[Twisted-Python] reconnecting ConnectionPools

Christopher Armstrong radix at twistedmatrix.com
Sun Jul 25 18:49:01 EDT 2004

Dave Peticolas wrote:
> On Sun, 2004-07-25 at 12:41, Itamar Shtull-Trauring wrote:
>>On Sun, 2004-07-25 at 13:28, Christopher Armstrong wrote:
>>>I've been trying to think of a way to at least work around this on a 
>>>per-app basis -- mine is using psycopg. It just raises either a 
>>>ProgrammingError or an OperationalError on cursor.execute. The brightest 
>>>idea we've come up with is to reconnect after N (~ 3) consecutive errors.
>>>Any other ideas?
>>Upon errors, test a command that will always work ("SELECT 1"), if that
>>fails reconnect.
> The test command should be easily overridden.
> You would think all db's would support 'select 1',
> but they don't. On Oracle, for example, you would
> need 'select 1 from dual'.

Hmm, but can we put this functionality in adbapi? Maybe with an __init__ 
flag, cp_detectConnectionLost?

  Twisted | Christopher Armstrong: International Man of Twistery
   Radix  |          Release Manager,  Twisted Project
---------+           http://radix.twistedmatrix.com/
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