i went for polymorphic asociation on my multiple inheritances /
multiple aspects. it gives even more freedom than what strict
inheritance needs.
the examples around ruby-on-rails are for one2many/many2one:
http://wiki.rubyonrails.org/rails/pages/UnderstandingPolymorphicAssociations
put a class ABC(object): pass
and see what it gets filled with?
On Thursday 04 September 2008 00:10:44 Mike wrote:
On Sep 3, 3:45 pm, Michael Bayer [EMAIL PROTECTED] wrote:
On Sep 3, 2008, at 4:14 PM, Mike wrote:
Replying to my own message seems kind of schizo, but I found
one solution.
see (single) table inheritance and the rest,
http://www.sqlalchemy.org/docs/05/mappers.html#advdatamapping_mapper_inheritance
On Wednesday 03 September 2008 21:59:28 [EMAIL PROTECTED] wrote:
Hi all,
I just started playing with SQLAlchemy today (after several years
of plain SQL experience)
and here is the new traceback ;-)
Traceback (most recent call last):
File foo.py, line 38, in module
DBSession.flush()
File /Users/michael/programming/rumdemo3/lib/python2.5/site-
packages/SQLAlchemy-0.5.0beta3-py2.5.egg/sqlalchemy/orm/scoping.py,
line 106, in do
return
Thanks for the quick answers. But I'm left with some side-effect I'm a
little bit struggling with: in order for this to work myObject and
myOtherObject need to inherit some base class let's say 'entity'. Now
the ones who created the database clearly didn't had much experience
with databases (damn
AFAIK for the single inh. your object hierarchy makes no difference -
it all goes in one table, regardless if it is one class of whole tree
of not-realy-related-ones. what is the python side of things is up to
you. why is that entity base class bothering you? declare it just
inheriting object
Well let me be more concrete, I'll show you part of the mess I'm in:
We have persons, called contacts, and departments. For some crazy
reason the previous designers put them all in one table (called
'contacts' can you believe this?!). Now they share almost nothing but
a name. There all kinds of
thats still not much of a mess, at least u have 5 tables and not 500.
see, i've never used single table inh, and i'm not sql fan at all -
thats why i made dbcook.sf.net - but maybe it looks like:
entity_table = Table('contacts', metadata,
Column('id', Integer, primary_key=True),
Thanks for the response. I will read into the docs a little bit more
and let you know what I came up with...
On Thu, Sep 4, 2008 at 11:32 AM, [EMAIL PROTECTED] wrote:
thats still not much of a mess, at least u have 5 tables and not 500.
see, i've never used single table inh, and i'm not sql
Is there a simple way of comparing tuples in the SQLAlchemy query
language, like (User.last_name, User.first_name) ('Joe', 'Doe')?
SQL-wise it is possible (at least with PostgreSQL), but you cannot write
this as a filter expression.
-- Christoph
On Sep 3, 2008, at 11:25 PM, Michael Bayer wrote:
This pattern doesnt entirely make sense - the citizen_type and
employee_type columns seem superfluous and redundant against each
other, since we really can't load Engineer rows without querying all
three tables. In that sense it takes on
On Sep 4, 2008, at 4:15 AM, Michael Brickenstein wrote:
AssertionError: Dependency rule tried to blank-out primary key column
'project_programming_language.programming_language_id' on instance
'[EMAIL PROTECTED]'
the project_programming_language table's primary key is
On Sep 4, 2008, at 1:39 AM, gniquil wrote:
documented. The sqlalchemy expression language can't really do very
well here either (at least too proprietary in some ways...sort of like
working with pylons versus working with a CMS like Plone, which both
can be used to create a blog, but one
Is there a simple way of comparing tuples in the SQLAlchemy query
language, like (User.last_name, User.first_name) ('Joe', 'Doe')?
SQL-wise it is possible (at least with PostgreSQL), but you cannot write
this as a filter expression.
Tried the following, but it does not work:
print
On Thursday 04 September 2008 15:42:56 Michael Bayer wrote:
On Sep 4, 2008, at 12:40 AM, gniquil wrote:
Hi All,
I am doing some work with xmlrpc. One thing I realize is that
whenever I pass dict(row) through xmlrpc, I get an key-ordered
struct. But this isn't what i really want. What I
Dear Michael!
Thanks, I got it and understand the difference now.
Thank you very much for your help and your
time.
Michael
Am 04.09.2008 um 14:35 schrieb Michael Bayer:
On Sep 4, 2008, at 4:15 AM, Michael Brickenstein wrote:
AssertionError: Dependency rule tried to blank-out primary key
This does not work either:
print session.query(User).filter(
text((last_name, first_name) (%(last_name)s, %(first_name)s),
)).params(first_name='Joe', last_name='Doe').all()
Running out of ideas...
