[Twisted-Python] twisted.news adbapi backend

Stephen C. Waterbury golux at comcast.net
Thu Sep 25 22:55:01 EDT 2003

I'm guessing this has never been used (at least with
pyPgSQL, anyway), since it has a function listRequest
defined thusly:

def listRequest(self):
         # COALESCE may not be totally portable
         # it is shorthand for
         # CASE WHEN (first parameter) IS NOT NULL then (first 
parameter) ELSE (second parameter) END
         sql = """
             SELECT groups.name,
                 COALESCE(MAX(postings.article_index), 0),
                 COALESCE(MIN(postings.article_index), 0),
             FROM groups LEFT OUTER JOIN postings
             ON postings.group_id = groups.group_id
             GROUP BY groups.name, groups.flags
             ORDER BY groups.name
         return self.runQuery(sql)

... but PostgreSQL doesn't implement a COALESCE command.

And my next guess would be that it's never been tested,
either.  Correct?

If so, maybe it should be either be fixed or jettisoned,
or at least relegated to the sandbox.

- Steve.

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