3-4 mongoose默认参数,模块化

1.mongoose默认参数

var UserSchema = new mongoose.Schema({
    name:String,
    age:Number,
    status:{
        type: Number,
        default:1
    }
})

2.模块化

//model/db.js
const mongoose = require('mongoose');
mongoose.connect( 'mongodb://127.0.0.1:27017/eggcms', {useNewUrlParser: true},(err)=>{
    if(err) throw err;
    console.log("database连接成功")
});
module.exports = mongoose;

//model/user.js
var mongoose = require('./db');
var UserSchema = new mongoose.Schema({
    name:String,
    age:Number
})
var User =  mongoose.model('User',UserSchema,'user');
module.exports = User;

//app.js引入
const UserModel = require('./model/user');
UserModel.find({},(err,doc)=>{
    console.log(doc)
})

3.console.time测试mongoose的性能

console.time('user')
const UserModel = require('./model/user');
console.timeEnd('user')
console.time('news')
const NewsModel = require('./model/news');
console.timeEnd('news')