Question

my c# sql updates and inserts are slow, can cause alert errors

Asked by: ronin83

in the code section below i've pasted the way i do all of my SQL insert's updates and deletes. i'm entirely self taught and just sort of pick up habits where i find them, so please excuse my ignorance if this is a silly question that you feel all should know.

basically, i have a really large site and this is the code i put behind buttons to do things with the database when user's click. my issue is that i run into plenty of instances where a button click will take a really long time to compelte, even though i'm watching my server's task manager and resources and they're all very low usage and wouldn't explain the delays. it's very random, sometimes buttons run fast, sometimes they don't.

another problem is that if i have a page that may have many user clicks on the same page (like a inbox, where users are deleting messages) it seems to get clogged after a few button clicks, not succesfully performing the SQL commands for all button clicks after the second or third.

i'll also fairly routinely get javascript alert box errors in my browser if i try to navigate away from the page i've just button clicked, if the SQL behind it hasn't completed. this is all very ugly obviously.

it's recently occurred to me that maybe there's just a better way of performing SQL commands so i thought i'd ask you guys. please keep your answers dumbed down, i'm very novice and just learning as i go.

any ideas? thanks in advance for any help. i work in asp.net c# mssql2005 windows server 2003

protected void UpdateButton_Click4(object sender, EventArgs e)
    {
        Button wh = sender as Button;
        string fid = wh.CommandArgument.ToString();
        int index = Int32.Parse(wh.CommandName);
 
        // save changes to file
        SqlDataSource favsupdate = new SqlDataSource();
        favsupdate.ConnectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ToString();
        favsupdate.UpdateCommandType = SqlDataSourceCommandType.Text;
        favsupdate.UpdateCommand = "UPDATE files SET title = @title, keywords = @keywords, description = @description, "
        + "password = @password, private = @private, showownership = @showownership, allowcomments = @allowcomments, "
        + "allowratings = @allowratings, allowtagging = @allowtagging, showchat = @showchat WHERE FID = @FID";
        favsupdate.UpdateParameters.Add("FID", fid);
        favsupdate.UpdateParameters.Add("title", ((TextBox)DataList3f.Controls[index].FindControl("titleTextBox")).Text);
        favsupdate.UpdateParameters.Add("keywords", ((TextBox)DataList3f.Controls[index].FindControl("keywordsTextBox")).Text);
        favsupdate.UpdateParameters.Add("description", ((TextBox)DataList3f.Controls[index].FindControl("descriptionTextBox")).Text);
        favsupdate.UpdateParameters.Add("password", ((TextBox)DataList3f.Controls[index].FindControl("TextBox1")).Text);
        favsupdate.UpdateParameters.Add("private", ((CheckBox)DataList3f.Controls[index].FindControl("CheckBox1")).Checked.ToString());
        favsupdate.UpdateParameters.Add("showownership", ((CheckBox)DataList3f.Controls[index].FindControl("CheckBox2")).Checked.ToString());
        favsupdate.UpdateParameters.Add("allowcomments", ((CheckBox)DataList3f.Controls[index].FindControl("CheckBox3")).Checked.ToString());
        favsupdate.UpdateParameters.Add("allowratings", ((CheckBox)DataList3f.Controls[index].FindControl("CheckBox4")).Checked.ToString());
        favsupdate.UpdateParameters.Add("allowtagging", ((CheckBox)DataList3f.Controls[index].FindControl("CheckBox5")).Checked.ToString());
        favsupdate.UpdateParameters.Add("showchat", ((CheckBox)DataList3f.Controls[index].FindControl("CheckBox6")).Checked.ToString());
        favsupdate.Update();
    }

                                  
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Asked On
2009-08-03 at 12:46:51ID24622625
Tags

sql c# asp.net visual studio

Topics

Programming for ASP.NET

,

C# Programming Language

,

Visual Studio

Participating Experts
2
Points
500
Comments
8

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Answers

 

by: carlnorrbomPosted on 2009-08-03 at 13:16:09ID: 25008250

Hi,

In Your case I would suggest abstracting the data access methods into it's own class and spawn it into a separate thread for instance if the updates are taking a long time to complete, freing up the UI and making the user experience better. I would suggest looking into "Asynchronous Pages" for instance:

http://msdn.microsoft.com/en-us/magazine/cc163725.aspx

/Carl.

