Today we will introduce the XQuery language and cover a basic subset of this language, including constructor and FLWOR expressions. Both expressions will be useful in SQL/XML functions in DB2 for z/OS.
DB2 11.1 for LUW introduced built-in SQL functions for regular expressions, a long-awaited enhancement that effectively supersedes a couple of popular workarounds for regex processing in DB2 SQL. This article describes the REGEXP functions and explains what makes them better than older workarounds.
We are getting back on track how to access and manipulate XML documents in DB2 for z/OS. But this time, with focus on more complex XML data manipulation techniques than just selecting/inserting/updating, or deleting the whole XML document.
In Part 2, we will examine how to exploit Application Compatibility (APPLCOMPAT) which was introduced in DB2 11, and Function Levels which is introduced in DB2 12 to safely manage change. The levels of APPLCOMAT you can specify is limited by the Function Level of your system.
With the current interest in DevOps, a renewed focus on streamlining database change and integrating it with associated application change has been evident in recent times.In this paper we will look at one part of the overall topic of agile database development – the concept of database refactoring.
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