Matthew Williams wrote:
From previous posts to this and other lists, it seems that ORMs and
threads don't get along too well...
What makes you think that?
and, as far as I can tell, there's
no way to get away from threads if you don't want longish queries to
block your entire
On Mar 26, 2010, at 3:20 AM, Chris Withers wrote:
Matthew Williams wrote:
From previous posts to this and other lists, it seems that ORMs
and threads don't get along too well...
What makes you think that?
First of all, most of my impressions about ORMs come from SQLAlchemy.
This
Matthew Williams wrote:
It's much trickier if you want to use the ORM, unless you are very
careful to fully eager load every thing in any possible database
operation if you have need of the information subsequently in your
twisted code. Otherwise you may block unexpectedly simply when
accessing
-Original Message-
From: sqlalchemy@googlegroups.com
[mailto:sqlalch...@googlegroups.com] On Behalf Of Matthew Williams
Sent: 26 March 2010 12:10
To: sqlalchemy@googlegroups.com; twisted-pyt...@twistedmatrix.com
Subject: [sqlalchemy] Re: SQLAlchemy, Twisted, and sAsync
On Mar
On Mar 26, 2010, at 7:16 AM, Chris Withers wrote:
Cool. What is it you're doing that needs to mix Twisted and
SQLAlchemy?
The project (an internal project) doesn't really *need* to mix
them... I could just use mysqldb.
Heh, wrong end of the stick again; my question was why you needed to
Hi!,
I'm using SQLAlchemy on a heavily threaded env - something like 30~40
threads working with SQLAlchemy objects.
What you need to watchout is:
* Eager load objects - getting nasty lazyload exceptions is not funny
* Take off the objects from the session and, if you need to use them
later,
King Simon-NFHD78 wrote:
The solution to this is either to eager-load all the attributes you
think you are going to need before handing the instance off to another
thread (difficult), or (probably better) to detach (expunge) the
instance from thread A's session.
Are there any recommended code
Tan Yi wrote:
I want to create a table, say:
employee_table = Table(
'employee',metadata,
Column('id',Integer,primary_key=True),
Column('name',String(255))
)
staffGroup_Table = Table(
'role',metadata,
Fernando Takai wrote:
Hi!,
I'm using SQLAlchemy on a heavily threaded env - something like 30~40
threads working with SQLAlchemy objects.
What you need to watchout is:
* Eager load objects - getting nasty lazyload exceptions is not funny
* Take off the objects from the session and, if you
Thanks for clarification. Sorry that I do not think I understand
circular dependency and compsite key very well.
Also can you help me to read the circular dependency error message? I
mean How to find the circle from the error message of Circular
Dependency.
Here is the error message:
Excuse me,
After your valuable advice, i've modified my code and i've removed the
manual setting of the foreign key (which was completely wrong). But now
i've another problem, maybe due to another misunderstanding.
(I've moved all my ORM classes within the same module now).
I am parsing an xml
Tan Yi wrote:
Thanks for clarification. Sorry that I do not think I understand
circular dependency and compsite key very well.
Also can you help me to read the circular dependency error message? I
mean How to find the circle from the error message of Circular
Dependency.
Here is the error
Hi all,
I would like to create an UniqueConstraint like this one:
CREATE UNIQUE INDEX uniqinx ON prod(lower(name))
Could you help me to translate it to SQLAlchemy using UniqueConstraint ?
Thank you.
j
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Hi Masetto,
On 26/03/2010 16:01, masetto wrote:
Maybe it's a stupid problem but i can't figure it out at the moment :/
Code:
...
for definitions in ovalXML._childrenMap['definitions']:
for definition in definitions.getchildren():
defInst =
Any plans to support MINVALUE, MAXVALUE, CYCLE, NOCYCLE for sequences
(for both postgres and oracle)?
I've implemented a subclass of Sequence myself, but it isn't very
elegant, because I'm not familiar enough with the code to know which
methods to override for create() output.
--
You received
First of all, thanks for your answer :)
# defInst.PlatformRel = [platf]# change this to
platf.definitions = defInst
I don't have any definitions attribute within the PlatformClass, i suppose
you mean the foreign key, isnt'it?
