Hi ,
I am testing sqlalchemy-migrate with a DB revision script that adds a
table to my database. Two questions here, but first system info:
TG2 Framework (tg.devtools 2.0.2) with
sqlalchemy_migrate-0.5.2-py2.6.egg
MySQL 5.1.41
sqlalchemy V0.5.1
OS X 10.6.4
1) How do I use DeclarativeBase when defining my tables in migrate
scripts? I Googled this and saw nothing in the manual. Is it
possible?
This works fine:
test_case = Table ('test_case', meta,
Column ('id', Integer, primary_key=True),
Column('name', Unicode(255), nullable=False),
mysql_engine='InnoDB'
)
def upgrade():
test_case.create()
But do I do this? Part of the problem is that I don't know of a way
to generate tables other than create_all() (or drop_all()) when using
declarative syntax. Is there another way?
mysql_engine_type = InnoDB
class TestCase (DeclarativeBase):
__tablename__='test_case'
__table_args__ = {'mysql_engine':mysql_engine_type}
id = Column (Integer, primary_key=True)
name = Column (Unicode(255), nullable=False)
def __init__(self, name):
self.name = name
def upgrade():
???
2) Can MySQL wrap Table.create() in a transaction so that if something
fails during upgrade/downgrade I don't litter up my DB with tables? I
don't think MySQL can, but maybe I am wrong. I think some others
(PostgreSQL) can.
def upgrade():
connection = migrate_engine.connect()
transaction = connection.begin()
try:
test_case.create(bind=connection) # Always seems to happen, even
during rollback
w1 = WeightCode('testw1')
w2 = WeightCode('testw2')
session.add(w1) # Doesn't insert on rollback
session.add(w2) # Doesn't insert on rollback
session.add(w3) # Fail
transaction.commit()
except:
print "UPGRADE FAILURE, ROLLING BACK"
transaction.rollback()
I like the idea behind migrate, but have been using DeclarativeBase
throughout my application. Having to switch between the Table/mapper
& Base syntax is a bit awkward, so I am hoping there is a more direct,
all DeclarativeBase way of doing things.
Thanks for the help,
Shane
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