-- Christoph
--~--~-~--~~~---~--~~
You received this
just use the plain string and not text(), and use :paramname as the
bind param format. example is here:
http://www.sqlalchemy.org/docs/05/ormtutorial.html#datamapping_querying_using
On Sep 4, 2008, at 9:25 AM, Christoph Zwerschke wrote:
This does not work either:
print
Michael Bayer wrote:
On Sep 4, 2008, at 12:40 AM, gniquil wrote:
Hi All,
I am doing some work with xmlrpc. One thing I realize is that whenever
I pass dict(row) through xmlrpc, I get an key-ordered struct. But this
isn't what i really want. What I want is ordered by insertion or the
Michael Bayer schrieb:
just use the plain string and not text(), and use :paramname as the
bind param format. example is here:
http://www.sqlalchemy.org/docs/05/ormtutorial.html#datamapping_querying_using
Excellent, that works:
print session.query(User).filter(
(last_name,
On Thursday 04 September 2008 17:51:56 Michael Bayer wrote:
On Sep 4, 2008, at 9:03 AM, [EMAIL PROTECTED] wrote:
i used to set sqlalchemy.util.Set to be
sqlalchemy.util.OrderedSet and that worked well...
if all those basic things (dict, set, odict, oset, etc) are
always routed via
On Sep 3, 2008, at 4:25 PM, Lukasz Szybalski wrote:
Hello,
I was wondering if there are any plans to have a csv engine for
sqlalchemy. I would like to see support for csv. There are some cases
where csv is the best way to convert data to and from especially when
they require cleaning.
Michael,
Thanks for the thoughtful replies. I'm going to explore the options
you raised here. I'll post back with any insights I come to.
Best,
Sam
--~--~-~--~~~---~--~~
You received this message because you are subscribed to the Google Groups
sqlalchemy group.
On Sep 3, 8:25 pm, Michael Bayer [EMAIL PROTECTED] wrote:
You can certainly map to any of the hierarchies indicated in that
article, but you wouldn't be able to take advantage of SQLA's
polymorphic capabilities, which are designed to only handle single
inheritance. You'd really want
sorry for the rant. my second response is closer to the mark.
On Sep 4, 2008, at 2:01 PM, Sam Magister wrote:
Michael,
Thanks for the thoughtful replies. I'm going to explore the options
you raised here. I'll post back with any insights I come to.
Best,
Sam
On Sep 4, 2008, at 2:12 PM, Sam Magister wrote:
Michael, what would the mapper function look like if it were to map
Engineer(Employee, Citizen) to
engineers.join(citizens).join(employees). What argument of the mapper
would that join condition be in? I think concrete inheritance might be
Hi,
I am trying to translate the following SQL into SqlAlchemy session
syntax:
sql = ''' SELECT SUM(reg), SUM(ot), SUM(ce), SUM(hol), SUM(sklv),
SUM(vac), SUM(ct), SUM(conv), SUM(misc)
FROM tbl_TimeEntries
WHERE dateworked = '%s' AND dateworked = '%s' AND empid
= %s
On Sep 4, 2008, at 3:14 PM, Mike wrote:
Hi,
I am trying to translate the following SQL into SqlAlchemy session
syntax:
sql = ''' SELECT SUM(reg), SUM(ot), SUM(ce), SUM(hol), SUM(sklv),
SUM(vac), SUM(ct), SUM(conv), SUM(misc)
FROM tbl_TimeEntries
WHERE dateworked
Hi,
On Sep 4, 2:32 pm, Michael Bayer [EMAIL PROTECTED] wrote:
On Sep 4, 2008, at 3:14 PM, Mike wrote:
Hi,
I am trying to translate the following SQL into SqlAlchemy session
syntax:
sql = ''' SELECT SUM(reg), SUM(ot), SUM(ce), SUM(hol), SUM(sklv),
SUM(vac), SUM(ct), SUM(conv),
I'm using 0.4.6 but I thought I'd give 0.5b3 a try.
An existing (working) query failed with:
Query.__no_criterion() being called on a Query with existing
criterion.
I tracked that down to using order_by when building the query.
An example is below:
q = dbsess.query(Obj)
q =
On Sep 4, 2008, at 4:17 PM, Jon wrote:
I'm using 0.4.6 but I thought I'd give 0.5b3 a try.
An existing (working) query failed with:
Query.__no_criterion() being called on a Query with existing
criterion.
I tracked that down to using order_by when building the query.
An example is
On Sep 4, 2008, at 4:32 PM, Michael Bayer wrote:
On Sep 4, 2008, at 4:17 PM, Jon wrote:
I'm using 0.4.6 but I thought I'd give 0.5b3 a try.
An existing (working) query failed with:
Query.__no_criterion() being called on a Query with existing
criterion.
