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alembic.ini
INI
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# A generic, single database configuration.
[application]
config_file_name = app_conf.py
 
[alembic]
# path to migration scripts
script_location = foo.bar:migrations
 
# template used to generate migration files
# file_template = %%(rev)s_%%(slug)s
 
# set to 'true' to run the environment during
# the 'revision' command, regardless of autogenerate
# revision_environment = false
 
# Logging configuration
[loggers]
keys = root,sqlalchemy,alembic
 
[handlers]
keys = console
 
[formatters]
keys = generic
 
[logger_root]
level = WARN
handlers = console
qualname =
 
[logger_sqlalchemy]
level = WARN
handlers =
qualname = sqlalchemy.engine
 
[logger_alembic]
level = INFO
handlers =
qualname = alembic
 
[handler_console]
class = StreamHandler
args = (sys.stderr,)
level = NOTSET
formatter = generic
 
[formatter_generic]
format = %(levelname)-5.5s [%(name)s] %(message)s
datefmt = %H:%M:%S
env.py
Python
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from __future__ import with_statement
import os.path
from alembic import context
from sqlalchemy import engine_from_config, pool
from logging.config import fileConfig
 
from foo.bar.database import db
from foo.bar.core import create_app
 
# this is the Alembic Config object, which provides
# access to the values within the .ini file in use.
config = context.config
 
app = create_app(config.get_section_option('application', 'config_file_name'))
config.set_main_option('sqlalchemy.url', app.config['SQLALCHEMY_DATABASE_URI'])
 
# Interpret the config file for Python logging.
# This line sets up loggers basically.
fileConfig(config.config_file_name)
 
# add your model's MetaData object here
# for 'autogenerate' support
# from myapp import mymodel
# target_metadata = mymodel.Base.metadata
# target_metadata = None
target_metadata = db.metadata
 
# other values from the config, defined by the needs of env.py,
# can be acquired:
# my_important_option = config.get_main_option("my_important_option")
# ... etc.
 
 
def run_migrations_offline():
"""Run migrations in 'offline' mode.
 
This configures the context with just a URL
and not an Engine, though an Engine is acceptable
here as well. By skipping the Engine creation
we don't even need a DBAPI to be available.
 
Calls to context.execute() here emit the given string to the
script output.
 
"""
url = config.get_main_option("sqlalchemy.url")
context.configure(url=url)
 
with context.begin_transaction():
context.run_migrations()
 
 
def run_migrations_online():
"""Run migrations in 'online' mode.
 
In this scenario we need to create an Engine
and associate a connection with the context.
 
"""
engine = engine_from_config(
config.get_section(config.config_ini_section),
prefix='sqlalchemy.',
poolclass=pool.NullPool)
 
connection = engine.connect()
context.configure(
connection=connection,
target_metadata=target_metadata
)
 
try:
with context.begin_transaction():
context.run_migrations()
finally:
connection.close()
 
if context.is_offline_mode():
run_migrations_offline()
else:
run_migrations_online()

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