Javascript 如何在express中路由CRUD操作？_Javascript_Node.js_Express

Javascript 如何在express中路由CRUD操作？

javascript node.js express

Javascript 如何在express中路由CRUD操作？,javascript,node.js,express,Javascript,Node.js,Express,我为node.js、express和使用mongoose的MongoDB连接编写了以下代码首先，我尝试了一个名为server.js的文件，它在没有express的情况下工作。但现在我想在express中执行，但它不起作用它只是一个简单的程序，可以读取和创建mongo数据库中的sampleBear对象这是我的app.js var express = require('express'); var path = require('path'); var favicon = require('s

我为node.js、express和使用mongoose的MongoDB连接编写了以下代码

首先，我尝试了一个名为server.js的文件，它在没有express的情况下工作。但现在我想在express中执行，但它不起作用

它只是一个简单的程序，可以读取和创建mongo数据库中的sample

Bear

对象

这是我的app.js

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 users = require('./routes/users');
var mongoose = require('mongoose');
var db = mongoose.connect('localhost:27017/nodetest1');

//var Bear = require('./routes/users');


var app = express();

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

// 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: true }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

var port = process.env.PORT || 8080;

// Make our db accessible to our router
app.use(function(req,res,next){
    req.db = db;
    next();
});

// ROUTES FOR OUR API
// =============================================================================
var router = express.Router();              // get an instance of the express Router

router.use(function(req,res,next){
  console.log('something is happening');
  next();
});

// test route to make sure everything is working (accessed at GET http://localhost:8080/api)
router.get('/', function(req, res) {
    res.json({ message: 'hooray! welcome to our api!' });   
});

// more routes for our API will happen here




// REGISTER OUR ROUTES -------------------------------
// all of our routes will be prefixed with /api

app.use('/', router);
app.use('/bears', users);

// START THE SERVER
// =============================================================================
app.listen(port);
console.log('Magic happens on port ' + port);


// 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;

var express = require('express');
var router = express.Router();

var Schema = mongoose.Schema;

var BearSchema = new Schema({
  name: String
});

module.exports = mongoose.model('Bear',BearSchema);


router.route('/bears')

    // create a bear (accessed at POST http://localhost:8080/api/bears)
    .post(function(req, res) {

        var bear = new Bear();      // create a new instance of the Bear model
        bear.name = req.body.name;  // set the bears name (comes from the request)

        // save the bear and check for errors
        bear.save(function(err) {
            if (err)
                res.send(err);

            res.json({ message: 'Bear created!' });
        });

    });
module.exports = router;

这里是我的users.js

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 users = require('./routes/users');
var mongoose = require('mongoose');
var db = mongoose.connect('localhost:27017/nodetest1');

//var Bear = require('./routes/users');


var app = express();

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

// 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: true }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

var port = process.env.PORT || 8080;

// Make our db accessible to our router
app.use(function(req,res,next){
    req.db = db;
    next();
});

// ROUTES FOR OUR API
// =============================================================================
var router = express.Router();              // get an instance of the express Router

router.use(function(req,res,next){
  console.log('something is happening');
  next();
});

// test route to make sure everything is working (accessed at GET http://localhost:8080/api)
router.get('/', function(req, res) {
    res.json({ message: 'hooray! welcome to our api!' });   
});

// more routes for our API will happen here




// REGISTER OUR ROUTES -------------------------------
// all of our routes will be prefixed with /api

app.use('/', router);
app.use('/bears', users);

// START THE SERVER
// =============================================================================
app.listen(port);
console.log('Magic happens on port ' + port);


// 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;

var express = require('express');
var router = express.Router();

var Schema = mongoose.Schema;

var BearSchema = new Schema({
  name: String
});

module.exports = mongoose.model('Bear',BearSchema);


router.route('/bears')

    // create a bear (accessed at POST http://localhost:8080/api/bears)
    .post(function(req, res) {

        var bear = new Bear();      // create a new instance of the Bear model
        bear.name = req.body.name;  // set the bears name (comes from the request)

        // save the bear and check for errors
        bear.save(function(err) {
            if (err)
                res.send(err);

            res.json({ message: 'Bear created!' });
        });

    });
module.exports = router;

请告诉我如何路由CRUD操作。

一个文件中不能有两个module.exports。位于文件底部的那个重写了所有其他文件

你需要两个文件，比如

controllers/users.js

var express = require('express');
var router = express.Router();

router.route('/bears')

