smalltable

An on-disk key-value store with very few features

npm install smalltable

Usage

var smalltable = require('smalltable')
var db = smalltable('my.db', {
  hash: 'sha1', // use sha1 to hash the keys
  valueLength: 5 // values take up 5 bytes
})

db.put('hello', 'world', function (err) {
  if (err) throw err
  db.get('hello', function (err, value) {
    if (err) throw err
    console.log('hello -> ' + value)
  })
})

API

db = smalltable(filename, options)

Create a new db instance. The data will stored in a file called filename.

Options include:

{
  hash: 'sha1',    // optional key hashing algorithm
  keyLength: 5,    // optional key byte length
  valueLength: 5,  // value byte length
  values: 128,     // optional inital value count
  truncate: false  // optional truncate the database
}

If you don't specify hash you have to specify keyLength. If you store more than values values the database will be automatically expanded to contain more values. Currently this requires re-indexing all values stored in the database.

db.put(key, value, [cb])

Store a value. If the value if less than valueLength it will be zero-padded.

db.get(key, cb)

Retrive a value. Callback is called with cb(err, buffer). If the key isn't found an error is returned.

db.del(key, [cb])

Delete a value

db.flush(cb)

Flushes the database by performing an fsync on the underlying file descriptor

db.close(cb)

Closes the underlying file descriptor.

stream = db.list()

Get a stream of all values {key: key, value: value} in the database. If hash was set in the constructor the key will be the hash of the key.

License

MIT