Good Day sqlalchemy.
I was searching, but didn't found a way to delete records from db not
executing selection first.
So, how to represent this SQL statement in slqalchemy ORM :
""" DELETE FROM a WHERE b = c """ ?
not it look like this :
stuff = session.query(A).select_from(a_table).filter(A.c.b==c).first()
session.delete(stuff)
P.S.
How to understand the following :
Traceback (most recent call
last):
File "threading.py", line 442, in
__bootstrap
self.run()
File "./camper.py", line 173, in
run
session.delete(stuff)
File "/usr/lib/python2.4/site-packages/sqlalchemy/orm/scoping.py",
line 74, in
do
return getattr(self.registry(), name)(*args,
**kwargs)
File "/usr/lib/python2.4/site-packages/sqlalchemy/orm/session.py",
line 849, i
n
delete
self._delete_impl(object)
File "/usr/lib/python2.4/site-packages/sqlalchemy/orm/session.py",
line 1007,
in
_delete_impl
raise exceptions.InvalidRequestError("Instance '%s' is not
persisted" % mapp
erutil.instance_str(obj))
InvalidRequestError: Instance '[EMAIL PROTECTED]' is not persisted
It occurs sometimes in threaded application in this code :
"""
from sqlalchemy.orm import mapper, relation, backref, create_session,
scoped_session
session = scoped_session(create_session)
stuff =
session.query(Path).select_from(f_table.join(u_table)).filter(User.c.id==theone.id).first()
session.delete(stuff)
"""
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