0591e9d7c1
- 新增PostgreSQL服务支持，使用最新版17 - 更新Docker Compose配置以支持PostgreSQL和Redis - 修改数据库连接逻辑，支持PostgreSQL和SQLite - 更新文档以反映新的数据库配置和使用方法 - 优化数据模型，确保时间戳字段支持时区
102 lines
3.2 KiB
Python
102 lines
3.2 KiB
Python
"""
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数据库连接和初始化
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支持 PostgreSQL（推荐）和 SQLite（本地开发）
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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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- SQLite: sqlite:///./path/to/db.db
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- SQLite async: sqlite+aiosqlite:///./path/to/db.db
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"""
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# PostgreSQL
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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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# SQLite
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elif url.startswith("sqlite+aiosqlite://"):
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async_url = url
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sync_url = url.replace("sqlite+aiosqlite://", "sqlite://")
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elif url.startswith("sqlite://"):
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sync_url = url
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async_url = url.replace("sqlite://", "sqlite+aiosqlite://")
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else:
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# 默认使用 PostgreSQL
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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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# 创建同步引擎（用于迁移、Celery 任务等）
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# SQLite 需要特殊的 connect_args
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if DATABASE_URL.startswith("sqlite"):
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engine = create_engine(DATABASE_URL, connect_args={"check_same_thread": False})
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else:
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# 使用 psycopg (v3) 驱动
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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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# 创建异步引擎（用于 FastAPI）
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if ASYNC_DATABASE_URL.startswith("sqlite"):
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async_engine = create_async_engine(ASYNC_DATABASE_URL, echo=False)
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else:
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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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# 创建会话工厂
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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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