a261d9da27
- 优化 api/database/database.py - 更新 api/requirements.txt Co-authored-by: Cursor <cursoragent@cursor.com>
82 lines
2.4 KiB
Python
82 lines
2.4 KiB
Python
"""
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数据库连接和初始化
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仅支持 PostgreSQL
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"""
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import os
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from sqlalchemy import create_engine
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from sqlalchemy.orm import sessionmaker, Session
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from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession, async_sessionmaker
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from .models import Base
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# 从环境变量获取数据库 URL
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raw_database_url = os.getenv("DATABASE_URL", "postgresql://postgres:postgres@localhost:5432/life_echo")
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def parse_database_url(url: str) -> tuple[str, str]:
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"""
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解析数据库 URL，返回同步和异步版本
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支持格式：
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- PostgreSQL: postgresql://user:pass@host:port/db
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- PostgreSQL async: postgresql+asyncpg://user:pass@host:port/db
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"""
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if url.startswith("postgresql+asyncpg://"):
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async_url = url
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sync_url = url.replace("postgresql+asyncpg://", "postgresql://")
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elif url.startswith("postgresql://"):
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sync_url = url
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async_url = url.replace("postgresql://", "postgresql+asyncpg://")
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else:
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print(f"警告: DATABASE_URL 格式不正确 ({url})，使用默认 PostgreSQL")
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sync_url = "postgresql://postgres:postgres@localhost:5432/life_echo"
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async_url = "postgresql+asyncpg://postgres:postgres@localhost:5432/life_echo"
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return sync_url, async_url
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DATABASE_URL, ASYNC_DATABASE_URL = parse_database_url(raw_database_url)
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# 同步引擎（用于迁移、Celery 任务等），使用 psycopg
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sync_url = DATABASE_URL.replace("postgresql://", "postgresql+psycopg://")
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engine = create_engine(sync_url, pool_size=5, max_overflow=10)
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# 异步引擎（用于 FastAPI）
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async_engine = create_async_engine(
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ASYNC_DATABASE_URL,
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echo=False,
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pool_size=5,
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max_overflow=10,
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)
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# 会话工厂
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SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
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AsyncSessionLocal = async_sessionmaker(async_engine, class_=AsyncSession, expire_on_commit=False)
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def init_db():
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"""初始化数据库，创建所有表"""
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Base.metadata.create_all(bind=engine)
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def get_db():
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"""获取同步数据库会话（用于迁移等）"""
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db = SessionLocal()
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try:
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yield db
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finally:
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db.close()
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async def get_async_db():
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"""获取异步数据库会话（用于实际应用）"""
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async with AsyncSessionLocal() 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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finally:
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await session.close()
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