how can i read the single column value from database

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i m trying to read as....

string a;
cmd = new SqlCommand("select role from temp where (emp_id='" + txtUserId.Text + "' and paswrd='" + txtPwd.Text + "')",cn);
                    a = cmd.ExecuteReader().Read().ToString();
                    Console.Write(a);

.... it is not giving any error ... but no value is coming in "a"....
pls help

Posted 16-Feb-12 20:41pm

shweta9999

Updated 16-Feb-12 20:47pm

Varun Sareen

v2

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OriginalGriff · Answer 1 · 2012-02-16T20:46:00

Try:

C#

cmd = new SqlCommand("select role from temp where (emp_id='" + txtUserId.Text + "' and paswrd='" + txtPwd.Text + "')",cn);
SqlDataReader reader = cmd.ExecuteReader().Read().ToString();
if (reader.Read())
   {
   Console.Write((string) reader["role"]);
   }

Or, better, use parametrised queries and stop people destroying your database with SQL Injection:

C#

cmd = new SqlCommand("select role from temp where (emp_id=@ID and paswrd=@PW)",cn);
cmd.Parameteres.AddWithValue("@ID", txtUserId.Text);
cmd.Parameteres.AddWithValue("@PW", txtPwd.Text);
SqlDataReader reader = cmd.ExecuteReader().Read().ToString();
if (reader.Read())
   {
   Console.Write((string) reader["role"]);
   }

Even better, don't ever store passwords in straight text! There is a Tip here that explains that: Password Storage: How to do it.[^]

"can u provaide the solution through SqlDataAdaptor..

thanks"

What did your last slave die of?

C#

using (SqlConnection connection = new SqlConnection(strConnect))
    {
    SqlDataAdapter da = new SqlDataAdapter();
    da.SelectCommand = new SqlCommand("SELECT role FROM temp WHERE emp_id=@ID AND paswrd=@PW", connection);
    da.SelectCommand.Parameters.AddWithValue("@ID", txtUserId.Text);
    da.SelectCommand.Parameters.AddWithValue("@PW", txtPwd.Text);
    DataTable dt = new DataTable();
    da.Fill(dt);
    }

Varun Sareen · Answer 2 · 2012-02-16T20:48:00

Solution 2

Please try this:-

string a;
cmd = new SqlCommand("select role from temp where (emp_id='" + txtUserId.Text + "' and paswrd='" + txtPwd.Text + "')",cn);
a = cmd.ExecuteScalar().ToString();
Console.Write(a);

Posted 16-Feb-12 20:48pm

Varun Sareen

Comments

shweta9999 17-Feb-12 5:02am

hi varun can u please provide solution using ..."sqlDataAdaptor"

thanks

Varun Sareen 17-Feb-12 11:21am

Dear Shweta, OriginalGriff has updated his answer. Please see

shweta9999 19-Feb-12 22:24pm

it is not working...
it says...

Object reference not set to an instance of an object.

:-(

Varun Sareen 20-Feb-12 11:30am

ohh!!! will provide you solution soon

Aniket Yadav · Answer 3 · 2012-02-17T00:43:00

Solution 3

Hope This Will Help You

http://www.diranieh.com/Netado/DataAdapters.htm[^]

Posted 17-Feb-12 0:43am

Aniket Yadav