"""
数据库连接模块
"""
from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine, async_sessionmaker
from sqlalchemy.orm import DeclarativeBase
from app.core.config import settings


# 创建异步引擎
engine = create_async_engine(
    settings.DATABASE_URL,
    echo=settings.DEBUG,
)

# 创建异步会话工厂
async_session_maker = async_sessionmaker(
    engine,
    class_=AsyncSession,
    expire_on_commit=False,
)


class Base(DeclarativeBase):
    """数据库模型基类"""
    pass


async def get_db() -> AsyncSession:
    """获取数据库会话依赖"""
    async with async_session_maker() as session:
        try:
            yield session
            await session.commit()
        except Exception:
            await session.rollback()
            raise
        finally:
            await session.close()