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

from config.setting import settings

DATABASE_URL = f"mysql+pymysql://{settings.DB_USER}:{settings.DB_PASSWORD}@{settings.DB_HOST}:{settings.DB_PORT}/{settings.DB_NAME}"

engine = create_engine(url=DATABASE_URL)

# 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()