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MongoDB Aggregation LBS查詢:找捷運台北車站附近距離2公里內的捷運站、依照建立時間做排序、找前3筆資料
// 找捷運台北車站附近距離2公里內的捷運站、依照建立時間做排序、找前3筆資料
db.lbs_test.aggregate(
{
$geoNear : {
near : [25.046084,121.517542],
distanceField : "dist",
maxDistance : 2 / 111.12
}
},
{
$sort : {
time : 1
}
},
{
$limit : 3
}
);
// 查詢結果
{
"result" : [
{
"_id" : ObjectId("5238179cdfba7ac818bb5fcd"),
"name" : "捷運臺大醫院站",
"loc" : {
"lat" : 25.041535,
"long" : 121.516029
},
"time" : 11,
"dist" : 0.004794013975784349
},
{
"_id" : ObjectId("5238179cdfba7ac818bb5fce"),
"name" : "捷運中正紀念堂站",
"loc" : {
"lat" : 25.032922,
"long" : 121.518481
},
"time" : 12,
"dist" : 0.01319545243635133
},
{
"_id" : ObjectId("5238179cdfba7ac818bb5fd2"),
"name" : "捷運中山站",
"loc" : {
"lat" : 25.052596,
"long" : 121.520327
},
"time" : 16,
"dist" : 0.0070825397280881355
}
],
"ok" : 1
}
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