函数对象没有属性 'connect'

Question

我的 sql 炼金术连接似乎有问题，不明白为什么？它有时有效，但下一次无效。另外 vs code 不会自动推荐 sql alchemy 方法，也许我设置错了？

--database.py 文件

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


sqlalchemy_conn= 'postgresql://postgres:naija4life@localhost/fastapi database'
ormengine= create_engine(sqlalchemy_conn)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind= ormengine )
Base = declarative_base()


# Dependency
def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()

主文件

from logging import exception
from random import randrange
from tkinter.tix import STATUS
from typing import Optional
from urllib import response
from fastapi import Body, FastAPI, Query, Response ,status, HTTPException , Depends
from pydantic import BaseModel
import psycopg2
from psycopg2.extras import RealDictCursor
import time
import sqlalchemy
from sqlalchemy import create_engine, engine_from_config 
from sqlalchemy.ext.declarative import declarative_base 
from sqlalchemy.orm import sessionmaker,session , query
import models 
from database import ormengine , SessionLocal , get_db




app= FastAPI()

models.Base.metadata.create_all(bind=ormengine)



while True:
    try:   
        conn = psycopg2.connect(dbname= 'fastapi database', 
        host= 'localhost' , port= 5432 , 
        user = 'postgres', password= 'naija4life' )
        cur = conn.cursor()
        print('database connection succesful')
        break 
    except Exception as error :
        print("connection failed")
        print("error explanation:", error)
        time.sleep(2)

class Post(BaseModel):
    title: str
    content: str
    Published: bool = True
    rating: Optional[int] = None

@app.get("/sqlalchemy")
def test_post(db: session= Depends(get_db)):
    post= db.query(models.Post).all()
    return {"data":post}

我得到的错误：

   return await future
  File "C:\Users\aobin\OneDrive\Documents\API proj\fast\lib\site-packages\anyio\_backends\_asyncio.py", line 754, in run
    result = context.run(func, *args)
  File "C:\Users\aobin\OneDrive\Documents\API proj\app\.\main.py", line 78, in test_post
    post= db.query(models.Post).all()
  File "C:\Users\aobin\OneDrive\Documents\API proj\fast\lib\site-packages\sqlalchemy\orm\query.py", line 
2759, in all
    return self._iter().all()
  File "C:\Users\aobin\OneDrive\Documents\API proj\fast\lib\site-packages\sqlalchemy\orm\query.py", line 
2894, in _iter
    result = self.session.execute(
  File "C:\Users\aobin\OneDrive\Documents\API proj\fast\lib\site-packages\sqlalchemy\orm\session.py", line 1691, in execute
    conn = self._connection_for_bind(bind)
  File "C:\Users\aobin\OneDrive\Documents\API proj\fast\lib\site-packages\sqlalchemy\orm\session.py", line 1532, in _connection_for_bind
    return self._transaction._connection_for_bind(
  File "C:\Users\aobin\OneDrive\Documents\API proj\fast\lib\site-packages\sqlalchemy\orm\session.py", line 747, in _connection_for_bind
    conn = bind.connect()
AttributeError: 'function' object has no attribute 'connect'

在我看来，sql alchemy 的查询方法由于某种原因无法正常工作。它不会在 vs code 上自动完成either.I已经尝试了其他变体：sql_expresson，

Answer 1

我正在浏览 SQL 炼金术文档。引擎连接 url 位于 double-quotes 那里……所以我在我的文档中更改了它……它起作用了。 -.-'''

sqlalchemy_conn='postgresql://postgres:naija4life@localhost/fastapi database' 成为 sqlalchemy_conn= "postgresql://postgres:naija4life@localhost/fastapi 数据库"

函数对象没有属性 'connect'

function object has no attribute 'connect'

python

sqlalchemy

fastapi