Hello Michael,
thank you for your answer. You are right that this behavior can be
enforced by setting the viewonly attribute of the relation, and the
others are not needed.
However, I do need to set it on both sides of the relation, or it does
not work. But this not working might be triggered
Hi,
thank you for your help, and the effort at writing a good piece of code.
however, while playing around with, and trying to execute it in PGAdmin, I
stumbled upon some problems
the q = Session().query(Group).join(all_parents, all_parents.c.id==Group.id)
generates a SQL like (I've
I can't figure out how I could adapt the pk_col function on this page
http://www.sqlalchemy.org/trac/wiki/UsageRecipes/NamingConventions to
handle the Sequence definition needed for e.g. Firebird.
At the point when Column is instantiated I don't have access to
table.name and I can't figure it
Hi everyone,
I'm doing some test to evaluate the performance of querying with
sqlalchemy via ORM. I wrote a simple script to measure the execution
time of a simple select query made on relatively small table (300 000
records, 6 columns) in sqlite. Here is the script:
from sqlalchemy import *
On 08/12/2011 02:18 PM, werner wrote:
I can't figure out how I could adapt the pk_col function on this page
http://www.sqlalchemy.org/trac/wiki/UsageRecipes/NamingConventions to
handle the Sequence definition needed for e.g. Firebird.
At the point when Column is instantiated I don't have
On Aug 12, 2011, at 6:00 AM, NiL wrote:
Hi,
thank you for your help, and the effort at writing a good piece of code.
however, while playing around with, and trying to execute it in PGAdmin, I
stumbled upon some problems
the q = Session().query(Group).join(all_parents,
I'm trying to discern a means of creating a .filter(A rel B) where the
values for A, rel and B come from an parameters passed in to the web
page.
I already have an SQLAlchemy statement, say
query = Session.query(table).filter(A==B)
and I want to be able to allow for a drilldown of sorts by the,
On Aug 11, 2011, at 6:45 PM, neurino wrote:
Sorry if I bother again but adding some others relationships like this
spanning on 5 tables:
mapper(UserLayer, inherits=base_user_layer_mapper,
polymorphic_identity=CLASS_LAYER,
properties={
...
On Aug 12, 2011, at 10:21 AM, RVince wrote:
I'm trying to discern a means of creating a .filter(A rel B) where the
values for A, rel and B come from an parameters passed in to the web
page.
I already have an SQLAlchemy statement, say
query = Session.query(table).filter(A==B)
and I want
Here's a comparison that begins to be slightly fair regarding the work of
fetching raw rows versus generating and identity-managing full object rows.
On my mac the SQL query takes 7 seconds and the Session query 13.7, so
twice as slow, rather than 20. The difference is we are actually
hi again,
after playing a while with PG, here is a SQL statement that outputs the
expected result
SELECT groups_recursive.id AS groups_recursive_id, groups_recursive.name AS
groups_recursive_name, groups_recursive.display_name AS
groups_recursive_display_name
FROM groups_recursive JOIN (WITH
On Aug 12, 2011, at 9:04 AM, werner wrote:
On 08/12/2011 02:18 PM, werner wrote:
I can't figure out how I could adapt the pk_col function on this page
http://www.sqlalchemy.org/trac/wiki/UsageRecipes/NamingConventions to handle
the Sequence definition needed for e.g. Firebird.
