def setup(**kwargs):
connection = MySQLdb.connections.Connection(**kwargs)
engine = create_engine('mysql://', creator=lambda: connection,
pool_recycle=2)
the "creator" argument is a callable that returns a new connection
when the pool needs one. Above, you are pre-connecting a single MySQL
connection and returning it from the lambda. Besides producing non-
mutexed multithreaded access to the single Connection itself (which
may or may not be OK for MySQLdb), it also prevents a new connection
from being created once it has been recycled. The previous
connection, now closed, is all that's available.
The correct form is:
def setup(**kwargs):
def connect():
return MySQLdb.connections.Connection(**kwargs)
engine = create_engine('mysql://', creator=lambda: connect,
pool_recycle=2)
On Dec 19, 2008, at 6:05 PM, Ken wrote:
>
> I've created a full test case that should reproduce the error for you.
> You'll need to create a database called 'test' on your local machine.
> I think I've isolated the problem to the use of the creator keyword
> argument, which I use in my application for various reasons.
>
> http://rafb.net/p/8Ayjxc63.html
>
> Results in:
>
> http://rafb.net/p/QPoesQ74.html
>
> Here are the versions I used to cause this bug:
>
> mysqld Ver 5.0.67-0ubuntu6 for debian-linux-gnu on i486 ((Ubuntu))
> MySQLdb 1.2.2
>
> For sqlalchemy, I've tried 0.5rc4 and 0.4.8; it happens with either
> version.
>
> On Dec 18, 10:11 am, Michael Bayer <[email protected]> wrote:
>>
>> Would need to see how your create_engine() is configured, what
>> versions of MySQL/MySQLdb are in use.
> >
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