69 lines
1.5 KiB
Python
69 lines
1.5 KiB
Python
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"""
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Database Configuration and Session Management
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支持 SQLite 和 PostgreSQL
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"""
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from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine, async_sessionmaker
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from sqlalchemy.orm import DeclarativeBase
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from sqlalchemy import create_engine
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from app.core.config import get_settings
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settings = get_settings()
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def get_engine_config():
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"""根据数据库类型返回引擎配置"""
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if settings.DATABASE_URL.startswith("sqlite"):
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return {"echo": settings.DEBUG}
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else:
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return {
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"echo": settings.DEBUG,
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"pool_pre_ping": True,
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"pool_size": 10,
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"max_overflow": 20,
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}
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# Async engine for FastAPI
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async_engine = create_async_engine(
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settings.DATABASE_URL,
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**get_engine_config()
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)
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# Sync engine for migrations
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sync_engine = create_engine(
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settings.DATABASE_URL_SYNC,
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echo=settings.DEBUG,
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pool_pre_ping=True,
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)
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# Async session factory
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AsyncSessionLocal = async_sessionmaker(
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async_engine,
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class_=AsyncSession,
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expire_on_commit=False,
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autocommit=False,
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autoflush=False,
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)
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class Base(DeclarativeBase):
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"""Base class for all models"""
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pass
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async def init_db():
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"""Initialize database tables"""
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async with async_engine.begin() as conn:
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await conn.run_sync(Base.metadata.create_all)
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async def get_db() -> AsyncSession:
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"""Dependency for getting database session"""
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async with AsyncSessionLocal() as session:
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try:
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yield session
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finally:
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await session.close()
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