Simple operation example of mongoose under node.js

Mongoose API : http://mongoosejs.com/docs/api.html

// mongoose 链接var mongoose = require('mongoose');var db       = mongoose.createConnection('mongodb://127.0.0.1:27017/NodeJS');

// 链接错误
db.on('error',function(error){
    console.log(error);});

// Schema 结构var mongooseSchema =new mongoose.Schema({
    username :{type :String,default:'匿名用户'},
    title    :{type :String},
    content  :{type :String},
    time     :{type :Date,default:Date.now},
    age      :{type :Number}});

// 添加 mongoose 实例方法
mongooseSchema.methods.findbyusername =function(username, callback){returnthis.model('mongoose').find({username: username}, callback);}

// 添加 mongoose 静态方法，静态方法在Model层就能使用
mongooseSchema.statics.findbytitle =function(title, callback){returnthis.model('mongoose').find({title: title}, callback);}

// modelvar mongooseModel = db.model('mongoose', mongooseSchema);

// 增加记录 基于 entity 操作var doc ={username :'emtity_demo_username', title :'emtity_demo_title', content :'emtity_demo_content'};var mongooseEntity =new mongooseModel(doc);
mongooseEntity.save(function(error){if(error){
        console.log(error);}else{
        console.log('saved OK!');}// 关闭数据库链接
    db.close();});

// 增加记录 基于model操作var doc ={username :'model_demo_username', title :'model_demo_title', content :'model_demo_content'};
mongooseModel.create(doc,function(error){if(error){
        console.log(error);}else{
        console.log('save ok');}// 关闭数据库链接
    db.close();});

// 修改记录
mongooseModel.update(conditions, update, options, callback);
var conditions ={username :'model_demo_username'};
var update     ={$set :{age :27, title :'model_demo_title_update'}};
var options    ={upsert :true};
mongooseModel.update(conditions, update, options,function(error){if(error){
        console.log(error);}else{
        console.log('update ok!');}//关闭数据库链接
    db.close();});

// 查询// 基于实例方法的查询
var mongooseEntity =new mongooseModel({});
mongooseEntity.findbyusername('model_demo_username',function(error, result){if(error){
        console.log(error);}else{
        console.log(result);}//关闭数据库链接
    db.close();});

// 基于静态方法的查询
mongooseModel.findbytitle('emtity_demo_title',function(error, result){if(error){
        console.log(error);}else{
        console.log(result);}//关闭数据库链接
    db.close();});

// mongoose findvar criteria ={title :'emtity_demo_title'};// 查询条件var fields   ={title :1, content :1, time :1};// 待返回的字段var options  ={};
mongooseModel.find(criteria, fields, options,function(error, result){if(error){
        console.log(error);}else{
        console.log(result);}//关闭数据库链接
    db.close();});

// 删除记录var conditions ={username:'emtity_demo_username'};
mongooseModel.remove(conditions,function(error){if(error){
        console.log(error);}else{
        console.log('delete ok!');}//关闭数据库链接
    db.close();});