LINQ To SQL SubmitChanges() Doesn't Update The Database
Mar 17, 2010
In my 2nd ASP.NET MVC project I'm facing a very weird problem: when I call the SubmitChanges method of the DataContext class, nothing updates in the database. It's weird because everything works fine with my first project. I'm using a remote database created in Sql Server Management Studio, I tried doing some queries there and in Visual Studio 2010 (where I have the connection to the database), they all work. Where might the problem be hidden?
DBDataContext DB = new DBDataContext();
var myuser = DB.Users.Single(u => u.ID == id);
myuser.Age = 45;
DB.SubmitChanges();
This is embarrassing :D Indeed I didn't have a primary key. Now it works!
want to know if linq to sql auto updated the id column of a class (table row object) after SubmitChanges is called inserting a new row to that table, that would be fantastic, would anyone be able to confirm this?
I was trying to delete records from database and sometimes on production, the SubmitChanges() goes through and updates the associated entities yet the data does not gets deleted in the database.This is happening only in production and I could not replicate the same on stage or on my local machine. Now the table in which I am performing the delete transaction does have primary keys.
I am working on a content management system which is being sort of retrofitted onto an existing database, and the database has many many tables. There will be a staging database, where we will make changes and allow users to 'preview in place'. Then any changes have to be approved, and to publish them we will connect to a live version of the same database (same schema) and play-forward the captured changes.I have found some code (called Doddle Audit) which, with some customization, is giving me great information about what is changing. I am able to get a list of all columns, before and after, for updates, inserts, and deletes. But what I would really like to have is the underlying SQL being run by SubmitChanges(). LinqToSql has to generate this, so why can't I have it? I have googled around and looked at code involving SubmitChanges, mousing over stuff, and I can't seem to find it. Does anyone know of a way to obtain this?
protected void Button3_Click(object sender, EventArgs e) { //Create a connection to the database MySqlConnection conn = new MySqlConnection("Database=kid07025;Data Source=195.178.228.254;User Id=kid07025;Password=********"); //open the connection conn.Open(); //MySQL Query which updates the row where Anvandarnamn = Anvandarnamn (recieved from a cookie) MySqlCommand cmd = new MySqlCommand("UPDATE personer SET Information=?Information,Fnamn=?Fnamn,Enamn=?Enamn,Personnr=?Personnr,Adress=?Adress,Postnr=?Postnr,Ort=?Ort WHERE Anvandarnamn=?Anvandarnamn", conn); // Update with new text cmd.Parameters.AddWithValue("?Anvandarnamn", Request.Cookies["Anvandarnamn"].Value); cmd.Parameters.AddWithValue("?Information", TextBox1.Text); cmd.Parameters.AddWithValue("?Fnamn", TextBox2.Text); cmd.Parameters.AddWithValue("?Enamn", TextBox3.Text); cmd.Parameters.AddWithValue("?Personnr",TextBox4.Text); cmd.Parameters.AddWithValue("?Adress", TextBox5.Text); cmd.Parameters.AddWithValue("?Postnr", TextBox6.Text); cmd.Parameters.AddWithValue("?Ort", TextBox7.Text); cmd.ExecuteReader(); conn.Close(); RefreshProfile(); }
I don't know what I am doing wrong here, but the database doesn't get updated when I press the button.
[HttpPost] public ActionResult Deposit(DepositTicket dt)[code]....
Where the comment "Update Query" is, is where I want to add an update query to updated the Account table with an Account object. I want to update the exisiting record, can this be done using the predefined functions for db.Accounts or would I have to write a linq query?
I'm using linq to sql to on a recent project. So was wondering if anyone could provide any advice as to why this code doesn't update the database? The problem seems to be that the value from the textbox isn't persisted when I click the submit button in the gridview.
I keep running into a problem when trying to connect to my web service. THe problem only occurs when I try to update the database linq to sql file. When I do this and then upload the wcf services and attempt to connect I get this error: Quote: The server did not provide a meaningful reply; this might be caused by a contract mismatch, a premature session shutdown or an internal server error.
Server stack trace: at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout) at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs) at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMess age methodCall, ProxyOperationRuntime operation) at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message) Exception rethrown at [0]: at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) at IService1.GetPollById(Int32 pollId) at Service1Client.GetPollById(Int32 pollId)
If I then revert back to the old linq to sql file it works fine.
I have a table with Id, Name,...IsActive, etc. If user wants to delete a record from the user, he/she should update the field IsActive to false. I am able to acheive this functionality using the below steps,
1. Query the database for the row which is to be updated.
2. Update the property IsActive to false.
3. Submit the changes to the database.
This way i am successful. But i have a query here is that, when we execute steps 1 and 3, there will be two trips to the database for getting the required object and again updating the same object to the database.
Is this not a performance hit having multiple calls to DB for a simple operation.?
Do we have any other go, where in within a single call to database, can i update a field of row?
when i specify values in my update query the query works fine and the database gets updated, but when i use parameters in my query the database does not update here is the code i have written
I have a page that binds data from DB to a DetailsView.I want to use the auto-generated Update command.
Everything went OK, and also updating was successful, but if I remove any field that I don't want to have chance to update, then the Update command doesn't update! the old values retain!
I mean: if all of the fields are present in the detailsView, the update will be OK, otherwise, the update will NOT update any thing.I've tried to mark the fields that I don't want to view as "Visible = 'false'" but with no good results!
