mygood.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>
	/// Mygood 的摘要说明。
	/// </summary>
	public class Mygood : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.Label Label1;
		protected System.Web.UI.WebControls.HyperLink HyperLink1;
		protected System.Web.UI.WebControls.DataGrid DataGrid1;
	
		private void Page_Load(object sender, System.EventArgs e)
		{
			Response.Write(Session["username"].ToString()+"你好!你购买的商品为>>");
			if(!Page.IsPostBack)
			{
				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 shopping where 客户名='"+Session["username"].ToString()+"'";
			OleDbCommand comm=new OleDbCommand(strsql,conn);
			comm.CommandType=CommandType.Text;
			OleDbDataAdapter oda=new OleDbDataAdapter();
			oda.SelectCommand=comm;
			DataTable da= new DataTable("shopping");
			DataSet ds=new DataSet();
			DataTableCollection dc=ds.Tables;
			dc.Add(da);
			oda.Fill(da);
			DataView dv=ds.Tables["shopping"].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.EditCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_EditCommand);
			this.DataGrid1.DeleteCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_DeleteCommand);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void DataGrid1_EditCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
		{
			Response.Redirect("charge.aspx?check="+e.Item.Cells[0].Text);
		}

		private void DataGrid1_DeleteCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
		{
			string strcnn="Provider=Microsoft.Jet.OleDb.4.0;";
			strcnn+=@"Data Source=";
			strcnn+=Server.MapPath("usergoods.mdb");
			OleDbConnection conn=new OleDbConnection(strcnn);
			conn.Open();
			string strsql="select 数量 from shopping where 客户名='"+Session["username"].ToString()+"' and 商品ID='"+e.Item.Cells[0].Text+"'";
			OleDbCommand comm=new OleDbCommand(strsql,conn);
			comm.CommandType=CommandType.Text;
			int num=(int)comm.ExecuteScalar();
			num--;
			if(num==0)
			{
				comm.CommandText="delete from shopping where 商品ID='"+e.Item.Cells[0].Text+"' and 客户名='"+Session["username"].ToString()+"'";
				comm.ExecuteNonQuery();
			}
			else
			{
				comm.CommandText="select 价格 from goods where 商品号='"+e.Item.Cells[0].Text+"'";
				int money=(int)comm.ExecuteScalar();
				comm.CommandText="select 应付金额 from shopping where 商品ID='"+e.Item.Cells[0].Text+"' and 客户名='"+Session["username"].ToString()+"'";
				int payAll=(int)comm.ExecuteScalar();
				payAll-=money;
				comm.CommandText="update shopping set 数量='"+num.ToString()+"',应付金额='"+payAll.ToString()+"' where 商品ID='"+e.Item.Cells[0].Text+"' and 客户名='"+Session["username"].ToString()+"'";
				comm.ExecuteNonQuery();
			}
			comm.CommandText="select 数量 from goods where 商品号='"+e.Item.Cells[0].Text+"'";
			int num1=(int)comm.ExecuteScalar();
			num1++;
			comm.CommandText="update goods set 数量='"+num1.ToString()+"' where 商品号='"+e.Item.Cells[0].Text+"'";
			comm.ExecuteNonQuery();
			Label1.Text="退货成功！";
			conn.Close();
			DataGrid();
		}
	}
}