express+mongoose实现对mongodb增删改查操作详解

"scripts": {
 "start": "supervisor ./bin/www"
 },

'use strict'
const routes = (app) => {
 app.get('/', (req, res, next) => {
  res.render('index', { title: 'Jrain真的很帅'})
 })
}

var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');

var routes = require('./routes/index');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');

// uncomment after placing your favicon in /public
app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

routes(app)

// catch 404 and forward to error handler
app.use(function(req, res, next) {
 var err = new Error('Not Found');
 err.status = 404;
 next(err);
});

// error handlers

// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
 app.use(function(err, req, res, next) {
 res.status(err.status || 500);
 res.render('error', {
  message: err.message,
  error: err
 });
 });
}

// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
 res.status(err.status || 500);
 res.render('error', {
 message: err.message,
 error: {}
 });
});

module.exports = app;

'use strict'
const mongoose = require('mongoose')
// 连接mongodb
mongoose.connect('mongodb://localhost/test')
// 实例化连接对象
const db = mongoose.connection
db.on('error', console.error.bind(console, '连接错误：'))
db.once('open', (callback) => {
 console.log('MongoDB连接成功！！')
})
// 创建schema
const classSchema = new mongoose.Schema({
 name: String,
 studentId: Number
})
// 创建model
const classModel = mongoose.model('newClass', classSchema) // newClass为创建或选中的集合

module.exports = classModel

'use strict'
const classModel = require('../modules/my_class')
const routes = (app) => {
 // 首页
 app.get('/', (req, res, next) => {
  let response = res
  classModel.find({}, (err, result, res) => {
   if(err) return console.log(err)
   response.render('index', { result })
  })
 })
 // 增加学生信息
 app.get('/create', (req, res, next) => {
  res.render('create', {})
 })
 app.post('/create', (req, res, next) => {
  let newStudent = [{
   name: req.body.name,
   studentId: req.body.student_id
  }]
  classModel.create(newStudent, (err) => {
   if(err) return console.log(err)
   res.send("<a href='/'>添加成功，点击返回首页</a>")
  })
 })
 // 删除学生信息
 app.get('/del', (req, res, next) => {
  let response = res
  classModel.find({}, (err, result, res) => {
   if(err) return console.log(err)
   response.render('del', { result })
  })
 })
 app.post('/del', (req, res, next) => {
  classModel.remove({_id: req.body.student}, (err, result) => {
   if(err) return console.log(err)
   console.log(result.result)
   res.send("<a href='/'>删除成功，点击返回首页</a>")
  })
 })
 // 修改学生信息
 app.get('/update', (req, res, next) => {
  let response = res
  classModel.find({}, (err, result, res) => {
   if(err) return console.log(err)
   response.render('update', { result })
  })
 })
 app.post('/update', (req, res, next) => {
  console.log(req.body)
  let num = req.body.num,
   condiction = {_id: req.body._id[num]},
   query = {$set: {name: req.body.name[num], studentId: req.body.student_id[num]}}
  classModel.update(condiction, query, (err, result) => {
   if(err) {
    console.log(err)
    res.send('<script>alert("请勾选待修改的学生")</script>')
   }
   res.send("<a href='/'>修改成功，点击返回首页</a>")
  })
 })
 // 查找学生
 app.get('/reach', (req, res, next) => {
  let result = null
  res.render('reach', { result })
 })
 app.post('/reach', (req, res, next) => {
  console.log(req.body)
  let response = res
  let reachType = req.body.reach_type,
   keyWord = req.body.keyword
  if (reachType == 0) {
   classModel.find({name: keyWord}, (err, result) => {
    if(err) return console.log(err)
    response.render('reach', { result })
   })
  } else {
   classModel.find({studentId: keyWord}, (err, result) => {
    if(err) return console.log(err)
    response.render('reach', { result })
   })
  }
 })
}
module.exports = routes