我是mongodb的新手。
我从mongodb集合中获得了这些字符串：
"DeliveryParams" : [],
"Address" : "09360951914",
"Payload" : "{\"Id\":\"4573358d-8cac-44a4-85e0-2343wres4321\",\"CreationDateTime\":\"\\/Date(1477834196111)\\/\",\"DeviceId\":\"\",\"UserId\":\"b9cdd9d3-4ac8-4f95-8s44-1234wre44321\",\"UserFullName\":\"groot\",\"SystemId\":\"monitoring\",\"SystemTitle\":\"monitoring\",\"EventId\":\"monitoring.events.udutyallcalculates\",\"EventTitle\":\"xxxx\",\"EventData\":[{\"Key\":\"LogID\",\"Value\":\"\",\"Children\":null},{\"Key\":\"SessionId\",\"Value\":\"GUID\",\"Children\":null},{\"Key\":\"Version\",\"Value\":\"Host- Version=1111\",\"Children\":null}],\"BusinessCode\":\"2-10-102606-46-1-0-0\",\"ProcessId\":\"00000000-0000-0000-0000-000000000000\",\"WorkItemId\":ttt,\"WKT\":\"\"}"
我如何才能在 Payload 字段中拆分此\"BusinessCode\":\"2-10-102606-46-1-0-0\"部分？
因为我想将此部分（ BusinessCode ）作为新字段添加到我的收藏中!!! 是否有mongodb任何方法来执行此方案？