Материал из .Net Framework эксперт
DbProviderFactory: create provider from SqlClient
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="ProviderAgnosticCode" %>
<!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>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h2>Employees</h2>
<asp:Literal runat="server" ID="HtmlContent" />
</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.rumon;
using System.Text;
using System.Web.Configuration;
public partial class ProviderAgnosticCode : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
string factory = WebConfigurationManager.AppSettings["factory"];
DbProviderFactory provider = DbProviderFactories.GetFactory(factory);
DbConnection con = provider.CreateConnection();
con.ConnectionString = WebConfigurationManager.ConnectionStrings["Northwind"].ConnectionString;
DbCommand cmd = provider.CreateCommand();
cmd.rumandText = WebConfigurationManager.AppSettings["employeeQuery"];
cmd.Connection = con;
con.Open();
DbDataReader reader = cmd.ExecuteReader();
StringBuilder htmlStr = new StringBuilder("");
while (reader.Read())
{
htmlStr.Append("<li>");
htmlStr.Append(reader["TitleOfCourtesy"]);
htmlStr.Append(" <b>");
htmlStr.Append(reader.GetString(1));
htmlStr.Append("</b>, ");
htmlStr.Append(reader.GetString(2));
htmlStr.Append(" - employee from ");
htmlStr.Append(reader.GetDateTime(6).ToString("d"));
htmlStr.Append("</li>");
}
reader.Close();
con.Close();
HtmlContent.Text = htmlStr.ToString();
}
}
File: Web.config
<?xml version="1.0"?>
<configuration xmlns="http://schemas.microsoft.ru/.NetConfiguration/v2.0">
<connectionStrings>
<add name="Northwind" connectionString="Data Source=localhost;Initial Catalog=Northwind;Integrated Security=SSPI"/>
</connectionStrings>
<appSettings>
<add key="factory" value="System.Data.SqlClient" />
<add key="employeeQuery" value="SELECT * FROM Employees" />
</appSettings>
<system.web>
<compilation debug="true"/>
<authentication mode="Windows"/>
</system.web>
</configuration>
