On Fri, Jan 9, 2015 at 2:21 PM, Michael Bayer <mike...@zzzcomputing.com> wrote:
>
>
> Jon Nelson <jnel...@jamponi.net> wrote:
>
>>
>>> so you could use either merge() or merge_result() but to avoid any SQL set
>>> load=False.
>>
>> When I tried with load=False, I got an error. I am using 0.9.8.
>
> care to be more specific
Absolutely.
It took me a bit to grab a bite to eat and whip up a quick test example.
I hope the following is more useful!
With the following code, I see one query (as expected):
SELECT foo.c1 AS foo_c1, foo.c2 AS foo_c2
FROM foo
WHERE foo.c1 IN (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
Followed by 10 more queries (unexpected).
If I use merge_result the same thing happens.
If I use merge_result with load=False, I get the following error:
sqlalchemy.exc.InvalidRequestError: merge() with load=False option
does not support objects transient (i.e. unpersisted) objects.
flush() all changes on mapped instances before merging with
load=False.
<NOT VERY GOOD CODE>
import logging
import sqlalchemy as sa
from sqlalchemy.ext.declarative import declarative_base
Base = declarative_base()
class Foo(Base):
__tablename__ = 'foo'
c1 = sa.Column(sa.INTEGER(), primary_key=True, nullable=False)
c2 = sa.Column(sa.Unicode(), nullable=False)
def test(dbsess_factory):
dbsess = dbsess_factory()
with dbsess.begin():
keys = list(range(10))
foos = [ Foo(c1=i, c2=u'%d' % (i,)) for i in keys ]
dbsess.query(Foo).filter(Foo.c1.in_(keys)).all()
[ dbsess.merge(f) for f in foos ]
# also tried:
# dbsess.query(Foo).merge_result(foos)
def main():
engine = sa.create_engine('sqlite:///foo.db')
Base.metadata.create_all(engine)
dbsess_factory = sa.orm.sessionmaker(bind=engine, autocommit=True,
autoflush=False)
test(dbsess_factory)
if __name__ == '__main__':
logging.basicConfig(level=logging.INFO)
logging.getLogger('sqlalchemy.engine').setLevel(logging.INFO)
main()
</NOT VERY GOOD CODE>
--
Jon
Software Blacksmith
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