42 lines
856 B
Python
42 lines
856 B
Python
"""数据库会话与引擎管理。"""
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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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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 .core.config import settings
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DATABASE_URL = settings.database_url
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def _is_sqlite() -> bool:
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return DATABASE_URL.lower().startswith("sqlite")
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engine: AsyncEngine = create_async_engine(
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DATABASE_URL,
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echo=settings.debug,
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future=True,
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pool_pre_ping=not _is_sqlite(),
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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_db() -> AsyncGenerator[AsyncSession, None]:
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"""FastAPI 依赖：提供数据库会话。"""
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async with AsyncSessionLocal() as session:
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yield session
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