Joey
58 lines
1.7 KiB
Python
58 lines
1.7 KiB
Python
"""数据库：SQLite（aiosqlite）+ SQLAlchemy async。"""
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from __future__ import annotations
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from collections.abc import AsyncGenerator
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from sqlalchemy import text
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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 get_settings
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class Base(DeclarativeBase):
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pass
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_engine = None
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_session_factory: async_sessionmaker[AsyncSession] | None = None
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def get_engine():
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global _engine, _session_factory
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if _engine is None:
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settings = get_settings()
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db_path = f"{settings.data_dir}/app.db"
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_engine = create_async_engine(f"sqlite+aiosqlite:///{db_path}", echo=False)
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_session_factory = async_sessionmaker(_engine, expire_on_commit=False)
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return _engine
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def get_session_factory() -> async_sessionmaker[AsyncSession]:
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get_engine()
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assert _session_factory is not None
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return _session_factory
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async def get_db() -> AsyncGenerator[AsyncSession, None]:
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async with get_session_factory()() as session:
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yield session
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async def _migrate(conn) -> None:
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"""给旧库补充新增列（create_all 不会修改已存在的表）。"""
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rows = await conn.execute(text("PRAGMA table_info(suites)"))
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cols = {row[1] for row in rows}
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if "model" not in cols:
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await conn.execute(text("ALTER TABLE suites ADD COLUMN model VARCHAR(64)"))
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async def init_db() -> None:
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"""启动时建表 + 轻量列迁移（MVP 不引 Alembic）。"""
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import models # noqa: F401 确保模型注册
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engine = get_engine()
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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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await _migrate(conn)
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