node.js下mongoose简单操作实例

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

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

1 // 链接错误
2 db.on('error', function(error) {
3     console.log(error);
4 });

1 // Schema 结构
2 var mongooseSchema = new mongoose.Schema({
3     username : {type : String, default : '匿名用户'},
4     title    : {type : String},
5     content  : {type : String},
6     time     : {type : Date, default: Date.now},
7     age      : {type : Number}
8 });

1 // 添加 mongoose 实例方法
2 mongooseSchema.methods.findbyusername = function(username, callback) {
3     return this.model('mongoose').find({username: username}, callback);
4 }

1 // 添加 mongoose 静态方法，静态方法在Model层就能使用
2 mongooseSchema.statics.findbytitle = function(title, callback) {
3     return this.model('mongoose').find({title: title}, callback);
4 }

1 // model
2 var mongooseModel = db.model('mongoose', mongooseSchema);

01 // 增加记录 基于 entity 操作
02 vardoc = {username : 'emtity_demo_username', title : 'emtity_demo_title', content : 'emtity_demo_content'};
03 var mongooseEntity = new mongooseModel(doc);
04 mongooseEntity.save(function(error) {
05     if(error) {
06         console.log(error);
07     } else {
08         console.log('saved OK!');
09     }
10     // 关闭数据库链接
11     db.close();
12 });

01 // 增加记录 基于model操作
02 vardoc = {username : 'model_demo_username', title : 'model_demo_title', content : 'model_demo_content'};
03 mongooseModel.create(doc, function(error){
04     if(error) {
05         console.log(error);
06     } else {
07         console.log('save ok');
08     }
09     // 关闭数据库链接
10     db.close();
11 });

01 // 修改记录
02 mongooseModel.update(conditions, update, options, callback);
03 var conditions = {username : 'model_demo_username'};
04 var update     = {$set : {age : 27, title : 'model_demo_title_update'}};
05 var options    = {upsert : true};
06 mongooseModel.update(conditions, update, options, function(error){
07     if(error) {
08         console.log(error);
09     } else {
10         console.log('update ok!');
11     }
12     //关闭数据库链接
13     db.close();
14 });

01 // 查询
02 // 基于实例方法的查询
03 var mongooseEntity = new mongooseModel({});
04 mongooseEntity.findbyusername('model_demo_username', function(error, result){
05     if(error) {
06         console.log(error);
07     } else {
08         console.log(result);
09     }
10     //关闭数据库链接
11     db.close();
12 });

01 // 基于静态方法的查询
02 mongooseModel.findbytitle('emtity_demo_title', function(error, result){
03     if(error) {
04         console.log(error);
05     } else {
06         console.log(result);
07     }
08     //关闭数据库链接
09     db.close();
10 });

01 // mongoose find
02 var criteria = {title : 'emtity_demo_title'}; // 查询条件
03 var fields   = {title : 1, content : 1, time : 1}; // 待返回的字段
04 var options  = {};
05 mongooseModel.find(criteria, fields, options, function(error, result){
06     if(error) {
07         console.log(error);
08     } else {
09         console.log(result);
10     }
11     //关闭数据库链接
12     db.close();
13 });

01 // 删除记录
02 var conditions = {username: 'emtity_demo_username'};
03 mongooseModel.remove(conditions, function(error){
04     if(error) {
05         console.log(error);
06     } else {
07         console.log('delete ok!');
08     }
09
10
11     //关闭数据库链接
12     db.close();