mongoDB文档操作

document文档操作
1、插入文档
db.users.save({name: 'zhangsan', age: 25, sex: 1});
db.users.insert({name: 'zhangsan', age: 25, sex: 1});
插入单条数据 db.users.insertOne({});
插入多条数据db.users.insertMany([{},{}])

2、更新文档
db.users.updaeMany({},{$set:{class:"1638"}})

//false表示如果不存在不会插入，true表示如果有多个内容都更新（如果为false，则只更新第一条）
db.users.update({age: 25}, {$set: {name: 'changeName'}}, false, true);
相当于：update users set name = ‘changeName' where age = 25;
db.users.update({name: 'Lisi'}, {$inc: {age: 50}}, false, true);
相当于：update users set age = age + 50 where name = ‘Lisi';
db.users.update({name: 'Lisi'}, {$inc: {age: 50}, $set: {name: 'hoho'}}, false, true);
相当于：update users set age = age + 50, name = ‘hoho' where name = ‘Lisi';
3、获得当前db的所有文档
查询所有记录
db.userInfo.find();
相当于：select* from userInfo;
查询去重后数据
db.userInfo.distinct("name");
相当于：select distict name from userInfo;
查询age = 22的记录
db.userInfo.find({"age": 22});
相当于： select * from userInfo where age = 22;
查询age > 22的记录
db.userInfo.find({age: {$gt: 22}});
相当于：select * from userInfo where age >22;
查询age < 22的记录
db.userInfo.find({age: {$lt: 22}});
相当于：select * from userInfo where age <22;

查询age >= 25的记录
db.userInfo.find({age: {$gte: 25}});
相当于：select * from userInfo where age >= 25;
查询age <= 25的记录
db.userInfo.find({age: {$lte: 25}});
查询age >= 23 并且 age <= 26
db.userInfo.find({age: {$gte: 23, $lte: 26}});
查询name中包含 mongo的数据
db.userInfo.find({name: /mongo/});
//相当于%%
select * from userInfo where name like ‘%mongo%’;
查询name中以mongo开头的
db.userInfo.find({name: /^mongo/});
select * from userInfo where name like ‘mongo%’;

4、删除文档
db.users.remove({age: 132},true);
删除多条
db.users.deleteMany({class:"1638"})
删除所有
db.users.remove({})
5、简单查询文档
查询指定列name、age数据
db.userInfo.find({}, {name: 1, age: 1});
相当于：select name, age from userInfo;
查询指定列name、age数据, age > 25
db.userInfo.find({age: {$gt: 25}}, {name: 1, age: 1});
相当于：select name, age from userInfo where age >25;
按照年龄排序
升序：db.userInfo.find().sort({age: 1});
降序：db.userInfo.find().sort({age: -1});
查询name = zhangsan, age = 22的数据
db.userInfo.find({name: 'zhangsan', age: 22});
相当于：select * from userInfo where name = ‘zhangsan' and age = ’22';
查询前5条数据
db.userInfo.find().limit(5);
相当于：select top 5 * from userInfo;
查询10条以后的数据
db.userInfo.find().skip(10);
相当于：select * from userInfo where id not in (
select top 10 * from userInfo
);
查询在5-10之间的数据
db.userInfo.find().limit(5).skip(5);
or与 查询
db.userInfo.find({$or: [{age: 22}, {age: 25}]});
相当于：select * from userInfo where age = 22 or age = 25;
查询第一条数据
db.userInfo.findOne();
相当于：selecttop 1 * from userInfo;
db.userInfo.find().limit(1);
查询某个结果集的记录条数
db.userInfo.find({age: {$gte: 25}}).count();
相当于：select count(*) from userInfo where age >= 20;
按照某列进行排序计数
db.userInfo.find({sex: {$exists: true}}).count();
相当于：select count(sex) from userInfo;