Have you read the tutorial at
http://docs.sqlalchemy.org/en/rel_1_1/orm/tutorial.html#querying-with-joins
and read all the examples at
http://docs.sqlalchemy.org/en/rel_1_1/orm/query.html#sqlalchemy.orm.query.Query.join?
There's nothing odd about the joins you're trying to build here.
You've got the aliased(), you have the and_/or_, and all the conditions.
Just need to move some of those filter() conditions into
query.join(bus1_alias, <onclause>).
On 04/03/2017 04:53 PM, Jason T. wrote:
Okay. I figured out how to use the ORM without joins, but I still can't
figure out how to use the joins. :(
bus1_alias = aliased(sam.Bus)
bus2_alias = aliased(sam.Bus)
branch_db = self.db_hook.session.query(sam.Branch). \
filter(sam.Branch.id_model == sam.Bus.id_model). \
filter(sam.Branch.ckt == ckt). \
filter(sam.Branch.id_model == case.id). \
filter(or_(and_(sam.Branch.id_from_bus == bus1_alias.id,
sam.Branch.id_to_bus == bus2_alias.id),
and_(sam.Branch.id_from_bus == bus1_alias.id,
sam.Branch.id_to_bus == bus2_alias.id))). \
filter(bus1_alias.number == bus1). \
filter(bus2_alias.number == bus2).first()
On Monday, April 3, 2017 at 1:29:49 PM UTC-5, Jason T. wrote:
All,
I am able to join two tables and get the desired result with the
below SQL syntax; however, I am having trouble translating this SQL
to the ORM join syntax. Any help will be appreciated.
SELECT *
FROM raw.branch as b
JOIN raw.bus AS bus1
ON bus1.id = b.id_from_bus
AND bus1.id_model = b.id_model
JOIN raw.bus AS bus2
ON bus2.id = b.id_to_bus
AND bus2.id_model = b.id_model
WHERE b.id_model = 10
AND b.ckt = '1'
AND ((bus1.number = 510417 AND bus2.number = 547486) OR
(bus2.number = 510417 AND bus1.number = 547486))
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