79 lines
2.3 KiB
Python
79 lines
2.3 KiB
Python
"""
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数据库连接管理
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SQLite 数据库，支持异步操作。
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"""
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from __future__ import annotations
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from pathlib import Path
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from typing import AsyncGenerator
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from sqlalchemy import text
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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 app.config import settings
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# ──────────────────────────── 数据库引擎 ────────────────────────────
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DB_URL = settings.DATABASE_URL
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# 解析 SQLite 文件路径
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sqlite_path = DB_URL.replace("sqlite+aiosqlite:///", "")
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if not sqlite_path.startswith("/"):
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sqlite_path = str(Path(__file__).parent.parent / sqlite_path)
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# 确保数据目录存在
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Path(sqlite_path).parent.mkdir(parents=True, exist_ok=True)
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engine = create_async_engine(
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f"sqlite+aiosqlite:///{sqlite_path}",
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echo=False,
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)
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# ──────────────────────────── 会话工厂 ────────────────────────────
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async_session_factory = 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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# ──────────────────────────── 依赖注入 ────────────────────────────
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async def get_db() -> AsyncGenerator[AsyncSession, None]:
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"""
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FastAPI 依赖项：获取异步数据库会话。
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请求正常结束后自动 commit，异常时自动 rollback。
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"""
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async with async_session_factory() as session:
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try:
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yield session
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await session.commit()
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except Exception:
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await session.rollback()
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raise
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async def close_db() -> None:
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"""关闭数据库连接池"""
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await engine.dispose()
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async def init_db() -> None:
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"""初始化数据库：建表"""
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from app.models.base import Base
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async with engine.begin() as conn:
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# SQLite 启用 WAL 模式和外键约束
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await conn.execute(text("PRAGMA journal_mode=WAL"))
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await conn.execute(text("PRAGMA foreign_keys=ON"))
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# 创建所有表
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await conn.run_sync(Base.metadata.create_all)
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