    // create a bear (accessed at POST http://localhost:8080/api/bears)
    .post(function(req, res) {

        var bear = new Bear();      // create a new instance of the Bear model
        bear.name = req.body.name;  // set the bears name (comes from the request)

        // save the bear and check for errors
        bear.save(function(err) {
            if (err)
                res.send(err);

            res.json({ message: 'Bear created!' });
        });

    });
module.exports = router;

models/user.js

var mongoose = require('mongoose');
var Schema = mongoose.Schema;

var BearSchema = new Schema({
  name: String
});

module.exports = mongoose.model('Bear',BearSchema);

在app.js中，您可以执行以下操作：

var user = require('controllers/user');
app.use('/users', user);

It端点现在收听

/users/bears

如果你在某处需要你的模型，只需加载

var userModel = mongoose.model('User');

我建议您下载并运行它，当您看到新功能的实现方式时，添加新功能会更容易

型号/emp.js

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 users = require('./routes/users');
var mongoose = require('mongoose');
var db = mongoose.connect('localhost:27017/nodetest1');

//var Bear = require('./routes/users');


var app = express();

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

// 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: true }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

var port = process.env.PORT || 8080;

// Make our db accessible to our router
app.use(function(req,res,next){
    req.db = db;
    next();
});

// ROUTES FOR OUR API
// =============================================================================
var router = express.Router();              // get an instance of the express Router

router.use(function(req,res,next){
  console.log('something is happening');
  next();
});

// test route to make sure everything is working (accessed at GET http://localhost:8080/api)
router.get('/', function(req, res) {
    res.json({ message: 'hooray! welcome to our api!' });   
});

// more routes for our API will happen here




// REGISTER OUR ROUTES -------------------------------
// all of our routes will be prefixed with /api

app.use('/', router);
app.use('/bears', users);

// START THE SERVER
// =============================================================================
app.listen(port);
console.log('Magic happens on port ' + port);


// 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;

var express = require('express');
var router = express.Router();

var Schema = mongoose.Schema;

var BearSchema = new Schema({
  name: String
});

module.exports = mongoose.model('Bear',BearSchema);


router.route('/bears')

    // create a bear (accessed at POST http://localhost:8080/api/bears)
    .post(function(req, res) {

        var bear = new Bear();      // create a new instance of the Bear model
        bear.name = req.body.name;  // set the bears name (comes from the request)

        // save the bear and check for errors
        bear.save(function(err) {
            if (err)
                res.send(err);

            res.json({ message: 'Bear created!' });
        });

    });
module.exports = router;

const mongoose=require（'mongoose'）；
var Schema=mongoose.Schema；
var conn=猫鼬收集；
var empSchema=newmongoose.Schema({
名称：String，
电子邮件：String，
年龄：字符串，
性别：字符串
});
var empModel=mongoose.model（'Emp'，empSchema）；
module.exports=empModel；

routes/index.js

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 users = require('./routes/users');
var mongoose = require('mongoose');
var db = mongoose.connect('localhost:27017/nodetest1');

//var Bear = require('./routes/users');


var app = express();

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

// 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: true }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

var port = process.env.PORT || 8080;

// Make our db accessible to our router
app.use(function(req,res,next){
    req.db = db;
    next();
});

// ROUTES FOR OUR API
// =============================================================================
var router = express.Router();              // get an instance of the express Router

router.use(function(req,res,next){
  console.log('something is happening');
  next();
});

// test route to make sure everything is working (accessed at GET http://localhost:8080/api)
router.get('/', function(req, res) {
    res.json({ message: 'hooray! welcome to our api!' });   
});

// more routes for our API will happen here




// REGISTER OUR ROUTES -------------------------------
// all of our routes will be prefixed with /api

app.use('/', router);
app.use('/bears', users);

// START THE SERVER
// =============================================================================
app.listen(port);
console.log('Magic happens on port ' + port);


// 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;

var express = require('express');
var router = express.Router();

var Schema = mongoose.Schema;

var BearSchema = new Schema({
  name: String
});

module.exports = mongoose.model('Bear',BearSchema);


router.route('/bears')

    // create a bear (accessed at POST http://localhost:8080/api/bears)
    .post(function(req, res) {

        var bear = new Bear();      // create a new instance of the Bear model
        bear.name = req.body.name;  // set the bears name (comes from the request)

