sqlalchemy.exc.OperationalError：（psycopg2.OperationalError）与 PostgreSQL

问题描述 投票：0回答：2

我搜索了很多这个错误，但我只找到了一些背后有更多信息的错误，例如“致命：...”。我的没有。它只是说

sqlalchemy.exc.OperationalError: (psycopg2.OperationalError)

我在 docker 容器内有一个 postgres 数据库，该数据库已将其端口设置为标准 5432。 我使用以下命令创建了容器：

docker run --name some-postgres -e POSTGRES_PASSWORD=mysecretpassword -p 5432:5432 -d postgres

它很干净，因此没有创建数据库。 API 应该自动创建它们。

我正在使用Pycharm IDE，也许与此有关。

Traceback (most recent call last):
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\uvicorn\protocols\http\h11_impl.py", line 373, in run_asgi
    result = await app(self.scope, self.receive, self.send)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\uvicorn\middleware\proxy_headers.py", line 75, in __call__
    return await self.app(scope, receive, send)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\uvicorn\middleware\debug.py", line 96, in __call__
    raise exc from None
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\uvicorn\middleware\debug.py", line 93, in __call__
    await self.app(scope, receive, inner_send)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\fastapi\applications.py", line 208, in __call__
    await super().__call__(scope, receive, send)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\starlette\applications.py", line 112, in __call__
    await self.middleware_stack(scope, receive, send)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\starlette\middleware\errors.py", line 181, in __call__
    raise exc from None
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\starlette\middleware\errors.py", line 159, in __call__
    await self.app(scope, receive, _send)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\starlette\exceptions.py", line 82, in __call__
    raise exc from None
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\starlette\exceptions.py", line 71, in __call__
    await self.app(scope, receive, sender)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\starlette\routing.py", line 580, in __call__
    await route.handle(scope, receive, send)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\starlette\routing.py", line 241, in handle
    await self.app(scope, receive, send)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\starlette\routing.py", line 52, in app
    response = await func(request)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\fastapi\routing.py", line 226, in app
    raw_response = await run_endpoint_function(
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\fastapi\routing.py", line 159, in run_endpoint_function
    return await dependant.call(**values)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\app\routers\v1\users.py", line 31, in create_user
    session.commit()
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\orm\session.py", line 1428, in commit
    self._transaction.commit(_to_root=self.future)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\orm\session.py", line 829, in commit
    self._prepare_impl()
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\orm\session.py", line 808, in _prepare_impl
    self.session.flush()
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\orm\session.py", line 3339, in flush
    self._flush(objects)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\orm\session.py", line 3479, in _flush
    transaction.rollback(_capture_exception=True)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\util\langhelpers.py", line 70, in __exit__
    compat.raise_(
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\util\compat.py", line 207, in raise_
    raise exception
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\orm\session.py", line 3439, in _flush
    flush_context.execute()
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\orm\unitofwork.py", line 456, in execute
    rec.execute(self)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\orm\unitofwork.py", line 630, in execute
    util.preloaded.orm_persistence.save_obj(
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\orm\persistence.py", line 209, in save_obj
    for (
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\orm\persistence.py", line 370, in _organize_states_for_save
    for state, dict_, mapper, connection in _connections_for_states(
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\orm\persistence.py", line 1709, in _connections_for_states
    connection = uowtransaction.transaction.connection(base_mapper)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\orm\session.py", line 626, in connection
    return self._connection_for_bind(bind, execution_options)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\orm\session.py", line 735, in _connection_for_bind
    conn = self._parent._connection_for_bind(bind, execution_options)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\orm\session.py", line 747, in _connection_for_bind
    conn = bind.connect()
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\future\engine.py", line 419, in connect
    return super(Engine, self).connect()
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\engine\base.py", line 3194, in connect
    return self._connection_cls(self, close_with_result=close_with_result)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\engine\base.py", line 96, in __init__
    else engine.raw_connection()
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\engine\base.py", line 3273, in raw_connection
    return self._wrap_pool_connect(self.pool.connect, _connection)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\engine\base.py", line 3243, in _wrap_pool_connect
    Connection._handle_dbapi_exception_noconnection(
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\engine\base.py", line 2097, in _handle_dbapi_exception_noconnection
    util.raise_(
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\util\compat.py", line 207, in raise_
    raise exception
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\engine\base.py", line 3240, in _wrap_pool_connect
    return fn()
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\pool\base.py", line 310, in connect
    return _ConnectionFairy._checkout(self)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\pool\base.py", line 868, in _checkout
    fairy = _ConnectionRecord.checkout(pool)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\pool\base.py", line 476, in checkout
    rec = pool._do_get()
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\pool\impl.py", line 146, in _do_get
    self._dec_overflow()
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\util\langhelpers.py", line 70, in __exit__
    compat.raise_(
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\util\compat.py", line 207, in raise_
    raise exception
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\pool\impl.py", line 143, in _do_get
    return self._create_connection()
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\pool\base.py", line 256, in _create_connection
    return _ConnectionRecord(self)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\pool\base.py", line 371, in __init__
    self.__connect()
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\pool\base.py", line 666, in __connect
    pool.logger.debug("Error on connect(): %s", e)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\util\langhelpers.py", line 70, in __exit__
    compat.raise_(
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\util\compat.py", line 207, in raise_
    raise exception
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\pool\base.py", line 661, in __connect
    self.dbapi_connection = connection = pool._invoke_creator(self)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\engine\create.py", line 590, in connect
    return dialect.connect(*cargs, **cparams)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\engine\default.py", line 584, in connect
    return self.dbapi.connect(*cargs, **cparams)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\psycopg2\__init__.py", line 122, in connect
    conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
sqlalchemy.exc.OperationalError: (psycopg2.OperationalError) 
(Background on this error at: https://sqlalche.me/e/14/e3q8)

