can somebody help me with sql data reader

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I need help with reading data from my database. I have tried this piece of code but it doesnt seem to display the results in the text box i want. The 'filename' in the where clause is already defined. its just not incluced here

<pre>

String connection, sql;

connection = Properties.Settings.Default.cvmanagerConnectionString;
sql = "select FileLoc, Fname, Lname from apps where FileLoc = '" + filename + "'";

try
{
SqlDataReader reader = null;
SqlConnection conn = new SqlConnection(connection);
SqlCommand cmd = new SqlCommand(sql, conn);

conn.Open();
reader = cmd.ExecuteReader();

if (reader.HasRows)
{
while (reader.Read())
{
tbappname.Text = reader["Fname"].ToString();
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}

Posted 28-Oct-10 0:59am

Member 7250221

Updated 28-Oct-10 1:03am

v3

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Comments

Mohd Wasif 28-Oct-10 7:05am

what is + filename +
Please clarify

OriginalGriff 28-Oct-10 7:09am

What is it doing that it shouldn't or not doing that it should?

[no name] 28-Oct-10 7:13am

filename is the location of the file on my computer. i am using openfiledialog to get the filename once a file is selected. it is this filename that i append to the where clause. this same filename is stored in the database with an earlier command.

[no name] 28-Oct-10 7:14am

originalgriff.....it is suppose to display the a name in the textbox. this name is in my database in the same row as the filename. the filename acts as an id.

OriginalGriff 28-Oct-10 7:39am

Ok. Is it replacing the tbappname.Text with anything? Or with blank? Or does it not change it at all?
Put a breakpoint on the "reader = cmd.ExecuteReader();" line, and run your program to there. Then single step though to see what it happening.

[no name] 28-Oct-10 7:51am

its working now. i had to clear the textbox first before appending anything to it...like this :tbappname.clear(); thanks alot though

OriginalGriff 28-Oct-10 8:00am

I suspect that wasn't your problem: "tbappname.Text = anyStringYouLike;" is the equivalent to clearing it and assigning a new value. Did you change anything else?

4 solutions

Solution 1

SqlCommand cmd = new SqlCommand("select FileLoc, Fname, Lname from apps where FileLoc = '" + TextBox1.Text + "'", conn);
conn.open();
SqlDataReader reader=cmd.ExecuteReader();
if(reader.Read())
{

tbappname.Text = reader["Fname"].ToString();
reader.Close();
conn.Close();
}
else
{
string message="no record found";
reader.Close();
conn.Close();
}

Posted 28-Oct-10 1:09am

Mohd Wasif

Comments

[no name] 28-Oct-10 7:16am

if you look at line 3, i have initialised the sql variable. it is this variable together with conn that i have parsed to the sqlcommand method. isnt this the same as at what you are suggesting?

Solution 3

check do you have data in db for that particular file name...

please run the below code for testing weather the obeject returning data or not and let me know .

String connection, sql;

connection = Properties.Settings.Default.cvmanagerConnectionString;
sql = "select Fname from apps where FileLoc = '" + filename + "'";

try
{
SqlDataReader reader = null;
SqlConnection conn = new SqlConnection(connection);
SqlCommand cmd = new SqlCommand(sql, conn);

conn.Open();
//reader = cmd.ExecuteReader();

object Fname = cmd.ExecuteScalar();

if(Fname!=null)
{
Response.Write("alert('"+ Fname.ToString() +"');");
tbappname.Text = Fname.ToString();
}
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
finally
{
conn.Close()
}

Posted 28-Oct-10 1:58am

RECSEN

Comments

[no name] 28-Oct-10 8:08am

i solved the problem. i had to make sure the filename was pointing to the file folder and not the actual file so i reconfigured the database to that effect. thanks a lot though

Solution 4

use ExecuteScalar() instead of ExecuteReader()

string name=cmd.ExecuteScalar().ToString();

Posted 28-Oct-10 6:44am

alrosan

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RECSEN · Accepted Answer · 2010-10-28T01:10:00

If your planning to bind text in Textbox control please use the below code .. what your wrote the above code is to get all record from db and it will bind record one by one to TextBox control so the previous value will clear and new value will come to the pic.
Use the below code

String connection, sql;

connection = Properties.Settings.Default.cvmanagerConnectionString;
sql = "select FileLoc, Fname, Lname from apps where FileLoc = '" + filename + "'";

try
{
SqlDataReader reader = null;
SqlConnection conn = new SqlConnection(connection);
SqlCommand cmd = new SqlCommand(sql, conn);

conn.Open();
//reader = cmd.ExecuteReader();

object Fname = cmd.ExecuteScalar();

if(Fname!=null)
{
tbappname.Text = Fname.ToString();
}
//if (reader.HasRows)
//{
//while (reader.Read())
// {
// tbappname.Text = reader["Fname"].ToString();
// }
//}
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
finally
{
conn.Close()
}

can somebody help me with sql data reader

4 solutions

Solution 1

Solution 2

Solution 3

Solution 4

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