我正在尝试连接到我的docker postgresql映像,但python中的SQLAlchemy拒绝连接。
我使用以下命令创建了一个docker实例:
docker run -d --name postgres-m2m -p 5432:5432 -e POSTGRES_USER=postgres -e POSTGRES_PASSWORD=pass postgres
我可以使用Pycharm的数据库右侧面板成功连接到我的实例。 check the screen capture
所以我试着将它与我的python应用程序连接起来。
首先我创建了settings / config.py文件:
class dbCredentials:
DB_USER = 'postgres'
DB_PASS = 'pass'
DB_NAME = 'postgres'
DB_HOST = '0.0.0.0'
DB_PORT = '5432'
DB_SCHEMA = 'telecom'
def __int__(self):
pass
然后我的模型/ base.py
from sqlalchemy import create_engine, MetaData
from sqlalchemy.orm import sessionmaker
from sqlalchemy.ext.declarative import declarative_base
from settings.config import dbCredentials
credentials = dbCredentials()
DB_USER = credentials.DB_USER
DB_PASS = credentials.DB_PASS
DB_HOST = credentials.DB_HOST
DB_PORT = credentials.DB_PORT
DB_NAME = credentials.DB_NAME
DB_SCHEMA = credentials.DB_SCHEMA
engine = create_engine(f'postgresql://{DB_USER}:{DB_PASS}@{DB_HOST}:{DB_PORT}/{DB_NAME}')
Session = sessionmaker(bind=engine)
Base = declarative_base(metadata=MetaData(schema=DB_SCHEMA))
之后我创建了表模型/ tables / status.py
from sqlalchemy import Column, SmallInteger, String
from src.models.base import Base
class Status(Base):
__tablename__ = 'status'
id = Column('id', SmallInteger, primary_key=True, autoincrement=True, nullable=False)
STATUS = Column('STATUS', String, nullable=False)
def __init__(self, STATUS):
self.STATUS = STATUS
最后是我的main.py文件
from src.models.base import Base, Session, engine
from src.models.tables.status import Status
Base.metadata.create_all(engine, checkfirst=True)
session = Session()
此时我收到以下错误:
[...] conn = _connect(dsn,connection_factory = connection_factory,** kwasync)sqlalchemy.exc.OperationalError:(psycopg2.OperationalError)致命:角色“postgres”不存在(关于此错误的背景:http://sqlalche.me/e/e3q8)
任何人都可以帮我解决这个问题吗?
谢谢!
postgres
,但在config.py文件中,您已将其设置为stone
。这是故意的吗?localhost
或<IP address>
等特定界面上运行数据库,并相应地更新配置文件。