May 2018
Intermediate to advanced
680 pages
15h 54m
German
Content preview from XML -- Technologien, Grundlagen, Validierung, Auswertung
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WHERE
Eine bedingungsgesteuerte Auswahl kann mit der WHERE-Klausel durchgeführt werden.
Der folgende XQuery-Aufruf gibt die Vornamen aller Menschen aus, die in "Neustadt" wohnen. Dabei werden die Vornamen mit Start- und Ende-Tag ausgegeben.
<x>{
for $x in /Orte/Ort where $x/name = "Neustadt"
return $x/Mensch/vorname
}</x>
Der Aufruf $x/Mensch/vorname ergibt daher einen Node der Art <vorname>Hugo</vorname>, der Elementname wird also im Sinn eines Outer-XML mit ausgegeben. Wenn Sie nur den Textinhalt in eine selbst definierte Zielstruktur mappen möchten, bietet sich der folgende Ansatz an: <vn>{$m/vorname/text()}</vn>.
<erg>{ for $m in //Mensch[idOrt = 2] where $m/Gehalt < 400 return <m> <vn>{$m/vorname/text()}</vn> <nn>{$m/name/text()}</nn> ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.