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Using Microsoft Index Server from Delphi (Views: 100)


Problem/Question/Abstract:

Many people has asked how to search inside an index server from Microsoft in order to show the results like a normal dataset. Here's how this can be done and some considerations on the use & misuse of this technology

Answer:

What is Index Server

Index Server is the web-based solution choosen by Microsoft to give its IIS server the ability to search and retrieve documents; as it is concieved for use with ASP pages, it is strongly based on COM technology and in its latest release has been fully integrated also with the ADO technology.

First Steps

I will demonstrate how to leverage on ADO in order to search the directories of the default catalog of the main website; to search another catalog you will just change an option.
First of all you should get the Microsoft primer on Index Server at:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnindex/html/msdn_is-intro.asp

With this link you wil lfind the explanation necessary to use the index server; using it is anyway easy.
To start it just go inside the Microsoft Management Console (MMC) and open inside it the services; the Microsoft Index Server Service is listed here, just right click to view the contextual menu and choose from it the "Start" option; if you want you can have it start automatically on every boot, just choose the properties of the listed item and choose "Auto Start" from the combo box.
You can have more than 1 catalog to search within; top add new catalogues you should open the MMC for IIS and work from it, but remember that this works only with Nt4/W2K server, not workstation, as in Nt4/W2K wkst only 1 web site is allowed.
BTW: The default catalog is named "WEB".

ADO integration

Let's get our feet wet... We will build a form with a text field and a db grid in which you will see the results of your search, just like using a normal database like access or sql server
First of all open a brand new Delphi Project; add a ADQuery & ADOConncetion couple on the form, together with a Datasource and a DBGrid. You will also need a button and a Edit component.
After these veru first steps, double click on the connectionstring property of the ADOCOnnection1 component; it will open the standard box; from the list of OLEDB Providers you should find (if your ADO is up to date) choose:
"Microsoft OleDb Provider for Indexing Services"; with a double click you will have access to the advanced options, which are already setted correctly; if you want to change the catalogue, just modify the text in the "data source" field. Click on "Test connection", everything should work.

Connect together as usual the components:

Adoquery1 -> Adoconnection1
Datasource1 -> Adoquery1
DBGRID1 -> Datasource1

I suggest of course to keep Adoconnection1.loginprompt := False and to open the connection asap (I made this at design time).

and then double click on th Button you already placed on the form in the first step; the event handler is as follows, just copy and paste:

var
  tmp: string;
begin
  if ADOQuery2.active then
    ADOQuery2.close;
  tmp := 'Select DocTitle, path, rank, size, Vpath, write FROM scope() WHERE
         CONTAINS(''' + edit1.text + ''') > 0 ORDER by FileName';
  ADOQuery2.sql.text := tmp;
  ADOQuery2.Open;
end;

now you have finished: just run the application and type "note" inside the text field, it should show you 3/4 records inside the dbgrid, with the records showing the file names, path etc etc.

Pros & Cons

PROS

You can integrate searched made on Index server and other data repositories like Access files... this can be very useful for sites based upon dynamic page creation technology.
Zero administration
Perfect for ASP objects made in Delphi and for CGIs

CONS

First of all there is a bug in the ADOQuery implementation by Borland, changing the SQL property of the ADOQUERY may result in error messages at design time; it is a confirmed bug, anyway everything works perfectly on runtime. So don't worry for this; maybe a patch will be given to Delphi user, otherwise you can try other ways (Using native ADO as COM objects resolve the problem)
Second: Index Server is tigtly integrated with IIS so you can search only web catalogues, not particular directories of you file system.


Component Download: http://www.dreamscapeitalia.com/download/delphi_index_server.zip

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