Mongodb sort function

Sorting function

cursor.sort({
    field: ordering, ...}):  Sort according to the specified rules 
ordering by 1 Indicates ascending sort 
ordering by -1 Represents a descending sort 

Example

// Be careful : By default find Method only returns 100 A document

db.person.find()
db.person.insert({
    name:'itzb', age:15})
db.person.find().limit(101)
db.person.find().sort({
    age:1})
db.person.find().sort({
    age:-1})

Be careful

3.1find Method will only fetch by default 100 A document
3.2sort The function always executes before the paging function

db.person.find().skip(5).limit(5)
db.person.find().skip(5).limit(5).sort({
    age:-1})

code:

show databases;
use usser;
show collections;

db.person.find()

db.person.insertOne({
    name:'itzb',age:12})

// Be careful : By default find Method only returns 100 A document 
// Returns the specified quantity :
db.person.find().limit(500)
// Specify the ascending order of age 
db.person.find().sort({
    age:1}).limit(200)
// Specify the descending order of age 
db.person.find().sort({
    age:-1}).limit(200)

Be careful :sort Function if and limit,skip When used together , No matter what sort Before or after , Will execute first sort function