mongodb数据查询

连接mongodb；

右键单击数据库，选择Open IntelliShell；

输入查询语句，执行；

1、简单的等于。

    查询geoData集合中，poleInfoID=4的数据。db.geoData.find({poleInfoID:4})  

2、<, <=, >, >= ($lt, $lte, $gt, $gte )

    查询poleInfoID=4且20200320134032032<=synchroID<=20200320134032300的数据。

       db.geoData.find({poleInfoID:4,synchroID: {$gte:20200320134032032},synchroID: {$lte:20200320134032300}})    

       db.geoData.find({poleInfoID:4,synchroID: {$gte:20200320134032032,$lte:20200320134032300}})

3、使用or

     select name, age, skills from users where name = 'hurry' or age = 18;

    db.users.find({ '$or' : [{'name' : 'hurry'}, {'age' : 18}] },{'name' : 1, 'age' : 1, 'skills' : 1});

4、使用in, not in ($in, $nin)

    select * from users where age in (10, 22, 26);

    db.users.find({'age' : {'$in' : [10, 22, 26]}});

5、 匹配null

    select * from users where age is null;

    db.users.find({'age' : null);

6、like (mongoDB 支持正则表达式)

    select * from users where name like "%hurry%";

    db.users.find({name:/hurry/}); 

    select * from users where name like "hurry%";

    db.users.find({name:/^hurry/}); 

7、使用distinct

    select distinct (name) from users;

    db.users.distinct('name');

8、使用count

    select count(*) from users;

    db.users.count();