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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_amparam() accessor functionThe mi_tab_amparam() function retrieves any user-defined configuration values for the table.

The mi_tab_amparam() accessor function

The mi_tab_amparam() function retrieves any user-defined configuration values for the table.

Syntax

mi_string* mi_tab_amparam(MI_AM_TABLE_DESC *tableDesc);

tableDesc: Points to the table descriptor.

Usage

If the access method supports configuration keywords, the USING access-method clause of the CREATE TABLE statement can specify values for those keywords. A user or application can apply values to adjust the way in which the access method behaves.

Return values

The pointer accesses a string that contains user-specified keywords and values. A NULL-valued pointer indicates that the CREATE TABLE statement specified no configuration keywords.

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