Node.js MongoDB Sorteer
Sorteer die resultaat
Gebruik die sort()metode om die resultaat in stygende of dalende volgorde te sorteer.
Die sort()metode neem een parameter, 'n objek wat die sorteervolgorde definieer.
Voorbeeld
Sorteer die resultaat alfabeties volgens naam:
var MongoClient = require('mongodb').MongoClient;
var url = "mongodb://localhost:27017/";
MongoClient.connect(url, function(err, db) {
if (err) throw err;
var dbo = db.db("mydb");
var mysort = { name: 1 };
dbo.collection("customers").find().sort(mysort).toArray(function(err, result) {
if (err) throw err;
console.log(result);
db.close();
});
});
Stoor die kode hierbo in 'n lêer genaamd "demo_sort.js" en voer die lêer uit:
Begin "demo_sort.js"
C:\Users\Your Name>node demo_sort.js
Wat vir jou hierdie resultaat sal gee:
[
{
_id: 58fdbf5c0ef8a50b4cdd9a86, name: 'Amy',
address: 'Apple st 652'},
{ _id: 58fdbf5c0ef8a50b4cdd9a8e, name: 'Ben', address: 'Park Lane 38'},
{
_id: 58fdbf5c0ef8a50b4cdd9a8a,
name: 'Betty', address: 'Green Grass 1'},
{ _id: 58fdbf5c0ef8a50b4cdd9a90, name: 'Chuck', address:
'Main Road 989'},
{ _id: 58fdbf5c0ef8a50b4cdd9a87, name: 'Hannah', address:
'Mountain 21'},
{ _id:
58fdbf5c0ef8a50b4cdd9a84, name: 'John', address: 'Highway 71'},
{ _id: 58fdbf5c0ef8a50b4cdd9a88, name: 'Michael', address: 'Valley 345'},
{ _id:
58fdbf5c0ef8a50b4cdd9a85, name: 'Peter', address: 'Lowstreet 4'},
{ _id:
58fdbf5c0ef8a50b4cdd9a8b, name: 'Richard',
address: 'Sky st 331'},
{ _id: 58fdbf5c0ef8a50b4cdd9a89, name: 'Sandy', address: 'Ocean blvd 2'},
{ _id: 58fdbf5c0ef8a50b4cdd9a8c, name: 'Susan', address: 'One way
98'},
{ _id: 58fdbf5c0ef8a50b4cdd9a8d, name: 'Vicky', address: 'Yellow Garden 2'},
{ _id: 58fdbf5c0ef8a50b4cdd9a91, name: 'Viola', address: 'Sideway
1633'},
{
_id: 58fdbf5c0ef8a50b4cdd9a8f, name: 'William',
address: 'Central st 954'}
]
Sorteer aflopend
Gebruik die waarde -1 in die sorteervoorwerp om dalend te sorteer.
{ naam: 1 } // stygende
{ naam: -1 } // dalende
Voorbeeld
Sorteer die resultaat omgekeerd alfabeties volgens naam:
var MongoClient = require('mongodb').MongoClient;
var url = "mongodb://localhost:27017/";
MongoClient.connect(url, function(err, db) {
if (err) throw err;
var dbo = db.db("mydb");
var mysort = { name: -1 };
dbo.collection("customers").find().sort(mysort).toArray(function(err, result) {
if (err) throw err;
console.log(result);
db.close();
});
});
Stoor die kode hierbo in 'n lêer genaamd "demo_sort_desc.js" en voer die lêer uit:
Begin "demo_sort_desc.js"
C:\Users\Your Name>node demo_sort_desc.js
Wat vir jou hierdie resultaat sal gee:
[
{
_id: 58fdbf5c0ef8a50b4cdd9a8f, name: 'William',
address: 'Central st 954'},
{ _id: 58fdbf5c0ef8a50b4cdd9a91, name: 'Viola', address: 'Sideway
1633'},
{ _id: 58fdbf5c0ef8a50b4cdd9a8d, name: 'Vicky', address: 'Yellow Garden 2'},
{ _id: 58fdbf5c0ef8a50b4cdd9a8c, name: 'Susan', address: 'One way
98'},
{ _id: 58fdbf5c0ef8a50b4cdd9a89, name: 'Sandy', address: 'Ocean blvd 2'},
{ _id:
58fdbf5c0ef8a50b4cdd9a8b, name: 'Richard',
address: 'Sky st 331'},
{ _id:
58fdbf5c0ef8a50b4cdd9a85, name: 'Peter', address: 'Lowstreet 4'},
{ _id: 58fdbf5c0ef8a50b4cdd9a88, name: 'Michael', address: 'Valley 345'},
{ _id:
58fdbf5c0ef8a50b4cdd9a84, name: 'John', address: 'Highway 71'},
{ _id: 58fdbf5c0ef8a50b4cdd9a87, name: 'Hannah', address:
'Mountain 21'},
{ _id: 58fdbf5c0ef8a50b4cdd9a90, name: 'Chuck', address:
'Main Road 989'},
{
_id: 58fdbf5c0ef8a50b4cdd9a8a,
name: 'Betty', address: 'Green Grass 1'},
{ _id: 58fdbf5c0ef8a50b4cdd9a8e, name: 'Ben', address: 'Park Lane 38'},
{
_id: 58fdbf5c0ef8a50b4cdd9a86, name: 'Amy',
address: 'Apple st 652'}
]