53 lines
1.2 KiB
Python
53 lines
1.2 KiB
Python
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"""异步 SQLAlchemy 数据库连接。"""
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from __future__ import annotations
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from collections.abc import AsyncGenerator
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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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from sqlalchemy.orm import DeclarativeBase
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from app.config import settings
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class Base(DeclarativeBase):
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"""所有 ORM 模型的基类。"""
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engine = create_async_engine(
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settings.database_url,
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echo=False,
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pool_size=5,
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max_overflow=10,
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pool_pre_ping=True,
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pool_recycle=1800,
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)
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AsyncSessionLocal = async_sessionmaker(
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bind=engine,
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class_=AsyncSession,
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expire_on_commit=False,
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autoflush=False,
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)
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async def get_session() -> AsyncGenerator[AsyncSession, None]:
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"""FastAPI 依赖:请求级 session。"""
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async with AsyncSessionLocal() as session:
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try:
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yield session
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finally:
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await session.close()
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async def init_db() -> None:
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"""开发期用,生产请用 alembic。"""
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# import models to register them
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from app.models import article, source, user # noqa: F401
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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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