ADO.NET :: Get The Entity Designer To Properly Update Database Changes?
Jul 26, 2010
I recently encountered an annoying problem, and was wondering how to get around it:
I had three tables in my .edmx designer. Two of the tables, A and B, had a 1:many relationship (A:B). The third table, C, had no relationship defined, because I forgot. I added a new many:many relationship from B:C at the database level. I then right clicked and updated my Entity model, and attempted to compile, encountering a 3034 exception:
Problem in Mapping Fragments starting at lines 177, 192:
How do you delete more than one entity at the same time in the designer Entities list. it seems that the designer interface only allows the selection of 1 entity at a time....
I have an EDM, it includes the entities extension and history. My goal is to use history to keep track of all the changes made to extension entity. For example, if extension with ID 223 has its property 'Name_Display' changed - I want the history entity to record this.
I'm using ASP.NET with VB.NET. Where in my code do I put the hook to say, "update the history entity" and what should that hook look like?
I'm working on a new project where I have the luxury of working from a Model to Database approach using Entity Framework 4.
The project I'm working on is taking an agile approach where different phases will be rolled out over time.
Will the Model First approach work in my case? I noticed when you "Generate Database from Model" it recreates the entire schema from scratch which will obviously wipe all the data that is in the db. I was hoping for a more "Update Database from Model" approach where the db would just be altered to reflect the changes rather than recreated
I am mapping a stored procedure to an entity by right clicking on the entity (in the .edmx) and selecting "Stored Procedure Mapping." This brings you to a Mapping Details - "Name of Entity" Window that allows you to select the insert, update, and delete stored procedures associated with the Entity. It also maps the stored procedure parameter to the Entity "Property" (Column).
I'm gettin an error "error 2042: Parameter Mapping specified is not valid." The cause of the error is fairly obvious, in the Insert stored procedure that has been selected, a 'CHAR' parameter is being mapped to an Int32 Entity Property. I altered the stored procedure parameter to match the entity, I deleted the stored procedure, readded, and reslected it as the Insert function. I also cleaned, validated, updated model from database. No matter what I do, the parameter list in the mapping details doesn't reflect the change to the stored procedure. It's stuck on a char --> int32 mapping, even though it has been changed, like it's buried deep in meta data some where.
I'm writing a custom .NET MembershipProvider (not the built in one) and trying to update using Entity Framework. But of course i have no access to (Try)UpdateModel. How can i update it?
I've a problem with my Visual Studio.On the 13th of August 2010 i installed a Windows update on my vista sp2 pc. For this date my Visual Studio 2008 sp 1 always has closed itself by opening an aspx-page in designer view. There is no error message just closing the window. I restored a backup of my windows from the time before updating it and it helped, i could open aspx pages in the design view till the update has been installed again automatically after rebooting the pc. I can't disable windows updates, cause it's my pc at work and safety is very important.
I developed my application form in aspx page its such a huge form(6000 lines), I used update progress there for that updatepanel, But i cant able to see the update progress icon when i rendering the page.
I'm working on a simple demo project so that I can learn some things about ASP.NET's AJAX capabilities. My problem is that I can't seem to get an UpdatePanel to work properly with a CheckBox inside of it. Here is the markup I'm using in my .aspx file:
I am experiencing problems with the Ajax Update Progress control.
My application is about writing some comments and uploading a picture and when the picture is the process of being uploaded I would like to show an update progress. This is my code:
[Code]....
- when the button is clicked I see the update progress message for a couple of seconds but the picture and the text are not uploaded- I need to click the button again in order to see my picture and text uploaded but in this instance I don't see the update progress message.
I have the below code in my project..however its giving me an error on the update(bolded line)..please help me on this..
