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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_funcname() accessor functionThe mi_qual_funcname() function returns the name of a qualification function.

The mi_qual_funcname() accessor function

The mi_qual_funcname() function returns the name of a qualification function.

Syntax

mi_string * mi_qual_funcname(MI_AM_QUAL_DESC *qualDesc)

qualDesc: Points to the qualification descriptor.

Usage

If mi_qual_funcid() returns a negative value instead of a valid routine identifier, the qualification function is not registered in the database. The access method might call the qualification function by name from the access-method library or send the function name and arguments to external software.

Return values

The return string contains the name of a simple function in the qualification.

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