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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-Index Interface GuideThe Informix® Virtual-Index Interface Programmer's Guide explains how to create a secondary access method with the Virtual-Index Interface (VII) to extend the built-in indexing schemes of HCL Informix® typically with a DataBlade® module.
Descriptor function reference
Accessor functionsThe Virtual-Index Interface (VII) library contains functions that primarily access selected fields from the various descriptors.
The mi_tab_keydesc() accessor functionThe mi_tab_keydesc() function returns a pointer to the key descriptor.

The mi_tab_keydesc() accessor function

The mi_tab_keydesc() function returns a pointer to the key descriptor.

Syntax

MI_AM_KEY_DESC* mi_tab_keydesc(MI_AM_TABLE_DESC *tableDesc)

tableDesc: Points to the index descriptor.

Usage

The mi_tab_keydesc() function describes the individual key columns in an index entry. After the access method obtains the pointer, it can pass it to the accessor functions that extract information from the key descriptor.

Return values

The pointer enables the access method to locate the active key descriptor.

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