OK, next question.
Well... two related questions. :)
1) In general, inside an object's method def, where I am doing
arbitrary calculations, how can I get access to the session the object
is bound to in order to run other queries?
2) More specifically, I want to make a filtered and computed
On Wednesday 17 June 2009 19.08:10 klaus wrote:
... whether a query will yield any result ...
The best approximation
seems to be
query.first() is not None
which can select a lot of columns. I often see
query.count() 0
which can become quite expensive on a DBMS like PostgreSQL.
Hi,
I'm using sqlalchemy 0.4.8 and I'm looking for a safe deletion
extension (if exists one).
With safe deletion I mean to mark a record as deleted, not to
physically delete it, for example there is an extension for RoR called
acts as paranoid[1].
This extension add a deleted_at field to the
Hello, I have a question regarding SQLAlchemy(0.4) with PyODBC,
SQLServer 2008.
I want to insert Unicode data and query values should be prefixed with
'N' like INSERT INTO test VALUES(N'Сърцето и черният й дроб'). Is this
possible with SA 0.4?
The main problem with SQL Server is that needs
On Jun 18, 2009, at 1:58 AM, allen.fowler wrote:
you can, you can use a validator that rejects all changes, or if
you're
brave you can create a custom __setattribute__ method that brokers
all
attribute setter access. the former is in the SQLA mapping docs the
latter is part of
On Jun 18, 2009, at 6:03 AM, Alberto Granzotto wrote:
Hi,
I'm using sqlalchemy 0.4.8 and I'm looking for a safe deletion
extension (if exists one).
With safe deletion I mean to mark a record as deleted, not to
physically delete it, for example there is an extension for RoR called
acts as
On Jun 18, 2009, at 1:02 AM, Michael Mileusnich wrote:
I know I have asked this before but I would like some clarification.
If I do something like :
i = query(table).all
for instance in i:
thread_class(i.ID)
thread_class.start()
del thread_class
and do an additional query in the
On Jun 18, 2009, at 2:27 AM, AF wrote:
OK, next question.
Well... two related questions. :)
1) In general, inside an object's method def, where I am doing
arbitrary calculations, how can I get access to the session the object
is bound to in order to run other queries?
PyODBC accepts unicode strings (and by that I mean Python unicode,
u'some string') directly on most platforms. No N character is
needed (unless PyODBC or the odbc driver does this behind the
scenes). Our MSSQL dialect does detect certain builds where this is
not possible and instead
Hi list!
It's been a long time since I've posted here. SA is still the best
Python ORM; thanks for all your hard work Mike!
Now, the question. I've got a set of related entities:
Order (has items)
Item (has attributes)
Attribute
I am working on optimizing the loading and have run into a
You should put this into your .freetds.conf file to ensure that
FreeTDS will tell iconv to do the right thing (my understanding is
that all unicode data is encoded to UCS-2 by FreeTDS)
tds version = 8.0
client charset = UTF-8
SQL Alchemy create_engine has an encoding kwarg:
On Jun 18, 2009, at 11:09 AM, Daniel wrote:
Hi list!
It's been a long time since I've posted here. SA is still the best
Python ORM; thanks for all your hard work Mike!
Now, the question. I've got a set of related entities:
Order (has items)
Item (has attributes)
Attribute
I am
Well, out of the box it didn't work, I pasted a sample code here:
http://pastebin.com/m104b32e0 (note that strings are bulgarian characters
not #1040 as put by pastebin. My FreeTDS/ODBC are:
--- freetds.conf
[Observations_TDS]
host = 10.0.0.50
port = 1433
tds
On 18 Giu, 15:38, Michael Bayer mike...@zzzcomputing.com wrote:
On Jun 18, 2009, at 6:03 AM, Alberto Granzotto wrote:
Hi,
I'm using sqlalchemy 0.4.8 and I'm looking for a safe deletion
extension (if exists one).
With safe deletion I mean to mark a record as deleted, not to
The wirdest thing is that if I write:
ob = Test2('just a test')
session.save(ob)
session.commit()
2009-06-18 17:08:15,251 INFO sqlalchemy.engine.base.Engine.0x..74 INSERT
INTO test2 (comment) VALUES (?)
2009-06-18 17:08:15,251 INFO sqlalchemy.engine.base.Engine.0x..74 ['just a
test']
2009-06-18
On Jun 18, 2009, at 1:47 PM, Alberto Granzotto wrote:
On 18 Giu, 15:38, Michael Bayer mike...@zzzcomputing.com wrote:
On Jun 18, 2009, at 6:03 AM, Alberto Granzotto wrote:
Hi,
I'm using sqlalchemy 0.4.8 and I'm looking for a safe deletion
extension (if exists one).
With safe
I dont really understand the case here.
My first example wasn't very good. In an attempt to keep it simple I
actually made it too simple. Here's another example:
Order (has items)
Item (has attributes, has tags)
Attribute
Tag
If I set both Item.attributes and Item.tags to eager-load, then my
Clarification:
If I set both Item.attributes and Item.tags to eager-load, then my
result set size is the product of len(attributes) * len(tags), which
is where the result set becomes HUGE.
I jumped right from the eager-load to the completely non-optimized (no
eager loading) scenario:
This
On Jun 18, 2009, at 2:19 PM, millerdev wrote:
This would be done by the loader strategy (probably a variant of
LazyLoader), which would issue a single query. The result of that
query would be used to populate the attributes collection of each item
on the order.
hey Daniel -
Good to have
So this is some variant of, i have a bunch of objects and I'd like to
...
snip lots of reasons why this should not be a standard feature
Yeah, I understand what I'm asking for here, and I would never expect
this kind of optimization to kick in by default. Instead, it would
only be used in
I'm building a complex ETL tool with SQLAlchemy that will sometimes
need to let the user preview a changed record - not actually carry
out the update, just find out which fields would be changed, and to
what values. I'm having trouble figuring out a good way to do it.
Is there a way to get a
On Jun 18, 2009, at 4:27 PM, Catherine Devlin wrote:
I'm building a complex ETL tool with SQLAlchemy that will sometimes
need to let the user preview a changed record - not actually carry
out the update, just find out which fields would be changed, and to
what values. I'm having trouble
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