| Richiamo del XML usando asp
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La F o la maggior parte delle organizzazioni basate nette, i dati memorizzati nelle loro basi di dati � la loro sola propriet�. Come questi dati possono essere organizzati pi� efficacemente ed efficientemente usando XML, � il tema di questo articolo.
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Quando generate una base di dati in MS accesso, anche se � vuota, prende lo spazio molto appena per la struttura. Destra? Perch� spreco questo molto spazio appena per la struttura quando potete memorizzare le informazioni circa almeno cento membri del vostro luogo nello stesso spazio. Quando memorizzate i dati come XML, � immagazzinato sotto forma d'una lima di testo semplice con l'estensione .XML, con alcune modifiche. Per il momento, non andr� nella teoria dettagliata di spiegazione delle complessit� di XML, ma piuttosto mi concentro su come accederle e maneggiare che usando l'asp.
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Prima che cominciamo, che cosa tutto � richiesto per il vostro web server potere servire XML. Per il lato XML dell'assistente che procede, lo IE 5.0+ deve essere installato sull'assistente. Ci� � perch� abbiamo bisogno di XML DOM (modello dell'oggetto del documento di XML), che � basicamente un analizzatore di XML, che � fornita come componente di IE5.
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Ora siamo aspettiamo per scrivere i nostri scritti. Abbiamo bisogno di due cose.
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Now we are ready to write our scripts. We need two things.
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- Data Source
- ASP Script to manipulate the data.
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Let us first create a data source.
Suppose we want to maintain a resource repository in which we want to include a brief description
of the resource, its link on the web and its link text. The Sample XML data source for this can be:
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(Contents of File Resource.XML)
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<?xml
version="1.0" ?>
<Resource_Repository>
<Resource>
<text>
This program
allows you to encrypt your HTML Source Codes
so that no one can steal and Copy Paste them in their own site.
</text>
<link>
<url>
ftp://ftp.cedium.net/internet/htmlcrypt/encryptHTML.exe
</url>
<linetext>
HTML Source Code Encryption
</linetext>
</link>
<Size>
736 KB
</Size>
</Resource>
<Resource>
<text>
DOS Based
Eliza Program. Eliza is a Computer program that can talk to you
like a human being. Makes use of Artificial Intelligence.
</text>
<link>
<url>
http://hps.elte.hu/~gk/Eliza/ELIZA.EXE
</url>
<linetext>
Eliza Chatterbot
</linetext>
</link>
<Size>
36 KB
</Size>
</Resource>
</Resource_Repository>
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Now we write a script to access this data and display it on the web page.
I result will be generated in a very simple format, to make the ASP Code simple to understand.
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To begin with, we need to create an XML DOM object on the server.
This can be done with a line as simple as :
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<% Set objXML =
Server.CreateObject("Microsoft.XMLDOM") %>
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Now we need to give the path of our data source.
So add the following line to the code:
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<%
objXML.Load (Server.MapPath("Resource.xml"))
If objXML.parseError.errorCode <> 0 Then
Response.Write "<p><font color=red>Error loading the Resource
file.</font></p>"
Response.End
End If
%>
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If the XML DOM Parser throws any error, then we catch that and display the error message.
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We want to display the list of all the resources in the file Resource.xml.
We know that the resources are enclosed within <Resource> tag.
So, the next step is to create a list of all the objects
under the tag <Resource>.
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<%
Set objLst = objXML.getElementsByTagName("Resource")
%>
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The Length property of object list indicates the number of items in the list.
For example, in our example of Resource.xml, there are two records under the <Resource> tag.
So, objLst.Length shows the value 2, when displayed.
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<%
Response.write "There are " & objLst.Length & " resources
on this site."
%>
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This is quite interesting upto now. What about accessing individual sub-items ? Suppose we just want
to display the URLs of all the resources in our 'database', how can we do that ?
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Create one more object, now referring to the items inside the object list. The
sub-items can be accessed by using childNodes(index). See this code for further understanding :
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<%
' for each resource in the list
For i = 0 To objLst.Length - 1
Set subLst = objLst.item(i)
Response.write "<P>" & vbcrlf
Response.Write "<a href='" &
subLst.childNodes(1).childNodes(0).Text & "'>" _
& subLst.childNodes(1).childNodes(0).Text & "</a>"
Next
%>
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A careful look at the structure of the XML document that we had created earlier reveals that <URL>
is inside <Link> which is second element of the <Resource> (first being <text>).
If we start our indexing from 0 (Zero), then <Link> is the first element of <Resource> and
<URL> is the Zeroeth element inside <Link>. That's why I have written the line:
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subLst.childNodes(1).childNodes(0).Text
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which is nothing but <URL>. Re-read the previous paragraph
if you are still not clear and I am sure you will get it soon.
So, the final source code of the ASP file we have
created for displaying the URL of all the resources in our database is:
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<%
' creating an object of XMLDOM
Set objXML = Server.CreateObject("Microsoft.XMLDOM")
' Locating our XML database
objXML.Load (Server.MapPath("Resource.xml"))
' checking for error
If objXML.parseError.errorCode <> 0 Then
Response.Write "<p><font color=red>Error loading the Resource
file.</font></p>"
Response.End
End If
' referring to Resource
Set objLst = objXML.getElementsByTagName("Resource")
Response.write "There are " & objLst.Length & " resources
on this site ."
' for each resource
For i = 0 To objLst.Length - 1
' refer to sub-item
Set subLst = objLst.item(i)
'display the URL
Response.Write "<a href='" &
subLst.childNodes(1).childNodes(0).Text & "'>" _
& subLst.childNodes(1).childNodes(0).Text & "</a>"
Next
%>
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Of course, you would need to add all those formatting HTML tags to make this list more attractive.
But the core remains the same.
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Conclusion:
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In this article, we learned how to retrieve the 'records' from XML 'database'.
For complete Database related operations, we must know how to insert,
update and delete the records from the Scripts.
In the next article, we will see how to perform these operations as well.
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