最近,我正在尝试将编码/数据库包与我的 postgres 数据库一起使用。我都做对了。但是当我用 uvicorn 运行它时,我看到它告诉我 psycopg2 没有安装。我不想使用 psycopg2。所以,我重述了所有并运行databases[postgresql]
而不是databases
只运行。我也安装了asyncpg
。但我仍然看到同样的错误。我也在虚拟环境中做所有事情。我的代码附在下面:
import databases, sqlalchemy, asyncpg
from fastapi import FastAPI
#POSTGRES DATABASE
DATABASE_URL = "postgresql://xxxxxxxxxxx" # hidden
database = databases.Database(DATABASE_URL)
metadata = sqlalchemy.MetaData()
users = sqlalchemy.Table(
"py_users",
metadata,
sqlalchemy.Column("id" , sqlalchemy.String, primary_key=True),
sqlalchemy.Column("username" , sqlalchemy.String),
sqlalchemy.Column("password" , sqlalchemy.String),
sqlalchemy.Column("first_name", sqlalchemy.String),
sqlalchemy.Column("last_name" , sqlalchemy.String),
sqlalchemy.Column("gender" , sqlalchemy.CHAR ),
sqlalchemy.Column("created_at", sqlalchemy.String),
sqlalchemy.Column("status" , sqlalchemy.CHAR ),
)
engine = sqlalchemy.create_engine(
DATABASE_URL
)
metadata.create_all(engine)
app = FastAPI()
@app.get('/users')
def find_all_users():
return "List All Users"
回溯是:
INFO: Uvicorn running on http://0.0.0.0:8000 (Press CTRL+C to quit)
INFO: Started reloader process [110] using statreload
Process SpawnProcess-1:
Traceback (most recent call last):
File "/usr/lib/python3.8/multiprocessing/process.py", line 315, in _bootstrap
self.run()
File "/usr/lib/python3.8/multiprocessing/process.py", line 108, in run
self._target(*self._args, **self._kwargs)
File "/home/runner/HelloCoderFastAPITuto/env/lib/python3.8/site-packages/uvicorn/subprocess.py", line 61, in subprocess_started
target(sockets=sockets)
File "/home/runner/HelloCoderFastAPITuto/env/lib/python3.8/site-packages/uvicorn/_impl/asyncio.py", line 47, in run
loop.run_until_complete(self.serve(sockets=sockets))
File "/usr/lib/python3.8/asyncio/base_events.py", line 616, in run_until_complete
return future.result()
File "/home/runner/HelloCoderFastAPITuto/env/lib/python3.8/site-packages/uvicorn/_impl/asyncio.py", line 54, in serve
config.load()
File "/home/runner/HelloCoderFastAPITuto/env/lib/python3.8/site-packages/uvicorn/config.py", line 306, in load
self.loaded_app = import_from_string(self.app)
File "/home/runner/HelloCoderFastAPITuto/env/lib/python3.8/site-packages/uvicorn/importer.py", line 23, in import_from_string
raise exc from None
File "/home/runner/HelloCoderFastAPITuto/env/lib/python3.8/site-packages/uvicorn/importer.py", line 20, in import_from_string
module = importlib.import_module(module_str)
File "/usr/lib/python3.8/importlib/__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
File "<frozen importlib._bootstrap>", line 991, in _find_and_load
File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 783, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "./main.py", line 22, in <module>
engine = sqlalchemy.create_engine(
File "/opt/virtualenvs/python3/lib/python3.8/site-packages/sqlalchemy/engine/__init__.py", line 500, in create_engine
return strategy.create(*args, **kwargs)
File "/opt/virtualenvs/python3/lib/python3.8/site-packages/sqlalchemy/engine/strategies.py", line 87, in create
dbapi = dialect_cls.dbapi(**dbapi_args)
File "/opt/virtualenvs/python3/lib/python3.8/site-packages/sqlalchemy/dialects/postgresql/psycopg2.py", line 778, in dbapi
import psycopg2
ModuleNotFoundError: No module named 'psycopg2'
从上面的错误我认为包数据库正在尝试使用 psycopg2 而不是 asyncpg。在那种情况下,我如何强制数据库包使用 asyncpg 而不是 psycopg2。如果不是这种情况,我该如何使用 asyncpg 而不是使用 psycopg2?
提前致谢。
我的问题可能有一些错误。请忽略那些愚蠢的错误,如果您在我的问题中发现任何错误,请编辑问题