mongooseでMongoDBに接続してみる

前回と前々回はmongodbとmongoskinを使ってMongoDBに接続処理を紹介しました、今回はmongooseの使い方を紹介します。

Mongoose
http://mongoosejs.com/

まず、インストールします

npm install mongoose

MongoDBは何もせずに、直接にアクセスコードを書きます

nano mongoose.js
...
var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/test01');

var kittySchema = mongoose.Schema({
    name: String,
    age: Number
    });
kittySchema.methods.speak = function () {
  var greeting = this.name
      ? "Meow name is " + this.name : "I don't have a name"
  console.log(greeting);
}
kittySchema.statics.findAge10 = function(cb) {
  this.find({age:10}, cb);
}

var db = mongoose.connection;
db.on('error', console.error.bind(console, 'connection error:'));
db.once('open', function callback () {
    var Kitten = mongoose.model('Kitten', kittySchema);
    var silence = new Kitten({ name: 'Silence', age: 10 });
    console.log(silence.name);
    silence.speak();

    silence.save(function(error, doc){
        if (error) throw error;

        doc.speak();
    });

    Kitten.find({age:10}, function(error, kittens){
        if (error) throw error;
        //console.log(kittens.length);
        for(var i = 0; i < kittens.length; i++) {
            console.log("name=" + kittens[i].name + ", age=" + kittens[i].age);
        }
    });
    Kitten.findAge10(function(error, kittens){
        if (error) throw error;
        for(var i = 0; i < kittens.length; i++) {
            console.log("[findAge10]" + "_id=" + kittens[i]._id + ", name=" + kittens[i].name + ", age=" + kittens[i].age);
        }
    });
});
...

MongoDBにコマンドラインで確認

mongo test01
MongoDB shell version: 2.4.6
connecting to: test01
> db.kittens.find();
{ "name" : "Silence", "_id" : ObjectId("526363e14c9737ad7d000001"), "__v" : 0 }
{ "name" : "Silence", "_id" : ObjectId("526364602b72debd7d000001"), "__v" : 0 }
{ "name" : "Silence", "_id" : ObjectId("526366ac44f9bbdc7d000001"), "__v" : 0 }
{ "name" : "Silence", "_id" : ObjectId("526366af45401de77d000001"), "__v" : 0 }
{ "name" : "Silence", "_id" : ObjectId("526366b470beb2f27d000001"), "__v" : 0 }
{ "name" : "Silence", "_id" : ObjectId("526366e287add0fe7d000001"), "__v" : 0 }
{ "name" : "Silence", "age" : 10, "_id" : ObjectId("5263677163a5d80d7e000001"), "__v" : 0 }
{ "name" : "Silence", "age" : 10, "_id" : ObjectId("5263677474f35d187e000001"), "__v" : 0 }
{ "name" : "Silence", "age" : 10, "_id" : ObjectId("526367783de3c5237e000001"), "__v" : 0 }
{ "name" : "Silence", "age" : 10, "_id" : ObjectId("526367983c6a5b2f7e000001"), "__v" : 0 }
{ "name" : "Silence", "age" : 10, "_id" : ObjectId("526367ae080b5c3b7e000001"), "__v" : 0 }
{ "name" : "Silence", "age" : 10, "_id" : ObjectId("526367c1ab6cf3477e000001"), "__v" : 0 }
{ "name" : "Silence", "age" : 10, "_id" : ObjectId("52636802f4ac10537e000001"), "__v" : 0 }
{ "name" : "Silence", "age" : 10, "_id" : ObjectId("5263686f6a20e2657e000001"), "__v" : 0 }
>