python - sqlalchemy.exc.操作错误 : (OperationalError) unable to open database file None None

Question

我正在运行另一个人的程序，不便之处请向我寻求帮助。该程序是一个网站。服务器端由python和flask(模块，http://flask.pocoo.org/)编写。该程序已在服务器上成功运行。我需要做的是在上面修改一些东西。由于生产服务器不允许测试，我在开发服务器本地通过flask测试了它。但是，我什至无法运行原始程序。以下来自 python。

(venv)kevin@ubuntu:~/python/public_html$ python index.wsgi 

Traceback (most recent call last): File "index.wsgi", line 6, in from app import app as application

File "/home/kevin/python/public_html/app.py", line 27, in <module>
app = create_app()

File "/home/kevin/python/public_html/app.py", line 12, in create_app
database.init_db()

File "/home/kevin/python/public_html/database.py", line 24, in init_db
Base.metadata.create_all(engine)

File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/schema.py", line 2793, in create_all
  tables=tables)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1478, in _run_visitor
with self._optional_conn_ctx_manager(connection) as conn:

File "/usr/lib/python2.7/contextlib.py", line 17, in __enter__
return self.gen.next()

File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1471, in _optional_conn_ctx_manager
with self.contextual_connect() as conn:

File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1661, in contextual_connect
self.pool.connect(),

File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 272, in connect
return _ConnectionFairy(self).checkout()

File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 425, in __init__
rec = self._connection_record = pool._do_get()

File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 857, in _do_get
return self._create_connection()

File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 225, in _create_connection
return _ConnectionRecord(self)

File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 318, in __init__
self.connection = self.__connect()

File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 368, in __connect
connection = self.__pool._creator()

File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/strategies.py", line 80, in connect
return dialect.connect(*cargs, **cparams)

File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/default.py", line 283, in connect
return self.dbapi.connect(*cargs, **cparams)

sqlalchemy.exc.OperationalError: (OperationalError) unable to open database file None None

在config.py文件中

LOGFILE = '/tmp/ate.log' DEBUG = True TESTING = True THREADED = True DATABASE_URI = 'sqlite:////tmp/ate.db' SECRET_KEY = os.urandom(24)

因此，我在我的用户下创建了一个名为“tmp”的文件夹和一个名为“ate.db”的空文件。然后，再次运行它。它说

IOError: [Errno 2] No such file or directory: '/home/kevin/log/ate.log'

然后，我创建了日志文件夹和日志文件。运行它，但没有发生像

(venv)kevin@ubuntu:~/python/public_html$ python index.wsgi (venv)kevin@ubuntu:~/python/public_html$ python index.wsgi (venv)kevin@ubuntu:~/python/public_html$

如果成功，该网站应该在 http://127.0.0.1:5000/上可用。但是，它没有用。有谁知道为什么以及如何解决它？这些代码应该没问题，因为它现在可以在线获得。问题应该是局部问题。非常感谢你的帮助。

程序卡住的代码

from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import scoped_session, sessionmaker

engine = None
db_session = None
Base = declarative_base()


def init_engine(uri, **kwards):
    global engine
    engine = create_engine(uri, **kwards)
    return engine


def init_db():
    global db_session
    db_session = scoped_session(sessionmaker(bind=engine))
    # import all modules here that might define models so that
    # they will be registered properly on the metadata.  Otherwise
    # you will have to import them first before calling init_db()
    import models
    Base.metadata.create_all(engine)

Answer 1

替换:

app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:////dbdir/test.db'

与:

app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///dbdir/test.db'