w3schools
  
HOME HTML CSS XML JAVASCRIPT ASP PHP SQL MORE...   References Examples Forum About

XQuery FLWOR Expressions

« Previous Next Chapter »

The XML Example Document

We will use the "books.xml" document in the examples below (same XML file as in the previous chapter).

View the "books.xml" file in your browser.


How to Select Nodes From "books.xml" With FLWOR

Look at the following path expression:

doc("books.xml")/bookstore/book[price>30]/title

The expression above will select all the title elements under the book elements that are under the bookstore element that have a price element with a value that is higher than 30.

The following FLWOR expression will select exactly the same as the path expression above:

for $x in doc("books.xml")/bookstore/book
where $x/price>30
return $x/title

The result will be:

<title lang="en">XQuery Kick Start</title>
<title lang="en">Learning XML</title>

With FLWOR you can sort the result:

for $x in doc("books.xml")/bookstore/book
where $x/price>30
order by $x/title
return $x/title

FLWOR is an acronym for "For, Let, Where, Order by, Return".

The for clause selects all book elements under the bookstore element  into a variable called $x.

The where clause selects only book elements with a price element with a value greater than 30.

The order by clause defines the sort-order. Will be sort by the title element.

The return clause specifies what should be returned. Here it returns the title elements.

The result of the XQuery expression above will be:

<title lang="en">Learning XML</title>
<title lang="en">XQuery Kick Start</title>

« Previous Next Chapter »


DreamTemplate


W3Schools Certification

W3Schools' Online Certification Program

The perfect solution for professionals who need to balance work, family, and career building.

More than 4000 certificates already issued!

The HTML Certificate documents your knowledge of HTML, XHTML, and CSS.

The JavaScript Certificate documents your knowledge of JavaScript and HTML DOM.

The XML Certificate documents your knowledge of XML, XML DOM and XSLT.

The ASP Certificate documents your knowledge of ASP, SQL, and ADO.

The PHP Certificate documents your knowledge of PHP and SQL (MySQL).

WEB HOSTING
Best Web Hosting
PHP MySQL Hosting
Top 10 Web Hosting
UK Reseller Hosting
Web Hosting
FREE Web Hosting
Top Web Hosting
Windows Hosting
WEB BUILDING
XML Editor – Free Trial!
FREE Flash Website
FREE Web Templates
FLIGHT TICKETS
Find the cheapest flight
to any destination now!
EDUCATION
US Web Design Schools
HTML Certification
JavaScript Certification
XML Certification
PHP Certification
ASP Certification
STATISTICS
Browser Statistics
Browser OS
Browser Display