Private Sub ChangePassword1_ChangedPassword(ByVal sender As Object, ByVal e As System.EventArgs) Handles ChangePassword1.ChangedPassword lblTempPassword.Text = ChangePassword1.NewPassword.ToString CustomerName.Text = CType(Session("UserName"), String) Dim FV1Updobjconn As Data.SqlClient.SqlConnection FV1Updobjconn = New Data.SqlClient.SqlConnection() FV1Updobjconn.ConnectionString = ConfigurationManager.ConnectionStrings("ASPNETDBconnectionString1").ConnectionString FV1Updobjconn.Open() Dim dtUpdating As New Data.DataTable() Dim sqlUpdating As String = "UPDATE [SuperAdmin] SET [TempPasswd]= @SU2TempPasswd, [TempPwd]=@CU2TempPwd WHERE ([CustomerName] = [@CU2CustomerName])" Dim cmdUpdating As New Data.SqlClient.SqlCommand(sqlUpdating, FV1Updobjconn) cmdUpdating.Parameters.AddWithValue("@SU2UserId", UserIDValue.Text) cmdUpdating.Parameters.AddWithValue("@SU2TempPasswd", lblTempPassword.Text) cmdUpdating.Parameters.AddWithValue("@CU2TempPwd", False) cmdUpdating.ExecuteNonQuery().... I get an error here saying..INVALID COLUMN "CU2CustomerName" ' Dim adUpdating As New Data.SqlClient.SqlDataAdapter(cmdUpdating) ' adUpdating.Fill(dtUpdating) ' Get the values needed to be passed on ' CtSUCompanyName.Text = dtUpdating.Rows(0)("CompanyName").ToString() ' CtSUCatPurch.Text = dtUpdating.Rows(0)("CategoriesPurchases").ToString() FV1Updobjconn.Close() End Sub
I have one button on my page. On click of this I need to run four methods parallely in four saperate thead and need to show the progress bar for each method. Also need to update the label controls form those threaded methods.
Also I need to user Update panel of AJAX control tool kit to avoid post back to user.
I have used the read pool for that. When I remove the update panel the code works fine and update four labels but when I put the update panel it is not updating the labels.
It was recommended to us jQuery to resolve some of the issues that I am having. I have been trying to incorporate jQuery but it is not functioning properly. First I have a template:
I have a simple Textbox for entering password and the checkbox named Show passowrd beside it. Textbox mode is Password by default. These controls are in the table and I am using Update panel on top of the table. My application framework is 2.0 and I am Using ASP.NET 2.0 AJAX Extensions.
Now When i write some text in the textbox and check the Showpassword chekbox then the checkbox event is not getting fired. when Second time i click it then the event is fired and text in the textbox is removed and the textbox mode is set to the SingleLine. This functionality I am achieving by writing a code in the CS File.
When I remove the Update panel then the event is fired correctly everytime, but when usign Update panel and some text in the textbox then i have to check the checkbox twice for the desired functionality.
I want to display Chinese character in text box in Ajax Update Panel. But now i am getting error message as below.
Webpage error details
User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.2; OfficeLiveConnector.1.3; OfficeLivePatch.0.0)
Timestamp: Sat, 5 Jun 2010 13:12:18 UTC
Message: Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed. Common causes for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules, or server trace is enabled.
I am using EF4 with POCO entities and having problems to update an existing item. In a webbapp I have an ajax function fetching an entity object from the database through EF4. Then i make some changes to it and when I try to update the record in the database I call the Attach-method but it is not saved. I guess this has something do with that I am not in the same context anymore...so my question is how to make an update of a previously fetched record if the context which was used to fetch record is disposed?
I have following problem: in the Controller I call TryUpdateModel to send the changes made in the form back to the database. Then I save the entity, but no changes to database are made.
Here is the code from Controller:
[Code]....
Then the changes made to database. (ChangingSet have then also pending changes).
I have been updating my Entity Framework by simply right clicking and clicking on "update model from database". I usually go under the "Add" tab and then click the tables and click finish. I also use "refresh" sometimes as well. What are the differences between these? and also when I do refresh or add sometimes the entity comes out wrong or keeps some of the old information in cache, how can I just get the entity to match my database and clean out any of the old cached things.
I have an entity generated from my database that contains one table. When i make changes in the DB i obviously would like these changes to reflected in my model.
My current approach is to delete the item from the designer and then right-click - update model from database. This works for me at the moment. Is there a different approach to refreshing these entity tables ?
How can I update an existing LINQ entity? This code gives me: "Cannot insert an entity that already exists." Any better practises on updating/inserting with linq?
foreach (ListViewItem lvi in lvStudents.Items) { HiddenField hfStudentID = lvi.FindControl("hfID") as HiddenField; CheckBox cbPresent = lvi.FindControl("mycb") as CheckBox; int sInt = Int32.Parse(hfStudentID.Value); dc = new DataClassesSODataContext();//I renewed the dc to make sure that wasn't the problem? var currStudent = dc.students.Single(x => x.studentID == sInt); grade g = dc.grades.Single(x => x.subjectID == subjID || x.studentID == sInt); if (g == null) { g = new grade(); g.subject = dc.subjects.Single(x => x.subjectID == subjID); g.student = currStudent; g.present = cbPresent.Checked; dc.grades.InsertOnSubmit(g); } else { g.present = cbPresent.Checked; dc.grades.Attach(g, true);//I tried both attaching and inserting } } dc.SubmitChanges();
