### 基本用法
```python

from mongoengine import connect, DynamicDocument


# connect as a default connection
connect('project', host='192.168.20.19', port=8085, username='xxxx', password='xxxx')

# DynamicDocument: 动态文档，可直接使用不存在的字段
class samplelist(DynamicDocument):
    pass

# query
samplelist.objects(novoid='ZTD17036694')

# update
# upsert=True  存在时更新，不存在时新建
samplelist.objects(novoid='ZTD17036694').update(upsert=True, qccheck="Pass")

```