[Zope-DB] Auto-reconnect in DCOracle2

Chris Withers chris at simplistix.co.uk
Wed Sep 24 11:04:10 EDT 2003

Christian Theune wrote:
>>>On this last point, has anyone implemented something like an 
>>>'auto-reconnect' feature for DCOracle 2 so that the user never sees the 
>>>DCOracle2 Error: (1012, 'ORA-01012: not logged on') message?
>>Hmmm, I'm guessing ZSQL methods call the DA/Connection object to get the 
>>database connection? Is there anything that can be done in 
>>Shared.DC.ZRDB.Connection.Connection.__call__ to do this re-connection if the 
>>connection is found to be disconnected?
>>What would be the best way to find out if the connection is disconnected?
> Only the python database module can know that for sure. 

And how would it know?

> Actually the
> ZRDB API doesn't require anything to be Python DB API compliant, so you
> can't count on that. Most DAs use _v_connected != None to indicate they
> (not the python modules) have a connection.

Indeed, but this doesn't actually tell me whether the connection works or not.
In this thread, the _v_connected will be not None, but the Oracle connection has 
gone away and so the user sees unsightly error messages when a ZSQL method tries 
to use the connection.

What I'm after is code that will cause the connection to silently re-connect if 
this happens.

Anyone got any ideas?



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