使用時間戳節點js從mongodb獲取今天導入的數據

Question

我按當前時間戳將報告添加到 MongoDB 數據庫中，但我無法檢索今天導入的數據，因為當前時間戳與插入數據的時間戳值不同。 如何使用時間戳查看數據？

添加報告

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);
        });


};

得到回報

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);
    });
};

如您所見，我的這部分代碼獲取當前時間戳並將其放入 MongoDB 匹配方法，但盡管在今天的時間戳中添加了一些數據，但我無法通過當前時間戳值獲取這些記錄。

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

樣品

 {
        "_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

您可以將moment().valueOf()值分配給對象並將其用於 reportDate。 加上moment().valueOf()將以毫秒為單位為您提供時間戳，然后插入的時間將與查詢時間不同，因此您需要進行范圍查詢以獲得特定的記錄/文檔，或者傳遞精確的時間戳以獲得精確匹配。

假設您今天插入了幾個文檔，並希望在同一天在給定的時間戳運行您的查詢（請注意時間戳屬於同一區域）然后，

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

然后，

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

如果您正在處理頻繁寫入的集合，那么您正在處理像這樣的讀取查詢的大量數據，請記住進行適當的索引。