Grabbing XML data from ASP
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By now, most of our readers are familiar, at least in principle, with XML - the w3c's platform neutral data markup language. However not everyone knows how to use XML with ASP. In this article, I'll run you through using ASP and JScript to open and read XML files. in the next article, I'll show you how to create and modify XML with ASP.
The example I'm going to show you is in use on my office intranet, for the purposes of identifying who is logged in. since all the machines in the office have a static, unique IP, I've used Request.ServerVariables("remote_host") to identify the machine, and XML to map machine to user. It's a little courtesy app, and also allows me to restrict administrative functions to only five machines in the entire office.
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XML stands for Extensible Markup Language. XML can be used in many ways and one of which is 'data storage'. This is the one we will be exploring in this article. XML along with XSL ( Extensible Stylesheet Language ) can by used to present data on the web pages. XML provides the data and XSL allows us to present it the way we want. Remember though that not all browsers support XML on the client side, only Micrsoft Internet Explorer 5.0 and above support XML. XML can also be used to perform RPC ( Remote Procedure Call ). Actually this capability of XML to allow communication between distant applications is so strong that Microsoft has developed SOAP ( Simple Object Access Protocol ) specification which uses XML to allow communication between remote applications. XML can be used for a lot more purposes which I haven't mentioned here. Also keep in mind that Microsoft's future .NET platform will make use of XML even more than any tool does today. ASP+, ADO+ and others will use XML to define and present data. So if you are comfortable with XML today, it will help you in the near future when you will be getting yourself ready to develop applications in the revolutionary platform called Microsoft .NET.
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Did you know that the ADO Recordset contains a Save method that can save the contents of a Recordset to an XML file? In fact, in an upcoming article on 4Guys this method will be discussed. One disadvantage of using this approach, though, is that the XML produced by the Recordset is anything but readable. Plus, there is a ton of information there, describing gobs of data for each column in the Recordset (its data type, precision, NULLability, maxlength, etc.). Additionally, when saving a Recordset to XML, the XML node names are archaic: each row's node name is z:row; the parent node is named rs:data.
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