env

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.

Source code in lineapy/_alembic/env.py

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") or options.database_url
    context.configure(
        url=url,
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
    )

    with context.begin_transaction():
        context.run_migrations()

run_migrations_online()

Run migrations in 'online' mode.

In this scenario we need to create an Engine and associate a connection with the context.

Source code in lineapy/_alembic/env.py

def run_migrations_online() -> None:
    """Run migrations in 'online' mode.

    In this scenario we need to create an Engine
    and associate a connection with the context.

    """
    ini_config = config.get_section(config.config_ini_section)
    if ini_config.get("sqlalchemy.url", None) is None:
        ini_config["sqlalchemy.url"] = options.database_url

    connectable = engine_from_config(
        ini_config,
        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()

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