3-2编写数据库交互代码

ch3-项目数据库实现

编写数据库交互（增改查）代码

（定义好）模式schema，并（编译好）模型model之后，再利用mongoose模块连接本地数据库

需要在本地预先安装MongoDB

app.js

var express = require('express');
// var path = require('path');  //静态资源目录，新版express要独立安装static
var serveStatic = require('serve-static');
var bodyParser = require('body-parser');
var mongoose = require('mongoose');
var _ = require('underscore');  //根据新对象覆盖老对象的值
var Movie = require('./models/movie');  //取得模型
var port = process.env.PORT || 3000;
var app = express();

mongoose.connect('mongodb://localhost/imooc');  //连接数据库

app.set('views', './views/pages/'); //修改视图模板目录
app.set('view engine', 'jade');
// app.use(express.bodyParser());   //表单数据格式化，新版express不捆绑bodyParser
// app.use(express.static(path.join(__dirnamr, 'bower_components')));   //告诉express页面请求中样式和脚本的请求去path中查找
app.use(bodyParser.urlencoded());
// app.use(bodyParser.json({limit: '1mb'}));  //body-parser 解析json格式数据
// app.use(bodyParser.urlencoded({            //此项必须在 bodyParser.json 下面,为参数编码
  // extended: true
// }));
app.use(serveStatic('bower_components'));
app.listen(port);

console.log('imooc started on port ' + port);

//路由
//index page
app.get('/', function(req, res){    //路由规则和URL地址相匹配
    Movie.fetch(function(err, movies){  //获取所有数据
        if(err){
            console.log(err);
        }
        res.render('index', {   //渲染模板
            title: 'imooc 首页',
            movies: movies
        });
    });
    
});

//detail page
app.get('/movie/:id', function(req, res){
    var id = req.params.id;
    Movie.findById(id, function(err, movie){    //获取指定id电影数据
        res.render('detail', {
            title: 'imooc ' + movie.title,
            movie: movie
        });
    });

});

//admin page
app.get('/admin/movie', function(req, res){
    res.render('admin', {
        title: 'imooc 录入页',
        movie: {
            doctor: '',
            country: '',
            title: '',
            year: '',
            poster: '',
            language: '',
            flash: '',
            summary: ''
        }
    });
});

//admin update movie
app.get('/movie/update/:id', function(req, res){
    var id = req.params.id;
    if(id){
        Movie.findById(id, function(err, movie){
            res.render('admin', {
                title: 'imooc 后台更新页',
                movie: movie
            });
        });
    }
});

//admin post movie
app.post('/admin/movie/new', function(req, res){
    var movieObj = req.body.movie;
    var id = movieObj._id;
    if(id !== 'undefined'){
        Movie.findById(id, function(err, movie){
            if(err){
                console.log(err);
            }

            _movie = _.extend(movie, movieObj);
            _movie.save(function(err, movie){
                if(err){
                    console.log(err);
                }

                res.redirect('/movie/' + movie._id);
            });

        });
    }else{
        _movie = new Movie({
            doctor: movieObj.doctor,
            title: movieObj.title,
            country: movieObj.country,
            language: movieObj.language,
            year: movieObj.year,
            poster: movieObj.poster,
            summary: movieObj.summary,
            flash: movieObj.flash,
        });
        _movie.save(function(err, movie){   //存储数据
            if(err){
                console.log(err);
            }

            res.redirect('/movie/' + movie._id);
        });
    }
});

//list page
app.get('/admin/list/', function(req, res){
    Movie.fetch(function(err, movies){
        if(err){
            console.log(err);
        }
        res.render('list', {
            title: 'imooc 列表页',
            movies: movies
        });
    });
});