dataset结构变更以及添加变更状态函数、删除函数；

同时添加爬虫平台数据源

DAPlatform/Dao/pachong.py

+from pymongo import MongoClient
+
+host = '39.105.93.102'  # 服务器url
+client = MongoClient(host, 27017)  # 服务器端口
+db = client['python-db']
+traffic = db.Traffic
+weather = db.Weather
+airports = db.airports
+
+
+#  查询traffic表中的所有数据并打印
+def get_item():
+    try:
+        result = traffic.find({})
+        for i in result:
+            print(i)
+    except Exception as e:
+        print(e)
+
+
+if __name__ == '__main__':
+    get_item()