小鱼开发
62 lines
1.3 KiB
Python
62 lines
1.3 KiB
Python
"""
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SQLAlchemy 数据库配置
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====================
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统一使用 PostgreSQL + 异步模式。
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"""
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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 sqlalchemy.orm import declarative_base
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from app.config import get_settings
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Base = declarative_base()
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settings = get_settings()
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async_engine = create_async_engine(
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settings.DATABASE_URL,
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pool_size=settings.DATABASE_POOL_SIZE,
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max_overflow=settings.DATABASE_MAX_OVERFLOW,
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pool_pre_ping=True,
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echo=settings.DEBUG,
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)
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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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async def get_db():
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"""获取异步数据库 Session
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注意：commit 由调用方（API层或Service层）控制，不在此自动提交
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"""
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async with AsyncSessionLocal() as session:
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try:
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yield session
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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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async def init_db():
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"""初始化数据库"""
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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 close_db():
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"""关闭数据库连接"""
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await async_engine.dispose()
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