DB2 pureXML Cookbook: Master the Power of the IBM Hybrid by Matthias Nicola

By Matthias Nicola

DB2 pureXML Cookbook

Master the facility of the IBM Hybrid facts Server

 

Hands-On ideas and most sensible Practices for constructing and dealing with XML Database purposes with DB2

 

More and extra database builders and DBAs are being requested to advance functions and deal with databases that contain XML facts. Many are using the hugely praised DB2 pureXML expertise from IBM. within the DB2 pureXML Cookbook, best specialists from IBM supply the sensible options and confirmed code samples that database pros have to construct larger XML suggestions swifter. prepared via job, this ebook is choked with greater than seven-hundred easy-to-adapt “recipe-style” examples protecting the total software lifecycle–from making plans and layout via coding, optimization, and troubleshooting. This notable library of recipes contains greater than 250 XQuery and SQL/XML queries. With the authors’ hands-on assistance, you’ll the best way to mix pureXML “ingredients” to successfully practice nearly any XML info administration activity, from the best to the main advanced.

 

Coverage includes

 

  • pureXML in DB2 nine for z/OS and DB2 9.1, 9.5, and 9.7 for Linux, UNIX, and Windows
  • Best practices for designing XML information, functions, and garage items uploading, exporting, loading, replicating, and federating XML data
  • Querying XML information, from begin to end: XPath and XQuery facts version and languages, SQL/XML, kept systems, UDFs, and lots more and plenty more
  • Avoiding universal mistakes and inefficient XML queries
  • Converting relational information to XML and vice versa
  • Updating and remodeling XML documents
  • Defining and dealing with XML indexes
  • Monitoring and optimizing the functionality of XML queries and different operations
  • Using XML Schemas to constrain and validate XML documents
  • XML software development–including code samples for Java, .NET, C, COBOL,PL/1, personal home page, and Perl

 

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Additional resources for DB2 pureXML Cookbook: Master the Power of the IBM Hybrid Data Server

Sample text

This chapter explains how to read relational data from existing database tables and construct XML documents from it. Chapter 11, Converting XML to Relational Data, describes the opposite of Chapter 10, that is, the process of decomposing or shredding XML documents into relational tables. Two shredding methods are discussed, one using the XMLTABLE function and the other using annotated XML Schemas. Chapter 12, Updating and Transforming XML Documents, covers three techniques for updating XML documents: Full document replacement, XSLT transformations, and the XQuery Update Facility that allows you to modify, insert, delete, or rename individual elements and attributes within an XML document.

This is not the case in our example. Since our fictitious application typically reads and writes one order at a time, storing many orders in a single large document would result in suboptimal performance. In general, combining many independent business objects in a single document is not recommended. DB2 uses indexes over XML data to filter on a per-document level. Therefore, the finer the XML document granularity, the higher the potential benefit from indexbased access. Although DB2 pureXML helps you avoid a lot of XML parsing in the application layer, some applications might still use a DOM parser to ingest XML documents and run into performance problems or failures if the documents are too large.

Xxx DB2 ® pureXML® Cookbook: Master the Power of the IBM® Hybrid Data Server Chapter 7, Querying XML Data with SQL/XML, explains how XPath can be included in SQL statements with the SQL/XML functions XMLQUERY and XMLTABLE and the XMLEXISTS predicate. The use of SQL/XML is illustrated through a rich collection of examples and a discussion of common mistakes and how to avoid them. Chapter 8, Querying XML Data with XQuery, introduces the XQuery language, which is a superset of XPath. Among other things, this chapter describes XQuery FLWOR expressions, combinations of SQL and XQuery, and a comparison of XPath, XQuery, and SQL/XML.

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