Hi,
I wrote a query joining a couple of tables, returning over a hundred thousand
rows. Since I only needed to access a couple of the attributes of the returned
objects for this specific use case, I thought to use a dozen or so
Query.options(defer(...)) calls to avoid loading the unneeded
the path would be to figure out if the logic of a per-query defer option can
somehow be linked to the attribute when it hits its normal refresh logic - if
those attribute were set up as deferred at the mapper config level (where
deferred is usually used), you wouldn't see this overhead since
I did need the objects, not just the raw data, otherwise I'd had to duplicate a
bunch of existing code which expected full-blown objects to operate on.
Modifying the mapper is not really an option unless the majority of the users
have the same requirements, otherwise I end up having to add a
Michael,
On 03/07/2013 22:20, Michael Bayer wrote:
Hey all -
SQLAlchemy release 0.8.2 is now available.
0.8.2 includes several dozen bug fixes and new features, including refinement
of some of the new features introduced in 0.8.
Areas of improvement include Core, ORM, as well as specific
hello,
I've previously defined inserts and updates by hand in my application,
which is working fine, not using SQLAlchemy at the moment.
At this point, I'd like to employ SQLAlchemy to generate these inserts and
updates for me. And that's all.
I mean: just generate the queries for me. I'm *not*
If I do a query like this:
return PcpPostModel.query.filter_by(id=post_id).options(
FromCache(default)
)
and then later I do another query like this:
PcpPostModel.query.options(FromCache(default)).all()
Any models that were returned by the first query are
On a tangent...
I just noticed that there are several dozen (if not hundreds) of SqlAlchemy
projects on PyPi
Perhaps SqlAlchemy is now large enough that it should have it's own
classifier ?
Something like...
Topic :: Database :: Front-Ends :: SqlAlchemy
Topic :: Database ::
I serialize all my cached data into a dict or json before caching, then
unserialize into whatever object i need.
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well what kind of data are we talking about? defer()'s use case was for binary
large objects and such, fields that are many K/Megs in size. if you're
deferring a bunch of ints, then yes it's not optimized very well for that.
Half of the overhead could be easily fixed here, creating those
I noticed that between runs my cache hit rate using dogpile query caching
could change without any of the underlying data structures changing, after
digging in what I found was the join order on my polymorphic classes is not
deterministic. Is there any way to ensure a deterministic join order
please try out this patch:
http://www.sqlalchemy.org/trac/attachment/ticket/2778/2778.patch
which refactors this particular system to not require the production of a new
object per instance, which is the slowest part of this, and also inlines the
work of assembling the callable. This should
On Thu, Jul 11, 2013 at 4:30 PM, Richard Gomes rgomes.i...@gmail.com wrote:
hello,
I've previously defined inserts and updates by hand in my application, which
is working fine, not using SQLAlchemy at the moment.
At this point, I'd like to employ SQLAlchemy to generate these inserts and
On Jul 11, 2013, at 11:30 AM, Richard Gomes rgomes.i...@gmail.com wrote:
hello,
I've previously defined inserts and updates by hand in my application, which
is working fine, not using SQLAlchemy at the moment.
At this point, I'd like to employ SQLAlchemy to generate these inserts and
On Jul 11, 2013, at 11:43 AM, Amir Elaguizy aelag...@gmail.com wrote:
If I do a query like this:
return PcpPostModel.query.filter_by(id=post_id).options(
FromCache(default)
)
and then later I do another query like this:
hey i like that idea. have any friends at pypi ?
On Jul 11, 2013, at 1:13 PM, Jonathan Vanasco jvana...@gmail.com wrote:
On a tangent...
I just noticed that there are several dozen (if not hundreds) of SqlAlchemy
projects on PyPi
Perhaps SqlAlchemy is now large enough that it should
Michael,
Thanks for the reply. I understand what you're saying and can go search for
that. I wonder if you could take a look at my question about join order
determinism in polymorphic queries?
Thanks,
Amir
On Thursday, July 11, 2013 11:09:50 AM UTC-7, Michael Bayer wrote:
On Jul 11, 2013,
when you say between runs, you mean whole new processes with new mappers,
right? there are some memoized sets involved in polymorphic loading, those
sets should not change order as the program runs but across runs there may be
some changes in order.to improve this I'd need you to provide a
Michael,
That works!
Amir
On Thursday, July 11, 2013 11:17:27 AM UTC-7, Michael Bayer wrote:
when you say between runs, you mean whole new processes with new
mappers, right? there are some memoized sets involved in polymorphic
loading, those sets should not change order as the program
just that, huh. the tricky thing is its difficult to ensure that a set()
doesn't find its way in there at some point and mess the order up again.
open up a ticket for this one I'd need to come up with a test.
On Jul 11, 2013, at 2:19 PM, Amir Elaguizy aelag...@gmail.com wrote:
http://www.sqlalchemy.org/trac/ticket/2779
On Thursday, July 11, 2013 11:23:32 AM UTC-7, Michael Bayer wrote:
just that, huh. the tricky thing is its difficult to ensure that a set()
doesn't find its way in there at some point and mess the order up again.
open up a ticket for this one
Hello Michael,
Thanks a lot for your help :)
I've followed your directions. it works.
Regarding the reserved column names (now I remember I saw this
yesterday) ... it does not happen because I'm restricting the field
names which appear in the SET clause, so that there's no collision
between
Mike, thanks again. I finally found time to integrate your
recommendations. https://github.com/jvanasco/pyramid_sqlassist
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Hi all,
I have been writing to my database using func.now(6) for datetime(6) valued
columns and it has worked perfectly. However, I've recently run into an
issue with querying for these values. It would appear that every time I
query for the values in datetime(6) columns it returns None.
Sorry, forgot to mention this is for mysql.
http://dev.mysql.com/doc/refman/5.6/en/fractional-seconds.html
On Thursday, July 11, 2013 4:38:03 PM UTC-4, Matt wrote:
Hi all,
I have been writing to my database using func.now(6) for datetime(6)
valued columns and it has worked perfectly.
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