reader.Read() is always empty…but why?

Question

i have a problem. So i have the problem, that the if-query is not working. he will always jump in the else-path. But in the database is a entry, so it isnt empty...

      Jump:
            string query = "SELECT * FROM `depositRequests` LIMIT 1";
            MySqlCommand cmd = new MySqlCommand(query, connection);
            MySqlDataReader reader = cmd.ExecuteReader();
            Thread.Sleep(1000);
            reader.Read();

            Log.Info("Durchlauf: " + i);

            if (reader.Read())
            {
                SteamID SteamAddID = new SteamID(reader.GetString(2));
                string authCode = reader.GetString(3);

                Log.Info("SteamAddID: " + SteamAddID);
                Log.Info("AuthCode: " + authCode);
                Bot.log.Success("Add SteamAddID: " + SteamAddID + "AuthCode: " + authCode);

                AddFriendForTrade(SteamAddID, authCode);
            }
            else
            {
                Bot.log.Warn("No Data found! Waiting for Deposit Request");
                Thread.Sleep(60000);
                reader.Close();
                i++;
                goto Jump;
            }

So why he always jump in the else-path although there is an entry in the database?

Thank you for your help!

Answer 1

Because you are getting only one record, then reading it before if statement on this line:

Thread.Sleep(1000);
reader.Read(); <---

Since there is no second record,your second call to Read always returns false .

You should remove this line and call Read only once in your if statement or store the result of Read method and use that variable within the if :

bool isRecordExists = reader.Read();
if(isRecordExists)
{
   ...
}