Question

我遇到了alembic的stamp命令和使用sqlite内存数据库进行测试的一些问题。与基于文件的sqlite dbs完美配合的测试因OperationalError: (OperationalError) no such table而失败。

我在初始化期间加盖标记以显示数据库是最新的：

def init_db(engine, version):
    tables.Base.metadata.create_all(engine)
    with engine.begin() as connection:
        stamp_alembic(connection)

def stamp_alembic(connection):
    from alembic import command
    from alembic.config import Config

    alembic_cfg = Config('alembic.ini')
    alembic_cfg.attributes['connection'] = connection
    command.stamp(alembic_cfg, 'head')

我正在将当前连接传递给env.py as per the cookbook：

def run_migrations_online():
    connectable = config.attributes.get('connection', None)
    if connectable is None:
        # only create Engine if we don't have a Connection
        # from the outside
        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()

我的测试班：

SETTINGS = {'sqlalchemy.url': 'sqlite:///:memory:'}

class TestOperatorUserModel(unittest.TestCase):
    def setUp(self):
        engine = engine_from_config(SETTINGS, 'sqlalchemy.')
        tables.DBSession.configure(bind=engine)
        init_db(engine, SETTINGS['version.db'])
        transaction.begin()

    def tearDown(self):
        engine = engine_from_config(SETTINGS, 'sqlalchemy.')
        transaction.abort()
        tables.Base.metadata.drop_all(engine)
        tables.DBSession.remove()

如果我从初始化中删除了戳记，那么测试也可以正常运行。作为一种解决方法，如果engine.url.database不是':memory:'，我只会标记数据库，但我想知道问题的真正来源是什么。

环境是Python 2.7.11，SQLAlchemy 0.9.10，alembic 0.8.6和sqlite 2.8.17。

使用sqlite内存数据库

0 个答案: