vitsin wrote:
> hi,
> can't figure out why raw SQL works fine, but update() is not working:
> 1.working raw SQL:
> self.session.execute("update public.my_table set
> status='L',updated_at=now() where my_name='%s'" % (self.my_name))
>
> 2.non working update() from Alchemy:
> s = aliased(MyTable)
> query = self.session.query(s).filter(s.my_name==self.my_name)
> sts = self.session.execute(query).fetchone()
> sts.update(values={'status':'L'})
>
> sts.update(values={s.status:'L'})
> File "/usr/lib/python2.6/dist-packages/sqlalchemy/engine/base.py",
> line 2097, in _key_fallback
> "Could not locate column in row for column '%s'" % key)
> sqlalchemy.exc.NoSuchColumnError: "Could not locate column in row for
> column 'update'"
>
>
> But Column s.status exists ...
> appreciate any help,
> --vs
In your example, 'sts' represents a single row from the database. These
objects don't have an 'update' method, which is why you are getting that
error. It thinks you are trying to access a column called 'update'
instead.
You appear to be using the SQL Expression language (ie. MyTable is
created using sqlalchemy.Table). You can create an 'update' statement
using MyTable.update(). Examples are at:
http://www.sqlalchemy.org/docs/core/tutorial.html#inserts-and-updates
(You should be able to substitute conn.execute() with session.execute())
However, you might be interested in using the ORM part of SQLAlchemy:
http://www.sqlalchemy.org/docs/orm/tutorial.html
Your usage would then look something like this (assuming MyMappedClass
is the class mapped to MyTable):
s = MyMappedClass
query = self.session.query(s).filter(s.my_name == self.my_name)
sts = query.first()
sts.status = 'L'
self.session.flush()
Hope that helps,
Simon
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