How do I retrieve the result of an ADO.NET SqlCommand?

Ok either I’m really tired or really thick at the moment, but I can’t seem to find the answer for this

I’m using ASP.NET and I want to find the amount of rows in my table.

I know this is the SQL code: select count(*) from topics, but how the HECK do I get that to display as a number?

All I want to do is run that code and if it = 0 display one thing but if it’s more than 0 display something else. Help please?

This is what I have so far

string selectTopics = "select count(*) from topics";
// Define the ADO.NET Objects
SqlConnection con = new SqlConnection(connectionString);
SqlCommand topiccmd = new SqlCommand(selectTopics, con);
if (topiccmd == 0)
    {
        noTopics.Visible = true;
        topics.Visible = false;
    }

but I know I’m missing something seriously wrong. I’ve been searching for ages but can’t find anything.

PHP is so much easier. 🙂

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Answers:

Method 1

Method 2

Method 3

Answers:

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Method 1

Note that you must open the connection and execute the command before you can access the result of the SQL query. ExecuteScalar returns a single result value (different methods must be used if your query will return an multiple columns and / or multiple rows).

Notice the use of the using construct, which will safely close and dispose of the connection.

string selectTopics = "select count(*) from topics";
// Define the ADO.NET Objects
using (SqlConnection con = new SqlConnection(connectionString))
{
   SqlCommand topiccmd = new SqlCommand(selectTopics, con);
   con.Open();
   int numrows = (int)topiccmd.ExecuteScalar();
   if (numrows == 0)
    {
        noTopics.Visible = true;
        topics.Visible = false;
    }
}

Method 2

ExecuteScalar is what you’re looking for. (method of SqlCommand)

Btw, stick with C#, there’s no way PHP is easier. It’s just familiar.

Method 3

You need to open the connection
This might work :

SqlConnection sqlConnection1 = new SqlConnection("Your Connection String");
SqlCommand cmd = new SqlCommand();
SqlDataReader reader;

cmd.CommandText = "select count(*) from topics";
cmd.CommandType = CommandType.Text;
cmd.Connection = sqlConnection;
sqlConnection1.Open();

reader = cmd.ExecuteReader();
// Data is accessible through the DataReader object here.

sqlConnection1.Close();

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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