[xquery-talk] problem with loops
Titash Neogi
titash_neogi at symantec.com
Wed Jan 4 03:46:45 PST 2006
Thanks a Lot!!
This worked like a breeze. :)
Thanks again.
Titash
-----Original Message-----
From: John Snelson [mailto:jsnelson at sleepycat.com]
Sent: Wednesday, January 04, 2006 4:59 PM
To: Titash Neogi
Cc: talk at xquery.com
Subject: Re: [xquery-talk] problem with loops
In that case, you'll want to do something like this:
declare function local:depends($map as node(), $name as xs:string) as
xs:string*
{
let $entry := $map/maps/map[res = $name]
let $depend := string($entry/pre)
return if(exists($entry)) then ($name, local:depends($map, $depend))
else $name
};
local:depends(doc("file.xml"), "DATA4")
Which should do want you want.
John
Titash Neogi wrote:
> Thanks for the replies.
>
> Here is a simplified outline of what I am trying to do
>
>
> I have a xml file as shown below
>
> <maps>
> <map>
> <pre> DATA0 </pre> <res> DATA1 </res> </map>
> <map>
> <pre> DATA1 </pre> <res> DATA2 </res> </map>
> <map>
> <pre> DATA2 </pre> <res> DATA3 </res> </map>
> <map>
> <pre> DATA3 </pre> <res> DATA4 </res> </map>
> .
> .
> .
>
> </maps>
>
> Now the idea is that if I search for DATA4, the system will trace its
> path backwards and find out all the linked dependencies. So the output
> would something like
>
> Query - DATA4
>
> Result - DATA4 DATA3 DATA2 DATA1 DATA0
>
>
> The algorithm I am trying to implement is
>
> 1. Obtain input from user
>
> 2. repeat steps 3 through 5 for the entire file
>
> 3. send user input to function A that identifies the <map> </map>
chunk
> corresponding to this input
>
> 4. send the output of function A (step 3) to a function B that
extracts
> the pre/text() bit of this chunk
>
> 5. send the output of function B (step 4) to function A (step 3 again)
> to identify the <map> </map> chunk
>
>
> Now, to repeat, my problem is that my function overwrites the values
in
> the loop so that I only get the last variable's output.
>
> Hope this makes the logic a little clearer.
>
> Any further help on this would be really nice.
>
> Thanks
> Titash
--
John Snelson, Berkeley DB XML Engineer
Sleepycat Software, Inc
http://www.sleepycat.com
Contracted to Sleepycat through Parthenon Computing Ltd
http://blog.parthcomp.com/dbxml
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