I tracked that down to using
On Sep 4, 3:32 pm, Michael Bayer [EMAIL PROTECTED] wrote:
On Sep 4, 2008, at 4:17 PM, Jon wrote:
I'm using 0.4.6 but I thought I'd give 0.5b3 a try.
An existing (working) query failed with:
Query.__no_criterion() being called on a Query with existing
criterion.
I tracked that
On Sep 4, 4:33 pm, Jon [EMAIL PROTECTED] wrote:
On Sep 4, 3:32 pm, Michael Bayer [EMAIL PROTECTED] wrote:
On Sep 4, 2008, at 4:17 PM, Jon wrote:
I'm using 0.4.6 but I thought I'd give 0.5b3 a try.
An existing (working) query failed with:
Query.__no_criterion() being called on
I'm setting up my first project that will use SA exclusively for
database access and I've run into some behavior that seems odd to me.
If I insert u into a column that is defined as nvarchar then when I
select that column, I receive u . So I'm receiving a unicode string
containing one space
Almost forgot: I'm working against SQL Server 2000.
--~--~-~--~~~---~--~~
You received this message because you are subscribed to the Google Groups
sqlalchemy group.
To post to this group, send email to sqlalchemy@googlegroups.com
To unsubscribe from this group,
On Sep 4, 2008, at 5:33 PM, Jon wrote:
I'll note that if I use something like this in the ORM mapper
definition:
order_by=meta.tables['some_table'].c.some_column,
get(pkey) continues to work *and* ORDER BY is used in the SQL.
While ORDER BY doesn't make sense when acquiring just
On Sep 4, 5:31 pm, Michael Bayer [EMAIL PROTECTED] wrote:
On Sep 4, 2008, at 5:33 PM, Jon wrote:
I'll note that if I use something like this in the ORM mapper
definition:
order_by=meta.tables['some_table'].c.some_column,
get(pkey) continues to work *and* ORDER BY is used in the
On Sep 4, 2008, at 5:55 PM, Jon wrote:
I'll note that I find building a single query for potentially several
uses quite handy, whether I'm doing a get() or an additional filter/
filter_by. By prebuilding as much of the query as possible I reduce
the overall complexity of my applications,
On Sep 4, 2008, at 6:38 PM, Jon wrote:
I'd still like to request that order by be allowed - there is a big
difference between makes no sense and is an error.
At the moment I'm pretty convinced that allowing makes no sense to
pass through silently is poor behavior.
as usual, since this one might turn out to be pretty controversial, I
welcome the list to comment on this one. The order_by().get() idea
does fall in the category of nonsensical as opposed to ambiguous ,
perhaps thats the distinction we'd want to go on.
On Sep 4, 5:54 pm, Michael Bayer [EMAIL PROTECTED] wrote:
as usual, since this one might turn out to be pretty controversial, I
welcome the list to comment on this one. The order_by().get() idea
does fall in the category of nonsensical as opposed to ambiguous ,
perhaps thats the
I woke up today and decided it was time to switch one of my simpler
programs from sqlobject to sqlalchemy.
I'm using reflection. After some googling I was able to find a way
to insert:
mp = mphones.insert().execute(word=word, mphone=phone)
The above works okay.
But I'd rather be able to do
On Sep 4, 2008, at 7:19 PM, Jon wrote:
In your specific case, I don't see what's so hard about creating a
Query which has *only* those aspects which make sense both to a get()
as well as a join()/order_by() combination (in this case the
eagerload
options), and passing that to further
On Sep 4, 2008, at 7:16 PM, Sam wrote:
I woke up today and decided it was time to switch one of my simpler
programs from sqlobject to sqlalchemy.
I'm using reflection. After some googling I was able to find a way
to insert:
mp = mphones.insert().execute(word=word, mphone=phone)
The
When the database is to support sql 2005
--~--~-~--~~~---~--~~
You received this message because you are subscribed to the Google Groups
sqlalchemy group.
To post to this group, send email to sqlalchemy@googlegroups.com
To unsubscribe from this group, send email
On Sep 4, 7:01 pm, Michael Bayer [EMAIL PROTECTED] wrote:
In this case it means a doubling of the number of queries I already
have, and those queries are indexed by name. Since the queries
(sometimes fairly complex) would be almost exactly the same it would
actually make things much
Michael...
I've read the tutorial, and I think I understand it.
But maybe I don't understand reflection. I thought that I could use
it to avoid defining anything. I'd like to have objects basically
spring into life knowing exactly what their row names are, without
having to type anything.
Am
*PLEASE LET ME KNOW IF YOU HAVE ANY JAVA DEVELOPERS WITH MARKET DATA EXP AT
NY*
LOCATION : NY
DURATION : 1 YEAR
*1) **We are looking for a senior Java, J2EE developer to join business
focused Prime Brokerage Technology team*.
*Role is to do development, building the trade capture application,
49 matches
Mail list logo
