sqlalchemy.engine.strategies MockEngineStrategy Example Code

MockEngineStrategy is a class within the sqlalchemy.engine.strategies module of the SQLAlchemy project.

EngineStrategy is another callable from the sqlalchemy.engine.strategies package with code examples.

Example 1 from alembic

Alembic (project documentation and PyPI page) is a data migrations tool used with SQLAlchemy to make database schema changes. The Alembic project is open sourced under the MIT license.

alembic / alembic / runtime / migration.py

# migration.py
from contextlib import contextmanager
import logging
import sys

from sqlalchemy import Column
from sqlalchemy import literal_column
from sqlalchemy import MetaData
from sqlalchemy import PrimaryKeyConstraint
from sqlalchemy import String
from sqlalchemy import Table
from sqlalchemy.engine import Connection
from sqlalchemy.engine import url as sqla_url
from sqlalchemy.engine.strategies import MockEngineStrategy

from .. import ddl
from .. import util
from ..util import sqla_compat
from ..util.compat import callable
from ..util.compat import EncodedIO

log = logging.getLogger(__name__)


class _ProxyTransaction(object):
    def __init__(self, migration_context):
        self.migration_context = migration_context

    @property
    def _proxied_transaction(self):
        return self.migration_context._transaction

    def rollback(self):
        self._proxied_transaction.rollback()

    def commit(self):
        self._proxied_transaction.commit()



## ... source file continues with no further MockEngineStrategy examples...

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