ASP.NET Tutorial/ADO.net Database/DbDataReader — различия между версиями

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Текущая версия на 11:57, 26 мая 2010

Using Multiple ResultSets in a single DbDataReader

<%@ Page Language="C#" 
         AutoEventWireup="true" 
         CodeFile="Default.aspx.cs" 
         Inherits="MultipleResultSets" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
   <title>Using Multiple ResultSets in a single DbDataReader</title>
</head>
<body>
   <form id="form1" runat="server">
      <div id="container">
      <asp:GridView ID="grdBooks" runat="server" />
      <h2>Authors</h2>
      <asp:GridView ID="grdAuthors" runat="server" />
      
         <asp:Label ID="labMsg" runat="server" />
         
      </div>
   </form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Configuration;
public partial class MultipleResultSets : System.Web.UI.Page
{
   protected void Page_Load(object sender, EventArgs e)
   {
      string connString = ConfigurationManager.ConnectionStrings["Northwind"].ConnectionString;
      SqlConnection conn = null;
      SqlDataReader reader = null;
      try
      {
         conn = new SqlConnection(connString);
         conn.Open();
         string sql = "SELECT * FROM Products; SELECT * FROM Customers;";
         SqlCommand cmd = new SqlCommand(sql, conn);
         reader = cmd.ExecuteReader();
         grdAuthors.DataSource = reader;
         grdAuthors.DataBind();
         reader.NextResult();
         grdBooks.DataSource = reader;
         grdBooks.DataBind();

      }
      catch (Exception ex)
      {
          labMsg.Text = "Error occurred accessing the database";
          labMsg.Text += "<br/>" + ex.Message;
      }
      finally
      {
         if (reader != null) reader.Close();
         if (conn != null) conn.Close();
      }
    }
}
Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/ADO.net_Database/DbDataReader&oldid=2752»