异步 SQLAlchemy 无法创建引擎

Question

我制作了一个小应用程序，用于SQLAlchemy处理与 postgresql 数据库的连接。现在我想用asincio重写它。由于某种原因，当我运行它时，出现以下错误：

Traceback (most recent call last):
  File "D:\Space\discord_count_bot\bot\bot\main.py", line 12, in <module>
    dbConnection.init_connection(
  File "D:\Space\discord_count_bot\bot\bot\db_hanler.py", line 78, in init_connection
    engine = create_async_engine(connection_string, future=True, echo=True)
  File "D:\Space\discord_count_bot\bot_env\lib\site-packages\sqlalchemy\ext\asyncio\engine.py", line 40, in create_async_engine
    sync_engine = _create_engine(*arg, **kw)
  File "<string>", line 2, in create_engine
  File "D:\Space\discord_count_bot\bot_env\lib\site-packages\sqlalchemy\util\deprecations.py", line 298, in warned
    return fn(*args, **kwargs)
  File "D:\Space\discord_count_bot\bot_env\lib\site-packages\sqlalchemy\engine\create.py", line 560, in create_engine
    dbapi = dialect_cls.dbapi(**dbapi_args)
  File "D:\Space\discord_count_bot\bot_env\lib\site-packages\sqlalchemy\dialects\postgresql\psycopg2.py", line 782, in dbapi
    import psycopg2
ModuleNotFoundError: No module named 'psycopg2'

如果psycopg2安装了，我得到

Traceback (most recent call last):
  File "D:\Space\discord_count_bot\bot\bot\main.py", line 12, in <module>
    dbConnection.init_connection(
  File "D:\Space\discord_count_bot\bot\bot\db_hanler.py", line 78, in init_connection
    engine = create_async_engine(connection_string, future=True, echo=True)
  File "D:\Space\discord_count_bot\bot_env\lib\site-packages\sqlalchemy\ext\asyncio\engine.py", line 41, in create_async_engine
    return AsyncEngine(sync_engine)
  File "D:\Space\discord_count_bot\bot_env\lib\site-packages\sqlalchemy\ext\asyncio\engine.py", line 598, in __init__
    raise exc.InvalidRequestError(
sqlalchemy.exc.InvalidRequestError: The asyncio extension requires an async driver to be used. The loaded 'psycopg2' is not async. 

我想我已经asyncpg安装了，我需要特别告诉我SQLAlchemy如何使用它。或者也许，我的代码中有一些东西，让我SQLAlchemy思考，它应该使用psycopg2...我找不到任何关于它的东西，在我遇到的每个教程中，一切似乎都工作得很好。

Traceback (most recent call last):
  File "D:\Space\discord_count_bot\bot\bot\main.py", line 12, in <module>
    dbConnection.init_connection(
  File "D:\Space\discord_count_bot\bot\bot\db_hanler.py", line 78, in init_connection
    engine = create_async_engine(connection_string, future=True, echo=True)
  File "D:\Space\discord_count_bot\bot_env\lib\site-packages\sqlalchemy\ext\asyncio\engine.py", line 40, in create_async_engine
    sync_engine = _create_engine(*arg, **kw)
  File "<string>", line 2, in create_engine
  File "D:\Space\discord_count_bot\bot_env\lib\site-packages\sqlalchemy\util\deprecations.py", line 298, in warned
    return fn(*args, **kwargs)
  File "D:\Space\discord_count_bot\bot_env\lib\site-packages\sqlalchemy\engine\create.py", line 560, in create_engine
    dbapi = dialect_cls.dbapi(**dbapi_args)
  File "D:\Space\discord_count_bot\bot_env\lib\site-packages\sqlalchemy\dialects\postgresql\psycopg2.py", line 782, in dbapi
    import psycopg2
ModuleNotFoundError: No module named 'psycopg2'

Answer 1

正如戈德·汤普森所说，我需要在连接字符串中更加具体，我 postgresql+asyncpg://\xe2\x80\xa6做到了，谢谢）

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