[英]Error when creating a PostgreSQL database using python, sqlalchemy and psycopg2
[英]FastAPI psycopg2 error when creating database for tests
我正在嘗試在我的 FastAPI 應用程序中測試我的數據庫。
from fastapi.testclient import TestClient
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from app.main import app
from app.db import Base, get_db, get_session
SQLALCHEMY_DATABASE_URL = "sqlite:///./test.db"
engine = create_engine(
SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False}
)
TestingSessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
Base.metadata.create_all(bind=engine)
def override_get_db():
try:
db = TestingSessionLocal()
yield db
finally:
db.close()
app.dependency_overrides[get_db] = override_get_db
client = TestClient(app)
def test_get_users():
response = client.get("/users")
assert response.status_code == 200
這給了我一個錯誤sqlalchemy.exc.OperationalError: (psycopg2.OperationalError) could not translate host name "db" to address: Name or service not known
。
在我的app.db
中,這是我定義引擎的方式:
engine = create_engine(settings.DATABASE_URL, pool_pre_ping=True, echo=True, echo_pool=True)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
def get_session():
with Session(engine) as session:
yield session
def get_db() -> Generator:
try:
db = SessionLocal()
yield db
finally:
db.close()
我也嘗試使用get_session
而不是get_db
,然后錯誤是: no such table: users
。 任何想法我的設置有什么問題?
如果你的數據庫中已經有一個表,你必須使用 MetaData 來 map 他們像:
from sqlalchemy import create_engine, MetaData
meta = MetaData(bind=engine)
meta.reflect(views=True)
table_name = meta.tables['table_name']
Session = sessionmaker(autocommit=False, autoflush=False, bind=engine)
session = Session()
def get_db():
db = session
try:
yield db
finally:
db.close()
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.