From the database I am trying to display a single common name using label please guide me I am a beginner in C#

Question

0.00/5 (No votes)

See more:

I am trying to make a feedback form where I want to show name which is inserted for n number of times.

My DataBase Have for example 9 time same names as feedback was inputted for that same person 9 times and I want to display it on result that common name

Please help me out to complete the code/solution and get the result.

SQL QUERY IS RUNNING PROPERLY IT IS SELECTING THE SINGLE DATA FROM DATABASE BUT HOW TO SHOW THIS ON WEBPAGE

public void cal_F2name()
{
       string oracledb = "Data Source=(DESCRIPTION =(ADDRESS = (PROTOCOL = TCP****))(****))(CONNECT_DATA =(SERVER = DEDICATED)(SID = ORCL));";
       OracleConnection conn = new OracleConnection(oracledb);
       conn.Open();

       OracleCommand cmd = new OracleCommand();
       cmd.Connection = conn;
       OracleDataAdapter da1 = new OracleDataAdapter();
       DataTable dt1 = new DataTable();
       DataSet ds1 = new DataSet();

       cmd.CommandText = "SELECT DISTINCT (F2NAME) FROM CMDC_FEEDBACK WHERE PRG_NAME ='" + cb_prg_name.SelectedValue + "'";

             da1.SelectCommand = cmd;
            da1.Fill(ds1);
            name = Convert.ToString(ds1.Tables[0].Rows[0][0].ToString());

             Label58.Text = String.Format("{0:0.00}",name);


       conn.Close();
}

What I have tried:

Please note in comments i have tried various method , I am just beginner

public void cal_F2name()
      {
          string oracledb = "Data Source=(DESCRIPTION =(ADDRESS = (PROTOCOL = TCP)(HOST = *******)(PORT = ****))(CONNECT_DATA =(SERVER = DEDICATED)(SID = ORCL))); User Id=****;Password=*****;";

          OracleConnection conn = new OracleConnection(oracledb);
          conn.Open();

          OracleCommand cmd = new OracleCommand();
          cmd.Connection = conn;
          OracleDataAdapter da1 = new OracleDataAdapter();
          DataTable dt1 = new DataTable();
          DataSet ds1 = new DataSet();

          cmd.CommandText = "SELECT DISTINCT (F2NAME) FROM CMDC_FEEDBACK WHERE PRG_NAME ='" + cb_prg_name.SelectedValue + "'";
          /*    cmd.ExecuteNonQuery();
             da1.Fill(dt1);
             d1.Datasource = dt1;
                da1.SelectCommand = cmd;
               da1.Fill(ds1);
               name = Convert.ToString(ds1.Tables[0].Rows[0][0].ToString());

               name=Convert.ToString(dr.Read());

               name = Convert.ToString(dt1.Rows[0][0]);

               name = Convert.ToString(cmd.ExecuteReader());

                Label58.Text = String.Format("{0:0.00}",name);

             OracleDataReader reader = cmd.ExecuteReader();

             reader.Read();

             Label58.Text = reader.ToString();

               OracleDataReader reader = cmd.ExecuteReader();
               reader.Read();
               if (reader.HasRows)
               {
                   Label58.Text = reader["F2NAME"].ToString();
               }
           *
           *  */


          conn.Close();

      }

Posted 8-Jun-22 19:18pm

Member 15667119

Updated 8-Jun-22 22:50pm

v3

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Answer 1 · 2022-06-08T19:23:00

You haven't told us what the problem you are meeting is, but ... don't do it like that! Never concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Always use Parameterized queries instead.

When you concatenate strings, you cause problems because SQL receives commands like:

SQL

SELECT * FROM MyTable WHERE StreetAddress = 'Baker's Wood'

The quote the user added terminates the string as far as SQL is concerned and you get problems. But it could be worse. If I come along and type this instead: "x';DROP TABLE MyTable;--" Then SQL receives a very different command:

SQL

SELECT * FROM MyTable WHERE StreetAddress = 'x';DROP TABLE MyTable;--'

Which SQL sees as three separate commands:

SQL

SELECT * FROM MyTable WHERE StreetAddress = 'x';

A perfectly valid SELECT

SQL

DROP TABLE MyTable;

A perfectly valid "delete the table" command

SQL

--'

And everything else is a comment.
So it does: selects any matching rows, deletes the table from the DB, and ignores anything else.

So ALWAYS use parameterized queries! Or be prepared to restore your DB from backup frequently. You do take backups regularly, don't you?