更新通過LINQ在不同的數據庫

Question

我有一個數據庫，它看起來像這樣：

1：

CommissionsV2（表= Entity_Product_Point）
這是我的DBML過它只有一個表。

第二：

WebEnroll（表= PlanMaster）
這是我的另一個DBML具有一個表中它。

現在通過LINQ我加入這一行其中有這樣的查詢：

     CommissionsV2DataContext cv = new CommissionsV2DataContext(); 
         Entity_Product_Point ev = new Entity_Product_Point(); 
         ev.Entity_ID = getEntity; 
         ev.Product_ID = tr.First(); 
         ev.HiCommissionOld = (double)firststYrComp; 
         ev.LowCommissionOld = (double)recurringComp; 
         ev.HiCommission = (double)finalFirstYrComp * 100; 
         ev.LowCommission = (double)finalRecurringComp * 100; 
         ev.DateCreated = System.DateTime.Now; 

         cv.Entity_Product_Points.InsertOnSubmit(ev); 
         cv.SubmitChanges(); 

現在我的更新語句是這樣的：

protected void gvShowComm_RowUpdating(object sender, GridViewUpdateEventArgs e) 
    { 

     //Getting the Entity_ID from the Session! 
     int getEntity = Int16.Parse(Session["EntitySelected"].ToString()); 

     //Accessing the variables from the controls! 
     System.Web.UI.WebControls.TextBox product_ID = gvShowComm.Rows[e.RowIndex].FindControl("ProductName") as System.Web.UI.WebControls.TextBox; 
     System.Web.UI.WebControls.TextBox planName = gvShowComm.Rows[e.RowIndex].FindControl("PlanName") as System.Web.UI.WebControls.TextBox; 
     System.Web.UI.WebControls.TextBox hiCommOld = gvShowComm.Rows[e.RowIndex].FindControl("HiComm") as System.Web.UI.WebControls.TextBox; 
     System.Web.UI.WebControls.TextBox lowCommOld = gvShowComm.Rows[e.RowIndex].FindControl("LowComm") as System.Web.UI.WebControls.TextBox; 

     //Storing the values into variables! 
     int product = Int16.Parse(product_ID.Text); 
     string plan = planName.Text; 
     int hiOld = Int16.Parse(hiCommOld.Text); 
     int lowOld = Int16.Parse(lowCommOld.Text); 

     //Updating the values into the table through LINQ! 
     dbWebEnrollDataContext dt = new dbWebEnrollDataContext(); //This has PlanName in PlanMaster Table. 
     CommissionsV2DataContext cv = new CommissionsV2DataContext(); //Entity_Product_Point has all the other columns which needs to be updated! 

     Entity_Product_Point ev = cv.Entity_Product_Points.Single(c => c.Product_ID == product); 
     ev.HiCommissionOld = hiOld; 
     ev.LowCommissionOld = lowOld; 
     ev.Entity_ID = getEntity; 
     cv.SubmitChanges(); 

Answer 1

爲了更新，您需要檢索需要更新的實體。

所以你的情況這將是：

Entity_Product_Point ev = cv.Entity_Product_Points.Single(c => c.Product_ID == product); 
ev.HiCommissionOld = hiOld; 
ev.LowCommissionOld = lowOld; 
// Retrieve the plan that needs to be updated and set the name 
// Submit the changes 
cv.SubmitChanges(); 
// Retrieve the new values and rebind the gridview against the new values