        // save the bear and check for errors
        bear.save(function(err) {
            if (err)
                res.send(err);

            res.json({ message: 'Bear created!' });
        });

    });
module.exports = router;

var express=require（'express'）；
var router=express.router（）；
const mongoose=require（'mongoose'）；
var empModel=require（'../models/emp'）；
猫鼬。连接（“mongodb://localhost:27017/employee“，{useNewUrlParser:true，useUnifiedTopology:true}）；
router.get（'/'，函数（req，res，next）{
empModel.find（{}，函数（err，docs）{
res.render（'index'，{title:'Express'，result:docs}）；
})
});
router.post（'/'，函数（req，res，next）{
const emp=新的emp模型({
名称：req.body.name，
电子邮件：req.body.email，
年龄：要求的身体年龄，
性别：req.body.gender
});
电磁脉冲
.save（）
。然后（结果=>{
res.redirect（“/”）；
})
.catch（错误=>{
res.status（500）.json（{error:err}）；
});
});
router.get（'/update'，函数（req、res、next）{
empModel.find（{}，函数（err，docs）{
res.render（'update'，{title:'Express'，result:docs}）；
})
});
router.post（'/update'，函数（req，res，next）{
empModel.findOneAndUpdate（{email:req.body.email}，{$set:{name:req.body.name，age:req.body.age，gender:req.body.gender}}，{returnOriginal:false}）.exec（）。然后（结果=>{
res.redirect（“/”）；
}).catch（错误=>{
res.status（500）.json（{error:err}）；
});
});
router.get（'/delete'，函数（req、res、next）{
empModel.find（{}，函数（err，docs）{
res.render（'delete'，{title:'Express'，result:docs}）；
})
});
router.post（'/delete'，函数（req，res，next）{
empModel.remove（{email:req.body.email}）.exec（）。然后（结果=>{
res.redirect（“/”）；
}).catch（错误=>{
res.status（500）.json（{error:err}）；
});
});
module.exports=路由器；

视图/index.js

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 users = require('./routes/users');
var mongoose = require('mongoose');
var db = mongoose.connect('localhost:27017/nodetest1');

//var Bear = require('./routes/users');


var app = express();

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

// 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: true }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

var port = process.env.PORT || 8080;

// Make our db accessible to our router
app.use(function(req,res,next){
    req.db = db;
    next();
});

// ROUTES FOR OUR API
// =============================================================================
var router = express.Router();              // get an instance of the express Router

router.use(function(req,res,next){
  console.log('something is happening');
  next();
});

// test route to make sure everything is working (accessed at GET http://localhost:8080/api)
router.get('/', function(req, res) {
    res.json({ message: 'hooray! welcome to our api!' });   
});

// more routes for our API will happen here




// REGISTER OUR ROUTES -------------------------------
// all of our routes will be prefixed with /api

app.use('/', router);
app.use('/bears', users);

// START THE SERVER
// =============================================================================
app.listen(port);
console.log('Magic happens on port ' + port);


// 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;

var express = require('express');
var router = express.Router();

var Schema = mongoose.Schema;

var BearSchema = new Schema({
  name: String
});

module.exports = mongoose.model('Bear',BearSchema);


router.route('/bears')

    // create a bear (accessed at POST http://localhost:8080/api/bears)
    .post(function(req, res) {

        var bear = new Bear();      // create a new instance of the Bear model
        bear.name = req.body.name;  // set the bears name (comes from the request)

        // save the bear and check for errors
        bear.save(function(err) {
            if (err)
                res.send(err);

            res.json({ message: 'Bear created!' });
        });

    });
module.exports = router;


.登入表格{
宽度：300px；
保证金：0自动；
字体系列：塔荷马，日内瓦，无衬线；
}
.登入表格h1{
文本对齐：居中；
颜色：#4d；
字体大小：24px；
填充：20px 0 20px 0；
}
.登录表单输入[type=“password”]，
.登录表单输入[type=“text”]{
宽度：100%；
填充：15px；
边框：1px实心#dddddd；
边缘底部：15px；
框大小：边框框；
}
.登录表单输入[type=“submit”]{
宽度：100%；
填充：15px；
背景色：红色；
边界：0；
框大小：边框框；
光标：指针；
字体大小：粗体；
颜色：#ffffff；
}

Sr
名称
电子邮件
年龄
性别
积垢手术

请指定您面临的错误。请在这里评论错误？所以我可以调试它。使用GET请求来更改状态是一种不好的做法。