Hi,
I have a question regarding multi-threading and transactions in the non-ORM
case.
Assume, we have a global Connection c (with transaction), on which a number
of insert/update queries are executed and some insert/update queries are
executed in threads:
Main thread:
I'd recommend keeping the writes to a single thread if you can as that will
be easiest. If you can't do that then you could tie them together using the
transaction module's two phase commit and zope.sqlalchemy. As you want the
same transaction shared across threads you'll want to create your
Just to give you an idea of the code:
Basically the code scrapes some websites and gets info into objects.
Client class with client info, event class with event info, and so on.
There are foreign keys to tie event and client classes.
Sometimes even when I scrape the web and try to upload
Hi Chris,
Thanks for trying to help.
The code is as follow:
#==
# CompassCandidate()
#==
class CompassCandidate(Base):
'''
The simplest way using your code would be:
for _candidate_data in candidates:
_existing = session.query(CompassCandidate).filter(CompassCandidate.id ==
_candidate_data.id).first()
if not _existing:
# add the new item
session.add(_candidate_data)
else:
# translate the attributes from the new item
This looks to be your problem:
id = Column(String(64), primary_key=True)
`id` is a primary key, which means it must be unique. But you're not
setting it to a unique value. Most people will use a Serial column for
this.
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You received this message because you are subscribed to the
Could you give an example of using a serial column?
I believe that whatever comes into the first argument of column is a
unique value from another DB.
Also, I thought that the person who wrote the code missed to use
relationships between
candidates and jobs.
e.g.:class User(Base):
#
A serial would usually be an integer that is tied to a sequence (postgres,
oracle) or auto_increment (mysql).
I see in your example that you have a unicode string -- `ORaE9+aCdP0`
If that is coming from another db, then you've already migrated that
candidate.
you'll should do a search for
What does the code look like that generates 'candidates'?
Chris
On 17/02/2015 00:48, Javier Pajuelo wrote:
I get the following error:
|
sqlalchemy.exc.IntegrityError: (IntegrityError) column id is not
unique u'INSERT INTO candidates (id, timeStamp, name, link) VALUES
(?, ?, ?, ?)'
