simple-ocpp-cs/backend/app/database.py

import os
from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker

if os.getenv("CS_DATABASE_URL", "invalid") == "invalid":
    raise SystemExit('ERROR: Invalid CS_DATABASE_URL environment variable')

SQLALCHEMY_DATABASE_URL = os.getenv("CS_DATABASE_URL")

if SQLALCHEMY_DATABASE_URL.startswith("sqlite"):
    engine = create_engine(
        SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False}
    )
else:
    engine = create_engine(SQLALCHEMY_DATABASE_URL)

SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

Base = declarative_base()

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