Andreas Jung wrote at 2008-4-9 20:34 +0200:
> ...
>>> Quite possibly
>>> z3c.sqlalchemy has a release that actually works.
>> The current release is not very robust against some kinds of temporary
>> problems. When e.g. the database is restarted, "z3c.sqlalchemy" may
>> enter a state where all database interactions raise an exception
>> until Zope is restarted.
>This is very likely an issue of the underlying SA implementation.

As I have explained to you, "z3c.sqlalchemy" has a big weakness 
when there are any exceptions from commit or abort:
in this case, the SQLAlchemy resources session and connection
are not cleaned up and remain associated with the thread.
This thread will always get the unclean resources -- until a

That's something, "z3c.sqlalchemy" can improve -- independently
from what SQLAlchemy does.

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