That is
platf.platformId_fk = defInst
However, this results in
Hi there!
We are considering to use SQLAlchemy for a new project. Our first tests
look promising and it is a fun to use SA. But I still have a problem to
implement some special features we would like to have.
For example, I want to store large (tens to hundreds of MB) objects into
the database
masetto wrote:
defInst.PlatformRel = [platf]
dont you mean to be appending here ? definst.platformrel.append(platf)
session.add(defInst)
session.add(platf)
#i perform a commit every 1000 definitions as you suggested :)
Kent wrote:
Any plans to support MINVALUE, MAXVALUE, CYCLE, NOCYCLE for sequences
(for both postgres and oracle)?
I've implemented a subclass of Sequence myself, but it isn't very
elegant, because I'm not familiar enough with the code to know which
methods to override for create() output.
Kent wrote:
Any plans to support MINVALUE, MAXVALUE, CYCLE, NOCYCLE for sequences
(for both postgres and oracle)?
I've implemented a subclass of Sequence myself, but it isn't very
elegant, because I'm not familiar enough with the code to know which
methods to override for create() output.
Torsten Landschoff wrote:
While the extension gets called and tries to replace the relation, SA
still tries to insert the new entry.
Any way to get this implemented?
here's the relevant bit of documentation:
Michael,
On Mar 25, 3:00 pm, Michael Bayer mike...@zzzcomputing.com wrote:
SQLAlchemy also doesn't issue BEGIN. You might want to look at setting
autocommit to false on your MySQLdb connection, since that's the layer that
would be sending out BEGIN.
I looked into this. BTW, I use
Hi Masetto,
On 26/03/2010 17:43, masetto wrote:
First of all, thanks for your answer :)
You are welcome.
# defInst.PlatformRel = [platf]# change this to
platf.definitions = defInst
I don't have any definitions attribute within the PlatformClass, i
suppose you mean the foreign key,
Hejhej,
first I'd like to thank the developers of SQLAlchemy for their great
effort. The library works like a treat and is well documented. It's a
pleasure working with it...
Nevertheless I've currently run into a problem when trying to create
classes that are based on read-only reflection from
mr wrote:
Hejhej,
first I'd like to thank the developers of SQLAlchemy for their great
effort. The library works like a treat and is well documented. It's a
pleasure working with it...
Nevertheless I've currently run into a problem when trying to create
classes that are based on read-only
keith cascio wrote:
Every COMMIT is followed by a ROLLBACK, which appears wasteful. Which
software do I blame for that, SQLAlchemy or the MySQLdb DBAPI
connector?
It's not wasteful at all in the usual case unless one wants to have
leftover row/table locks and transactional state sitting idle
Thanks for the info.
Since it is NOCYCLE in oracle and NO CYCLE in postgres, I would check
the engine.dialect.name in the compile, method correct?
if eng.dialect.name == 'oracle':
sql += NOCYCLE
elif eng.dialect.name ==
Sorry!
Nevermind, your link answers that question.
Thanks.
On Mar 26, 4:23 pm, Kent Bower k...@retailarchitects.com wrote:
Thanks for the info.
Since it is NOCYCLE in oracle and NO CYCLE in postgres, I would check
the engine.dialect.name in the compile, method correct?
Hi Michael,
On Fri, 2010-03-26 at 14:30 -0400, Michael Bayer wrote:
here's the relevant bit of documentation:
http://www.sqlalchemy.org/docs/reference/orm/interfaces.html?highlight=mapperextension#sqlalchemy.orm.interfaces.MapperExtension.before_insert
Column-based attributes can be
Michael,
I apologize if I came off at all rude. I noticed how helpful you are
and I value your advice. Thank you for your patience.
On Mar 26, 1:21 pm, Michael Bayer mike...@zzzcomputing.com wrote:
It's not wasteful at all in the usual case unless one wants to have leftover
row/table locks
On Mar 26, 2010, at 7:36 PM, keith cascio wrote:
Here is a ping from the real production client against the real
production server:
$ /usr/sbin/ping -s a.bbb..d.com
.
.
a.bbb..d.com PING Statistics
17 packets transmitted, 17 packets received, 0% packet
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