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Extending Informix®Beyond standard relational database objects, HCL Informix® can be extended to handle specialized data types, access methods, routines, and other objects. Informix® includes many built-in extensions that are fully integrated in the database server. Informix® also provides DataBlade® modules, which are packages of extended database objects for a particular purpose and that are installed separately from the database server. Alternatively, you can create your own user-defined objects for Informix®.
Creating extensionsYou can create user-defined data types, routines, access methods, and other database objects to suit your needs. You can use application programming interfaces to write user-defined routines and applications that access data in Informix® databases.
Virtual-Table Interface GuideThe Informix® Virtual-Table Interface Programmer's Guide explains how to create a primary access method with the Virtual-Table Interface (VTI) so that users have a single SQL interface to HCL Informix® tables and to data that does not conform to the storage scheme of HCL Informix®.
Develop an access methodThese topics describe the steps that you take to implement a user-defined access method with the Virtual-Table Interface (VTI).

Develop an access method

These topics describe the steps that you take to implement a user-defined access method with the Virtual-Table Interface (VTI).

The following steps are a high-level summary of the steps that you take to provide an access method.

Choose the optional features that the access method supports.
Program and compile the C header files and purpose functions as well as the modules that the purpose functions call.
Execute the CREATE FUNCTION statement to register each purpose function in the sysprocedures system catalog table.
Execute the CREATE PRIMARY ACCESS_METHOD statement to register the user-defined access method in the sysams system catalog table.
Test the access method in an end-user environment.

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