposal = d;
                    newPODetail.DateCreated = DateTime.Now;
                    newPODetail.DateModified = DateTime.Now;
                    newPODetail.isDraft = true;

                    db.PODetails.Add(newPODetail);
                    db.SaveChanges();
                }
            }
            catch (DbEntityValidationException dbEx)
            {
                foreach (var validationErrors in dbEx.EntityValidationErrors)
                {
                    foreach (var validationError in validationErrors.ValidationErrors)
                    {
                        Trace.TraceInformation("Property: {0} Error: {1}", validationError.PropertyName, validationError.ErrorMessage);
                    }
                }
            }


            Session["AddedProposal"] = null;


            return RedirectToAction("Index","Fulfillment");
        }


        ViewBag.Proposal = new SelectList(db.NewProposal.Where(x => x.Status.StatusID == 3), "ProposalID", "ProposalCode");
        return View(purchaseorderviewmodel);
    }

Answer 1

你这样做：

newPODetail.Proposal = d;

d成为ViewModel的一部分。这意味着您将Proposal设置为不是来自DbContext的实例。因此，EF认为这是一个新事物（因为它不知道它）并且插入。

你可以做的是使用Proposal或类似的东西从DbContext找到实际的db.Proposals.Find(d.Id)，或者使用db.Attach(d)将对象附加到当前{ {1}}。

有关附加的更多信息：http://msdn.microsoft.com/en-us/library/system.data.entity.dbset.attach%28v=vs.103%29.aspx

实体框架问题，插入许多不同的表

1 个答案: