Getting Startedwith pureQuery

15
Chapter 15 - pureQuery and pureXML
In this chapter we will describe how to integrate data stored using DB2 pureXML into
pureQuery applications.
15.1 pureQuery and pureXML: The big picture
Both pureXML and pureQuery are revolutionary technologies in the databases field.
pureXML introduced a native way to store, manage and query XML documents into DB2,
delivering a top quality hybrid database server.
pureQuery is revolutionizing the data access field, by providing improved performance,
optimization of existing applications, monitoring, manageability and advanced security
control for Java applications that access data stored in a database.
When it comes to integrate pureXML data into a pureQuery application, there are multiple
plug-in points and/or schemes that can be used. In this book we will focus on the following
three approaches:
• Give control to the SQL layer: with this approach, you use the SQL layer to
transform data between XML and relational formats, exposing the relational
representation to the application and leveraging pureQuery’s relational mapping
support.
• Give control to the data access API: with this approach, you can use one of the
multiple existing XML-Java mapping frameworks to map XML data into Java objects
and vice-versa.
• Give control to the application layer: with this approach, you implement your own
mapping logic/framework, tightly integrated into the business logic, providing
expanded versatility when data is shared by multiple applications
15.2 Give control to the SQL layer
In this approach, the facilities in the SQL layer are used to map the data from XML into
relational format and vice-versa. In the examples we will show, SQL/XML will be used to