这是我为应用程序设置数据库的方法(在Flask中):
from sqlalchemy.engine import create_engine
from sqlalchemy.orm import scoped_session, create_session
from sqlalchemy.ext.declarative import declarative_base
engine = None
db_session = scoped_session(lambda: create_session(bind=engine,
autoflush=False, autocommit=False, expire_on_commit=True))
Base = declarative_base()
Base.query = db_session.query_property()
def init_engine(uri, **kwargs):
global engine
engine = create_engine(uri, **kwargs)
Base.metadata.create_all(bind=engine)
return engine
如果我连接到已经创建了表的文件数据库,一切正常,但使用 sqlite:///:memory:作为目标数据库会给我:
OperationalError: (OperationalError) no such table: users u'DELETE FROM users' ()
在查询时如此:
UsersTable.query.delete()
db_session.commit()
我从单元测试中访问此代码。有什么问题?
由于
修改
应用程序的工作设置:
app = Flask(__name__)
app.config.from_object(__name__)
app.secret_key = 'XXX'
# presenters
from presenters.users import users
# register modules (presenters)
app.register_module(users)
# initialize the database
init_engine(db)
答案 0 :(得分:3)
您发布的代码不包含任何表/类声明。你确定声明是在调用init_engine()之前完成的吗?