Mongo Db：如何从json中提取所有值？

Question

我是Mongo Db的新手，我想使用此json文件的值进行查询。

{
"_id" : ObjectId("5be56f93b75242476aa11b2d"),
"RobotId" : "R1C",
"StartTime" : "28 03 2017",
"CycleTime" : 23.94,
"RobotProgram" : 1,
"sensorData" : {
    "Current" : {
        "UoM" : "Ampere",
        "values" : [ 
            -0.74458, 
            -0.78601, 
            -0.7211...]
 }