Informix Virtual Table Interface Tutorial

New at DeveloperWorks: Write extensions to access external data sources and applications.

IBM Informix provides access to external data sources through the virtual table interface (VTI). The VTI provides a set of hooks called purpose functions. As a developer, your task is to create an access method that implements VTI purpose functions and as many additional user-defined routines (UDRs) as necessary to access your external data source. This tutorial shows you how to compile and run your VTI UDR as a shared library.

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17 March 2011