需求场景 1查询一辆车最新一条的记录 2查:05:00-06:00的历史数据 3并发保存
MongoDB -- MongoClient连接池用法 http://blog.csdn.net/gaopeng0071/article/details/51281103
CarRecord "id": 0, "sn": "250004166", "idc": "19250004166", "gpsTime": 1491014684000, "longitude": 113.561008, "latitude": 34.79589, "speed": 16, "direction": 136, "altitude": 109 "receivedTime": 1491014651000, "electricity": "70/100", "mileage": "", "engineStatus": 1, "leftFrontDoor": 0, "rightFrontDoor": 0, "leftRearDoor": 0, "rightRearDoor": 0, "centralLckingStatus": 1, "lightsStatus": 0, "chargeStatus": 0, "totalMileage": 2346, "voltage": "12.2", "on": 1