这是我得到的错误。我的代码如下所示：

main.py：

import os
import uvicorn
if __name__ == '__main__':
    port = int(os.getenv("PORT"))
    uvicorn.run("main:app", host='0.0.0.0', port=port, reload=True, debug=True, workers=3)

应用程序/main.py：

import os
from fastapi import FastAPI
from .database import engine
from .routers import v1
engine.init_db()
port = int(os.getenv("PORT")) #Port is 8000
app = FastAPI()

app.include_router(v1.router, prefix="/v1")

app/database/engine.py：（在上面的文件中引用）

import os

from fastapi.security import HTTPBearer
from sqlmodel import create_engine, SQLModel, Session
DATABASE_URL = "postgresql+psycopg2://postgres:mysecretpassword@localhost:5432"
engine = create_engine(DATABASE_URL, echo=True)
token_auth_scheme = HTTPBearer()


async def init_db():
    async with engine.begin() as conn:
        # await conn.run_sync(SQLModel.metadata.drop_all)
        await conn.run_sync(SQLModel.metadata.create_all)


async def get_session():
    session = Session(engine)
    try:
        yield session
    finally:
        session.close()

routers/v1/users.py 中的路由“users”：

from typing import Optional

from fastapi import APIRouter, Depends, HTTPException, Query, Path, Response, status
from pydantic import ValidationError
from sqlalchemy.exc import IntegrityError
from sqlalchemy.sql.functions import concat
from sqlalchemy import func
from sqlmodel import Session, select, col
from starlette import status

from app.database import models
from app.database.authentication import VerifyToken
from app.database.engine import get_session, token_auth_scheme

router = APIRouter()


@router.post("", status_code=status.HTTP_201_CREATED, response_model=models.UserRead,
             response_model_exclude_none=True, name="Create User", tags=["users"])
async def create_user(user_data: models.UserCreate,
                      session: Session = Depends(get_session)):

    try:
        new_user = models.User(**dict(user_data))
        session.add(new_user)
        session.commit()
        session.refresh(new_user)

        return new_user
    except IntegrityError:
        session.rollback()
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT, detail="IntegrityError")
    except ValidationError:
        session.rollback()
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST, detail="ValidationError")

型号。用户：

class UserBase(SQLModel):
    id: str
    username: Optional[str]
    country_code: Optional[str]
    phone: Optional[str]

    class Config:
        allow_population_by_field_name = True

class User(UserBase, table=True):
    __tablename__ = 'users'
    id: str = Field(primary_key=True)
    username: Optional[str] = Field(sa_column=Column('username', VARCHAR(length=50), unique=True, default=None))
    phone: Optional[str] = Field(sa_column=Column('phone', VARCHAR(length=20), unique=True, default=None))

