Hi guys,
I came across a bunch of issues in a relatively simple code I got when
upgraded to SQLA 2.0. Below I provided issues seen and solutions, but very
much welcome any corrections. I thought this might come in handy for some.
As a side note not since the move from like 0.4 to 0.5 or 0.6
That's for CHAR not NCHAR. I will open a bug report.
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The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
To post example code, please provide an MCVE: Minimal, Complete, and Verifiable
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A bit of advocacy from my side on cx_Oracle:
https://github.com/oracle/python-cx_Oracle/issues/365
Mike, there's something you might want to look at. We have this monkey
patch on SQLAlchemy in our recent code, which was necessary to get the
correct behavior for NCHAR columns.
from
I'd add that other dialects such as pyodbc+mssql work as expected, which is
to ignore trailing white space in fixed width character fields for
comparison purposes.
On Thursday, October 3, 2019 at 4:47:41 AM UTC-4, mdob wrote:
>
> Hi everyone,
>
> There's IMO unusual behavior in Oracle when
Using ORM querying what is the best practice for limiting the output to a
given number of resulting *entities*?
Consider this model:
from sqlalchemy import Column, DateTime, String, Integer, ForeignKey, func
from sqlalchemy.orm import relationship, backref
from sqlalchemy.ext.declarative import
ELECT * from T WHERE C1 = :param1 and C2 = 'Group :A'")
>>> print(q.compile())
SELECT * from T WHERE C1 = :param1 and C2 = 'Group :A'
>>> print(q.compile().params)
{'param1': None, 'A': None}
On Thursday, March 21, 2019 at 4:11:45 PM UTC-4, Mike Bayer wrote:
>
> On
Thanks Mike, though the question is valid - why does regex in SQLAlchemy
allow for discovering parameter token inside quotes? Have you seen a
legitimate case for that?
On Wednesday, March 20, 2019 at 9:58:58 AM UTC-4, Mike Bayer wrote:
>
> On Wed, Mar 20, 2019 at 7:59 AM mdob >
> wrote:
> >
Reflecting stored procedure as first class model objects could be very
useful. I would imagine those objects be Python callable bound to an engine
or session.
On Tuesday, August 16, 2016 at 10:28:25 AM UTC-4, Mike Bayer wrote:
>
>
>
> On 08/16/2016 03:33 AM, Chris Withers wrote:
> > Gotcha,
I read it, but could you illustrate it with a sample code based on the
classic User/Addresses example?
On Wednesday, June 25, 2014 11:45:12 AM UTC-4, Jonathan Vanasco wrote:
On Tuesday, June 24, 2014 9:40:02 PM UTC-4, Victor Olex wrote:
What I aiming for is to provide users a library
may get a
User back, not a Thinker (or you will, if it hasn’t been expired. you
can’t rely on it being consistent). If that’s OK, then set the flag - it
just wants to check that this is what you intend.
On May 30, 2014, at 1:51 PM, Victor Olex victo...@vtenterprise.com
javascript
, June 24, 2014 6:39:03 PM UTC-4, Michael Bayer wrote:
On 6/24/14, 5:44 PM, Victor Olex wrote:
So, what is the right idiom for building SQLAlchemy persistence into
classes that need to do more than just that i.e. have run-time state. I was
hoping that deriving from SQLAlchemy model classes
Hello all, long time no see...
Is it OK to create classes, which inherit from mapped classes, but are not
meant to be persited and how to do it as to avoid FlushError on related
classes?
from sqlalchemy import *
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import
Hey Mike, thanks for chiming in.
Popular tool Oracle SQL Develoepr generally produces DDL with quoted
identifiers so in real life you will encounter a lot of situations where
some tables were created using quoted and some unquoted as people work on
maintaining the database.
Using lowercase
Have you every found the root cause for this? I am experiencing the same
issue in one of our setups.
On Monday, February 15, 2010 11:47:46 AM UTC-5, fdelia wrote:
hello,
I developed an application that uses SQLAlchemy to write the records on
the server. I have freetds 0.82.6 on the server.
With the understanding that we would loose the ability to properly
track the sate of a mapped object and ability to update or insert in
ORM and likely the ability to correctly use relationships as well -
how can one accomplish a mapper, which would work on tables (views)
without any key, which
rows to come back as individual objects,
Query() can be handed Table objects to load rows from, so a custom Query
subclass that wraps named tuples into objects could possibly approximate this
effect.
On Jun 6, 2012, at 3:01 PM, Victor Olex wrote:
With the understanding that we would
To be clear this is not a feature request. I could use a hit how to
build a fake mapper like this if not compatible in certain cases.
On Jun 6, 5:52 pm, Victor Olex victor.o...@vtenterprise.com wrote:
Thanks. Model that we work with has tables, which have no unique
constraints. Keys can
Yeah, this will keep coming back as long as people work with schemas,
which use fixed length character types (CHAR, NCHAR), which is
probably for another 30 years. May I propose an enhancement to String
(and as a result to CHAR, NCHAR and Unicode) to take trim=False
keyword and effect a TRIM()
I am curious if Events (new feature as of 0.7) could be used to reduce
memory footprint in certain situations or is it better achieved with
other features such as lazy loading.
