Hi Paul, you've run into the basic building block of XQuery --by
default, lazy evaluation will defer the save operation if it can. (I
don't think it's a transaction issue as others have suggested, although
that also comes into play)
A couple of things you can try to force evaluation:
1. refer to $save in another let, after the first one. This will force
the interpreter to evaluate $save. Something like let $save :=
saveFunction() return if ($save) then ... else ...
2. wrap saveFunction() in xdmp:eager(). This is a (not normally
recommended) way to force evaluation of an expression.
3. Probably the preferred way to address this though would be to put it
into two expressions
(
let $a := ...
let $b := ...
return saveFunction($x),
if (wasSaved())
then anotherFunction()
else ()
)
Charles
On 04/16/2013 11:57 AM, Chad Bishop wrote:
Greetings,
I have the following situation:
let $var ...
for ...
where ...
return
let $a ...
let $b ...
let $save := saveFunction($param)
return ($a, anotherFunction($b)...)
That saveFunction is inserting a document...or supposed to.
What I've found is it doesn't actually insert the document unless I:
return $save
Why is that? It matters in this situation because anotherFunction() depends on
the document existing.
Thank you for any help,
-Chad
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Charles Greer
Senior Engineer
MarkLogic Corporation
[email protected]
Phone: +1 707 408 3277
www.marklogic.com
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