Teensy

At just 1.5k and less than 100 lines of JS, Teensy is a very small flat file database.

Performance Metrics

100 Item:

• Seek 1 results: 47μs (0.047ms)
• Put one item: 150μs (0.150ms)

5,000 Item:

• Seek 5,000 results: 4.250ms
• Put one item: 0.525ms

50,000 Item:

• Seek 50,000 results: 21.713ms
• Put one item: 2ms

100,000 Item:

• Seek 50,000 results: 47.450ms
• Put one item: 3ms

Metrics gathered on 2015 MacBook 12" running Node v5.3.0. Requests made every 50ms.

How Teensy Works

Teensy stores data in memory and writes it to a file periodically (defined when you create a new Teensy DB). Teensy will then look for that file and load it into memory next time it's initialized.

Usage

Install using npm. Teensy requires ES6 features to be enabled, Use of node 5.3.0+ is recommended.

npm install --save teensy

First, require teensy.

const Teensy = require('teensy');

Create your database, specifying your db filename, and storage interval. Be sure to include the store() call, this is how Teensy stores stuff!

let DB = new Teensy('teensy.db', 1000).store();

Easily put data into Teensy. id and rev required.

DB.put({_id: 'Ringo', _rev: 2, color: 'Orange', fangs: true});

You can find data just as easily. Simply provide query params to .seek().

let seekData = DB.seek({_id: 'Ringo', fangs: true});

You can subscribe to changes in the DB.

DB.subscribe((data) => {
  // do stuff
}, 'subscription_id');

You can also unsubscribe.

DB.unsubscribe('subscription_id');

If you want data gone, simply use .poof() while passing a query.

DB.poof({color: 'Orange'});