我希望这就是你们寻找东西所需的一切。如果还有其他需要请联系我。

致以诚挚的问候 科林

编辑：

After I changed the link from `postgresql+psycopg2` to `postgresql+asyncpg` I get a new error:

ERROR:    Exception in ASGI application
Traceback (most recent call last):
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\uvicorn\protocols\http\h11_impl.py", line 373, in run_asgi
    result = await app(self.scope, self.receive, self.send)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\uvicorn\middleware\proxy_headers.py", line 75, in __call__
    return await self.app(scope, receive, send)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\uvicorn\middleware\debug.py", line 96, in __call__
    raise exc from None
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\uvicorn\middleware\debug.py", line 93, in __call__
    await self.app(scope, receive, inner_send)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\fastapi\applications.py", line 208, in __call__
    await super().__call__(scope, receive, send)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\starlette\applications.py", line 112, in __call__
    await self.middleware_stack(scope, receive, send)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\starlette\middleware\errors.py", line 181, in __call__
    raise exc from None
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\starlette\middleware\errors.py", line 159, in __call__
    await self.app(scope, receive, _send)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\starlette\exceptions.py", line 82, in __call__
    raise exc from None
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\starlette\exceptions.py", line 71, in __call__
    await self.app(scope, receive, sender)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\starlette\routing.py", line 580, in __call__
    await route.handle(scope, receive, send)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\starlette\routing.py", line 241, in handle
    await self.app(scope, receive, send)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\starlette\routing.py", line 52, in app
    response = await func(request)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\fastapi\routing.py", line 226, in app
    raw_response = await run_endpoint_function(
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\fastapi\routing.py", line 159, in run_endpoint_function
    return await dependant.call(**values)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\app\routers\v1\users.py", line 26, in create_user
    session.commit()
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\orm\session.py", line 1428, in commit
    self._transaction.commit(_to_root=self.future)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\orm\session.py", line 829, in commit
    self._prepare_impl()
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\orm\session.py", line 808, in _prepare_impl
    self.session.flush()
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\orm\session.py", line 3339, in flush
    self._flush(objects)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\orm\session.py", line 3479, in _flush
    transaction.rollback(_capture_exception=True)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\util\langhelpers.py", line 70, in __exit__
    compat.raise_(
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\util\compat.py", line 207, in raise_
    raise exception
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\orm\session.py", line 3439, in _flush
    flush_context.execute()
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\orm\unitofwork.py", line 456, in execute
    rec.execute(self)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\orm\unitofwork.py", line 630, in execute
    util.preloaded.orm_persistence.save_obj(
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\orm\persistence.py", line 209, in save_obj
    for (
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\orm\persistence.py", line 370, in _organize_states_for_save
    for state, dict_, mapper, connection in _connections_for_states(
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\orm\persistence.py", line 1709, in _connections_for_states
    connection = uowtransaction.transaction.connection(base_mapper)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\orm\session.py", line 626, in connection
    return self._connection_for_bind(bind, execution_options)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\orm\session.py", line 735, in _connection_for_bind
    conn = self._parent._connection_for_bind(bind, execution_options)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\orm\session.py", line 747, in _connection_for_bind
    conn = bind.connect()
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\future\engine.py", line 419, in connect
    return super(Engine, self).connect()
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\engine\base.py", line 3194, in connect
    return self._connection_cls(self, close_with_result=close_with_result)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\engine\base.py", line 96, in __init__
    else engine.raw_connection()
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\engine\base.py", line 3273, in raw_connection
    return self._wrap_pool_connect(self.pool.connect, _connection)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\engine\base.py", line 3240, in _wrap_pool_connect
    return fn()
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\pool\base.py", line 310, in connect
    return _ConnectionFairy._checkout(self)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\pool\base.py", line 868, in _checkout
    fairy = _ConnectionRecord.checkout(pool)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\pool\base.py", line 476, in checkout
    rec = pool._do_get()
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\pool\impl.py", line 146, in _do_get
    self._dec_overflow()
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\util\langhelpers.py", line 70, in __exit__
    compat.raise_(
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\util\compat.py", line 207, in raise_
    raise exception
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\pool\impl.py", line 143, in _do_get
    return self._create_connection()
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\pool\base.py", line 256, in _create_connection
    return _ConnectionRecord(self)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\pool\base.py", line 371, in __init__
    self.__connect()
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\pool\base.py", line 666, in __connect
    pool.logger.debug("Error on connect(): %s", e)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\util\langhelpers.py", line 70, in __exit__
    compat.raise_(
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\util\compat.py", line 207, in raise_
    raise exception
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\pool\base.py", line 661, in __connect
    self.dbapi_connection = connection = pool._invoke_creator(self)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\engine\create.py", line 590, in connect
    return dialect.connect(*cargs, **cparams)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\engine\default.py", line 584, in connect
    return self.dbapi.connect(*cargs, **cparams)
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\dialects\postgresql\asyncpg.py", line 748, in connect
    await_only(self.asyncpg.connect(*arg, **kw)),
  File "C:\Users\Veril\PycharmProjects\partyapp-python\venv\lib\site-packages\sqlalchemy\util\_concurrency_py3k.py", line 61, in await_only
    raise exc.MissingGreenlet(
sqlalchemy.exc.MissingGreenlet: greenlet_spawn has not been called; can't call await_() here. Was IO attempted in an unexpected place? (Background on this error at: https://sqlalche.me/e/14/xd2s)

