ASP.NET Tutorial/ADO.net Database/MultipleActiveResultSets — различия между версиями
Admin (обсуждение | вклад) м (1 версия) |
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(нет различий)
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Текущая версия на 14:56, 26 мая 2010
MARS feature on the Employees table of the Northwind database
<source lang="csharp">
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs"
Inherits="Default"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server">
<title>MARS</title>
</head> <body>
<form id="form1" runat="server"> <asp:Button ID="Button1" runat="server" Text="Go" OnClick="Button1_Click" />
<asp:DataGrid ID="grid" runat="server" CellPadding="4" ForeColor="#333333" GridLines="None" > <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" /> <EditItemStyle BackColor="#2461BF" /> <SelectedItemStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" /> <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" /> <AlternatingItemStyle BackColor="White" /> <ItemStyle BackColor="#EFF3FB" /> <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" /> </asp:DataGrid> </form>
</body> </html> File: Default.aspx.cs using System; using System.Data; using System.Data.Sql; using System.Data.SqlClient; using System.Configuration; using System.Collections; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls;
public partial class Default : System.Web.UI.Page {
protected void Button1_Click(object sender, EventArgs e) { string connString = "MultipleActiveResultSets=true;SERVER=(local)\\SQLEXPRESS;ATTACHDBFILENAME=|DataDirectory|northwind.mdf;INTEGRATED SECURITY=sspi;USER INSTANCE=false;"; using (SqlConnection conn = new SqlConnection(connString)) { SqlCommand cmd1 = new SqlCommand("SELECT employeeid, firstname, lastname FROM employees", conn); cmd1.Connection.Open(); SqlDataReader reader = cmd1.ExecuteReader(); while (reader.Read()) { string firstNameReverted = reader["firstname"].ToString(); char[] buf = firstNameReverted.ToCharArray(); Array.Reverse(buf); firstNameReverted = new string(buf); int id = (int)reader["employeeid"]; SqlCommand cmd2 = new SqlCommand("UPDATE employees SET firstname=@newFirstName WHERE employeeid=@empID", conn); cmd2.Parameters.AddWithValue("@newFirstName", firstNameReverted); cmd2.Parameters.AddWithValue("empID", id); cmd2.ExecuteNonQuery(); } reader.Close(); grid.DataSource = cmd1.ExecuteReader(); grid.DataBind(); cmd1.Connection.Close(); } }
}</source>