Mahendra's Weblog

XMl work Shop 21

mranaw01 — Thu, 26 Jun 2008 05:08:06 +0000

Here is another example where xml is created form a database query. In this case “for xml” clause is not used in the query since the format of the xml file needs to be a custom one. otherwise the xml document could have been created using only few code lines.

[WebMethod]
public XmlDocument Get_CC4(string CC)
{

        CC = “KSMG01″ + CC.Trim();
        //YEAR = YEAR.Trim();
        //PERIOD = PERIOD.Trim();
        SqlCommand cmd = new SqlCommand();
        cmd.Connection = new SqlConnection(“server=xx;database=xx;Integrated Security=SSPI”);
        cmd.CommandType = CommandType.Text;
        cmd.CommandText = ” SELECT SUBSTRING(KSTAR,7,4) AS AC,” +
                            ” WKGBTR AS AMT” +
                            ” FROM costcenter” +
                            ” WHERE GJAHR = ’2008′ AND OBJNR = ‘” + CC + “‘ AND PERIO <= ’03′ ” +
                            ” ORDER BY KSTAR”;

        cmd.Connection.Open();
        SqlDataReader xr = cmd.ExecuteReader();
        XmlDataDocument xd = new XmlDataDocument();
        //create XML declaration section
        //XmlNode xn = xd.CreateNode(XmlNodeType.XmlDeclaration, “”, “”);
        //xd.AppendChild(xn);
        XmlElement xe0, xe1, xe2, xe31, xe32;
        //create the root element
        xe0 = xd.CreateElement(“data”);
        xd.AppendChild(xe0);
        xe1 = xd.CreateElement(“variable”);
        xe1.SetAttributeNode(“name”, “”);
        xe1.SetAttribute(“name”, “”, “cc”);
        xe0.AppendChild(xe1);
        XmlText xt;
        xe2 = xd.CreateElement(“row”);
        xe1.AppendChild(xe2);
        xe31 = xd.CreateElement(“column”);
        xt = xd.CreateTextNode(“ac”);
        xe31.AppendChild(xt);
        xe2.AppendChild(xe31);
        xe32 = xd.CreateElement(“column”);
        xt = xd.CreateTextNode(“amt”);
        xe32.AppendChild(xt);
        xe2.AppendChild(xe32);
        while (xr.Read())
        {
            xe2 = xd.CreateElement(“row”);
            xe1.AppendChild(xe2);
            xe31 = xd.CreateElement(“column”);
            xt = xd.CreateTextNode(xr.GetString(0));
            xe31.AppendChild(xt);
            xe2.AppendChild(xe31);
            xe32 = xd.CreateElement(“column”);
            xt = xd.CreateTextNode(Convert.ToString(xr.GetSqlDecimal(1)));
            xe32.AppendChild(xt);
            xe2.AppendChild(xe32);
        }
        xr.Close();
        cmd.Connection.Close(); ;
        //DataSet xdd = xdaSet;
        return xd;
    }

publishing a windows media vedio in a web page

mranaw01 — Thu, 26 Jun 2008 03:49:36 +0000

http://www.w3.org/1999/xhtml“>

Untitled Page

Exercise 7

mranaw01 — Thu, 19 Jun 2008 07:02:01 +0000

Hello.aspx

<%@ Page language=”c#” Codebehind=”Hello.aspx.cs” AutoEventWireup=”false” Inherits=”Exercise7.Hello” %>

WebForm1

Hello.aspx.cs code behinde page

Button click event handler code

private void Button1_Click(object sender, System.EventArgs e)
  {
   Label1.Text=TextBox1.Text;
  }

Result

“Hello , “, Mahendra

mranaw01 — Thu, 19 Jun 2008 06:35:32 +0000

http://en.wikipedia.org/wiki/Secure_Shell

https://www.sdn.sap.com/irj/sdn/maxdb

http://java.sun.com/products/jndi/tutorial/index.html

Non Technical Report – Data Connectivity and Delivery in client server Environment

