File DB

File DB is a (very limited) document database that uses directories and files to store its data, supporting nested key-value objects in named collections.

Note: It does not support storage of arrays. Give it objects with keys and values.

Usage

The following code assumes you have installed file-db via npm and have this at the top of your file:

var fdb = require('file-db');

fdb

The main file-db lets you open a database.

Open a database

To open a connection to the database, use open, passing a path and a callback. The callback receives an error parameter and a connection object.

fdb.open('tmp/example', function (err, db) {
  // . . .
  // Do your database stuff
  // . . .
});

Connection

Connection objects allow you to choose a collection to query.

Query a collection

The use method chooses a collection and returns a query object that you can use to query that collection.

var query = db.use('users');

Query

Query objects are tied to a specific collection, allowing you to choose how to query it.

Running a query

Whatever the query object, you can run it using the exec method:

query.exec(function (err, documents) {
  // Use the documents
});

Find all documents in a collection

The find method sets up the query to retrieve all documents from a collection.

query.find()
     .exec(doSomethingWithIt);

Find a document by _id

The find method sets up the query to retrieve all documents from a collection.

query.findById('some-id')
     .exec(doSomethingWithIt);

Saving data

The save method is an upsert for one document. That means it will create data you give it if it doesn't exist, and will generate an _id for the document if you don't give it one.

If you do give save an _id and the data does exist it will update the document.

save can be called multiple times – it appends to the data you've already added.

New document

db.use('users')
  .save({ name: 'Tom' })
  .exec(doSomething);

New document with id

db.use('users')
  .save({ _id: 'abc123' })
  .save({ name: 'Tom' })
  .exec(doSomething);

Update existing document

db.use('users')
  .save({
    _id: 'abc123',
    name: 'phuu'
  })
  .exec(doSomething);

Install

To install file-db, use npm:

npm install file-db

License

MIT

leftlogic/file-db

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