On May 27, 2007, at 4:23 PM, SamDonaldson wrote:
>
> How do I look to see what sql is being constructed in the query
> object? So if I have something like:
>
> q = query.session(User)
> q = q.add_column(....)
> q = q.group_by(.....).select()
>
> How do I check what sql string has been constructed in q?
the Select object is returned by query.compile(). but also you can
just enable logging of 'sqlalchemy.engine' or use echo=True on
create_engine() which may be more expedient.
>
> Also, say I want to do a group by a particular column name on the User
> table and I have two aggregates, sum, and count? How do I add these
> two columns to q? Do I just call add_column twice? It's not working,
> I'm getting an empty result set.
>
> q = query.session(User)
> q = q.add_column(func.sum(User.c.id).label('sum'))
> q = q.add_column(func.count(User.c.id).label('count'))
> q = q.group_by([User.c.blah]).select()
>
> I'm getting an empty result set. What exactly does label do here?
its going to use the "AS" keyword to apply a column label, such as:
select users.id as users_id, users.name as users_name, sum(users.id)
as sum, count(users.id) as count
FROM users GROUP BY users.blah
take a look what its generating and play around with the resulting
SQL manually to get an idea about what will return results.
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