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!
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Jan 18, 2010
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?
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Oct 30, 2010
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[Transactional(TransactionalTypes.TransactionScope)]
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Feb 24, 2010
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Mar 26, 2010
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();
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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);
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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();
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Nov 23, 2010
I have to update teh database table using Linq.
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Dec 17, 2010
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.
[Code]....
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May 2, 2010
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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)
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at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)
Exception rethrown at [0]:
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at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
at IService1.GetPollById(Int32 pollId)
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Apr 23, 2010
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Nov 30, 2010
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try
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OdbcConnection MyConnection = new OdbcConnection(ConfigurationManager.ConnectionStrings["myconn"].ConnectionString);
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}
catch(Exception epp)
{
Response.Write(epp);
}
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Oct 22, 2010
For right now, the View Account for an individual user has the following setup on the aspx page.
[Code]....
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[Code]....
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[Code]....
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Nov 16, 2010
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Sep 27, 2010
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.
Here's my stored procedure...
[Code]....
[Code]....
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What's wrong with the following code?
[Code]....
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Aug 10, 2010
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"
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}
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Apr 12, 2010
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.
[Code]....
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Mar 13, 2011
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.
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Mar 29, 2010
I have something like the following in pages in two different projects, which saves to a DB with a LINQ to SQL operation:
[Code]....
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Feb 23, 2010
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.
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Feb 1, 2010
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
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Is that possible?
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Feb 11, 2011
I have Linq-to-SQL DataContext and I run:
datacontext.CreateDatabase()
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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.
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Jul 7, 2010
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.
[Code]....
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Apr 4, 2011
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 = ""
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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
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dbDelete.SaveChanges()
End Sub
The specific line erroring out is: remove_bed.First.occupant = ""
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