Yeah, I think I explained badly.
What I was trying to show with the sqlalchemy vs postgres query logs
is that extra BEGIN that psycopg2 is sending before the SELECT that
sqlalchemy executes. The BEGIN is implicitly added by psycopg2 because
it's in its default transaction isolation state of read
On Feb 12, 4:25 am, Arnar Birgisson [EMAIL PROTECTED] wrote:
Hi again,
Yes, we thought that might be the case. We tried changing the
isolation level on this connection to snapshot. Now I'm getting
different errors, and more frequent.
One error I get is this:
AttributeError:
Hi,
I'm trying to develop a cross-DB application which works with ORACLE
and MySQL back-ends.
Both DBs has the same schema, but of course there is a caveat. ORACLE
has Tables and Columns in upper case and MySQL does not. That leads to
the following problem. When I construct
select(table.c.column)
Right, delete-orphan is what adds the lifecycle relationship between
parent and child. It means that the child can't exist without a
parent. That lets SA know that it should eliminate the child rather
than trying to null out the relationship.
You probably want all so that all actions performed
Is it possible to examine the session and get a list of all mapped
instances that have been changed?
More details:
I would like to implement an observer pattern in my application. I
would like to let the code make changes to mapped objects as normal,
but immediately before (or after) a session
Hello Friends,
I'm working with the latest version of SQLAlchemy now and I have a
question: how do I determine if a particular mapped object instance
has been populated by the database?
The question originates because I have defined a __repr__() method on
one of my mapped objects. It works
Today, we are pleased to announce the release of Elixir
(http://elixir.ematia.de), a declarative mapper for SQLAlchemy. Elixir
is the successor to ActiveMapper and TurboEntity, and is a collaboration
between Daniel Haus, Jonathan LaCour and Gaëtan de Menten. Elixir's
website provides
I would like some objects that are related through many to many tables
to delete the many to many entry on deletion, but NOT the endpoint. It
seems that cascade=all deletes both, and no arg to cascade leaves left
over invalid entries in the manytomany table. Is there a suggested way
to deal with
See test case:
from turbogears import config
from turbogears.database import metadata
from turbogears import database
from sqlalchemy import Table, Column, Integer, Unicode
import sqlalchemy.orm
config.update({sqlalchemy.dburi:sqlite:///:memory:})
database.bind_meta_data()
Table('t_table',
are these column names using MixedCase ? otherwise you can probably
access them in a case-insensitive fashion (oracle col names are
usually case-insensitive)
On Feb 12, 11:35 am, vkuznet [EMAIL PROTECTED] wrote:
Hi,
I'm trying to develop a cross-DB application which works with ORACLE
and
On Feb 12, 10:30 am, JP [EMAIL PROTECTED] wrote:
But It would be nice to be able to have total control over the
transactional state of the connection, so that when I know that I'm
just doing a select or two I don't have to have the overhead of a
BEGIN that I know is useless, but as things
drop_all() doesnt remove Table instances from the metadata. the Table
object is a python object, it only represents your real database
table. you may well want to call create_all() again using that same
Table.
On Feb 12, 3:20 pm, percious [EMAIL PROTECTED] wrote:
See test case:
from
On Feb 12, 3:00 pm, iain duncan [EMAIL PROTECTED] wrote:
I would like some objects that are related through many to many tables
to delete the many to many entry on deletion, but NOT the endpoint. It
seems that cascade=all deletes both, and no arg to cascade leaves left
over invalid entries
On Feb 12, 3:49 pm, Michael Bayer [EMAIL PROTECTED] wrote:
drop_all() doesnt remove Table instances from the metadata. the Table
object is a python object, it only represents your real database
table. you may well want to call create_all() again using that same
Table.
On Feb 12, 3:20
check for an _instance_key attribute.
On Feb 12, 1:52 pm, Matt Culbreth [EMAIL PROTECTED] wrote:
Hello Friends,
I'm working with the latest version of SQLAlchemy now and I have a
question: how do I determine if a particular mapped object instance
has been populated by the database?
The
not if you understood my previous reply, no.
On Feb 12, 3:55 pm, percious [EMAIL PROTECTED] wrote:
On Feb 12, 3:49 pm, Michael Bayer [EMAIL PROTECTED] wrote:
drop_all() doesnt remove Table instances from the metadata. the Table
object is a python object, it only represents your real
That got it, thanks.
On Feb 12, 3:57 pm, Michael Bayer [EMAIL PROTECTED] wrote:
check for an _instance_key attribute.
On Feb 12, 1:52 pm, Matt Culbreth [EMAIL PROTECTED] wrote:
Hello Friends,
I'm working with the latest version of SQLAlchemy now and I have a
question: how do I
On Feb 12, 3:45 pm, vkuznet [EMAIL PROTECTED] wrote:
No, here is real problem:
schema had the following:
create table Foo (int id);
in MySQL it creates table 'Foo' and column 'id'.
in ORACLE it creates table 'FOO' and column 'ID'
That's create a problem in sqlalchemy, when I access
I looked over the docs but didn't find an answer (so the answer is probably
no). Does SA allow descriptions (database comments) of tables and/or
columns?
Thanks,
Sean
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On Feb 10, 11:48 am, Michael Bayer [EMAIL PROTECTED] wrote:
del p.children[3]
basically cascade has nothing to say about this operation when applied to
transient instances. the history tracking will not see the item as ever
being part of the children collection since you added it then
like the example illustrates, there is no
BEGIN being issued for every SELECT statement when using psycopg2 in
non-autocommit mode, which applies to SQLAlchemy as well. therefore
there is no performance bottleneck; this is a django issue only.
I guess we're reading the example differently.
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