Node.js操作MongoDB数据库实例分析

本文实例讲述了node.js操作mongodb数据库。分享给大家供大家参考，具体如下：

node.js操作mongodb

npm init
npm i mongodb --save

{
 "name": "test",
 "version": "1.0.0",
 "description": "",
 "main": "app.js",
 "scripts": {
  "test": "echo \"error: no test specified\" && exit 1"
 },
 "author": "",
 "license": "isc",
 "dependencies": {
  "mongodb": "^3.1.1"
 }
}

连接数据库

// connect.js
const mongoclient = require('mongodb').mongoclient;
// connection url
const url = 'mongodb://localhost:27017';
// database name
const dbname = 'mydatabase';
// use connect method to connect to the server
mongoclient.connect(url, { usenewurlparser: true }, function(err, client) {
 console.log("connected successfully to server");
 const db = client.db(dbname);
 client.close();
});

插入

// insert.js
const mongoclient = require('mongodb').mongoclient;
// connection url
const url = 'mongodb://localhost:27017';
// database name
const dbname = 'mydatabase';
// 插入
var insertdata = function (db, callback) {
 // 获取文档集合
 var collection = db.collection('collection3');
 var data = [{"name": "李二狗001", "age": 20}, {"name": "李二狗002", "age": 21}];
 // 插入文档
 collection.insert(data, function (err, result) {
  if(err) {
   console.log('error: ' + err);
   return;
  }
  callback(result);
 })
}
// use connect method to connect to the server
mongoclient.connect(url, { usenewurlparser: true }, function(err, client) {
 console.log("connected successfully to server");
 const db = client.db(dbname);
 insertdata(db, function (result) {
  console.log(result);
  client.close();
 });
});

查询

// find.js
const mongoclient = require('mongodb').mongoclient;
// connection url
const url = 'mongodb://localhost:27017';
// database name
const dbname = 'mydatabase';
// 查询
var finddata = function (db, callback) {
 // 获取文档集合
 var collection = db.collection('collection3');
 var wherestr = {"name": "李二狗001"};
 // 查询文档
 collection.find(wherestr).toarray(function (err, result) {
  if(err) {
   console.log('error: ' + err);
   return;
  }
  callback(result);
 })
}
// use connect method to connect to the server
mongoclient.connect(url, { usenewurlparser: true }, function(err, client) {
 console.log("connected successfully to server");
 const db = client.db(dbname);
 finddata(db, function (result) {
  console.log(result);
  client.close();
 })
});

修改

// update.js
const mongoclient = require('mongodb').mongoclient;
// connection url
const url = 'mongodb://localhost:27017';
// database name
const dbname = 'mydatabase';
// 修改
var updatedata = function (db, callback) {
 // 获取文档集合
 var collection = db.collection('collection3');
 var wherestr = {"name": "李二狗002"};
 var updatestr = {$set: {"age": 100}};
 // 修改文档
 collection.update(wherestr, updatestr, function (err, result) {
  if(err) {
   console.log('error: ' + err);
   return;
  }
  callback(result);
 })
}
// use connect method to connect to the server
mongoclient.connect(url, { usenewurlparser: true }, function(err, client) {
 console.log("connected successfully to server");
 const db = client.db(dbname);
 updatedata(db, function (result) {
  console.log(result);
  client.close();
 })
});

删除

// delete.js
const mongoclient = require('mongodb').mongoclient;
// connection url
const url = 'mongodb://localhost:27017';
// database name
const dbname = 'mydatabase';
// 删除
var deldata = function (db, callback) {
 // 获取文档集合
 var collection = db.collection('collection3');
 var wherestr = {"name": "李二狗002"};
 // 删除文档
 collection.remove(wherestr, function (err, result) {
  if(err) {
   console.log('error: ' + err);
   return;
  }
  callback(result);
 })
}
// use connect method to connect to the server
mongoclient.connect(url, { usenewurlparser: true }, function(err, client) {
 console.log("connected successfully to server");
 const db = client.db(dbname);
  deldata(db, function (result) {
  console.log(result);
  client.close();
 })
});

参考：

希望本文所述对大家node.js程序设计有所帮助。