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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®.
Descriptor function referenceThese topics provide the syntax and usage for the functions that the HCL Informix® database server supplies to access-method developers.
Accessor functionsThe Virtual-Table Interface (VTI) library contains functions that primarily access selected fields from the various descriptors.
The mi_tab_id() accessor functionThe mi_tab_id() function retrieves the table identifier from the table descriptor.

The mi_tab_id() accessor function

The mi_tab_id() function retrieves the table identifier from the table descriptor.

Syntax

mi_integer mi_tab_id(MI_AM_TABLE_DESC *tableDesc)

tableDesc: Points to the table descriptor.

Usage

The access method can call the mi_tab_id() function to determine the unique identifier that the systables system catalog table associates with the virtual table.

Return values

The return value identifies the table to the database server in the tabid column of the systables or sysfragments system catalog table.

The table identifier is identical for each fragment in the table.

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