"""
数据库连接
"""
from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession
from sqlalchemy.orm import sessionmaker, declarative_base
from app.config import get_settings

settings = get_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
AsyncSessionLocal = sessionmaker(
    bind=engine,
    class_=AsyncSession,
    expire_on_commit=False
)

# 基类
Base = declarative_base()


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