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

Posted on 2007-11-21
9
3,502 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
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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.

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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
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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
    	{
    	}

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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

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