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Process XML using XQuery

Learn to more easily and naturally search your XML data with XQuery 1.0

Nicholas Chase (nicholas@nicholaschase.com), Author
Nicholas Chase has been involved in Web site development for companies such as Lucent Technologies, Sun Microsystems, Oracle, and the Tampa Bay Buccaneers. Nick has been a high school physics teacher, a low-level radioactive waste facility manager, an online science fiction magazine editor, a multimedia engineer, and an Oracle instructor. More recently, he was the Chief Technology Officer of Site Dynamics Interactive Communications in Clearwater, Florida, USA, and is the author of three books on Web development, including Java and XML From Scratch (Que) and the upcoming Primer Plus XML Programming (Sams). He loves to hear from readers and can be reached at nicholas@nicholaschase.com.

Summary:  For years developers have used SQL to retrieve data from structured sources such as relational databases. But what about unstructured and semi-structured sources, such as XML data? To be viable as a data source, XML needed a means to conveniently retrieve the data. XQuery provides this means, allowing developers to write a statement that both extracts data and (if necessary) structures the results as XML. This tutorial shows you how to use XQuery to retrieve information from an XML document stored in an XQuery-enabled database. It also explains the ways in which XPath changes with version 2.0, and what those changes mean for data management.

Date:  27 Mar 2007 (Published 24 Sep 2002)
Level:  Intermediate
PDF:  A4 and Letter (766 KB | 39 pages)Get Adobe® Reader®

Activity:  20134 views
Comments:  

Summary

XQuery is a more convenient way to access XML information than traditional XPath 1.0 expressions. It includes much greater type checking, data manipulation functions, and a fundamental change from node-sets to sequences. Perhaps the greatest change is the addition of programming-like capabilities that more closely mirror the types of tasks that will be necessary as XML makes further inroads into data storage.

These additions include FLWOR statements, which provide functionality similar to SQL statements, and the ability to create user-defined functions.

Other topics covered in this tutorial include:

  • Using DB2's XQuery implementation
  • FLWOR expressions and their various permutations
  • Changes to XPath with version 2.0
  • Sequences
  • Advanced programming capabilities built into XQuery

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TutorialTitle=Process XML using XQuery
publish-date=03272007
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