ASP.NET Tutorial/ADO.net Database/to XML

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Retrieving XML from SQL Server sing FOR XML AUTO (C#)

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
File: Default.aspx.cs
using System;
using System.Data;
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;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Xml;
using System.Xml.XPath;
using System.Xml.Xsl;
public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string connStr = "database=Northwind;Data Source=.\\SQLEXPRESS;User id=Tom;pwd=password";
        XmlDocument x = new XmlDocument();
        XPathNavigator xpathnav = x.CreateNavigator();
        using (SqlConnection conn = new SqlConnection(connStr))
        {
            conn.Open();
            SqlCommand command = new SqlCommand("select * from Customers as Customer for XML AUTO, ELEMENTS", conn);
            using (XmlWriter xw = xpathnav.PrependChild())
            {
                xw.WriteStartElement("Customers");
                using (XmlReader xr = command.ExecuteXmlReader())
                {
                    xw.WriteNode(xr, true);
                }
                xw.WriteEndElement();
            }
        }
        Response.ContentType = "text/xml";
        x.Save(Response.Output);
    }
}


Retrieving XML from SQL Server sing FOR XML AUTO (VB)

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
File: Default.aspx.vb
Imports System.Data
Imports System.Data.SqlClient
Imports System.IO
Imports System.Xml
Imports System.Xml.XPath
Imports System.Xml.Xsl
Partial Class _Default
    Inherits System.Web.UI.Page
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) _
           Handles Me.Load
        Dim connStr As String = "database=Northwind;Data Source=.\SQLEXPRESS;" & _
                " User id=Tom;pwd=password"
        Dim x As New XmlDocument()
        Dim xpathnav As XPathNavigator = x.CreateNavigator()
        Using conn As New SqlConnection(connStr)
            conn.Open()
            Dim command As New SqlCommand("select * from Customers as Customer " & _
                "for XML AUTO, ELEMENTS", conn)
            Using xw As XmlWriter = xpathnav.PrependChild()
                xw.WriteStartElement("Customers")
                Using xr As XmlReader = command.ExecuteXmlReader()
                    xw.WriteNode(xr, True)
                End Using
                xw.WriteEndElement()
            End Using
        End Using
        Response.ContentType = "text/xml"
        x.Save(Response.Output)
    End Sub
End Class


Run a query against a SQL Server database with an XML typed column. It then displays results in a tree-view.

<%@ 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>XML from SQL 2005</title>
</head>
<body>
    <div id="pageContent">
        <form id="form1" runat="server">
            <asp:Button ID="GetDataButton" runat="server" Text="Go get data" 
                OnClick="GetDataButton_Click" />
                <br /><br />
            <asp:TreeView ID="TreeView1" runat="server">
            </asp:TreeView>
        </form>
    </div>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Data.SqlClient;
using System.Data.SqlTypes;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Xml;

public partial class Default : System.Web.UI.Page
{
  private TreeNode Root;
  protected void GetDataButton_Click(object sender, EventArgs e)
  {
    string connString = "SERVER=(local)\\SQLEXPRESS;ATTACHDBFILENAME=|DataDirectory|mydata.mdf;INTEGRATED SECURITY=sspi"; //;USER INSTANCE=true;";
    using (SqlConnection conn = new SqlConnection(connString))
    {
      Root = new TreeNode("Families");
      TreeView1.Nodes.Add(Root);
      string cmdText = "SELECT * FROM SampleData";
      SqlCommand cmd = new SqlCommand(cmdText, conn);
      cmd.Connection.Open();
      SqlDataReader reader = cmd.ExecuteReader();
      while (reader.Read())
      {
        SqlXml xml = reader.GetSqlXml(1);
        ProcessData(xml);
      }
      reader.Close();
      cmd.Connection.Close();
    }
  }
  private void ProcessData(SqlXml xml)
  {
    XmlReader reader = xml.CreateReader();
    TreeNode familyNode=null, parentsNode=null, childrenNode=null;
    while (reader.Read())
    {
      if (reader.Depth == 1 && reader.NodeType == XmlNodeType.Element)
      {
        familyNode = new TreeNode(reader.ReadElementContentAsString());
        Root.ChildNodes.Add(familyNode);
        parentsNode = new TreeNode("Parents");
        childrenNode = new TreeNode("Children");
        familyNode.ChildNodes.Add(parentsNode);
        familyNode.ChildNodes.Add(childrenNode);
      }
      if (reader.Depth == 2 && reader.NodeType == XmlNodeType.Element)
      {
        string name = reader["name"];
        string role = reader["Role"];
        TreeNode member = new TreeNode(name);
        if (role.ToLowerInvariant().Equals("father") || role.ToLowerInvariant().Equals("mother"))
          parentsNode.ChildNodes.Add(member);
        else
          if (role.ToLowerInvariant().Equals("child"))
            childrenNode.ChildNodes.Add(member);
      }
    }
  }
}


The ASPX Page and XSLT to style the XML from SQL Server (C#)

<%@ Page Language="C#" 
         AutoEventWireup="true" 
         CodeFile="Default.aspx.cs" 
         Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
                      "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
                      
