.net 连接MySql

String  stringconnStr = String.Format("server={0};user id={1}; password={2}; database=test; pooling=false","localhost", "root", "123456");
            MySqlConnection conn = new MySqlConnection(stringconnStr);
            conn.Open();
            String sql = "select * from stutbl";
            //MySqlCommand command = new MySqlCommand(sql, conn);   //建立 Command 对象
            //MySqlDataReader reder = command.ExecuteReader();
            
            //while (reder.Read())
            //{
            //    //读出内容列
            //    string str = reder["user_name"].ToString();
            //    //读取分类列
            //    string str1 = reder["user_pass"].ToString();
            //    //分别为文本框加载数据
            //}

            MySqlDataAdapter da = new MySqlDataAdapter(sql, conn);
            DataSet ds = new DataSet();//建立DataSet实例
            da.Fill(ds, "testtabel");//使用DataAdapter的Fill方法(填充)，调用SELECT命令
            DataTable tabel = ds.Tables["testtabel"];
            foreach (DataRow drCurrent in tabel.Rows)
            {
                String aa = drCurrent["user_name"].ToString();
            }
            conn.Close();//关闭数据库

using MySql.Data.MySqlClient;