從數據讀取資料方法

      自己初學C＃，感覺從數據據庫獲取資料挺難的，有點恐俱感。雖然自己有點怕，但我還是努力去學！今天做了一個小程式－－從數據庫中獲得資料輸出到控制台上。

using  System.Data.SqlClient;
static   void  Main( string [] args)
        {
             #region   連接數據庫
            SqlConnection dataConnection  =   new  SqlConnection();
             string  userName  =   " sa " ;
             string  password  =   " sh2_123 " ;
            dataConnection.ConnectionString  =   " User ID= "   +  userName  +   " ;Password= "   +  password  + " ;Initial Catalog=Northwind; "   +   " Data Source=CCM02\\SQLEXPRESS " ;
            dataConnection.Open();
             #endregion   
           
             #region  執行語句
            SqlCommand dataCommand  =   new  SqlCommand();
            dataCommand.Connection  =  dataConnection;
            dataCommand.CommandText  =   " select OrderID,OrderDate,ShippedDate,ShipName,ShipAddress,ShipCity,ShipCountry From Orders Where CustomerID='BLONP' " ;
            SqlDataReader datareader  =  dataCommand.ExecuteReader();    
             #endregion       
            
             #region  輸出得到資料
             while  (datareader.Read())
            { 
                 #region  定義變量對應到欄位
                 int  orderId  =  datareader.GetInt32( 0 );
                DateTime orderDate  =  datareader.GetDateTime( 1 );
                DateTime shipDate  =  datareader.GetDateTime( 2 );
                 string  shipName  =  datareader.GetString( 3 );
                 string  shipAddress  =  datareader.GetString( 4 );
                 string  shipCity  =  datareader.GetString( 5 );
                 string  shipCountry  =  datareader.GetString( 6 );
                 #endregion

                Console.WriteLine(
                     " Order {0}\n placed {1} \n shipped {2} \n "   +
                     " To Address {3} \n {4} \n {5} \n {6} \n\n " ,
                    orderId, orderDate, shipDate, shipName, shipAddress, shipCity, shipCountry);
            }
             #endregion
        }