wehub-resource-sync
48 lines
1.1 KiB
Python
48 lines
1.1 KiB
Python
"""SQLAlchemy async 引擎与 session 管理。"""
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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 .config import get_settings
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settings = get_settings()
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engine = create_async_engine(
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settings.database_url,
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echo=settings.debug,
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pool_size=10,
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max_overflow=20,
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pool_pre_ping=True,
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)
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async_session = async_sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)
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class Base(DeclarativeBase):
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"""所有 ORM 模型的基类。"""
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pass
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async def get_db() -> AsyncSession:
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"""FastAPI 依赖注入 — 获取异步数据库 session。
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提交策略：由服务层显式 commit/flush 控制，
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此处仅负责异常时 rollback，避免双重提交。
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"""
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async with async_session() as session:
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try:
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yield session
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except Exception:
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await session.rollback()
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raise
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async def init_db():
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"""开发用 — 创建所有表（生产用 Alembic）。"""
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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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