using SQLalchemy as a standalone lib.

from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from app.models import YOUR_MODELS

SQLALCHEMY_DATABASE_URI = 'YOUR_DB_SERVER_URI'
engine = create_engine(SQLALCHEMY_DATABASE_URI, echo=False)
Base = declarative_base()
Base.metadata.create_all(engine)
Session = sessionmaker(bind=engine)
Session.configure(bind=engine)
session = Session()

def get_all_entries()
    ads = session.query(YOUR_MODEL).all()