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Postnext
Rick ScofieldSubject: XQuery Nested Loop Lookup
Author: Rick Scofield
Date: 09 Feb 2014 10:27 AM
Need some help with a Xquery nested loop. Both files are about 30k lines long and growing. I'm trying to match the <Sku> value in the $mivabod file with the <upc> value in the $carhbod file and return the <sku> or <upc> and the <qtyavail> from the $carhbod file. I have the xquery code here that takes about 30min to complete.

something like...
SELECT $carhbod/qtyavail FROM $carhbod WHERE $mivabod/Sku = $carbod/upc
Can anyone help with a more efficient way to do this?
This xQuery takes way too long...

===begin code===
declare variable $mivabod as document-node(element(*, xs:untyped)) external;
declare variable $carbod as document-node(element(*, xs:untyped)) external;

<root>
{
for $miva in $mivabod/table/row/Sku
for $carh in $carbod/root/row[upc = $miva]
return
<carqty>
<UPC>{$miva/text()}</UPC>
<quantity>{$carh/qtyavail/text()}</quantity>
</carqty>
}
</root>
===end code===

Postnext
Ivan PedruzziSubject: XQuery Nested Loop Lookup
Author: Ivan Pedruzzi
Date: 09 Feb 2014 11:59 AM
Hi Rick,

Variable $A and $B mimic your input documents, the loop outputs the elements with the same id.

Does it help?

Ivan Pedruzzi
Stylus Studio Team



declare variable $A :=
<A>
<A id="0">A0</A>
<A id="1">A1</A>
</A>;

declare variable $B :=
<B>
<B id="0">B0</B>
<B id="2">B2</B>
</B>;

<root>{
for $a in $A/A,
$b in $B/B
where $a/@id = $b/@id
return <match A="{$a}" B="{$b}"/>
}</root>

=========================
<root>
<match A="A0" B="B0"/>
</root>

Postnext
Rick ScofieldSubject: XQuery Nested Loop Lookup
Author: Rick Scofield
Date: 09 Feb 2014 01:20 PM
Originally Posted: 09 Feb 2014 12:20 PM
Thanks Ivan, I believe I've tried your suggestion already. Is the following code doing the same as your suggestion?

I can see the difference, do id attributes match faster that elements?

declare variable $mivabod as document-node(element(*, xs:untyped)) external;
declare variable $carbod as document-node(element(*, xs:untyped)) external;

<root>
{
for $miva in $mivabod/table/row
for $carh in $carbod/root/row
where $miva/Sku/text() = $carh/upc/text()
return ...
...


Postnext
Ivan PedruzziSubject: XQuery Nested Loop Lookup
Author: Ivan Pedruzzi
Date: 10 Feb 2014 09:18 AM

If you cannot make it work, the only option is to send us samples of the two input documents at stylussupport@ivitechnologies.com

Ivan Pedruzzi
Stylus Studio Team

Posttop
Rick ScofieldSubject: XQuery Nested Loop Lookup
Author: Rick Scofield
Date: 10 Feb 2014 03:11 PM
Thanks Ivan,
I have emailed the project files.

Thanks again, Rick

   
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