Heston,
Heston James wrote:
> Werner,
>
> Thank you for your response, very kind of you. This looks to be more
> what I'm looking for, after a quick test it seems that it is now
> applying the limit at the SQL level which is definitly a good thing.
>
> Where abouts in the documentation did you find that? Look here:
> http://www.sqlalchemy.org/docs/05/ormtutorial.html is seems to
> reccomend the same method as reccomended by the first repsonder, is
> that a fault in the docs perhaps?
>
It is from the api doc, see here:
http://www.sqlalchemy.org/docs/05/sqlalchemy_orm_query.html
When I search for things on the doc page I mostly click first on the
link in the top right "One page", unless I know which section contains
what I am looking for.
> The next challegne I've noticed with using Limit() is that it doesnt
> appear to return an array of objects, but instead, a query object, so
> when I try and perform an evaluation on it like so:
>
> if len(the_objects):
>
> I get an error which states:
>
> TypeError: object of type 'Query' has no len()
>
> Why is this? Does using Limit() mean that we're returning query
> objects instead of the array of objects I was getting before?
>
Yes (now take my answer with a grain of salt, I am by no means an SA
expert, nor even an advanced user).
In the 0.5 version you can do things like:
query = session.query(db.Mytable)
query = query.order_by(....)
query = query.limit(3)
... etc
but then you need to tell it to actually get the data, with
.first(), .one(), .all()
or iterate over it, e.g.
for aninstance in query:
print aninstance
Hope this helps, and if I said something wrong I hope someone corrects me.
Werner
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