Tarek Ziadé wrote:
Hi,
I use a global session instance to work with my DB, so all module
import it and use it. But at some point I sometimes need to
reconfigure the engine to use another DB. I want to reconfigure the
existing instance so other modules can still use the same session
object to work with the DB.
can I safely change the bind attribute of an existing scoped session
or is there any things to be taken care of before I do it ? (like
closing active connections in the pool maybe ?)
I've tried to use configure to reset the engine, but it doesn't work
(the bind attribute remain unchanged) :
from sqlalchemy.orm import scoped_session, sessionmaker
from sqlalchemy import create_engine
Session = scoped_session(sessionmaker())
Session.configure(bind=create_engine('sqlite:///tmp/db1'))
Session.bind
Engine(sqlite:///tmp/db1)
add Session.remove() here. configure() only works for the
not-yet-created session.
Otherwise, you can just say Session.bind = create_engine(...) which will
only change the current session.
configure() is more so that various parts of an applications startup can
add their elements to a global session config.
Session.configure(bind=create_engine('sqlite:///tmp/db2'))
Session.bind
Engine(sqlite:///tmp/db1) --- same !
So, it this safe :
from sqlalchemy.orm import scoped_session, sessionmaker
from sqlalchemy import create_engine
Session = scoped_session(sessionmaker())
Session.configure(bind=create_engine('sqlite:///tmp/db1'))
Session.bind
Engine(sqlite:///tmp/db1)
Session.bind = create_engine('sqlite:///tmp/db2')
Session.bind
Engine(sqlite:///tmp/db2)
Thanks
Tarek
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