Hi:
I'm new to SQL.
I have to execute the following SQL line, which updates a sequence
number. The table zseq_document_types_lookup has only one record with
this number.
update zseq_document_types_lookup set id=2;
I thought of retrieving the record with something like this:
class Sequence(object):
pass
def someFunction():
db = create_engine( ... )
metadata = BoundMetadata( db )
session = create_session( bind_to = self.db )
table = Table('zseq_document_types_lookup', metadata,
autoload=True)
mapper(Sequence, table)
'Fetch the only record in the table'
sequenceNumber = session.query(Sequence).selectfirst()
'Increment the sequence number'
sequenceNumber.id += 1
session.flush()
BUT, it doesn't work. I get an error "Can't change the identity of
instance sequenceNumber"
My guess is that there is a better way of updating this record...
Thanks in advance!
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