"""
数据库连接管理
"""
from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession
from sqlalchemy.orm import sessionmaker, declarative_base
from app.core.config import settings

# 创建异步引擎
engine = create_async_engine(
    settings.DATABASE_URL,
    echo=settings.DEBUG,
    pool_pre_ping=True,
    pool_size=10,
    max_overflow=20,
)

# 创建异步会话工厂
AsyncSessionLocal = sessionmaker(
    engine,
    class_=AsyncSession,
    expire_on_commit=False,
    autocommit=False,
    autoflush=False,
)

# 创建基础模型类
Base = declarative_base()


async def get_db():
    """
    获取数据库会话（依赖注入）
    """
    async with AsyncSessionLocal() as session:
        try:
            yield session
        finally:
            await session.close()