如何在mongodb中找到经纬度附近的地方？

问题描述

对mongodb和golang很新颖。我有一个名为myplace的集合它具有以下文件place_name，city，latitude，longitude。我的问题是用户在某个地方搜索附近的地方。我如何查询mongodb以便按位置查找。

我的文档结构

  {
_id：ObjectId（544a2147785b707b340ed6c7），
latitude：12.36547，
longitude：1.235689，
place_name：some_place，
city ：某城市
} 
  

预先致谢 $ b $ code> {
_id：ObjectId（545749dba2b0b4cf603a7546），
city：B，
placeName：A，
loc：{
lon：51.10682735591432，
lat：-114.11773681640625
}
}
{
_id：ObjectId（ 545749f3a2b0b4cf603a7547），
city：B1，
placeName：A1，
loc：{
lon：51.09144802136697，
lat：-114.11773681640625
}
}

在索引以上做如下所示：

  db.collectionName.ensureIndex（{loc：2d}）
  

如果索引执行正确，然后编写下面的查询以查找文档附近的内容

  db.location.find（{loc：{$ near：[51，-114]}}）
  

有更多的帮助，你应该参考这个mongo $ near和$ geoNear

对于golang抱歉，因为我对golang没有更多了解

for golang

  var places [] Place 
 lat：= 51.515614 
 long：=  - 0.268998 
 err = coll.Find（bson.M {loc：bson.M {$ near：[] float64 {long，lat}，$ maxDistance：0.056}}）。 ;地点）
  

Am very new to mongodb and golang. I have a collection named "myplace" It has the following fileds place_name, city, latitude, longitude. My question is user in some place and searching the nearby places. How can I query to mongodb to find near by locations. Also in golang.

My doc structure

{
    "_id" : ObjectId("544a2147785b707b340ed6c7"),
    "latitude" : 12.36547,
    "longitude" : 1.235689,
    "place_name" : "some_place",
    "city" : "Some city"
}

Thanks in advance

解决方案

Hi For your case I think you should changed above doc as below

    {
    "_id" : ObjectId("545749dba2b0b4cf603a7546"),
    "city" : "B",
    "placeName" : "A",
    "loc" : {
        "lon" : 51.10682735591432,
        "lat" : -114.11773681640625
    }
}
{
    "_id" : ObjectId("545749f3a2b0b4cf603a7547"),
    "city" : "B1",
    "placeName" : "A1",
    "loc" : {
        "lon" : 51.09144802136697,
        "lat" : -114.11773681640625
    }
}

After that indexing the above documents as below

db.collectionName.ensureIndex({loc:"2d"})

If indexing executing properly then write following query to find out near by documents

db.location.find({loc: {$near:[51,-114]}})

for more help you should refer this mongo $near and $geoNear click here

and sorry for golang because I don't know more about golang

for golang

var places []Place
lat := 51.515614
long := -0.268998
err = coll.Find(bson.M{"loc": bson.M{"$near": []float64{long, lat}, "$maxDistance" :      0.056}}).All(&places)

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