BAT

BAT mk Tue, 03/30/2010 - 16:44

8.39 Binary Association Tables

This module contains the commands and patterns to manage Binary Association Tables (BATs). The relational operations you can execute on BATs have the form of a neat algebra, described in algebra.mx

But a database system needs more that just this algebra, since often it is crucial to do table-updates (this would not be permitted in a strict algebra).

All commands needed for BAT updates, property management, basic I/O, persistence, and storage options can be found in this module.

All parameters to the modules are passed by reference. In particular, this means that string values are passed to the module layer as (str *) and we have to de-reference them before entering the gdk library. (Actual a design error in gdk to differentiate passing int/str) This calls for knowledge on the underlying BAT types`s