mranaw01 — Thu, 19 Jun 2008 06:33:54 +0000

       Most of the client server and e-commerce environments have some form of persistent data. Hence Data connectivity and delivery from these persistent storages takes a major role in client server environments.
      Some of more popular data connectivity techniques are jdbc (java database connectivity ) which is used for java language to connect to various databases. Like jdbc, odbc (open database connectivity) and oledb (Object Linking and Embedding, Database) used in Microsoft windows platform to connect to various forms of data sources ranging from text files to databases.
         There are numerous types of content that’s delivered across networks. For example media forms like voice over IP, images, Music, Video becoming increasing popular over the internet. Due to firewall restrictions and vendor independence xml is also becoming popular form of data delivery.
          When it comes to data delivery security seems to be one of main concerns. Hence comes encrypted data delivery techniques like https (hyper text transfer protocol secure) and SSH (secure shell). This allows confidentially of data deliverd over public network like internet.
         Also as volume of data that’s delivered across net works increases compression techniques and streaming techniques become increasingly important. Pdf ,zip ,rar for files and jpeg for image and mpeg for audio and video are some popular forms of compress content types.

Technical Report – Data Connectivity and Delivery in client server Environment

mranaw01 — Wed, 18 Jun 2008 07:20:10 +0000

Following article is about two different database /directory connection techniques that can be used in a client server or e commerce environment. Focus here is on brief overview and a sample of each technique, rather than the architecture.

Sqlxml
SqlXml Gives ability to do curd operations using xml over http for databases (Oracle, Ms) . It is an easy to setup and only needs the database and web server. But best use to get an xml output from a sql query over http due to security concerns.
oracle’s provides this feature using xsql servlet in a servlet container like tomcat. Similarly with Ms Sql server this feature is available with IIS (Internet information server).
Following is sample template for IIS.

select ac,amt
from costcenter
WHERE year = @YEAR
FOR XML RAW ,XMLDATA

JNDI
The Java Naming and Directory InterfaceTM (JNDI) is an application programming interface (API) that provides naming and directory functionality to applications written using the JavaTM programming language. It is defined to be independent of any specific directory service implementation.
In following a java base application residing in tomcat use AD (active directory) to authenticate its users. This is useful in an intranet and extranet application. Example if the contractors working for a company is given AD accounts and roles to grant various access rights.
following sample connection string in server.xml helps to establish the connection with AD.

Then in web.xml file of the application use the relevant security roles and constraints from AD to authenticate users.

Conclusion
New Data connection techniques emerge all the time in client server environment. Table adapter and Linq are two such techniques. Some of these techniques help abstraction of data layer from others quite well. For example Table adapter followers table data gateway design pattern described by Martin Flower.

Use of table data gateway

mranaw01 — Tue, 17 Jun 2008 07:22:06 +0000

When use table adapter pattern in a data set to connect to database most of the time there is no coding necessary.
use a asp:ObjectDataSource control to rfer to the table adapter object and then use that data source in the control
similar to following

aspx page

                                                    DataSourceID=”ObjectLUShift” DataTextField=”Shift” DataValueField=”ShiftNumber”
                            SelectedValue=’<%# Eval(“ShiftNumber”) %>’ >

                                                    OldValuesParameterFormatString=”original_{0}” SelectMethod=”GetShift”
                            TypeName=”LogTableAdapters.LUShiftTableAdapter”>

But if programmatically needs to access the table adapters sample code would be bit similar to following
All the connection info and query is with data access layer (data set and table adapters in it.)

aspx.cs page

FutureTrainingCoursesTableAdapter FutureTrainingCoursesAdapter = new FutureTrainingCoursesTableAdapter();
Training.FutureTrainingCoursesDataTable FutureTrainingCoursesTable = new Training.FutureTrainingCoursesDataTable();
FutureTrainingCoursesTable = FutureTrainingCoursesAdapter.GetCurrentTraining2();
foreach (Training.FutureTrainingCoursesRow Row in FutureTrainingCoursesTable)
        {
           Id = Convert.ToString(Row.ID);

