30 lines
827 B
Python
30 lines
827 B
Python
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"""异步数据库引擎 + 会话。
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- engine / SessionLocal:全局单例
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- get_session:FastAPI 依赖,按请求注入一个会话
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- init_db:启动时建表(MVP 用 create_all;表结构稳定后切 alembic 迁移,对齐 dograh)
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"""
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from collections.abc import AsyncGenerator
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import config
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from db.models import Base
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from sqlalchemy.ext.asyncio import (
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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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engine = create_async_engine(config.DATABASE_URL, echo=False, pool_pre_ping=True)
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SessionLocal = async_sessionmaker(engine, expire_on_commit=False)
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async def get_session() -> AsyncGenerator[AsyncSession, None]:
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async with SessionLocal() as session:
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yield session
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async def init_db() -> None:
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async with engine.begin() as conn:
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await conn.run_sync(Base.metadata.create_all)
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