At the
sure, couple of small adjustments, attached
On Aug 12, 2011, at 10:44 AM, NiL wrote:
hi again,
after playing a while with PG, here is a SQL statement that outputs the
expected result
SELECT groups_recursive.id AS groups_recursive_id, groups_recursive.name AS
groups_recursive_name,
On 08/12/2011 04:46 PM, Michael Bayer wrote:
On Aug 12, 2011, at 9:04 AM, werner wrote:
On 08/12/2011 02:18 PM, werner wrote:
I can't figure out how I could adapt the pk_col function on this page
http://www.sqlalchemy.org/trac/wiki/UsageRecipes/NamingConventions to handle
the Sequence
thank you so much Michael !! much better
few last things are
WITH RECURSIVE all_parents(id, rank) AS
SELECT groups_recursive.id, 1
FROM groups_recursive, groups_recursive_parents__groups_recursive_children
quotes around the 1, this leads to ERROR: column 1 does not exist
+
the param
Mark, yes, in part. What I cannot figure out -- and am not sure this
is possible with SQLAlchemy, is to go from strings, as returned from
HTTP Post's, representing the fields in the table (for the left side
of the relation) to the actual statemetn itself. In other words, if
the HTTP post calls for
say you want to filter on the 'field' (field would be a string representing
the name of the field) on objects of class == Klass
field_attr = getattr(Klass, field)
would give you the instrumented attribute
then
Session.query(Klass).filter(field_attr == searchString)
or
On Aug 12, 2011, at 11:52 AM, NiL wrote:
say you want to filter on the 'field' (field would be a string representing
the name of the field) on objects of class == Klass
field_attr = getattr(Klass, field)
would give you the instrumented attribute
then
On 08/12/2011 05:52 PM, NiL wrote:
say you want to filter on the 'field' (field would be a string
representing the name of the field) on objects of class == Klass
field_attr = getattr(Klass, field)
would give you the instrumented attribute
then
Session.query(Klass).filter(field_attr ==
its at the point where you should be able to tweak it using documented
processes. column() applies quotes for example, whereas literal_column(1)
would not. Same for an expression x + 1 will turn the 1 into a bind, would
not if you again use literal_column()
Dear All,
I have a list of elements for which I need to establish if they are in
a tadabase. I can make for each element a separate query but I am
afraid that that is not the best approach what is the best practice in
this case?
Thanks
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yes, many thanks
I now have a method in my Group class (still in elixir syntax)
def hierarchy_ng(self):
with CommonTableExpression.create(
all_parents, [id, rank]) as all_parents:
rank = literal_column(rank)
groups = Group.table
groups_assoc =
Wickert, can you give me an example ? I'm a little confused by this
posts of yours. RVince
On Aug 12, 12:20 pm, Wichert Akkerman wich...@wiggy.net wrote:
On 08/12/2011 05:52 PM, NiL wrote:
say you want to filter on the 'field' (field would be a string
representing the name of the field)
Thanks to all you guys. Really. I didn't think I would be able to do
this! RVince
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Dear all,
I am trying to limit group_by function only on the rows that satisfy
certain query
if I use group_by(table.c.something) this pertains to whole table.
I tried to use elements of the tuple rendered as a result of a query
as arguments (as it has been suggested on this forum) but it did not
Dear all,
How can I determine the number of objects (the memory capacity) that a
session can take? How can I determine the size of an object?
Thanks
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On 12.08.11 09:41, Eduardo wrote:
Dear All,
I have a list of elements for which I need to establish if they are in
a tadabase. I can make for each element a separate query but I am
afraid that that is not the best approach what is the best practice in
this case?
Thanks
Depending on the
can you please illustrate a simple SQL statement that illustrates what you are
trying to achieve ?
On Aug 12, 2011, at 1:00 PM, Eduardo wrote:
Dear all,
I am trying to limit group_by function only on the rows that satisfy
certain query
if I use group_by(table.c.something) this pertains
I'm not familiar with any method for doing that, and it depends mostly on how
much data each of your objects contains - the Session/ORM will have a small
amount of memory overhead beyond that which is of a fixed size.
At best I'd say you can estimate the memory size per object by running a
Is there a way to access the parameters to the Column() call used to set up a
database table when given either an instance field or class field?
For example:
class MyClass(Base):
...
f1 = Column(Integer, nullable=False, info={'min':0})
...
If I have MyClass.f1 or
On Aug 12, 2011, at 5:05 PM, Mark Erbaugh wrote:
Is there a way to access the parameters to the Column() call used to set up a
database table when given either an instance field or class field?
For example:
class MyClass(Base):
...
f1 = Column(Integer, nullable=False,
On Aug 12, 2011, at 5:26 PM, Michael Bayer wrote:
Is there a way to access the parameters to the Column() call used to set up
a database table when given either an instance field or class field?
For example:
class MyClass(Base):
...
f1 = Column(Integer, nullable=False,
I'm trying to do something like this in sqlalchemy:
select (score/10)*10 || '-' || (score/10)*10+9 as scorerange,
count(*)from scoresgroup by score/10 order by 1
which should give:
scorerange | count
+---
0-9|11
10-19 |14
20-29 | 3
30-39 | 2
On Aug 12, 2011, at 6:43 PM, nospam wrote:
I'm trying to do something like this in sqlalchemy:
select (score/10)*10 || '-' || (score/10)*10+9 as scorerange,
count(*)from scoresgroup by score/10 order by 1
which should give:
scorerange | count
+---
0-9|11
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