Simple SQL question....

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4.00/5 (3 votes)

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ok so this is probably a really simple question but with all the googleable content on the net im having some trouble narrowing down the answer..

All I want to do is grab a piece of data out of a sql table and assign that piece of data to a variable,

eg.

string aPieceOfData = "A piece of data taken from a sql table"

I can setup a select statement without any problems but how do I use that select statement to grab the data and put it in a variable

Posted 19-Dec-11 9:15am

webpeon80

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3 solutions

Solution 3

C#

string ConnectionString = "Your Data Source";
string Val = "";
using (SqlConnection con = new SqlConnection(ConnectionString ))
{
    con.Open();
    using (SqlCommand com = new SqlCommand("SELECT Empname FROM Emp", con))
    {
         Val = com.ExecuteScalar(); 
    }
}

Posted 19-Dec-11 16:47pm

Muthu Nadar

Solution 4

Select count(*) as varname from tablename where condiotion=con

use this sql querry. U will get value into varname

using (SqlDataReader reader = com.ExecuteReader())
                        {
                        while (reader.Read())
                            {
                            int count = (int) reader["varname"];
                            Console.WriteLine("ID: {0}\n    {1}", varname);
                            }
                        }
                    }

Posted 19-Dec-11 17:23pm

santhosh-padamatinti

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OriginalGriff · Accepted Answer · 2011-12-19T09:20:00

Solution 1

Try:

C#

using (SqlConnection con = new SqlConnection(strConnect))
    {
    con.Open();
    using (SqlCommand com = new SqlCommand("SELECT iD, description FROM myTable", con))
        {
        using (SqlDataReader reader = com.ExecuteReader())
            {
            while (reader.Read())
                {
                int id = (int) reader["iD"];
                string desc = (string) reader["description"];
                Console.WriteLine("ID: {0}\n    {1}", iD, desc);
                }
            }
        }
    }

[edit]Typo: Caps lock on while typing... - OriginalGriff[/edit]

Posted 19-Dec-11 9:20am

OriginalGriff

Updated 19-Dec-11 9:21am

v2

Comments

Pete O'Hanlon 19-Dec-11 15:34pm

As the OP talks about retrieving a single value to assign to a variable, it would be better to use ExecuteScalar.

Sergey Alexandrovich Kryukov 19-Dec-11 18:39pm

Agree, but this gives the idea where the data comes from :-)
--SA

OriginalGriff 20-Dec-11 3:47am

Agreed - but I wanted to show different types of values.

Sergey Alexandrovich Kryukov 19-Dec-11 18:40pm

...so, my 5.
--SA

AmitGajjar 20-Dec-11 0:21am

Hi, your answer is correct but want to add more , if you would like to return only single cell information then you can use ExecuteScaler() insetead of ExecuteReader()

thanks
-amit.