I'm currently reflecting a few tables from a MSSQL database and then
creating the table structure over to Postgres. I'm using sqlalchemy 0.9 and
python 2.7.
So far I've been very successful doing this with most of the tables except
on a few tables I've received a 'sqlalchemy.exc.CircularDependencyError:
Circular dependency detected.'
I've done some research and it looks like I'll need to do a
'use_alter=True', however, I'm not defining any or foreign keys those are
being picked up by the reflection process.
How would I add this parameter to my 'create_all()' statement. I've
included the basic logic below.
def make_session(connection_string):
engine = create_engine(connection_string, echo=True, convert_unicode=True)
Session = sessionmaker(bind=engine)
return Session(), engine
sengine = 'mssql+pyodbc://User:Password@sourcedb'
dengine = 'mssql+pyodbc://User:Password@destinationdb'
source, engine = make_session(sengine)
smeta = MetaData(bind=sengine)
destination, dengine = make_session(dengine)
table_name = 'SomeTable'
#Load the table
table = Table(table_name, smeta, autoload=True)
#Create table at new destination
table.metadata.create_all(dengine)
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