For example, consider a complex mapped object (containing at least one
related table). Using joinedload_all option,
something good.
On Nov 7, 1:36 pm, Michael Bayer mike...@zzzcomputing.com wrote:
On Nov 7, 2011, at 7:14 AM, Victor Olex wrote:
I am curious if Events (new feature as of 0.7) could be used to reduce
memory footprint in certain situations or is it better achieved with
other features
I am of the opinion that unless you are absolutely certain that the
data will be pure ASCII you should declare string fields in model as
Unicode type rather than String. Also have a look at
http://farmdev.com/talks/unicode/
because it will help you understand what the dreaded error really
means.
It is worth mentioning that Mike has published slides from his
PyGotham talk on SQLAlchemy architecture, which also covered certain
internal algorithms.
http://techspot.zzzeek.org/2011/09/16/sqlalchemy-at-pygotham/
I am looking forward to watching the video, which should help me get a
grasp of
. Overall the status of ODBC on unix is
extremely concerning to me as there doesn't seem to be anyone around to help
with anything.
On Sep 12, 2011, at 3:27 PM, Victor Olex wrote:
I confirm successful build and run time on both 64-bit and 32-bit
Linux (RHEL5) againt SQL Server 2008
not occur. Neither
SQLite nor pysqlite version have changed.
--
Victor Olex
http://linkedin.com/in/victorolex
http://twitter.com/agilevic
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of the CPPFLAGS=-DBUILD_LEGACY_64_BIT_MODE -
DSIZEOF_LONG_INT=8 allowed me to align the libs to the Pyodbc such
that the segfault got eliminated but in the end the flags proved
unneccesary once the above mentioned include path was properly set.
On Sep 9, 10:54 pm, Victor Olex victor.o...@vtenterprise.com
What version of pyodbc?
On Sep 9, 11:08 am, Michael Bayer mike...@zzzcomputing.com wrote:
On Sep 9, 2011, at 10:48 AM, Michael Bayer wrote:
It also makes me less than comfortable unconditionally emitting a u'' for a
bound parameter as it appears to cause problems.
I've also checked my
and tried that one too.
Has pyodbc made adjustments to changes in FreeTDS 0.91 ?
On Sep 9, 2011, at 1:15 PM, Victor Olex wrote:
What version of pyodbc?
On Sep 9, 11:08 am, Michael Bayer mike...@zzzcomputing.com wrote:
On Sep 9, 2011, at 10:48 AM, Michael Bayer wrote:
It also makes me less
vary
based on architecture
At run time be sure to have the LD_LIBRARY_PATH and TDSVER=8.0
variables set. The latter is not needed if you put the same into
connection string as I have in the example above.
I hope this helps.
Victor Olex
http://linkedin.com/in/victorolex
http://twitter.com/agilevic
/userguide/config.htm
On Sep 8, 10:32 am, Michael Bayer mike...@zzzcomputing.com wrote:
On Sep 8, 2011, at 9:37 AM, Victor Olex wrote:
I never for a moment thought that your change was thoughtless. To the
contrary, I have huge respect for SQLAlchemy. I will try to test the
drop_all and your
, Victor Olex wrote:
Pyodbc issue 209 works fine in my setup.
that is very strange ? There are files missing from the .zip. If you
installed from the zip I don't see how it built for you. Here's the original
issue:
http://code.google.com/p/pyodbc/issues/detail?id=192
I think
Since you are effectively overwriting the table with new file
contents, the fastest may well be to truncate the table then insert
all contents. If you were to just append and update then
session.merge() is convenient way to do this though I am not sure if
the fastest.
On Sep 7, 5:53 pm, Vlad K.
?
On Sep 8, 2011, at 12:41 PM, Victor Olex wrote:
I know of those issues with pyodbc package. Michael, please read my
first response where I wrote how to build the unixODBC, FreeTDS and
pyodbc stack. I gave this detail for a reason - i.e. that you can
replicate my built.
By the way I did
wrote:
thanks, the two test failures would be expected in this case, will see what
response I get on the FreeTDS list if any.
On Sep 8, 2011, at 3:07 PM, Victor Olex wrote:
Unfortunately I don't have access to a blank database and I took the
chance and ran your tests on a non-empty database
correctly as does the in memory object. Different version
combinations of pyodbc, FreeTDS and SQL may likely yield a different
result so unless a deterministic factor is found I would like to
propose adding parameter bind_unicode to dialect class and connection
url.
Regards and respect,
Victor Olex
http
):
return value.rstrip()
On Sep 14, 11:49 am, Michael Bayer mike...@zzzcomputing.com wrote:
On Sep 14, 2010, at 11:42 AM, Victor Olex wrote:
We have discussed one aspect of this before and it was hugely helpful
(http://groups.google.com/group/sqlalchemy/browse_thread/thread
By database we refer to a separate instance (could be on another
server) of equvalent database i.e. production and development
environments.
Using sqlalchemy.ext.declarative, what would be a correct pattern to
enable one model to connect to two equivalent databases?
Consider:
--- model.py ---
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