如何在多个嵌套循环中等待MongoDB结果

import asyncio
from motor.motor_asyncio import AsyncIOMotorClient

async def fetch_data():
    # 创建MongoDB连接
    client = AsyncIOMotorClient('mongodb://localhost:27017')
    db = client['mydatabase']
    collection = db['mycollection']

    # 查询数据
    cursor = collection.find()

    # 遍历结果
    async for document in cursor:
        # 处理每个文档
        print(document)

async def main():
    # 创建事件循环
    loop = asyncio.get_event_loop()

    # 执行异步任务
    await asyncio.wait([fetch_data()])

    # 关闭事件循环
    loop.close()

# 运行主函数
asyncio.run(main())