I have a vb.net page that has an optional parameter. If a user enters data for that field, and clicks save, it saves fine via the stored procedure. HOWEVER, if the user changes their mind, and wants to erase the data they entered, they go to the text field, and delete the characters, and click save, but no matter what, the stored procedure will not save the fact that they erased the data (it won't set it back to NULL). If the user enters a space, the stored procedure will save the space, and if they enter different data, it will save the other data. I can't figure out how to get it back to letting them set it to Null? I think this is because it's an optional parameter, and the stored proc is used by several forms (Some of those forms do not include this parameter), but this form utilizes that optional paramater.
After the SubmitChanges call, the Text field in data2 wasn't changed. According to the NerdDinner sample, I supposedly can just write to my data object and then call SubmitChanges.
I am working on a page which display a gridview of members in a household. There are also other inputs for the entire household and one button at the bottom of the page that is intended to save the changes, or insert a new household depending on the situation. The number of rows is dynamic and the user can add and remove displayed rows. This is fine for a new household, but on an existing one I need it to delete the member from the household. I can do this easily right away, but I'm wondering if there is a way I can save or store the pending changes, basically the deleteonsubmit, insertonsubmit, and updates, till I call the submitchanges method when the user clicks save. That way if they change their mind about the changes, say the delete a member or an income they
When i type and run the following query in ASP.net, then get a error ("Comparison of the data types ntext, text, XML and image data types can not be processed by SQL Server.") (translated from Dutch...)
var gebruikerrow = from u in db.Users where u.login=="dsf" select u.login; foreach (var Result in gebruikerrow) { Label50.Text += Result.ToString() + " "; }
What am i doing wrong?
the Datatype for login (in the table Users) is Text.
I have a typical gridview/formview master control setup. When I try to update or insert I don't get any errors but it also doesn't work. When I try to insert data all I get are null values and when I update, none of the values are updated. The formview looks like its working, but just doesn't. The primary key is an identity and it auto-increments by one.
I have a couple of tables I ported over to a new database. Everything is exactly the same from the legacy one to the new one. The back-end code that submits the user generated data to the database is also the same. When I submit changes to the database, all of the submitted information populates the correct columns but the column that stores the GUID populates with all 0's. When I enter in the columns manually using SQL Server Management Studio, the GUID gets populated as it does in the legacy version.
I have something like the following in pages in two different projects, which saves to a DB with a LINQ to SQL operation:
[Code]....
One of the pages works with this code and the other doesn't. The only difference is that the project in which it does work employs a data control tool (ListView) and a custom profile provider.
I am running through this tutorial on ASP.NET MVC: [URL] Everything seemed to be going fine. I created my DB, created my Model classes, created a controller class and then started creating some Action handlers. When I finally created the page that submits updates to the DB, I got the following error:
System.NotImplementedException: The method or operation is not implemented.
Line 49: public void Save()Line 50: {Line 51: db.SubmitChanges();Line 52: }
when I call the "SubmitChanges()" method of the DataContext class. I tried recreating my DBML file from my tables, but I still get the same error.
The ASP.NET linq SubmitChanges method commits changes for all previous database modifications since the last time it was called.
I have a case where I do something like the following:
ClassX x = new Abc.Linq.ClassX(); DataContext.InsertOnSubmit(x); ClassY y = new Abc.Linq.ClassXY(); DataContext.InsertOnSubmit(y);
DataContext.SubmitChanges();//x and y are committed to the database
I would like to insert y but not X in the line above. Then I would like to insert X with another call to SubmitChanges() sometime later. I have to execute the code in the order shown.
Recently I dragged a stored procedure onto the methods pane. I was thinking this stored procedure was now part of the datacontext and would get regenerated when creating the database.
I'm got 2 model objects. Category and CategoryItem. I try to add a CategoryItem to Category in my Controller but It wont save to database, and I know why because I don't know how to call the submitChanges on the add while using repository, I dont got the DBContext right there is you know what I mean?.. here I will show you with code.
I have a GridView and on a row being deleted I trigger the GridView1_RowDeleting sub, but I receive an error "LINQ to Entities does not recognize the method 'System.Web.UI.WebControls.TableCell get_Item(Int32)' method, and this method cannot be translated into a store expression." Code is:
Private Sub GridView1_RowDeleting(sender As Object, e As System.Web.UI.WebControls.GridViewDeleteEventArgs) Handles GridView1.RowDeleting ' The deletion of the individual row is automatically handled by the GridView. Dim dbDelete As New pbu_housingEntities ' Remove individual from the bed. Dim remove_bed = From p In dbDelete.Beds _ Where p.occupant = GridView1.Rows(e.RowIndex).Cells(3).Text _ Where p.room = GridView1.Rows(e.RowIndex).Cells(6).Text _ Where p.building = GridView1.Rows(e.RowIndex).Cells(5).Text _ Order By p.id Descending _ Select p remove_bed.First.occupant = "" dbDelete.SaveChanges() ' Increase number of open spaces in room. Dim update_occupancy = From p In dbDelete.Rooms _ Where p.room1 = GridView1.Rows(e.RowIndex).Cells(6).Text Where p.building = GridView1.Rows(e.RowIndex).Cells(5).Text _ Select p update_occupancy.First.current_occupancy = update_occupancy.First.current_occupancy - 1 dbDelete.SaveChanges() End Sub
The specific line erroring out is: remove_bed.First.occupant = ""
