I need to return the ID's of the deleted records on session.query().delete()
I've found this for bulk deletes:
def after_bulk_delete(session, query, query_context, result):
affected_table = query_context.statement.froms[0]
affected_rows = query_context.statement.execute().fetchall()
ah ha! yes!
that is right.
query = select( (these,columns,) ).distinct( this.column )
this was an even tricker problem... and I might have been executing
correct queries last night without realizing it.
i just noticed that i was getting a correct query in my database, while I
was
Assuming you're in the ORM, there's also a per-instance delete :
http://docs.sqlalchemy.org/en/rel_0_8/orm/events.html#sqlalchemy.orm.events.MapperEvents.after_delete
but `session.query().delete()` suggests you don't want to load objects into
the ORM, and just want to delete things matching a
Given the arbitrary example below, I can't ever recall actually using the
FooKeyword association table other than to set up mappings. I came up with
a brute force method to generate the secondary table for me
automatically, and I'm hoping someone can show me a better way to do this.
My goal
The documentation for the Python sqlite driver specifically says:
execute() will only execute a single SQL statement. If you try to execute more
than one statement with it, it will raise a Warning. Use executescript() if you
want to execute multiple SQL statements with one call.
On Sep 22, 2013, at 5:24 PM, jpeck peck.j...@gmail.com wrote:
And replace it with something like this:
class Keyword(Base):
snip (same as before)
class Foo(Base):
snip
keywords = generate_many_to_many_for_me('Foo', 'Keyword')
And replace it with something like this:
class Keyword(Base):
snip (same as before)
class Foo(Base):
snip
keywords = generate_many_to_many_for_me('Foo', 'Keyword')
there's a recipe for this at this blog post, you might consider
So all of the examples i've seen either explicitly pass in a schema or do
it implicitly via the declartive_base. My question is can I create a table
and associate it with a metadata at a later point?
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On Sep 22, 2013, at 10:11 PM, Jeff Peck peck.j...@gmail.com wrote:
And replace it with something like this:
class Keyword(Base):
snip (same as before)
class Foo(Base):
snip
keywords = generate_many_to_many_for_me('Foo', 'Keyword')
this is one of those, why do you want to do that kinds of questions.You
probably have a tometadata() use case of some kind, see
http://docs.sqlalchemy.org/en/rel_0_8/core/metadata.html?highlight=tometadata#sqlalchemy.schema.Table.tometadata
On Sep 22, 2013, at 10:30 PM, Donald Stufft
Mostly I'm trying to avoid global state like metadata. The Tables themselves
are global, but I feel like the metatdata maybe shouldn't be? I'm not a SQL
alchemy expert so maybe what I'm trying to do is crazy and the answer is don't
do that. Mostly I'm trying to figure out what patterns are
Hi Simon -
Great! The executescript from sqlite worked great. I had not seen that. I
was able to execute indices and fks as well.
Is the same not possible from SQLAlchemy then? Would version 0.9 have it? I
don't know if Michael is planning on having this feature.
Meaning even for PostgreSQL
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