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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_init_am_qual() accessor functionThe mi_init_am_qual() function reinitializes all parts of the qualification to MI_VALUE_NOT_EVALUATED.

The mi_init_am_qual() accessor function

The mi_init_am_qual() function reinitializes all parts of the qualification to MI_VALUE_NOT_EVALUATED.

Syntax

void mi_init_am_qual(MI_AM_QUAL_DESC *qualDesc);

qualDesc: Points to the qualification descriptor.

Usage

The database server does not initialize the results area of a qualification descriptor to MI_VALUE_NOT_EVALUATED after a call to mi_eval_am_qual() changes the results value to MI_VALUE_TRUE or MI_VALUE_FALSE. To initialize the qualification results for the next row, have am_getnext call mi_init_am_qual().

Return values

None

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