安装指令：npm install mongodb
var mongodb = require("mongodb");
// console.log(mongodb);
var MongoClient = mongodb.MongoClient;
var CONN_DB_STR = "mongodb://localhost:27017/wh1807";
MongoClient.connect(CONN_DB_STR,(err,db)=>{
if(err) throw err;
console.log("数据库链接成功...");
console.log(db);
var movie = db.collection("movie");
movie.find({},{title:1,year:1,genres:1,_id:0}).toArray((err,result)=>{
if(err) throw err;
console.log("查询成功++++++++++++++++++++++++++++");
console.log(result);
});
// var collections = db.getCollectionNames(); error
// console.log(collections);
db.collection("user").insert({username:"helloNode",password:"daydayup"},(err,result)=>{
if(err) throw err;
console.log("insert ++++++++++++++++++++++++++++");
console.log(result);
})
db.collection("user").updateMany(
{username:"helloNode"},
{
$set:{age:40,password:"666666"}
},
(err,result)=>{
if(err) throw err;
console.log("update ++++++++++++++++++++++++++++");
console.log(result);
}
)
db.collection(‘user‘).deleteOne({username:"helloNode"},(err,result)=>{
if(err) throw err;
console.log("deleteOne ++++++++++++++++++++++++++++");
console.log(result);
});
db.close(); // 关闭数据库
})
补充菜鸟教程：（1）创建连接var MongoClient = require(‘mongodb‘).MongoClient;var url = "mongodb://localhost:27017/runoob";MongoClient.connect(url, { useNewUrlParser: true }, function(err, db) { if (err) throw err; console.log("数据库已创建!"); db.close();});（2）创建集合var MongoClient = require(‘mongodb‘).MongoClient;var url = ‘mongodb://localhost:27017/runoob‘;MongoClient.connect(url, { useNewUrlParser: true }, function (err, db) { if (err) throw err; console.log(‘数据库已创建‘); var dbase = db.db("runoob"); dbase.createCollection(‘site‘, function (err, res) { if (err) throw err; console.log("创建集合!"); db.close(); });});（3）插入一条数据var MongoClient = require(‘mongodb‘).MongoClient;var url = "mongodb://localhost:27017/";MongoClient.connect(url, { useNewUrlParser: true }, function(err, db) { if (err) throw err; var dbo = db.db("runoob"); var myobj = { name: "菜鸟教程", url: "www.runoob" }; dbo.collection("site").insertOne(myobj, function(err, res) { if (err) throw err; console.log("文档插入成功"); db.close(); });});（4）插入多条数据var MongoClient = require(‘mongodb‘).MongoClient;var url = "mongodb://localhost:27017/";MongoClient.connect(url, { useNewUrlParser: true }, function(err, db) { if (err) throw err; var dbo = db.db("runoob"); var myobj = [ { name: ‘菜鸟工具‘, url: ‘https://c.runoob.com‘, type: ‘cn‘}, { name: ‘Google‘, url: ‘https://www.google.com‘, type: ‘en‘}, { name: ‘Facebook‘, url: ‘https://www.google.com‘, type: ‘en‘} ]; dbo.collection("site").insertMany(myobj, function(err, res) { if (err) throw err; console.log("插入的文档数量为: " + res.insertedCount); db.close(); });});（5）删除一条数据var MongoClient = require(‘mongodb‘).MongoClient;var url = "mongodb://localhost:27017/";MongoClient.connect(url, { useNewUrlParser: true }, function(err, db) { if (err) throw err; var dbo = db.db("runoob"); var whereStr = {"name":‘菜鸟教程‘}; // 查询条件 dbo.collection("site").deleteOne(whereStr, function(err, obj) { if (err) throw err; console.log("文档删除成功"); db.close(); });});（6）排序var MongoClient = require(‘mongodb‘).MongoClient;var url = "mongodb://localhost:27017/";MongoClient.connect(url, { useNewUrlParser: true }, function(err, db) { if (err) throw err; var dbo = db.db("runoob"); var mysort = { type: 1 }; dbo.collection("site").find().sort(mysort).toArray(function(err, result) { if (err) throw err; console.log(result); db.close(); });});（7）删除集合var MongoClient = require(‘mongodb‘).MongoClient;var url = "mongodb://localhost:27017/";MongoClient.connect(url, { useNewUrlParser: true }, function(err, db) { if (err) throw err; var dbo = db.db("runoob"); // 删除 test 集合 dbo.collection("test").drop(function(err, delOK) { // 执行成功 delOK 返回 true，否则返回 false if (err) throw err; if (delOK) console.log("集合已删除"); db.close(); });});