Wiki consisting of rows in a db table

Consider a wiki that lets you edit rows in a db table. Each page is a
row in the table, and has fields that anyone can edit. Like all wikis,
it keeps a history of edits (including who made the edits), and lets
you revert an edit, or even delete a row (page) completely.

Has anyone implemented something like this? This MediaWiki extension:

http://www.mediawiki.org/wiki/Extension:WikiDB

looks interesting, but it doesn't appear to support full SQL querying?

I'm looking more for a wiki-editable database, not a database-enabled
wiki, though having MediaWiki functionality would be nice.
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