I have a expenses table with a amount field. I have mapped that table
to a Expense entity object.
How do I sum up all the amounts using my entity object.?
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sqlalchemy
I just wanted to give an update. I have found a solution that works
ok for now but I had to hack a bit. I ended up having to use
psycopg2's ability to override how python classes are converted
to/from a database. psycopg2 seems to have more complete support for
this then SA, so it let me
I have the following columns in some of my select columns:
group_by_column = sqlalchemy.func.sum(column1)
How do I get column1 from the group_by_column object (In other words
is there any way to find out what columns the function is going to be
applied to?). I did a dir(group_by_column) and saw
You don't, it doesn't work that way.
You can map the aggregate as a (SA) property of another class, or make
it a (Python) property/function of the Expense class. Either way
you'll have to create a select object, either for the mapping or a
manual query.
On 2/27/07, Pradeep [EMAIL PROTECTED]
these are all SA bugs/possible inaccuracies in API usage. you should
be able to execute the function as I described below, you should be
able to put the function into an INSERT statement as well. Ill test
these features later today.
On Feb 25, 2007, at 3:43 PM, Allen Bierbaum wrote:
I
Shouldn't SA be able to figure out the following joins without needing the
explicit join params?
I've got to be missing something dumb.
from sqlalchemy import *
metadata = BoundMetaData('sqlite:///:memory:')
ent = Table('entity', metadata,
Column('id', INT,
OK, for the function execution, the syntax that works with release
0.3.5 is:
conn = db.connect()
trans = conn.begin()
conn.execute(func.AddGeometryColumn
('','gis_entity','fpos',-1,'LINESTRING',2).select())
trans.commit()
conn.close()
notice it just adds a select().in changeset 2364, you
On 2/27/07, Rick Morrison [EMAIL PROTECTED] wrote:
Shouldn't SA be able to figure out the following joins without needing the
explicit join params?
no, SA never tries to guess how you want to join things because then
you'd have to add a way to override it when it guesses wrong and it's
simpler
the join() function, given two tables, will make a foreign key join
condition by default if you dont specify the onclause. but if you
arent using a join function somewhere, then nothing else is going
to generate any clauses for you.
On Feb 27, 2007, at 10:50 AM, Rick Morrison wrote:
if you run it with full blown logging on, i.e.:
import logging
logging.basicConfig()
logging.getLogger('sqlalchemy.engine').setLevel(logging.DEBUG)
logging.getLogger('sqlalchemy.orm').setLevel(logging.DEBUG)
the issue can be detected when you look at the mapper creating
instance keys for T
Thanks for taking a peek.
Interesting, it does indeed fix the issue to use labels. Now I have
another issue though, I have a case statement in my select which I was
specifying like this:
select ( ['case when yada yada yada end as something' ] ..
If use_labels = True, then the query
the label is always tablename_columnname. youd have to show me
where you need that to be programmatic.
On Feb 27, 2007, at 2:29 PM, Dennis wrote:
Thanks for taking a peek.
Interesting, it does indeed fix the issue to use labels. Now I have
another issue though, I have a case statement
I am not able to print the object returned by sqlAlchemy in this
instance:
clients=Table('clients',metadata, autoload=True)
s = clients.select(clients.c.client_id==client_id)
#print str(s)
result = s.execute()
client = result.fetchone()
print
Well, columnname isn't a simple column in the case of a case
statement... the label is turning out like this:
casewhenhas_testtrueandscoreisnullandgender1then1whenscoreisnullthen2elsescoreend
I haven't found a way to manually assign a label to a text clause yet,
but before I tried
hallo.
AFAIsee rev 2362 fixes the lazy-load for polymorphic properties.
but is seems to introduce another problem.. or maybe uncover it.
table-inheritance, A-B-C-D, and A has reference to B.
2361: lazy-ref is loaded wrong
...
File /home/az/src/hor-trunk/db/sawrap/tests/sa_gentestbase.py,
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