shopping.aspx.cs

有关购物的程序

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Data.OleDb;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace shopping.受保护窗体
{
	/// <summary>
	/// shopping1 的摘要说明。
	/// </summary>
	public class shopping1 : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.HyperLink HyperLink1;
		protected System.Web.UI.WebControls.Label Label1;
		protected System.Web.UI.WebControls.HyperLink HyperLink2;
		protected System.Web.UI.WebControls.DataGrid DataGrid1;
	
		private void Page_Load(object sender, System.EventArgs e)
		{
			if(!Page.IsPostBack)
			{
				Label1.Text=Session["username"].ToString()+"你好!欢迎来到快乐购物中心!";
				DataGrid();
			}
		}
		private void DataGrid()
		{
			string str="Provider=Microsoft.Jet.OleDb.4.0;";
			str+=@"Data Source=";
			str+=Server.MapPath("usergoods.mdb");
			OleDbConnection conn=new OleDbConnection(str);
			conn.Open();
			string strsql="select * from goods order by 商品号";
			OleDbCommand comm=new OleDbCommand(strsql,conn);
			comm.CommandType=CommandType.Text;
			OleDbDataAdapter oda=new OleDbDataAdapter();
			oda.SelectCommand=comm;
			DataTable da= new DataTable("goods");
			DataSet ds=new DataSet();
			DataTableCollection dc=ds.Tables;
			dc.Add(da);
			oda.Fill(da);
			DataView dv=ds.Tables["goods"].DefaultView;
			DataGrid1.DataSource=dv;
			DataGrid1.DataBind();
			conn.Close();
			
		}

		#region Web 窗体设计器生成的代码
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{    
			this.DataGrid1.PageIndexChanged += new System.Web.UI.WebControls.DataGridPageChangedEventHandler(this.DataGrid1_PageIndexChanged);
			this.DataGrid1.EditCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_EditCommand);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void DataGrid1_EditCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
		{
			string str="Provider=Microsoft.Jet.OleDb.4.0;";
			str+=@"Data Source=";
			str+=Server.MapPath("usergoods.mdb");
			OleDbConnection conn=new OleDbConnection(str);
			conn.Open();
			string goodID=e.Item.Cells[0].Text;
			string strsql="select count(*) from shopping where 客户名='"+Session["username"].ToString()+"' and 商品ID='"+goodID+"'";
			OleDbCommand comm=new OleDbCommand(strsql,conn);
			comm.CommandType=CommandType.Text;
			int num=(int)comm.ExecuteScalar();
			comm.CommandText="select 数量 from goods where 商品号='"+goodID+"'";
			int num2=(int)comm.ExecuteScalar();
			if(num2==0)
			{
				Response.Write("<script language=javascript>alert('该商品暂时缺货！请选择其它的商品！')</script>");
				conn.Close();
			}
			else
			{
				if(num!=0)
				{
					comm.CommandText="select 数量 from shopping where 客户名='"+Session["username"].ToString()+"' and 商品ID='"+goodID+"'";
					int num1=(int)comm.ExecuteScalar();
					comm.CommandText="select 应付金额 from shopping where 客户名='"+Session["username"].ToString()+"' and 商品ID='"+goodID+"'";
					int count=(int)comm.ExecuteScalar();
					count+=int.Parse(e.Item.Cells[2].Text);
					num1++;
					comm.CommandText="update shopping set 数量="+num1+",应付金额="+count+" where 客户名='"+Session["username"].ToString()+"' and 商品ID='"+goodID+"'";
					comm.ExecuteNonQuery();
					
				}
				else
				{
					comm.CommandText="select 供应商 from Mygoods where 商品ID='"+goodID+"'";
					
					comm.CommandText="insert into shopping values('"+Session["username"].ToString()+"','"+goodID+"','"+comm.ExecuteScalar().ToString()+"','"+e.Item.Cells[1].Text+"',1,'"+e.Item.Cells[2].Text+"',0)";
					comm.ExecuteNonQuery();
				}
				num2--;
				comm.CommandText="update goods set 数量="+num2.ToString()+" where 商品号='"+goodID+"'";
				comm.ExecuteNonQuery();
				conn.Close();
				Response.Redirect("Mygood.aspx");
			}
		}

		private void DataGrid1_PageIndexChanged(object source, System.Web.UI.WebControls.DataGridPageChangedEventArgs e)
		{
			DataGrid1.CurrentPageIndex=e.NewPageIndex;
			DataGrid();
		}
	}
}