Node嵌入式數據庫：NeDB

用于Node.js應用的嵌入式持久數據庫，采用Javascript開發，沒有任何依賴(當然除了NPM模塊)。你可以把它想象成用于Node.js項目的SQLite數據庫。其 API 是MongoDB的一個子集。您可以使用它作為一個持久性或只存在內存中的數據存儲。

NeDB并不旨在替換大型的數據庫如MongoDB。它的目標是為你提供一個簡潔，簡單的方法來查詢數據，并堅持久化到磁盤中，適合于那些沒有很多并發連接的Web應用，比如一個持續集成和部署服務器與利用Node Webkit構建的桌面應用。

// Type 1: In-memory only datastore (no need to load the database)
var Datastore = require('nedb')
  , db = new Datastore();


// Type 2: Persistent datastore with manual loading
var Datastore = require('nedb')
  , db = new Datastore({ filename: 'path/to/datafile' });
db.loadDatabase(function (err) {    // Callback is optional
  // Now commands will be executed
});


// Type 3: Persistent datastore with automatic loading
var Datastore = require('nedb')
  , db = new Datastore({ filename: 'path/to/datafile', autoload: true });
// You can issue commands right away


// Type 4: Persistent datastore for a Node Webkit app called 'nwtest'
// For example on Linux, the datafile will be ~/.config/nwtest/nedb-data/something.db
var Datastore = require('nedb')
  , path = require('path')
  , db = new Datastore({ filename: path.join(require('nw.gui').App.dataPath, 'something.db') });


// Of course you can create multiple datastores if you need several
// collections. In this case it's usually a good idea to use autoload for all collections.
db = {};
db.users = new Datastore('path/to/users.db');
db.robots = new Datastore('path/to/robots.db');

// You need to load each database (here we do it asynchronously)
db.users.loadDatabase();
db.robots.loadDatabase();

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