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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_constant_typeid() accessor functionThe mi_qual_constant_typeid() function returns the data type of the constant.

The mi_qual_constant_typeid() accessor function

The mi_qual_constant_typeid() function returns the data type of the constant.

Syntax

MI_TYPEID* mi_qual_constant_typeid(MI_AM_QUAL_DESC *qualDesc);

qualDesc: Points to the qualification descriptor.

Usage

Use the mi_qual_constant_typeid() function to determine whether the data type of the constant is the same as the data type of the column. If the data types of the constant and the column are not compatible, cast the constant to a compatible data type.

Return values

A pointer to an MI_TYPEID object that contains information about the data type of the constant.

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