Well, not by exactly using SQLAlchemy's provided implementation of
joined table inheritance, because it uses a discriminator column that
only holds a single value. Of course it is possible to create more
complex inheritance structures on your own, just without some of the
polymorphic-loading work
Hey,
this is just some specific PostgreSQL behaviour. If there's an error
in a transaction it closes the transaction and nothing can be done
with it anymore. You need to catch such errors and close the session
or at least commit to close the transaction. If you that the
following queries will
On Nov 6, 2010, at 1:32 AM, pianoman wrote:
Hi
I feel I have exhausted all the usual options in finding a solution
for this problem.
I'm using Python 2.5.5, SQLAlchemy 0.4.6, and Elixir 0.5.2. I'm really
not sure how much code I should include for this to make any sense to
others.
On 11/6/2010 12:15 AM, Christopher Grebs wrote:
this is just some specific PostgreSQL behaviour. If there's an error
in a transaction it closes the transaction and nothing can be done
with it anymore. You need to catch such errors and close the session
or at least commit to close the
Hello all. I'm currently working on a Pylons project, and working on a
model for organizing images on the site. I have yet to even implement
anything relating to its function, since I keep on receiving the
following error pertaining to the model:
InvalidRequestError: One or more mappers failed to
Thanks, Michael. We're now doing something similar to your suggestion:
monkey-patching Session.flush() to check len(Session.dirty) == 0. This
seems to work OK.
We can't rely on read-only DB-level users because we also use sqlite
for testing purposes, and we'd like to catch errors there too
On Nov 6, 2010, at 2:13 PM, Yang Zhang wrote:
Thanks, Michael. We're now doing something similar to your suggestion:
monkey-patching Session.flush() to check len(Session.dirty) == 0. This
seems to work OK.
We can't rely on read-only DB-level users because we also use sqlite
for testing
Thank you so much, Michael! It makes sense. I just tried it out, and it
works correctly. I should have asked this question sooner. I would have
saved myself a lot of wasted effort.
On Sat, Nov 6, 2010 at 2:28 PM, Michael Bayer mike...@zzzcomputing.comwrote:
On Nov 6, 2010, at 1:26 PM,
Mike,
I made the assumption parameters would always be a dictionary:
from sqlalchemy.interfaces import ConnectionProxy
class PostgresProxy(ConnectionProxy):
Low level connection proxy to change all empty string '' to None,
so that
postgres and Oracle behave the same for us
On Nov 6, 2010, at 3:12 PM, Kent wrote:
Mike,
I made the assumption parameters would always be a dictionary:
from sqlalchemy.interfaces import ConnectionProxy
class PostgresProxy(ConnectionProxy):
Low level connection proxy to change all empty string '' to None,
so that
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