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- from __future__ import with_statement
- from alembic import context
- from sqlalchemy import engine_from_config, pool
- from logging.config import fileConfig
- # this is the Alembic Config object, which provides
- # access to the values within the .ini file in use.
- config = context.config
- # 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
- # 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, target_metadata=target_metadata, literal_binds=True)
- 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.
- """
- connectable = engine_from_config(
- config.get_section(config.config_ini_section),
- prefix='sqlalchemy.',
- poolclass=pool.NullPool)
- with connectable.connect() as connection:
- context.configure(
- connection=connection,
- target_metadata=target_metadata
- )
- with context.begin_transaction():
- context.run_migrations()
- if context.is_offline_mode():
- run_migrations_offline()
- else:
- run_migrations_online()
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