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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_qual_param_expression() accessor functionThe mi_qual_param_expression() function returns the qualifier descriptor for the parameter, which is an expression.

The mi_qual_param_expression() accessor function

The mi_qual_param_expression() function returns the qualifier descriptor for the parameter, which is an expression.

Syntax

MI_AM_QUAL_DESC* mi_qual_param_expression(MI_AM_PARAM_DESC *paramDesc);

paramDesc: Points to the parameter descriptor.

Usage

Run the mi_qual_param_isexpression() function to determine whether the parameter is an expression before you run the mi_qual_param_expression() function.

Return values

A pointer to the qualification descriptor for the parameter.

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