24 lines
763 B
Python
24 lines
763 B
Python
"""async SQLAlchemy 引擎与会话。"""
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from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
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from sqlalchemy.orm import DeclarativeBase
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from .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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# echo=False；远程 PG 的空闲连接可能被中间层断开，pre_ping + recycle 自动剔除死连接
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engine = create_async_engine(
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settings.database_url, echo=False, future=True,
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pool_pre_ping=True, pool_recycle=1800,
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)
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async_session = async_sessionmaker(engine, expire_on_commit=False, class_=AsyncSession)
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async def get_session() -> AsyncSession:
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"""FastAPI 依赖：提供一个事务会话。"""
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async with async_session() as session:
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yield session
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