veekun_pokedex/pokedex/db/__init__.py
Eevee 634ef3ed1e Fixed a slew of foriegn key import problems. #29
Curse's type_id was 0, which is bogus; this has been fixed by creating a
real ????? type.
Fourth-gen moves all had zero as a contest effect id, which was also
bogus.
Pokémon 494 and 495 were junk and have been scrapped entirely.
pokemon_form_groups's description column was too short.

pokedex's connect() now takes kwargs passed to sessionmaker().

A more major change: some tables, like pokemon, are self-referential and
contain rows that refer to rows later in the table (for example, Pikachu
evolves from Pichu, which has a higher id).  At the moment such a row is
loaded, the foreign key is thus bogus.  I solved this by turning on
autocommit and wrapping add() in a try block, then attempting to readd
every failed row again after the rest of the table is finished.  Slows
the import down a bit, but makes it work perfectly with foreign key
checks on.
2009-07-03 23:12:13 -04:00

35 lines
1.1 KiB
Python

from sqlalchemy import MetaData, Table, create_engine, orm
from .tables import metadata
def connect(uri, **kwargs):
"""Connects to the requested URI. Returns a session object.
Calling this function also binds the metadata object to the created engine.
"""
### Do some fixery for MySQL
if uri[0:5] == 'mysql':
# MySQL uses latin1 for connections by default even if the server is
# otherwise oozing with utf8; charset fixes this
if 'charset' not in uri:
uri += '?charset=utf8'
# Tables should be InnoDB, in the event that we're creating them, and
# use UTF-8 goddammit!
for table in metadata.tables.values():
table.kwargs['mysql_engine'] = 'InnoDB'
table.kwargs['mysql_charset'] = 'utf8'
### Connect
engine = create_engine(uri)
conn = engine.connect()
metadata.bind = engine
session_args = dict(autoflush=True, autocommit=False, bind=engine)
session_args.update(kwargs)
sm = orm.sessionmaker(**session_args)
session = orm.scoped_session(sm)
return session