mongodb - Counting number of records that where date is in date range? -


i have collection documents below:

{startdate: isodate("2016-01-02t00:00:00z"), enddate: isodate("2016-01-05t00:00:00z")}, {startdate: isodate("2016-01-02t00:00:00z"), enddate: isodate("2016-01-08t00:00:00z")}, {startdate: isodate("2016-01-05t00:00:00z"), enddate: isodate("2016-01-08t00:00:00z")}, {startdate: isodate("2016-01-05t00:00:00z"), enddate: isodate("2016-01-10t00:00:00z")}, {startdate: isodate("2016-01-07t00:00:00z"), enddate: isodate("2016-01-10t00:00:00z")}

i return record every date between minimum startdate , maximum enddate. along each of these records return count of number of records startdate , enddate contain date.

so above example min startdate 1/2/2016 , max enddate 1/10/2016 return dates between 2 along counts. see desired output below:

{date: isodate("2016-01-02t00:00:00z"), count: 2} {date: isodate("2016-01-03t00:00:00z"), count: 2} {date: isodate("2016-01-04t00:00:00z"), count: 2} {date: isodate("2016-01-05t00:00:00z"), count: 4} {date: isodate("2016-01-06t00:00:00z"), count: 3} {date: isodate("2016-01-07t00:00:00z"), count: 4} {date: isodate("2016-01-08t00:00:00z"), count: 4} {date: isodate("2016-01-09t00:00:00z"), count: 2} {date: isodate("2016-01-010t00:00:00z"), count: 2}

please let me know if doesn't make sense , can try explain in more detail.

i able using loop below:

var startdate = isodate("2016-01-02t00:00:00z") var enddate = isodate("2016-02-10t00:00:00z") while(startdate < enddate){   var counts = db.data.find(       {         startdate: {$lte: startdate},         enddate: {$gte: startdate}       }     ).count()   print(startdate, counts)   startdate.setdate(startdate.getdate() + 1) }

but i'm wondering if there way using aggregation framework? come sql background looping data bad idea. same rule apply mongodb? should concerned using looping here , try use aggregation framework or valid solution?

your best bet here mapreduce. because can loop values in between "startdate" , "enddate" within each document , emit each day ( or other required interval ) between values. matter of accumulating per emitted date key data:

db.collection.mapreduce(     function() {         for( var d = this.startdate.valueof(); d <= this.enddate.valueof(); d += 1000 * 60 * 60 * 24 ) {             emit(new date(d), 1)         }     },     function(key,values) {         return array.sum(values);     },     { "out": { "inline": 1 } } )

this produces results this:

{         "results" : [                 {                         "_id" : isodate("2016-01-02t00:00:00z"),                         "value" : 2                 },                 {                         "_id" : isodate("2016-01-03t00:00:00z"),                         "value" : 2                 },                 {                         "_id" : isodate("2016-01-04t00:00:00z"),                         "value" : 2                 },                 {                         "_id" : isodate("2016-01-05t00:00:00z"),                         "value" : 4                 },                 {                         "_id" : isodate("2016-01-06t00:00:00z"),                         "value" : 3                 },                 {                         "_id" : isodate("2016-01-07t00:00:00z"),                         "value" : 4                 },                 {                         "_id" : isodate("2016-01-08t00:00:00z"),                         "value" : 4                 },                 {                         "_id" : isodate("2016-01-09t00:00:00z"),                         "value" : 2                 },                 {                         "_id" : isodate("2016-01-10t00:00:00z"),                         "value" : 2                 }         ],         "timemillis" : 35,         "counts" : {                 "input" : 5,                 "emit" : 25,                 "reduce" : 9,                 "output" : 9         },         "ok" : 1 }

your dates rounded day in sample, if not in real data simple matter of date math applied in order round per interval.


Comments

Post a Comment

Popular posts from this blog

javascript - jQuery: Add class depending on URL in the best way -

i have html progress meter: <div class="col-md-3" style="margin-left: -20px;"> <div class="progress-pos active" id="progess-1"> <div class="progress-pos-inner"> login </div> </div> </div> <div class="col-md-3 progress-pos-container"> <div class="progress-pos" id="progess-2"> <div class="progress-pos-inner"> scan items </div> </div> </div> <div class="col-md-3 progress-pos-container"> <div class="progress-pos" id="progess-3"> <div class="progress-pos-inner"> confirm address </div> </div> </div> <div class="col-md-3 progress-pos-container"> <div class="progress-pos" id="progess-4"> <div class="progress-pos-in...
Read more

caching - How to check if a url path exists in the service worker cache -

i need check if particular url path exists in service worker cache. example, suppose url is: /myserviceworker/service?a=110&b=70 this url exists in cache, there many of them different values of , b. now, suppose want refresh of these urls, how can that? i want know how access key values service worker cache. if know key, plan follows: var url = new url(key); if(url.pathname === "\/myserviceworker/service") refetch key but not sure how cache key , in format is. mean, string or url? cache api has match() method returns promise resolving in response object if match or undefined if no match exists. second parameter object can specify ignoresearch not take account url parameters. the ignoresearch option supported firefox ( chrome status here ). in other hand, retrieve cache entries, can use keys() method.
Read more

Redirect to a HTTPS version using .htaccess -

i need modify .htaccess file redirect urls https version without "www". http://example.com --> https://example.com http://www.example.com --> https://example.com https://www.example.com --> https://example.com this how .htaccess file looks like: rewriteengine on rewritecond %{request_filename} !-d rewritecond %{request_filename} !-f rewriterule ^(.*)$ redirect.php?id=$1&page=$2 [qsa,l] what modifications need make .htaccess in order forward https without "www"? it depends on doing current code. looks file called redirect trying display php page seo friendly url. think might confusing people. anyway, need , force https without www, need 1 more rule above. also second rule needs two capture groups in rewriterule test string because wanting 2 different values using $1 , $2 references. rewriteengine on #rediect www non www and/or http https --- combinations. rewritecond %{http_host} !^example\.com [nc,or] rewritecond %{https} !^...
Read more