node.js服务器+mongodb数据库(重拾)

1、node-express启动服务器

node app

127.0.0.1:3000  打开浏览器ok的话就启动成功(在public文件夹放个index.html)

加上了es6和热更新，npm start

package.json

"scripts": {
    "test": "echo "Error: no test specified" && exit 1",
    "start": "nodemon app.js --exec babel-node --presets env"
  },

"dependencies": {
    "express": "^4.16.2"
  },
  "devDependencies": {
    "babel-cli": "^6.26.0",
    "babel-preset-env": "^1.6.1",
    "babel-preset-es2015": "^6.24.1",
    "babel-preset-stage-2": "^6.24.1",
    "nodemon": "^1.12.1"
  },

2、接口测试

前端

          var params={name:'hhl',psd:'123456'};
          let out=Axios.get('/login',{params:params});
          out.then((res) => {
            //console.log(res);
            console.log(res.data);// {name: "hhl", psd: "123456"}
          })

后端

app.js

app.use('/login',require('./routes/login'));

routes

router.get('/', function(req, res) {
  res.json(req.query);
});

get方法用query，post方法用body，新手要注意还其他设置let bodyParser = require('body-parser');等

3、启动数据库服务器

 教程见http://www.cnblogs.com/huangxincheng/archive/2012/02/18/2356595.html

mongodb安装后，网上下载比较麻烦，稍后放个地址

cmd==> bin目录下，mongod --dbpath=(数据存放的目录)

回车后，有27012，浏览器打开ok

操作数据库，查看bin目录下mongo

4、node.js与服务器相连接

npm安装mongodb

这边很奇怪了，跟之前的.open()  .collection() 方法都无效了

原来是版本问题，3.0上版本不知为啥不行，好像是针对其他系统的吧，我用的windows系统，然后看了官网的快速https://www.npmjs.com/package/mongodb

一下ok

"dependencies": {
    "express": "^4.16.2",
    "mongodb": "^2.0.55"
  },

这边我取消了用open，collection用了

db.js

//var mongo = require('mongodb');
//var host = 'localhost';
//var port = 27017;
//
//var server = new mongo.Server(host,port,{auto_reconnect:true});
//var db = new mongo.Db('ten',server,{safe:true});
//module.exports = db;

var MongoClient = require('mongodb').MongoClient;
var DB_CONN_STR = 'mongodb://localhost:27017/ten'; //# 数据库为 ten
exports.mongo = MongoClient;
exports.ten = DB_CONN_STR;

node与mongodb连接

let Db=require('.././database/db.js');
let express = require('express');
let router = express.Router();

router.get('/', function(req, res) {
  let response;
  Db.mongo.connect(Db.ten, function(err,db){
    console.log('链接成功');
    let Users=db.collection('person');
    Users.find({name:'jack'}).toArray(function(err,doc){
      if(doc.length){
        response={'suc':true,'res':doc[0],msg:'成功'};
      }else{
        response={'suc':false,'msg':'账号或密码有误'};
      }
      db.close();
      res.json(response);
    });
    //res.json(response); //此处不行
  });
});

上为返回的内容

5、自己查看数据库

mongo

use ten

show collections 查看表

show dbs 查看数据库

db.user.remove({}) 删除集合user

db.user.count() 集合user内有多少个数据