Home
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_boolop() accessor functionThe mi_qual_boolop() function retrieves the Boolean operator that combines two qualifications in a complex expression.

The mi_qual_boolop() accessor function

The mi_qual_boolop() function retrieves the Boolean operator that combines two qualifications in a complex expression.

Syntax

MI_AM_BOOLOP mi_qual_boolop(MI_AM_QUAL_DESC *qualDesc);

qualDesc: Points to the qualification descriptor.

Usage

The access method first obtains results for the simple functions in a complex qualification. To determine how to combine the results that the access method has so far, it can call the mi_qual_boolop() function.

Return values

MI_BOOLOP_NONE: Indicates that the current qualification does not contain a Boolean operator.
MI_BOOLOP_AND: Indicates that the current qualification contains a Boolean AND operator.
MI_BOOLOP_OR: Indicates that the current qualification contains a Boolean OR operator.

Rate this topic

5 stars 4 stars 3 stars 2 stars 1 star

Comment on this topic.

By clicking this box, you acknowledge that you are NOT a U.S. Federal Government employee or agency, nor are you submitting information with respect to or on behalf of one. HCL provides software and services to U.S. Federal Government customers through its partners immixGroup, Inc. Contact this team at https://hcltechsw.com/resources/us-government-contact. Do not include any personal data in this Comment box.