C#编程

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OrderData.cs：源码内容

							using System;
using System.EnterpriseServices;
using System.Data;
using System.Data.SqlClient;
namespace Wrox.ProCSharp.EnterpriseServices
{
	public interface IOrderUpdate
	{
		void Insert(Order order);
		void Update(Order order);
	}
	[Transaction(TransactionOption.Required)]
	[EventTrackingEnabled(true)]
	[ConstructionEnabled(true, Default="server=localhost;database=northwind;trusted_connection=true")]
	public class OrderData : ServicedComponent, IOrderUpdate
	{
		private string connectionString = null;
		public OrderData()
		{
		}
		#region IUpdateOrder Members
		[AutoComplete()]
		public void Insert(Order order)
		{
			SqlConnection connection = new SqlConnection(connectionString);
			try
			{			
				SqlCommand command = connection.CreateCommand();
				command.CommandText = "INSERT INTO Orders (CustomerId, OrderDate, ShipAddress, ShipCity, ShipCountry)" +
					"VALUES(@CustomerId, @OrderDate, @ShipAddress, @ShipCity, @ShipCountry)";
				command.Parameters.Add("@CustomerId", order.CustomerId);
				command.Parameters.Add("@OrderDate", order.OrderDate);
				command.Parameters.Add("@ShipAddress", order.ShipAddress);
				command.Parameters.Add("@ShipCity", order.ShipCity);
				command.Parameters.Add("@ShipCountry", order.ShipCountry);
				connection.Open();
				int rows = command.ExecuteNonQuery();
				if (rows != 1)
					throw new Exception("error");
				command.CommandText = "SELECT @@IDENTITY AS 'Identity'";
				object identity = command.ExecuteScalar();
				order.SetOrderId(Convert.ToInt32(identity));
				OrderLineData updateOrderLine = new OrderLineData();
				foreach (OrderLine orderLine in order.OrderLines)
				{
					updateOrderLine.Insert(order.OrderId, orderLine);
				}
			}
			catch (Exception ex)
			{
				System.Windows.Forms.MessageBox.Show(ex.Message);
				throw;
			}
			finally
			{
				connection.Close();
			}
		}
		public void Update(Order order)
		{
		}
		#endregion
	
		protected override void Construct(string s)
		{
			connectionString = s;
		}
	}
}

						