Node.js操作MongoDB数据库实例分析

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：

https://www.npmjs.com/package/mongodb
https://www.jb51.net/article/58815.htm
https://www.jb51.net/article/98813.htm

希望本文所述对大家node.js程序设计有所帮助。