How to connect nodejs to mongodb database

This article mainly introduces the method of nodejs to connect to the mongodb database. It analyzes the simple connection, query and closing operation skills of nodejs for the mongodb database in the form of examples. Friends who need it can refer to it. I hope it can help everyone.

var MongoClient = require('mongodb').MongoClient;
var DB_CONN_STR = 'mongodb://zlg:437612lang@110.62.14.243:27017/lj_node';
MongoClient.connect(DB_CONN_STR, function(err, db) {
  if(err){console.log(err)} else{console.log("连接成功！");}
  //连接到表
  var collection = db.collection("lj_node");
 //查询数据
 collection.find().toArray(function(err, result) {
  if(err)
  {
   console.log('Error:'+ err);
   return;
  } else {
    console.log(result[0].name)
  }
  db.close(); //关闭链接
 });
});

mongodb.connect(mongodb_url,function(err,client){//创建链接实例
  if(err)
    console.log(err);
  else{
    var dbname="lj_node";
    var db=client.db(dbname);//创建数据库实例
    var collection = db.collection('lj_node');//创建表实例
    collection.find({}).toArray(function(err, docs) {//查询数据
      console.log(docs)
      client.close();//关闭链接
     });
  }
})

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