使用时间戳节点js从mongodb获取今天导入的数据

Question

我按当前时间戳将报告添加到 MongoDB 数据库中，但我无法检索今天导入的数据，因为当前时间戳与插入数据的时间戳值不同。 如何使用时间戳查看数据？

添加报告

reportsController.addReports = function (req, resp) {


    let battriesObjs = [];
    let banksObjs = [];
    let reports = req.body;

    // console.log(batteries);


    const siteReports = new SiteReports({
        siteId: reports.siteId,
        environmentParam1: reports.envp1,
        environmentParam2: reports.envp2,
        environmentParam3: reports.envp3,
        reportDate: moment().valueOf()
    });


    let btr = reports['battries'];
    btr.forEach(function (btry) {
        const batteryReports = new BatteryReports({
            batteryId: btry.bid,
            batteryStatus: btry.status,
            batteryVoltage: btry.voltage,
            batteryTemperature: btry.temperature,
            reportDate: moment().valueOf()
        });

        battriesObjs.push(batteryReports);
    });


    siteReports
        .save()
        .then(value => {
            console.log("insert sampleCollection result ", value);
            BatteryReports
                .insertMany(battriesObjs)
                .then(valueBatteries =>
                    resp.status(status.OK)
                        .json({'respond': 'the document is updated successfully'}))
                .catch(err => {
                    console.log("bulk insert sampleCollection error ", err);

                });

        })
        .catch(err => {
            console.log("bulk insert sampleCollection error ", err);
        });


};

得到回报

reportsController.getAllTodayBatteryReports = function (req, resp) {

    console.log(req.query.batteryBankId, moment().valueOf());
    BatteryReports.aggregate([
        {
            $match: {

                "reportDate": moment().valueOf().toString()
            }
        }
        ,
        {
            $lookup:
                {
                    from: "batteryschemas",
                    localField: "batteryId",
                    foreignField: "batteryId",
                    as: "batteryReports_with_their_info"
                }
        }
        ,
        {
            $match:
                {"batteryReports_with_their_info.batteryBankId": new mongoose.Types.ObjectId(req.query.batteryBankId)}

        }
        ,
        {
            $replaceRoot: {newRoot: {$mergeObjects: [{$arrayElemAt: ["$batteryReports_with_their_info", 0]}, "$$ROOT"]}}
        }
        ,
        {
            $project: {
                batteryReports_with_their_info: 0,
                batteryBrand: 0,
                batteryMaximumChargingCurrent: 0,
                batteryCycleOfCharge: 0,
                batteryModel: 0,
                batteryProductDate: 0,
                batteryInternalResistance: 0,
                batteryCapacity: 0,
                __v: 0
            }
        }


    ], function (err, result) {
        console.log(result);
        if (err) {
            resp.status(status.NOT_FOUND).json({'respond': err + ''});
        } else {

            resp.status(status.OK).json(result);
        }
        // console.log(result);
    });
};

如您所见，我的这部分代码获取当前时间戳并将其放入 MongoDB 匹配方法，但尽管在今天的时间戳中添加了一些数据，但我无法通过当前时间戳值获取这些记录。

$match: {
              "reportDate": moment().valueOf().toString()
        }

样品

 {
        "_id": "5d3c9116ee51fe32b44160f6",
        "batteryId": "1",
        "batteryVoltage": "5.5",
        "batteryVoltageMin": "34",
        "batteryVoltageMax": "34",
        "batteryMinTemperature": "443",
        "batteryMaxTemperature": "43",
        "batteryBankId": "5d29c1469e0e8b3afcf3a1e6",
        "batteryStatus": "H",
        "batteryTemperature": "38",
        "reportDate": "1564250390757"
    }

Answer 1

您可以将moment().valueOf()值分配给对象并将其用于 reportDate。 加上moment().valueOf()将以毫秒为单位为您提供时间戳，然后插入的时间将与查询时间不同，因此您需要进行范围查询以获得特定的记录/文档，或者传递精确的时间戳以获得精确匹配。

假设您今天插入了几个文档，并希望在同一天在给定的时间戳运行您的查询（请注意时间戳属于同一区域）然后，

let currentTimeStamp = moment().valueOf().toString()
let startOfDayTimeStamp = moment().startOf('day').valueOf().toString()

然后，

$match: {
              "reportDate": { $gt: startOfDayTimeStamp, $lt: currentTimeStamp }
        }

如果您正在处理频繁写入的集合，那么您正在处理像这样的读取查询的大量数据，请记住进行适当的索引。