C# - How to parametrize SQL query with MySqlAdapter

Question

I'm trying to run a SQL query using MySqlAdapter so it returns the data in a DataTable.

I'm having troubles with the parametrization. Basically it doesn't return anything and it should be returning 2 rows.

I have this code:

        using (MySqlConnection connection = new MySqlConnection(CONSTANTS.dbCONNECTSTRING))
        {
            string sqlQuery = $"SELECT * FROM tfg_bcovi.User where userName= '@userName'";
            MySqlCommand command = new MySqlCommand(sqlQuery, connection);
            command.Parameters.Add(new MySqlParameter("@userName", userCtrl.UserName));

            MySqlDataAdapter dataAdapter = new MySqlDataAdapter(command);

            DataSet dataSet = new DataSet();
            dataAdapter.Fill(dataSet);

            DataTable dtResults = dataSet.Tables[0];           
        }

I checked and userCtrl.UserName have the correct value so I'm asuming something is wrong with parametrization.

The problem as I said before, is that dtResults ends up empty when it whould have at least 2 rows. I checked running the query in SQL.

What am I doing wrong?

Thanks!

Answer 1

Just remove the single quotes around the parameter. Your drive handles that for you already.

This:

string sqlQuery = $"SELECT * FROM tfg_bcovi.User where userName= '@userName'";

Should be:

string sqlQuery = $"SELECT * FROM tfg_bcovi.User where userName= @userName";