Question

I have a WinForms project in C# that connects to a MySQL database. I’m trying to count the number of rows in the result, i can’t use RecordsAffected as this property only has the correct value after the read is complete and as you can see from the code below I need it before. Any idea’s on how to do this?

string sql = "SELECT * FROM Tigers WHERE Link='" + link + "'";

MySqlCommand cmd = new MySqlCommand(sql, conn);
MySqlDataReader rdr = cmd.ExecuteReader();

while (rdr.Read())
{
    if (rdr.RecordsAffected == 0)
    {
        //can't find in db               
    }
    else
    {
        //found at least 1 result
    }

Answer 1

You can use HasRows instead :

string sql = "SELECT * FROM Tigers WHERE Link='" + link + "'";

MySqlCommand cmd = new MySqlCommand(sql, conn);
MySqlDataReader rdr = cmd.ExecuteReader();

if(rdr.HasRows){
    while (rdr.Read())
    {
            //do stuff here
    }
} else {
    //nothing found
}

Edit : if you don’t need to read the data you retrieve from the database and just want the count you could use :

cmd.CommandText = "SELECT COUNT(*) FROM Tigers WHERE Link='" + link + "'";
Int32 count = (Int32) cmd.ExecuteScalar();