Express connection to MongoDB practice

Good nonsense to say, look directly at the code:

2. First Download MongoDB

    npm i mognodb --save  或者 cnpm i mongodb

4. Create a new folder in the current Express project DB, and then create a new test.js database connection file

   // 链接 firstblood 集合var mongoose = require('mongoose');var db = mongoose.createConnection('mongodb://localhost:27017/firstblood');// 链接错误db.on('error', function(error) {    console.log(error);});// Schema 结构var Schema = mongoose.Schema;//表一var userlistScheMa = new Schema({    user     : String,    password : String,    //content  : {type : String},    //time     : {type : Date, default: Date.now},    age      : Number,    name     : String,    phone    : String,    address  : String,    numbers  : String,});// 关联 userlist -> admins 表   表数据有问题，一切都白搭!//表一exports.userlist = db.model('admins', userlistScheMa,'admins');exports.db = db;console.log('数据库启动成功！！！！');

6. Find App.js in the current Express project to introduce the database connection file inside

   require('./db/test');var userlist = require("./db/test").userlist

8. Use the current table to do additions and deletions and change the operation

   // 查找userlist.find({查找值名: 传入当前搜索值},fucntion(err, docs){    console.log(docs)})// 修改userlist.update({    修改值名 : 传入当前修改值}, {    user:req.query.user,    password: req.query.password,    age: req.query.age,    numbers: req.query.numbers,    name: req.query.name,    phone: req.query.phone,    address: req.query.address // 更新操作}, function(error) {});// 删除userlist.remove({    删除值名: 传入需要删除的值}, function(err,docs) {    if (err) return handleError(err);    // removed!});// 增加var userlist2 = new userlist({    增加值名： 增加值,    增加值名： 增加值})userlist2.save(function(err,docs){    /**设置响应头允许ajax跨域访问**/    res.setHeader("Access-Control-Allow-Origin","*");    /*星号表示所有的异域请求都可以接受，*/    res.setHeader("Access-Control-Allow-Methods","GET,POST");    if(err){        res.send('1')    }else{        res.send('保存成功！')    }})

Express connection to MongoDB practice