zk
60 lines
1.6 KiB
Python
60 lines
1.6 KiB
Python
from collections.abc import AsyncGenerator
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from typing import Optional
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from sqlalchemy.ext.asyncio import (
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AsyncEngine,
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AsyncSession,
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async_sessionmaker,
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create_async_engine,
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)
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from sqlalchemy.orm import DeclarativeBase
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from app.config import settings
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from app.core.logger import log
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# 全局引擎和会话工厂
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engine: Optional[AsyncEngine] = None
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async_session_factory: Optional[async_sessionmaker[AsyncSession]] = None
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class Base(DeclarativeBase):
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"""ORM 声明基类"""
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pass
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async def init_db() -> None:
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"""初始化数据库引擎和会话工厂"""
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global engine, async_session_factory
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engine = create_async_engine(
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settings.database_url,
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pool_size=settings.db_pool_size,
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max_overflow=settings.db_max_overflow,
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pool_recycle=settings.db_pool_recycle,
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echo=settings.env == "dev",
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)
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async_session_factory = async_sessionmaker(engine, expire_on_commit=False)
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log.info("数据库连接池已初始化")
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async def close_db() -> None:
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"""关闭数据库引擎，释放连接池"""
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global engine
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if engine:
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await engine.dispose()
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log.info("数据库连接池已关闭")
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async def get_db() -> AsyncGenerator[AsyncSession, None]:
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"""依赖注入：提供异步数据库会话，自动 commit/rollback/close"""
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if async_session_factory is None:
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raise RuntimeError("数据库未初始化，请先调用 init_db()")
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async with async_session_factory() as session:
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try:
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yield session
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await session.commit()
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except Exception:
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await session.rollback()
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raise
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