string connStr = "Database=start;datasource=127.0.0.1;port=3306;userid=root;pwd=yangyang21";
            MySql.Data.MySqlClient.MySqlConnection conn = new MySqlConnection(connStr);
            conn.Open();

            MySqlCommand cmd = new MySqlCommand("select * from lol", conn);
            MySqlDataReader r = cmd.ExecuteReader();
            while (r.Read()) {
                Console.WriteLine(r.GetString("name") + ":" + r.GetString("level") + "级！");
            }

                MySqlCommand cmd = new MySqlCommand("select * from lol where name=?name", conn);
                cmd.Parameters.Add("?name", MySqlDbType.String).Value = "锤石";

　　　　　　conn.Close();