                      
<asp:xml id="Xml1" runat="server" transformsource="~/Data.xslt"/>
File:
using System;
using System.Data;
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;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Xml;
using System.Xml.XPath;
using System.Xml.Xsl;
public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string connStr = "database=Northwind;Data Source=.\\SQLEXPRESS;User id=Tom;pwd=password";
        XmlDocument x = new XmlDocument();
        XPathNavigator xpathnav = x.CreateNavigator();
        using (SqlConnection conn = new SqlConnection(connStr))
        {
            conn.Open();
            SqlCommand command = new SqlCommand("select * from Customers as Customer for XML AUTO, ELEMENTS", conn);
            using (XmlWriter xw = xpathnav.PrependChild())
            {
                xw.WriteStartElement("Customers");
                using (XmlReader xr = command.ExecuteXmlReader())
                {
                    xw.WriteNode(xr, true);
                }
                xw.WriteEndElement();
            }
        }
        Xml1.XPathNavigator = xpathnav;
    }
}
File: Data.xslt
<?xml version="1.0" encoding="utf-8" ?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
    <xsl:output method="html"/>
    <xsl:template match="/">
        <h3>List of Customers</h3>
        <table border="1">
            <tr>
                <td>Company Name</td><td>Contact Name</td><td>Contact Title</td>
            </tr>
            <xsl:apply-templates select="//Customer"/>
        </table>
    </xsl:template>
    <xsl:template match="Customer">
        <tr>
            <td><xsl:value-of select="CompanyName"/></td>
            <td><xsl:value-of select="ContactName"/></td>
            <td><xsl:value-of select="ContactTitle"/></td>
        </tr>
    </xsl:template>
</xsl:stylesheet>


The ASPX Page and XSLT to style the XML from SQL Server (VB)

<%@ Page Language="VB" 
         AutoEventWireup="false" 
         CodeFile="Default.aspx.vb" 
         Inherits="_Default" %>
         
         
<asp:xml id="Xml1" runat="server" transformsource="~/Data.xslt"/>
File: Data.xslt
Imports System.Data
Imports System.Data.SqlClient
Imports System.IO
Imports System.Xml
Imports System.Xml.XPath
Imports System.Xml.Xsl
Partial Class _Default
    Inherits System.Web.UI.Page
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) _
           Handles Me.Load
        Dim connStr As String = "database=Northwind;Data Source=.\SQLEXPRESS;" & _
                " User id=Tom;pwd=password"
        Dim x As New XmlDocument()
        Dim xpathnav As XPathNavigator = x.CreateNavigator()
        Using conn As New SqlConnection(connStr)
            conn.Open()
            Dim command As New SqlCommand("select * from Customers as Customer " & _
                "for XML AUTO, ELEMENTS", conn)
            Using xw As XmlWriter = xpathnav.PrependChild()
                xw.WriteStartElement("Customers")
                Using xr As XmlReader = command.ExecuteXmlReader()
                    xw.WriteNode(xr, True)
                End Using
                xw.WriteEndElement()
            End Using
        End Using
        Xml1.XPathNavigator = xpathnav
    End Sub
End Class
File: Data.xslt
<?xml version="1.0" encoding="utf-8" ?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
    <xsl:output method="html"/>
    <xsl:template match="/">
        <h3>List of Customers</h3>
        <table border="1">
            <tr>
                <td>Company Name</td><td>Contact Name</td><td>Contact Title</td>
            </tr>
            <xsl:apply-templates select="//Customer"/>
        </table>
    </xsl:template>
    <xsl:template match="Customer">
        <tr>
            <td><xsl:value-of select="CompanyName"/></td>
            <td><xsl:value-of select="ContactName"/></td>
            <td><xsl:value-of select="ContactTitle"/></td>
        </tr>
    </xsl:template>
</xsl:stylesheet>


XML query

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="XmlQuery" %>
<!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>
    <asp:Literal id="XmlText" runat="server"></asp:Literal>
    </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.Web.Configuration;
using System.Data.SqlClient;
using System.Xml;
using System.Text;
public partial class XmlQuery : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    string connectionString = WebConfigurationManager.ConnectionStrings["Northwind"].ConnectionString;
    string customerQuery = "SELECT FirstName, LastName FROM Employees FOR XML AUTO, ELEMENTS";
    SqlConnection con = new SqlConnection(connectionString);
    SqlCommand com = new SqlCommand(customerQuery, con);
    StringBuilder str = new StringBuilder();
    try
    {
      con.Open();
      XmlReader reader = com.ExecuteXmlReader();
      while (reader.Read())
      {
        if ((reader.Name == "Employees") && (reader.NodeType == XmlNodeType.Element))
        {
          reader.ReadStartElement("Employees");
          str.Append(reader.ReadElementString("FirstName"));
          str.Append(" ");
          str.Append(reader.ReadElementString("LastName"));
          str.Append("<br>");
          reader.ReadEndElement();
        }
      }
      reader.Close();
    }
    finally
    {
      con.Close();
    }
    XmlText.Text = str.ToString();
    }
}
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