Re: [HACKERS] [PATCH] Pattern based listeners for asynchronousmessaging (LISTEN/NOTIFY)

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От Markus Sintonen
Тема Re: [HACKERS] [PATCH] Pattern based listeners for asynchronousmessaging (LISTEN/NOTIFY)
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Msg-id CAMpj9JZzZ83Te81mL3+HY-U2rwMp3AQQjZ4M9=H2SOsETuthxg@mail.gmail.com
обсуждение исходный текст
Ответ на Re: [HACKERS] [PATCH] Pattern based listeners for asynchronousmessaging (LISTEN/NOTIFY)  (Peter Eisentraut <peter.eisentraut@2ndquadrant.com>)
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The following does not work:
LISTEN 'foo%'
Neither this:
LISTEN SIMILAR TO "foo%"
This works:
LISTEN "foo%"
But it does not act as a pattern.

We could change the SIMILAR TO something like following (accepting also type of the pattern), for example:
LISTEN PATTERN 'foo%' TYPE 'similar'
LISTEN PATTERN 'foo*' TYPE 'ltree'
Or
LISTEN PATTERN 'foo%' USING 'similar'
Or
LISTEN MATCH 'foo%' USING 'similar'
Or
LISTEN MATCH 'foo%' TYPE 'similar'

Documentation is coming up.

2017-07-31 23:30 GMT+03:00 Peter Eisentraut <peter.eisentraut@2ndquadrant.com>:
On 7/31/17 16:13, Markus Sintonen wrote:
> This patch has no know backward compatibility issues with the existing
> /LISTEN///UNLISTEN/ features. This is because patch extends the existing
> syntax by accepting quoted strings which define the patterns as opposed
> to the existing SQL literals.

I don't see that in the patch.  Your patch changes the syntax LISTEN
ColId to mean a regular expression.

Even then, having LISTEN "foo" and LISTEN 'foo' mean different things
would probably be confusing.

I would think about specifying an operator somewhere in the syntax, like
you have with LISTEN SIMILAR TO.  It would even be nice if a
non-built-in operator could be used for matching names.

Documentation is missing in the patch.

--
Peter Eisentraut              http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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