Question

{
    "_id" : ObjectId("54ec60dae4b07e1ee10a899d"),
    "_class" : "com.lybrate.core.phoenix.event.PhxEventTracking",
    "rfpId" : "198163",
    "eventType" : "QnA",
    "eventId" : "49548",
    "paramType" : "S",
    "timestamp" : NumberLong("1424777434982"),
    "utm_source" : "email",
    "utm_medium" : "gw",
    "utm_content" : "null",
    "utm_term" : "null",
    "utm_campaign" : "Email_050215_gw_askq",
    "referrer" : "https://www.lybrate.com/questions/ask",
    "source" : "PS-AQP",
    "e_stat" : "rejected ",
    "a_time" : NumberLong("1424802600000"),
    "newdDate" : ISODate("0NaN-NaN-NaNTNaN:NaN:NaNZ"),
    "newDate" : ISODate("2015-03-27T08:32:31.679Z")
}

我有这个MongoDB文档，我想将newDate更新为db中的timestamp值我正在使用单个mongodb查询，如下所示

db.phxEventTracking.update({"eventType":"QnA"},{$set:{newDate:new ISODate(this.timestamp)}},{upsert:false,multi:true})

但是这会将newDate更新为当前时间而不是timestamp的dateTime值...答案将不胜感激...谢谢和问候......：）

Answer 1

我已仔细检查了您的代码的功能，看来，当您传递this.timestamp参数时，this将引用全局范围（类似于window在JavaScript中。）

我还尝试在集合中插入随机元素，使用各种变量名而不是时间戳：

db.test.insert({ date: new ISODate(this.variable1) });

db.test.insert({ date: new ISODate(this.variable2) });

由于这些变量未定义，ISODate包装器会解释没有传递参数，因此调用new ISODate()，返回当前时间戳。

以下是ISODate function shell中记录的mongo的代码：

function (isoDateStr){
    if (!isoDateStr)
        return new Date();

    var isoDateRegex = /(\d{4})-?(\d{2})-?(\d{2})([T ](\d{2})(:?(\d{2})(:?(\d{2}(\.\d+)?))?)?(Z|([+-])(\d{2}):?(\d{2})?)?)?/;
    var res = isoDateRegex.exec(isoDateStr);

    if (!res)
        throw "invalid ISO date";

    var year = parseInt(res[1],10) || 1970; // this should always be present
    var month = (parseInt(res[2],10) || 1) - 1;
    var date = parseInt(res[3],10) || 0;
    var hour = parseInt(res[5],10) || 0;
    var min = parseInt(res[7],10) || 0;
    var sec = parseInt((res[9] && res[9].substr(0,2)),10) || 0;
    var ms = Math.round((parseFloat(res[10]) || 0) * 1000);
    if (ms == 1000) {
        ms = 0;
        ++sec;
    }
    if (sec == 60) {
        sec = 0;
        ++min;
    }
    if (min == 60) {
        min = 0;
        ++hour;
    }
    if (hour == 24) {
        hour = 0;   // the day wrapped, let JavaScript figure out the rest
        var tempTime = Date.UTC(year, month, date, hour, min, sec, ms);
        tempTime += 24 * 60 * 60 * 1000;    // milliseconds in a day
        var tempDate = new Date(tempTime);
        year = tempDate.getUTCFullYear();
        month = tempDate.getUTCMonth();
        date = tempDate.getUTCDate();
    }

    var time = Date.UTC(year, month, date, hour, min, sec, ms);

    if (res[11] && res[11] != 'Z'){
        var ofs = 0;
        ofs += (parseInt(res[13],10) || 0) * 60*60*1000; // hours
        ofs += (parseInt(res[14],10) || 0) *    60*1000; // mins
        if (res[12] == '+') // if ahead subtract
            ofs *= -1;

        time += ofs
    }

    return new Date(time);
}

Mongodb从现有文档更新到目前为止的时间戳

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