Configuration settings for JNDI base Authenticate against a Ladp directory in Tomcat

mranaw01 — Tue, 17 Jun 2008 06:50:23 +0000

Configuration settings for JNDI base Authenticate against a Ladp directory in Tomcat
configuration settings
server.xml in conf directory
ldap://ldapserver:port” userBase=”OU= Contractors ,DC=Company,DC=com,DC=au” userSearch=”(sAMAccountName={0})” userRoleName=”member” roleBase=”OU= Contractors,DC=company,DC=com,DC=au” roleName=”CN” roleSearch=”member={0}” connectionName=”CN=TomcatUser,CN=Users,DC=company,DC=com,DC=au” connectionPassword=”xxx” roleSubtree=”true” userSubtree=”true” />

web.xml


        The role that is required to log in to the Midnight Readings Application

      contractor

FORM
Readings

/login.html
/error.html

Readings

Readings
/*

contractor

Exercise 2

mranaw01 — Tue, 17 Jun 2008 04:56:59 +0000

Service as a Delivery site which implements ITIL principles.
https://www.service-now.com/
Service-now.com is the pioneer of On Demand IT Service Management. Combining ITIL v3 guidelines with Web 2.0 technology, we offer Software as a Service that is thoroughly modern in its delivery, price, and value. Approachable and attractive, integrated and complete, designed for the Global 2,000. You’ve never seen IT management done like this before..

A direct debit service provider
http://www.ezypay.com.au/Default.aspx
Ezypay is an outsourced direct debit service provider dedicated to offering a payment collection system to assist businesses regulate their cash flow and revenue without the hassle of managing customers’ bills.

M-commerce site
http://www.mobillcash.com/
Mobillcash is an m-commerce billing platform that integrates with network operators around the world, making it possible for consumers to pay for online services and products with their mobile phone.
In much the same way that an e-commerce billing platform takes payment from a credit or debit card, Mobillcash m-commerce billing platform takes payment from a mobile phone.

An E-shop
http://shop.microsoft.com
Microsoft Online Store, an electronic commerce site on the Web that makes it easy for consumers to acquire Microsoft products either directly from Microsoft or from participating resellers

Bit like a e procurement site
https://tenders.nsw.gov.au/nsw/
Here you will find the most recent information about NSW business opportunities.
This website lists upcoming, current and closed business opportunities that have been provided by agencies. This site also provides details of awarded contracts over $150,000 in value.

Xml Workshop 3

mranaw01 — Sun, 15 Jun 2008 13:42:16 +0000

For step 1

Created the airportDTD.xml with internal DTD as per following code

]>

  Auckland
  Auckland International

   05/23
   3635
   …

  Sydney
  Kingsford-Smith

   16R/34L
   3962
   …


   16R/34R
   2438
   …


   07/25
   2539
   …

  Bangkok
  Don Muang International

   03L/21R
   3700
   …


   03R/21L
   3500
   …

For step 2
Extracted the dtd part form airportdtd.xml and created a separate airports.dtd file.
But got following syntax error in vs2008 editor
DOCTYPE gave a invalid mark-up declaration in VS2008 editor hence removed it. Then added following line as per instructions in xml workshop tutorial.

.
I guess since doctype is declared in xml file its not nsessary in the external dtd file.

airport.xml

   Auckland
   Auckland International

      05/23
      3635
      …

Sydney
Kingsford-Smith

  16R/34L
  3962
  …

  16R/34R
  2438
  …

  07/25
  2539
  …

   Bangkok
   Don Muang International

      03L/21R
      3700
      …


      03R/21L
      3500
      …

airports.dtd

Step 3
Created another button in the form and added following code(from msdn site) to parse the xml files with dtd.
Guess the main difference here is use of ValidationType.DTD and use of XmlReader class instaed of XmLTextREader.
Both airportDTD.xml and airport.xml gave the same result when parsed as expected.

private void button5_Click(object sender, EventArgs e)
        {
            //http://msdn.microsoft.com/en-us/library/z2adhb2f.aspx
            // Set the validation settings.
            XmlReaderSettings settings = new XmlReaderSettings();
            settings.ProhibitDtd = false;
            settings.ValidationType = ValidationType.DTD;
            settings.ValidationEventHandler += new ValidationEventHandler(ValidationCallBack);
            // Create the XmlReader object.
            XmlReader xtr = XmlReader.Create(@”C:\UNI\ITC565\XML_Workshop\XmlWorkShop\airportsDTD.xml”, settings);
            // Parse the file.
            while (xtr.Read())
            {
                if ((xtr.HasValue) & (xtr.NodeType == XmlNodeType.Text))
                { listBox1.Items.Add(xtr.Value); }
            };
        }

        // Display any validation errors.
        private void ValidationCallBack(object sender, ValidationEventArgs e)
        {
            listBox1.Items.Add(e.Message + “\n”);
        }

}