mongo db linux查詢

1.進入mongodb安裝目錄（>cd D:\workPrograms\mongodb\bin）

2.>mongodb   啟動mongo db

3.>show dbs;   查詢所有數據庫

4.>use test;   選擇要查詢的數據庫，此處若test數據庫不存在會自動創建test數據庫

5.在users collection中插入6條用戶數據

>db.users.insertMany(

  [
     {
       _id: 1,
       name: "sue",
       age: 19,
       type: 1,
       status: "P",
       favorites: { artist: "Picasso", food: "pizza" },
       finished: [ 17, 3 ],
       badges: [ "blue", "black" ],
       points: [
          { points: 85, bonus: 20 },
          { points: 85, bonus: 10 }
       ]
     },
     {
       _id: 2,
       name: "bob",
       age: 42,
       type: 1,
       status: "A",
       favorites: { artist: "Miro", food: "meringue" },
       finished: [ 11, 25 ],
       badges: [ "green" ],
       points: [
          { points: 85, bonus: 20 },
          { points: 64, bonus: 12 }
       ]
     },
     {
       _id: 3,
       name: "ahn",
       age: 22,
       type: 2,
       status: "A",
       favorites: { artist: "Cassatt", food: "cake" },
       finished: [ 6 ],
       badges: [ "blue", "red" ],
       points: [
          { points: 81, bonus: 8 },
          { points: 55, bonus: 20 }
       ]
     },
     {
       _id: 4,
       name: "xi",
       age: 34,
       type: 2,
       status: "D",
       favorites: { artist: "Chagall", food: "chocolate" },
       finished: [ 5, 11 ],
       badges: [ "red", "black" ],
       points: [
          { points: 53, bonus: 15 },
          { points: 51, bonus: 15 }
       ]
     },
     {
       _id: 5,
       name: "xyz",
       age: 23,
       type: 2,
       status: "D",
       favorites: { artist: "Noguchi", food: "nougat" },
       finished: [ 14, 6 ],
       badges: [ "orange" ],
       points: [
          { points: 71, bonus: 20 }
       ]
     },
     {
       _id: 6,
       name: "abc",
       age: 43,
       type: 1,
       status: "A",
       favorites: { food: "pizza", artist: "Picasso" },
       finished: [ 18, 12 ],
       badges: [ "black", "blue" ],
       points: [
          { points: 78, bonus: 8 },
          { points: 57, bonus: 7 }
       ]
     }
  ]
)

6.>db.users.find(); 查詢users里的所有數據

7.>db.users.find({status: 'A'}); 查詢users里status等於A的數據

8.>db.users.find({age:{$gt:22}}); 查詢users里年齡大於22的數據

9.> db.users.find({status: 'D', age: {$gt: 23}}); 查詢users里狀態為D並且年齡大於23的數據

10.>db.users.find({$or: [{status: 'A'}, {age: {$gt: 23}}]}); 查詢users里狀態為A或者年齡大於23的數據

11.>db.users.find( { favorites: { artist: "Picasso", food: "pizza" } } ); 嵌套查詢，匹配整個子文檔，查詢favorites里artist為Picasso，food為pizza的用戶

12.>db.users.find( { "favorites.artist": "Picasso" } );  嵌套查詢，匹配子文檔中的字段，通過點(.)符號來表示子文檔中的字段

13.>db.users.find( { badges: [ "blue", "black" ] } ); 數組查詢，匹配所有數組，查找badges的值為"['blue', 'black']"的用戶

14.>db.users.find( { badges: "black" } )； 數組查詢，查詢數組中的一個元素，查找badges的數組中包含了'black'元素的所有用戶

15.> db.users.find( { finished: { $elemMatch: { $gt: 15, $lt: 20 } } } ); 數組多條件and查詢（$elemMatch），$elemMatch多個條件and匹配，假設我們要找到滿足finished字段中的數組元素的值大於15並且小於20

      結果：{ "_id" : 1, ..., "finished" : [ 17, 3 ] ,...}

　　　　 { "_id" : 6, ..., "finished" : [ 18, 12 ], ...}

16.>db.users.find( { finished: { $gt: 15, $lt: 20 } } );  數組多條件or查詢，查詢大於15或者小於20的數據

    結果：{ "_id" : 1,..., "finished" : [ 17, 3 ], ...}

　　　　{ "_id" : 2, ..., "finished" : [ 11, 25 ], ...}
　　　　{ "_id" : 6, ..., "finished" : [ 18, 12 ], ...}

17.>db.users.find( { 'points.0.points': { $lte: 55 } } ); 使用數組下標定位集合子文檔，查詢數組中第一個points的值，小於等於55的數據

18.>db.users.find( { 'points.points': { $lte: 55 } } ); 省略下標，查詢points數組中所有的points的值小於等於55的數據

19.> db.users.find( { points: { $elemMatch: { points: { $lte: 70 }, bonus: 20 } } } )； 多條件and查詢（$elemMatch），查詢points數組中points的值小於等於70並且bonus為20的數據

     結果：{ "_id" : 3, ....,"points" : [ { "points" : 81, "bonus" : 8 }, { "points" : 55, "bonus" : 20 } ] }

20.>db.users.find({"points.points": {$lte: 70}, "points.bonus": 20}); 多條件or查詢， 查詢points數組中，points的值小於等於70或者bonus為20的數據

      結果：{ "_id" : 2, ..., "points" : [ { "points" : 85, "bonus" : 20 }, { "points" : 64, "bonus" : 12 } ] }

　　　　{ "_id" : 3, ..., "points" : [ { "points" : 81, "bonus" : 8 }, { "points" : 55, "bonus" : 20 } ] }

 

 

參考資料地址：https://www.linuxidc.com/Linux/2016-10/136581.htm