Solved

How to export the contents of a datareader to a CSV file - asp.net c# and sql server

Posted on 2007-11-21
9
3,440 Views
Last Modified: 2013-11-26
I have a routine that does a dynamic search that returns a datareader.  How can I amend the following routine so that it exports the datareader fields to a csv file............
Here is the code

 IDataReader thisReader = null;
        try
        {
            try
            {

                if (isAllUserSearch == true)
                {
                    thisReader = doAllUserSearch();
                }
                else
                {
                    thisReader = doSearch();
                }

                int count = 0;
                while (thisReader.Read())
                {
                    //THIS IS WHERE I WANT TO ADD THE SQL DATAREADER FIELDS INTO A CSV FILE
                    For example, I want to have the following fields on different lines
                        (string)thisReader["Address1"];
                        (string)thisReader["Address2"];                                    
                }
                Emailer.ActiveStepIndex = 6;            }
            catch (Exception Ex)
            {
                lblMessagesProcessed.Text = "There appears to be an error whilst sending emails";
                throw;
            }
        }
0
Comment
Question by:mugsey
  • 5
  • 4
9 Comments
 
LVL 23

Expert Comment

by:Ashish Patel
ID: 20328106
Try this and note the last line comment to proceed further.
IDataReader thisReader = null;
string add1 = "";
string add2 = "";
        try
        {
            try
            {
 
                if (isAllUserSearch == true)
                {
                    thisReader = doAllUserSearch();
                }
                else 
                {
                    thisReader = doSearch();
                }
 
                int count = 0;
                while (thisReader.Read())
                {
                    //THIS IS WHERE I WANT TO ADD THE SQL DATAREADER FIELDS INTO A CSV FILE
                    For example, I want to have the following fields on different lines
                        add1 += (string)thisReader["Address1"] + ", ";
                        add2 += (string)thisReader["Address2"] + ", ";
                }
 
		if(add1.length > 2)
			add1 = add1.substring(0,add1.length-2);
		if(add2.length > 2)
			add2 = add2.substring(0,add2.length-2);
 
                Emailer.ActiveStepIndex = 6;            }
            catch (Exception Ex)
            {
                lblMessagesProcessed.Text = "There appears to be an error whilst sending emails";
                throw;
            }
        }
 
	//NOW here you have add1 and add2 string as CSV, so you can now write this to the file.

Open in new window

0
 

Author Comment

by:mugsey
ID: 20328244
Thanks for your reply, so say I wanted the csv file export to look like the following

Salutation,
FirstName,
LastName,
Address1,
Address2,
PostalCode,

How would I write the last bit of code to save the CSV to file?
0
 

Author Comment

by:mugsey
ID: 20328269
In fact the CSV file could just be
firstname, lastname, address1, address2, postcode
0
Master Your Team's Linux and Cloud Stack

Come see why top tech companies like Mailchimp and Media Temple use Linux Academy to build their employee training programs.

 
LVL 23

Expert Comment

by:Ashish Patel
ID: 20328293
What should you CSV file look like when you have more than 1 records. Can you please show me.
0
 

Author Comment

by:mugsey
ID: 20328375
Well it does not matter really, so long as the user can search through the CSV

I think they want to have CSV but the ability to export to Excel also.  So it could be in either format

say

Salutation, FirstName, LastName, Address1, Address2, PostalCode

OR

Salutation,
FirstName,
LastName,
Address1,
Address2,
PostalCode,


0
 
LVL 23

Accepted Solution

by:
Ashish Patel earned 500 total points
ID: 20328644
Below is complete one for this way of csv.
Salutation, FirstName, LastName, Address1, Address2, PostalCode

last try catch has file wrtting stuff.

	IDataReader thisReader = null;
	string strvalues = "";
 
        try
        {
            try
            {
 
                if (isAllUserSearch == true)
                {
                    thisReader = doAllUserSearch();
                }
                else 
                {
                    thisReader = doSearch();
                }
 
                int count = 0;
                while (thisReader.Read())
                {
 
                        strvalues += (string)thisReader["Salutation"] + ", " + (string)thisReader["FirstName"] + ", " + (string)thisReader["LastName"] + ", ";
                        strvalues += (string)thisReader["Address1"] + ", " + (string)thisReader["Address2"] + ", " + (string)thisReader["PostalCode"] + ", ";
 
 
			if(strvalues.length > 2)
				strvalues = strvalues.substring(0, strvalues.length-2) + "\n";
 
                }
 
 
                Emailer.ActiveStepIndex = 6;            }
            catch (Exception Ex)
            {
                lblMessagesProcessed.Text = "There appears to be an error whilst sending emails";
                throw;
            }
        }
 
	try    
	{
        	FileStream fsOutput = new FileStream ("C:\\Temp\\schema.csv", FileMode.Create, FileAccess.Write);
 
		StreamWriter srOutput = new StreamWriter (fsOutput);
		srOutput.WriteLine(strvalues.ToString());
        	srOutput.Close ();
        	fsOutput.Close ();                    
    	}
    	catch (Exception ex)
    	{
        	lblMessagesProcessed.Text = "Writting file error.";
                throw;
    	}
    	finally
    	{
    	}

Open in new window

0
 

Author Comment

by:mugsey
ID: 20328678
Thanks a lot

So could I have a browse dialog box so the user can save the csv file on their desktop?
0
 
LVL 23

Expert Comment

by:Ashish Patel
ID: 20328773
Sorry mugsey, i dont know about that, but you can search it from google somewhere writting open save dialog C#. Time to go for me now. Have a nice day
0
 

Author Comment

by:mugsey
ID: 20329055
OK Thanks - I will award points as I will use it as a basis
0

Featured Post

Master Your Team's Linux and Cloud Stack!

The average business loses $13.5M per year to ineffective training (per 1,000 employees). Keep ahead of the competition and combine in-person quality with online cost and flexibility by training with Linux Academy.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

A long time ago (May 2011), I have written an article showing you how to create a DLL using Visual Studio 2005 to be hosted in SQL Server 2005. That was valid at that time and it is still valid if you are still using these versions. You can still re…
Exception Handling is in the core of any application that is able to dignify its name. In this article, I'll guide you through the process of writing a DRY (Don't Repeat Yourself) Exception Handling mechanism, using Aspect Oriented Programming.
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …
A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA). For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651 If you want to manage em…

837 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question