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Grouping By Time / Round xs:time to just the hour?

Andrew Serff lists at serff.net
Fri Jul 9 15:35:14 PDT 2010


  Grouping By Time / Round xs:time to just the hour?
Awesome.  Thanks everyone!  Michael, I also really like the shorthand
example.  Very cool stuff.  Here is what I ended up with.

<metrics>
{
 let $m :=
collection('c:/dev/andrew.serff/Libraries/saxon/metricsCollection.xml')//metrics/metric[action
= 'QUERY']
 for $date in distinct-values(for $dt in (for $ts in $m/timestamp return
xs:dateTime($ts))
 let $hour := hours-from-dateTime($dt)
 return xs:time(concat(concat('0'[$hour<10], $hour), ":00:00")))
 let $hour := hours-from-time($date)
 let $metrics_today := $m[xs:time(xs:dateTime(timestamp)) > $date and
xs:time(xs:dateTime(timestamp)) < xs:time(concat(concat('0'[$hour<10],
$hour), ":59:59"))]
 return <res><d>{$date}</d><metrics>{count($metrics_today)}</metrics></res>
}
</metrics>

Thanks again!
Andrew

On Thu, Jul 8, 2010 at 1:23 PM, Michael Kay <http://x-query.com/mailman/listinfo/talk> wrote:

>
>  1)  The only way i can think of is
>>
>> if ($hour<  10) then concat('0', $hour) else $hour
>>
>>
> In XQuery 1.1 there's format-number($hour, '00'), but in the meantime
> there's
>
> substring(string(hour + 100), 2)
>
> or
>
> concat('0'[$hour<10], $hour)
>
> which have the advantage over the above of always producing a string, as
> well as being shorter.
>
> Michael Kay
> Saxonica
>
> _______________________________________________
> http://x-query.com/mailman/listinfo/talk
> http://x-query.com/mailman/listinfo/talk
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