[xquery-talk] Looping in Xquery

[James Fuller]

if you mean curly braces, they are just a way of when to engage xquery
processing

here is a simple example, if your entire query was

<test>1 + 1</test>

then when you process this it would emit exactly the same thing e.g.

<test>1 + 1</test>

but if you did

<test>{1 + 1}</test>

then the stuff in the braces would get evaluated by xquery processor
e.g. the output would look like

<test>2</test>

keep on asking questions ...

Jim Fuller

On Tue, Sep 4, 2012 at 11:51 AM, Mailing Lists Mail <daktapaal at gmail.com> wrote:
> Thanks a lot folks...
> I still dont clearly understand the fundamentals of braces in this
> language..
> May be i should start biting the books / WHich I will.. I am hoping to be
> contributing to this list in like 4-5 months.
> Thanks again.. Your solution works..
> Vasu
>
>
> On Tue, Sep 4, 2012 at 10:44 AM, Peter Stadler
> <stadler at weber-gesamtausgabe.de> wrote:
>>
>> An alternative would be to use string-join(). First join all the strings
>> and then calculate the length:
>> {string-length(string-join($ltnfiles//subtopic[@id =
>> 'DEF']/short-definition/p/text), '')}
>>
>> All the best
>> Peter
>>
>> PS: A great resource for xquery functions is
>> http://www.xqueryfunctions.com/
>> You will find lots of stuff there ...
>>
>> Am 04.09.2012 um 11:37 schrieb John Snelson:
>>
>> > You're close - the missing part is that you want to use the sum()
>> > function, ie:
>> >
>> > <short-desc>{
>> >  sum(
>> >    for $shrtdesc in $ltnfiles//subtopic[@id = 'DEF']//short-definition
>> >    return string-length($shrtdesc/p/text)
>> >  )
>> > }</short-desc>
>> >
>> > John
>> >
>> > On 04/09/12 10:15, Mailing Lists Mail wrote:
>> >> Dear Xquery Adults,
>> >>
>> >> I am very new here.. I have some issues with getting my requirements
>> >> working.. I guess, this should be very simple, but dont seem to get my
>> >> heads around... THe following is what I want..
>> >>
>> >> I have loads of XMLs in the Data Store ( markLogic)
>> >>
>> >> I have to run a query to do the return the string lengths of certain
>> >> elements from 100 XMLs./
>> >>
>> >> So my pseudo code will be :
>> >>
>> >> <results>
>> >> For all XMLs in the Data store
>> >> {
>> >>
>> >>    <file filename = "filename of the current file ">
>> >>
>> >>           <desc> {length of desc at //xx/y/desc }
>> >>     <!--
>> >>    There could be more than one desc, in which case, i would like the
>> >> sum of all the string lengths of each desc
>> >> -->
>> >>  </desc>
>> >>
>> >> <short-desc>
>> >> {
>> >>    string-length ( //xx//yy/short-desc)
>> >> }
>> >>
>> >> </short-desc>
>> >>
>> >>   </file>
>> >>
>> >> </results>
>> >>
>> >>
>> >> My attempts:
>> >>
>> >>
>> >>  declare namespace dict = "http://www.lexis-nexis.com/glp/dict";
>> >> for $ltnfiles in doc()
>> >>   let $NAME:= document-uri($ltnfiles)
>> >> return (
>> >>  <ltn  >
>> >>   <name>
>> >>    {$NAME}
>> >>   </name>
>> >>    <short-desc>
>> >>    {string-length(string($ltnfiles//subtopic[@id =
>> >> 'DEF']/short-definition/p/text))}
>> >>    </short-desc>
>> >>  </ltn>
>> >> )
>> >> THe above works fine, if there is only one short-definition.. FOr more
>> >> than one shortdefiitions, it comes up with the error message obviously
>> >> because the string does not allow 2 arguments, while the stuff passed
>> >> into the function is a sequence...
>> >>
>> >> How do I do another loop inside the first one, for each short-defiitin
>> >> ... SOmething like :
>> >>
>> >> for $ltnfiles in doc()
>> >>   let $NAME:= document-uri($ltnfiles)
>> >> return (
>> >>  <ltn  >
>> >>   <name>
>> >>    {$NAME}
>> >>   </name>
>> >>    {
>> >>    for $shrtdesc in $ltnfiles//subtopic[@id = 'DEF']//short-definition
>> >>    <short-desc>
>> >>    {
>> >>    string-length( $shrtdesc/p/text)
>> >>    }
>> >>    </short-desc>
>> >>     }
>> >>  </ltn>
>> >> )
>> >>  DOEstNT WORK .. :( This wont give me what I want as What I want is a
>> >> sum (string-lengths of all the short-def) .. But atleast i thought i
>> >> would get something like
>> >>
>> >> <short-desc>100</short-desc>
>> >> <short-desc>344</short-desc>
>> >>
>> >> ( I would have liked <short-desc>444</short-desc> )
>> >>
>> >> ANy help would be highly appreciated ..
>> >>
>> >> Thanks
>> >>
>> >> Dak.
>> >>
>> >>
>> >
>> >
>> > --
>> > John Snelson, Lead Engineer                    http://twitter.com/jpcs
>> > MarkLogic Corporation                         http://www.marklogic.com
>> > _______________________________________________
>> > talk at x-query.com
>> > http://x-query.com/mailman/listinfo/talk
>>
>> --
>> Peter Stadler
>> Carl-Maria-von-Weber-Gesamtausgabe
>> Arbeitsstelle Detmold
>> Gartenstr. 20
>> D-32756 Detmold
>> Tel. +49 5231 975-665
>> Fax: +49 5231 975-668
>> stadler at weber-gesamtausgabe.de
>> www.weber-gesamtausgabe.de
>>
>>
>>
>>
>>
>
>
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