import os

from dotenv import load_dotenv
from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker

load_dotenv()

DATABASE_URL = f"mysql+pymysql://root:{os.getenv('DB_PASSWORD')}@{os.getenv('DB_HOST')}:3306/health"

engine = create_engine(url=DATABASE_URL, pool_pre_ping=True, pool_recycle=3600)

# 会话工厂
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
# ORM基类
Base = declarative_base()


def get_db():
    # 创建数据库会话实例
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()