mongodb

非关系型数据库nosql. 没有行列的说法，只有collection 文档 相对老的数据的说法就是表和记录。

安装：

brew update
brew install mongodb复制代码

安装的路径：

cd /usr/local/Cellar/mongodb/3.4.3/bin
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启动：brew services start mongodb 关闭：brew services stop mongodb 浏览器打开网址：localhost:27017 并在bin的文件目录下运行命令./mongo 命令show dbs可以查看已经创建的数据库

test 是我建的一个数据库show dbs //显示数据库
db // 查看已选定的数据库
use test //使用某个数据库 没有则新建
db.createColletion(‘user’) //创建集合user 是我创建的一个集合db. user.insert({‘name’:’byc’}) //插入一条记录
db. user.find() //查找所有记录
db.user.findOne();
db.dropDatabase() //删除数据库
db. user.drop //删除指定集合
show collections //显示所有集合
db. user.save({}) //插入记录db.test.update({‘_id’,1},{$set:{name:’test’,age:20}})
db. user.remove({}) //删除所有集合
for(var i=1;i<=10;i++){db.test.insert({"name":"king"+i,"age":i})} //循环插入10条记录
db.user.find().pretty() //格式化显示查询结果
db.user.find().count() //查询数据条数
db.user.find({"age":5}) /查找age是5的条目
db.user.find({"age":{$gt:5}}) //查找age大于5的条目
db.user.find({"age":{$gt:5}}).sort({"age":1}) //查找age大于5的条目且升序排列
db.user.find({"age":{$gt:5}}).sort({"age":1}) //查找age大于5的条目且升序排列
db.user.find({"age":{$gt:5}}).sort({"age”:-1}) //查找age大于5的条目且降序排列
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图形化管理工具： Robomongo

nodejs连接数据库： 安装依赖pack: npm install mongoose 如果不安装则报错找不到mongodb e.g：

var  mongodb = require('mongodb');
var  server  = new mongodb.Server('localhost', 27017, {auto_reconnect:true});
var  db = new mongodb.Db('test', server, {safe:true});//连接db
db.open(function(err, db){if(!err){console.log('connect db');// 连接Collection（可以认为是mysql的table）// 第1种连接方式// db.collection('mycoll',{safe:true}, function(err, collection){//     if(err){//         console.log(err);//     }// });// 第2种连接方式db.createCollection('user', {safe:true}, function(err, collection){if(err){console.log(err);}else{//新增数据// var tmp1 = {id:'1',title:'hello',number:1};//          collection.insert(tmp1,{safe:true},function(err, result){//              console.log(result);//          });//更新数据// collection.update({title:'hello'}, {$set:{number:3}}, {safe:true}, function(err, result){//     console.log(result);// });// 删除数据// collection.remove({title:'hello'},{safe:true},function(err,result){//                   console.log(result);//               });// console.log(collection);// 查询数据var tmp1 = {title:'hello'};var tmp2 = {title:'world'};collection.insert([tmp1,tmp2],{safe:true},function(err,result){console.log(result);});collection.find().toArray(function(err,docs){console.log('find');console.log(docs);});collection.findOne(function(err,doc){console.log('findOne');console.log(doc);});}});// console.log('delete ...');// //删除Collection// db.dropCollection('mycoll',{safe:true},function(err,result){//           if(err){//         console.log('err:');//         console.log(err);//     }else{//         console.log('ok:');//         console.log(result);//     }//       });}else{console.log(err);}
});
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mongodb 通过 mongoose来建模

1.Schema（模式定义） e.g.:

var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var MovieSchema = new Schema({director: String,title: String,language: String,country: String,summary: String,flash: String,poster: String,year: Number,meta: {createAt: {type: Date,default: Date.now()},updateAt: {type: Date,default: Date.now()}}
});MovieSchema.pre('save', function(next) {if (this.isNew) {this.meta.createAt = this.meta.updateAt = Date.now();}else {this.meta.updateAt = Date.now();}next();
});MovieSchema.statics = {fetch: function(cb) {return this.find({}).sort('meta.updateAt').exec(cb);},findById: function(id, cb) {return this.findOne({_id: id}).exec(cb);}
};module.exports = MovieSchema;
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2.Model（编译模型） e.g.:

var mongoose = require('mongoose');
var MovieSchema = require('../schemas/movie');
var Movie = mongoose.model('Movie', MovieSchema);module.exports = Movie;
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3.Documents (文档实例化)

var mongoose = require('mongoose');
var dbUrl = 'mongodb://localhost/imooc';
mongoose.connect(dbUrl);
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路由index.js：

var express = require('express');
var router = express.Router();
var Movie = require('../models/movie');/* GET home page. */
router.get('/', function (req, res, next) {Movie.fetch(function (err, movies) {if (err) {console.log(err);}res.render('index', {title: 'imooc首页',movies: movies});});});router.get('/movie/:id', function (req, res, next) {var id = req.params.id;Movie.findById(id, function (err, movie) {if (err) {console.log(err);}res.render('detail', {title: "imooc 详情页",movie: movie});});
});
module.exports = router;复制代码

路由users.js:

var express = require('express');
var router = express.Router();
var Movie = require('../models/movie');
var _ = require('underscore');/* POST new movie. */
router.post('/movie/new', function (req, res, next) {var id = req.body.movie._id;var movieObj = req.body.movie;var _movie;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({director: movieObj.director,title: movieObj.title,country: movieObj.country,language: movieObj.language,year: movieObj.year,poster: movieObj.poster,flash: movieObj.flash,summary: movieObj.summary,});_movie.save(function (err, movie) {if (err) {console.log(err);}res.redirect('/movie/' + movie._id);});}
});router.get('/movie', function (req, res, next) {res.render('admin', {title: "imooc 后台录入页",movie: {title: '',country: '',year: '',poster: '',flash: '',director: '',summary: '',language: ''}});
});router.get('/list', function (req, res, next) {Movie.fetch(function (err, movies) {if (err) {console.log(err);}res.render('list', {title: 'imooc管理员列表',movies: movies});});
});router.get('/movie/update/:id', function (req, res, next) {var id = req.params.id;Movie.findById(id, function (err, movie) {if (err) {console.log(err);}res.render('admin', {title: "imooc 后台更新页",movie: movie});});
});
module.exports = router;复制代码