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XQuery Beispiel

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Lassen Sie uns versuchen, etwas grundlegende XQuery Syntax indem das Betrachten eines Beispiels zu erlernen, das beow gegeben wird.

Das XML Beispiel-Dokument

Wir benutzen das folgende XML Dokument im Beispiel unten.

�bookdetails.xml�:

<?xml version="1.0" encoding="ISO-8859-1"?>
<bookstore>
<book category="COOKING">
<title lang="en">Everyday Italian</title>
<author>Giada De Laurentiis</author>
<year>2005</year>
<price>30.00</price>
</book>
<book category="CHILDREN">
<title lang="en">Harry Potter</title>
<author>J K. Rowling</author>
<year>2005</year>
<price>29.99</price>
</book>
<book category="WEB">
<title lang="en">XQuery Kick Start</title>
<author>James McGovern</author>
<author>Per Bothner</author>
<author>Kurt Cagle</author>
<author>James Linn</author>
<author>Vaidyanathan Nagarajan</author>
<year>2003</year>
<price>49.99</price>
</book>
<book category="WEB">
<title lang="en">Learning XML</title>
<author>Erik T. Ray</author>
<year>2003</year>
<price>39.95</price>
</book>
</bookstore>

Wie man Nullpunkte von �bookdetails.xml� vorw�hlt?

Funktionen

XQuery verwendet Funktionen, um die Daten von den XML Dokumenten zu extrahieren.

Die Doc. () Funktion wird im Allgemeinen verwendet, um die �bookdetails.xml� Akte zu �ffnen:

doc("bookdetails.xml")

Weg-Ausdr�cke

XQuery verwendet Wegausdr�cke, um durch Elemente im XML Dokument zu steuern.

Der folgende Wegausdruck wird verwendet, um alles Titelelement in der �bookdetails.xml� Akte vorzuw�hlen:

doc("bookdetails.xml")/bookstore/book/title

(/bookstore w�hlt das Buchhandlungelement vor, w�hlt /book alle Buchelemente unter dem Buchhandlungelement vor, und /title w�hlt alles Titelelement unter jedem Buchelement) vor

Das XQuery oben extrahiert das folgende Resultat:

<title lang="en">Everyday Italian</title>
<title lang="en">Harry Potter</title>
<title lang="en">XQuery Kick Start</title>
<title lang="en">Learning XML</title>

Pr�dikate

XQuery verwendet Pr�dikate, um die extrahierten Daten von den XML Dokumenten zu begrenzen.

Das folgende Pr�dikat wird hinsichtlich auserw�hlten alle Buchelemente unter dem Buchhandlungelement verwendet, die ein Preiselement mit einem Wert haben, der kleiner als 30 ist:

doc("bookdetails.xml")/bookstore/book[price<30]

The XQuery above will extract the following result:

<book category="CHILDREN">
<title lang="en">Harry Potter</title>
<author>J K. Rowling</author>
<year>2005</year>
<price>29.99</price>
</book>

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Keywords: xquery editor, xml databases, xml schema, xquery expression

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