 

by: prairiedogPosted on 2009-08-03 at 14:05:53ID: 25008630

Try using SqlCommand to do the work, instead of SqlDataSource.

 

by: ronin83Posted on 2009-08-03 at 14:09:36ID: 25008662

calrnoorbom, thanks for the link i'll try to read it. seems complicated though, hope i can cut it.

prairiedog, any chance you could provide a short code snippet example of what i'd run to update a single column in a single db with sqlcommand? i wouldn't know where to start.

 

by: prairiedogPosted on 2009-08-03 at 14:23:48ID: 25008772

I modified your code snippet to use SqlCommand:

protected void UpdateButton_Click4(object sender, EventArgs e)
{
	Button wh = sender as Button;
	string fid = wh.CommandArgument.ToString();
	int index = Int32.Parse(wh.CommandName);
 
	// save changes to file
	string strConn = ConfigurationManager.ConnectionStrings["ConnectionString"].ToString();
	SqlConnection conn = new SqlConnection(strConn);
	SqlCommand cmd = new SqlCommand(conn);
	cmd.CommandType = CommandType.Text;
	cmd.CommandText = "UPDATE files SET title = @title, keywords = @keywords, description = @description, "
	+ "password = @password, private = @private, showownership = @showownership, allowcomments = @allowcomments, "
	+ "allowratings = @allowratings, allowtagging = @allowtagging, showchat = @showchat WHERE FID = @FID";
	try
	{
		conn.Open();
		cmd.Parameters.AddWithValue("@FID", fid);	
		cmd.Parameters.AddWithValue("@title", ((TextBox)DataList3f.Controls[index].FindControl("titleTextBox")).Text);
		cmd.Parameters.AddWithValue("@keywords", ((TextBox)DataList3f.Controls[index].FindControl("keywordsTextBox")).Text);
		cmd.Parameters.AddWithValue("@description", ((TextBox)DataList3f.Controls[index].FindControl("descriptionTextBox")).Text);
		cmd.Parameters.AddWithValue("@password", ((TextBox)DataList3f.Controls[index].FindControl("TextBox1")).Text);
		cmd.Parameters.AddWithValue("@private", ((CheckBox)DataList3f.Controls[index].FindControl("CheckBox1")).Checked.ToString());
		cmd.Parameters.AddWithValue("@showownership", ((CheckBox)DataList3f.Controls[index].FindControl("CheckBox2")).Checked.ToString());
		cmd.Parameters.AddWithValue("@allowcomments", ((CheckBox)DataList3f.Controls[index].FindControl("CheckBox3")).Checked.ToString());
		cmd.Parameters.AddWithValue("@allowratings", ((CheckBox)DataList3f.Controls[index].FindControl("CheckBox4")).Checked.ToString());
		cmd.Parameters.AddWithValue("@allowtagging", ((CheckBox)DataList3f.Controls[index].FindControl("CheckBox5")).Checked.ToString());
		cmd.Parameters.AddWithValue("@showchat", ((CheckBox)DataList3f.Controls[index].FindControl("CheckBox6")).Checked.ToString());
		cmd.ExecuteNonQuery();
	}
	catch (Exception e)
	{
		throw (e);
	}
	finally
	{
		conn.Close();
	}
}

                                              
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by: ronin83Posted on 2009-08-04 at 12:13:51ID: 25017140

got this error trying your code

 Compilation Error
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS1502: The best overloaded method match for 'System.Data.SqlClient.SqlCommand.SqlCommand(string)' has some invalid arguments

Source Error:

Line 216:        string strConn = ConfigurationManager.ConnectionStrings["ConnectionString"].ToString();
Line 217:        SqlConnection conn = new SqlConnection(strConn);
Line 218:        SqlCommand cmd = new SqlCommand(conn);

 

by: ronin83Posted on 2009-08-04 at 12:15:08ID: 25017152

could you explain what this does? appreciated

catch (Exception e)
        {
            throw (e);
        }

 

by: prairiedogPosted on 2009-08-04 at 12:27:03ID: 25017261

Change
SqlCommand cmd = new SqlCommand(conn);
To:
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;

catch (Exception e)
{
 throw (e);
}
basically catch the exception then re-throw this exception in case you have a centralized place to handle all exception errors. You can change it to something like this:
catch (Exception e)
{
  //handle the exception locally.
}

20120131-EE-VQP-002

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