编辑2： 如果我在 docker 中使用本地 postgres 数据库，我会收到此错误。如果我使用 Heroku 的外部数据库，它工作得很好！

编辑3： 所以显然它不适用于我本地的 docker postgres 数据库。现在，我在 heroku 上使用我的生产数据库（因此在外部），并且一切都可以与 

psycopg2
配合使用。我没有找到错误，为什么它不允许我使用本地数据库，但无论如何。

python docker sqlalchemy fastapi sqlmodel
2个回答
2
投票

尽管我可以看到您正在使用默认端口，但也许这可以帮助遇到同样问题的人。 对我来说，问题在于显式端口定义 - 因为我正在运行两个不同的 postgres DB 和（都来自容器），其中一个我设置为监听 5433 端口 - 这给了我完全相同的问题，所以相反

SQLALCHEMY_DATABASE_URL = "postgresql://postgres:password@localhost/fastapi"

我刚刚输入：

SQLALCHEMY_DATABASE_URL = "postgresql://postgres:password@localhost:5433/fastapi"

问题立即解决。

0
投票

我不知道哪一步为我解决了问题，但我尝试了以下步骤：

  1. 我安装了 

    psycopg2-binary==2.9.9
    和 
    psycopg2==2.9.9
    软件包。最初，我怀疑问题可能是由于使用
    psycopg2==2.9.9
    造成的，所以我也安装了
    psycopg2-binary==2.9.9
    来尝试替代方法。

  2. 我使用 PostgreSQL 连接字符串配置了 

    DATABASE_URL
    变量：
    DATABASE_URL = "postgresql+psycopg2://postgres:mysecretpassword@localhost:5432"
    。我确保为 PostgreSQL 数据库连接数据填写正确的值。此外，我尝试通过指定 
    postgresql+psycopg2
    而不是仅 
    postgresql
    来使用特定驱动程序。

  3. 使用

    psql --version
    检查我本地的PostgreSQL版本后，我发现它是PostgreSQL 16.1。然而，psycopg2 似乎无法在 PostgreSQL 16.1 上正常工作。因此，我在本地安装了 PostgreSQL 13 作为替代方案。

  4. 在我的Docker环境中，我最初在构建新容器时遇到了错误。然而，当第二次运行时，错误消失了。因此，第二次启动 Docker 容器似乎解决了问题。

当尝试连接和运行我的 FastAPI + SQLAlchemy 应用程序时，我的本地 PostgreSQL 16 版本最初出现此问题。但是，通过将 Docker Compose 与 PostgreSQL 13 版本映像（而不是 16）一起使用，我成功解决了该问题。我建议尝试安装 PostgreSQL 13 版本，看看是否可以解决问题。

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