Here's an xdmp:value example...
---
xquery version "1.0-ml";
let $order := "$x descending"
return
xdmp:value(fn:concat("
for $x in ('a', 'b', 'c')
order by ", $order, "
return $x
"))
---
Cheers,
Eric
Tim Meagher wrote:
Hi Danny,
Hmm – I’m not sure how to use the xdmp:value() function in this case,
plus I’ve tried to dynamically construct the OrderByClause with one or 2
sort elements and an OrderSpec as well. Do you have any examples?
Thanks,
Tim
------------------------------------------------------------------------
*From:* [email protected]
[mailto:[email protected]] *On Behalf Of *Danny
Sokolsky
*Sent:* Friday, May 22, 2009 1:03 PM
*To:* General Mark Logic Developer Discussion
*Subject:* RE: [MarkLogic Dev General] Can an xquery order by clause
beconstructed?
Each “orderspec” is an expression, and the expression can be any XQuery
expression (for example an if/then/else):
http://www.w3.org/TR/xquery/#prod-xquery-OrderByClause
This will work for many things, but not if you want to manipulate more
than the expression. But you can get a long way with if/then/else.
If you want to do something more complex, then David’s xdmp:value
suggestion is a good one, where you construct a string that is your new
flwor expression and evaluate it with xdmp:value.
-Danny
*From:* [email protected]
[mailto:[email protected]] *On Behalf Of *David
Steiner
*Sent:* Friday, May 22, 2009 8:51 AM
*To:* General Mark Logic Developer Discussion
*Subject:* RE: [MarkLogic Dev General] Can an xquery order by clause be
constructed?
You could always construct the entire for clause as a string and pass it
to xdmp:value(…).
The MarkLogic folk probably have a better solution though.
*From:* [email protected]
[mailto:[email protected]] *On Behalf Of *Tim Meagher
*Sent:* Friday, May 22, 2009 8:16 AM
*To:* 'General Mark Logic Developer Discussion'
*Subject:* [MarkLogic Dev General] Can an xquery order by clause be
constructed?
Hi folks,
I would like to know if the order by clause can be programmatically
constructed. For example, given a query such as the following:
for $el in cts:search(xdmp:directory("/SomeDir/","infinity")/SomeNode,
cts:element-value-query(xs:QName("SomeElement"), "SomeElementValue",
("case-insensitive", "punctuation-insensitive", "diacritic-insensitive")))
let $id := string($e/@ID)
let $author := string($el/author[1])
let $title := string($el/title[1])
order by $id, $title, $author
return $el
I would like to be able to programmatically construct the order clause
to be something like "$author, $title" instead of "$id, $title, $author".
Thank you!
Tim – aaom consulting
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