import asyncio from logging.config import fileConfig from sqlalchemy import pool from sqlalchemy.engine import Connection from sqlalchemy.ext.asyncio import async_engine_from_config from alembic import context # 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. if config.config_file_name is not None: 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() -> None: """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, dialect_opts={"paramstyle": "named"}, ) with context.begin_transaction(): context.run_migrations() def do_run_migrations(connection: Connection) -> None: context.configure(connection=connection, target_metadata=target_metadata) with context.begin_transaction(): context.run_migrations() async def run_async_migrations() -> None: """In this scenario we need to create an Engine and associate a connection with the context. """ connectable = async_engine_from_config( config.get_section(config.config_ini_section, {}), prefix="sqlalchemy.", poolclass=pool.NullPool, ) async with connectable.connect() as connection: await connection.run_sync(do_run_migrations) await connectable.dispose() def run_migrations_online() -> None: """Run migrations in 'online' mode.""" asyncio.run(run_async_migrations()) if context.is_offline_mode(): run_migrations_offline() else: run_migrations_online()