mongoose数据库连接和操作

! mongodb注意点：数据表名称一定要用复数,比如users,在使用model引用时也必须复数

var mongoose = require('mongoose')

mongoose.connect('mongodb://localhost:27017/hometown',{useMongoClient: true});
var db = mongoose.connection;

db.on('error', console.error.bind(console, 'connection error:'));
db.once('open', function (callback) {
  console.log('db service connected.')
});

//set schema
var blogSchema = new mongoose.Schema({
    article_id: {type:Number,default:0},
      title: String,
      detail: String,
      img: String,
      view: {type:Number,default:0}
});
//pub model
var blogModel = db.model('towntrip',blogSchema);

blogModel.find(function(err,articles){ //find({},fn)
    res.render('index', {title:'Home Town',articles:articles})
})

//add data
//var data = new blogModel({title:'Guanyin Mountain',detail:'With history culture,Guanyin Mountain is known for so many years.',img:'upload/img/a2.jpg',view:0})
//data.save()

//update data
//blogModel.update({_id:'5850c66834d5c51918f04d4c'},{$set:{view:1}},function(err){});