[development] Extend database abstraction layer, to include table creation.

[John Pulles]

2006/5/11, Jeff Eaton <jeff at viapositiva.net>:
>
>  The're useful when the structure of a table evolves over time -- for
> example, version 1.45 of module foo adds an index for better performance.
> YOu can change the original definition, but you'll need these additional
> functions to write the update_x() function.
>

Probably a 'diff' can be made to determine the difference between the
current tables (if they are present) and the updated definition. The
install/update system would then process the differences.
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