MongoDB再帰、集約、ネストテスト

1.再帰テスト

≪テスト・ターゲット|Test Targets|emdw≫:ユーザーのすべてのサブユーザーを再帰的に問合せます.テスト環境:MongoDB 3.2.0
テストデータの挿入

db.categories.insert({_id: "MongoDB", parent: "Databases" } )
db.categories.insert({_id: "dbm", parent: "Databases" } )
db.categories.insert({_id: "Databases", parent: "Programming" } )
db.categories.insert({_id: "Languages", parent: "Programming" } )
db.categories.insert( { _id: "Programming", parent: "Books" } )
db.categories.insert( { _id: "Books", parent: null } )

Programmingの子孫を読み込む

function findChildren(parent) {
     var myCursor = db.categories.find({"parent":parent});
     while(myCursor.hasNext()) {
          var myJsonString = tojson(myCursor.next());
          print(myJsonString);
          var myJsonObject = JSON.parse(myJsonString);
          findChildren(myJsonObject._id); 
     }
}
findChildren("Programming");

2.集約テスト

統計サイクルとデバイスリストを指定し、デバイスデータを統計します.

db.car.insert({deviceId:'111111',fuelConsum:5,mileage:1000,createTime:"2011-10-29 0:0:1"})
db.car.insert({deviceId:'222222',fuelConsum:6,mileage:2000,createTime:"2012-10-29 0:0:1"})
db.car.insert({deviceId:'333333',fuelConsum:7,mileage:3000,createTime:"2013-10-29 0:0:1"})
db.car.insert({deviceId:'444444',fuelConsum:8,mileage:4000,createTime:"2014-10-29 0:0:1"})
db.car.insert({deviceId:'555555',fuelConsum:9,mileage:5000,createTime:"2015-10-29 0:0:1"})
db.car.insert({deviceId:'666666',fuelConsum:10,mileage:6000,createTime:"2016-10-29 0:0:1"})

統計平均燃費統計周期:2012-2016年統計設備リスト:["111111","222222","333333","444444","555555"]

var deviceList = ["111111","222222","333333", "444444", "555555"];
db.car.aggregate([
  {$match:{"$and":[
    {"createTime":{"$gt":"2012-1-1 0:0:0"}},
    {"createTime":{"$lt":"2016-12-31 0:0:0"}},
    {"deviceId":{$in:deviceList}}]}},
  {$group:{_id:null,avg_fuel:{$avg:"$fuelConsum"}}}
])