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Distribute your site's contents with RSS 2.0

, 28 Sep 2007
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Distribute your site's contents with RSS 2.0 using ASP.NET/VB.NET/MS SQL Server 2005.

Introduction

This is an easy way to distribute your site's content using RSS 2.0. The code pulls the items from a MS SQL Server database, and dynamically creates the XML using the XmlTextWriter object. You can filter the resulting items by using the create date with your T-SQL, or use the time to live.

If you do not understand the XML that is being created, please check out the following link for detailed information on the RSS 2.0 Standards: http://cyber.law.harvard.edu/rss/rss.html

If you prefer to code in C#, there in an example posted below by a CP member that will create the items. You would still need to create the parent XML tags by using the RSS 2.0 Standard, though.

Using the code

The .aspx page only requires these two lines of code.

<%@ Page Language="VB" AutoEventWireup="false" 
         CodeFile="rssFeed.aspx.vb" Inherits="rssFeed" %>
<%@ OutputCache Duration="1" VaryByParam="none" %>

Here is the code-behind:

Imports System
Imports System.Configuration
Imports System.Data
Imports System.Data.SqlClient
Imports System.Text
Imports System.Web
Imports System.Xml

Partial Class rssFeed
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, _
              ByVal e As System.EventArgs) Handles Me.Load

        Response.Clear()
        Response.ContentType = "text/xml"
        Dim objX As New XmlTextWriter(Response.OutputStream, Encoding.UTF8)

        objX.WriteStartDocument()
        objX.WriteStartElement("rss")
        objX.WriteAttributeString("version", "2.0")
        objX.WriteStartElement("channel")
        objX.WriteElementString("title", "RedChip News")
        objX.WriteElementString("link", "http://www.redchip.com")
        objX.WriteElementString("description", _
             "The latest headlines and articles from RedChip.")
        objX.WriteElementString("ttl", "5")


        Dim objConnection As New SqlConnection(_
            ConfigurationManager.ConnectionStrings(_
            "DatabaseConnectionString1").ToString)
        objConnection.Open()
        Dim sql As String = "SELECT Title, Summary, ArticleID, " & _ 
                "PostTime FROM tblArticles ORDER BY PostTime DESC"
        'Dim sql As String = "SELECT * FROM tblArticles"
        Dim objCommand As New SqlCommand(sql, objConnection)
        Dim objReader As SqlDataReader = objCommand.ExecuteReader()


        While objReader.Read()
            objX.WriteStartElement("item")
            objX.WriteElementString("title", objReader.GetString(0))
            objX.WriteElementString("description", objReader.GetString(1))
            objX.WriteElementString("link", _
                 "http://www.redchip.com/Articles/research.aspx" & _ 
                 "?ArticleID=" & CStr(objReader.GetInt16(2)))
            objX.WriteElementString("pubDate", _
                 objReader.GetDateTime(3).ToString("R"))
            objX.WriteEndElement()
        End While


        objReader.Close()
        objConnection.Close()

        objX.WriteEndElement()
        objX.WriteEndElement()
        objX.WriteEndDocument()
        objX.Flush()
        objX.Close()
        Response.End()

    End Sub
End Class

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

AdamNThompson
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United States United States
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Comments and Discussions

 
Generalgo with XML auto in SQLSERVER2005. PinmemberDileep.M28-Sep-07 19:47 

            string   select = "SELECT Title as title, Summary as description, 'http://www.redchip.com/Articles/research.aspx?ArticleID='+ArticleID   as link, PostTime as pubDate FROM   tblArticles item   ORDER BY PostTime DESC   FOR XML AUTO, ELEMENTS"
 

out put :
<item>
   <title>forms</title>
   <description>Value Added Tex Forms</description>
   <link>http://www.redchip.com/Articles/research.aspx?ArticleID=1</link>
   <pubDate>2007-03-13T00:00:00</pubDate>
</item>
......
 
code:
 

      public static string   ExecuteXMLReader(string selectStatement, string database, SqlConnection conn,SqlTransaction tx)
               {
                     string result = "";
                     SqlCommand cmd = null;
                     try
                     {
                           if (conn.State == ConnectionState.Closed) { conn.Open(); }
                           if ((conn != null) && (!conn.Database.Equals(database)))
                           {
                                 conn.ChangeDatabase(database);
                           }
                           cmd = conn.CreateCommand();
                           cmd.CommandText = selectStatement;
                           cmd.Transaction = tx;
                           XmlReader rdr = cmd.ExecuteXmlReader();
                           rdr.Read();
                           while (rdr.ReadState != ReadState.EndOfFile)
                           {
                                 result += rdr.ReadOuterXml();
                           }
                           rdr.Close();
 
                     }
                     catch
                     {
                           //throw new Exception();
                           return "";
 
                     }
                 
                     return result;
               }
        
 

           

 

 
Dileep.M
GeneralRe: go with XML auto in SQLSERVER2005. PinmemberDileep.M28-Sep-07 20:03 
GeneralRe: go with XML auto in SQLSERVER2005. [modified] PinmemberAdamNThompson29-Sep-07 8:03 
GeneralRe: go with XML auto in SQLSERVER2005. PinmemberDileep.M29-Sep-07 23:18 

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