drapid

NoSQL/hash table classes for Node.js under 4KB and no external dependencies.

Use cases:

• On small and medium Node.js projects where any data has to be stored in a structured way. (Browserify may even extend the support to browsers, but that was not tested yet!)
• High performance is needed for both data insertion and lookup, so the use of hash tables.
• The module is tiny and free of useless bloat allowing the usage on space constraint environments.
• Broader compatibility with the module supporting any array of objects (formatted using JSON) as a valid database.

Installation:

$ npm install @phtdacosta/drapid --save

Basic usage:

// Requires the Drapid module
const Drapid = require('drapid')
// Instantiates the Standard database class
const db = Drapid.Standard('database.json', 'name')

// Includes two objects into the database
db.include({'name':'Rita', 'job':'mage'})
.then(db.include({'name':'Phil', 'job':'mage'}))

// Recovers any object (or objects) from the database
const mages = db.recover('job', 'mage')
// [{'name':'Rita', 'job':'mage'},{'name':'Phil', 'job':'mage'}]

Documentation

NoSQL Standard API

• Easy to use and ideal for most cases.
• Automatically loads the database from disk to memory at startup when supplied with a valid path.

Drapid.Standard({path: absolutePath, key: primaryKey})

Returns an Object instance of the standard class.

Optional: path is the absolute path including the file name which the database can persist in disk.

Optional: key is the main key used to identify every object in database. It is used only when the combine method is called.

include(object)

Returns a Promise along the index value of the object included.

object is any set of keys and their corresponding values.

recover(key, value)

Returns an Array containing all objects matching the given key and the given value even if no object was matched.

key is the object property to look for on each stored object.

value is the required value of the object property.

combine(value, object)

Returns an Array containing the index values of the combined objects.

value is the data associated with the main key attribute shared by all database objects.

object is a key-value pair to be combined with the existing database object.

1. This method requires that a main key has been previously set and that the object to be combined contains it.
2. This method only adds new attributes or modifies existent ones.

exclude(key, value)

Returns an Array containing all objects matching the given key and the given value that were removed or an empty one otherwise.

key is the object property to look for on each stored object.

value is the required value of the object property.

persistSync()

Returns void after synchronously dumping the database from memory into the path previously set or an Error if no path was previously specified.

NoSQL Hash table API

• Extreme performance but high memory use.

Drapid.Hashtable({path: absolutePath, key: primaryKey, size: maxSize})

Returns an Object instance of the hash table class.

Optional: path is the absolute path including the file name which the database can persist in disk.

key is the main key used to identify every object in database. It is required for the hash table to work.

Optional: size sets the maximum quantity of objects the database can store. Default value is 131072.

include(object)

Returns a Promise along the index value of the object included or an Error in case the position to be used is already occupied.

object is any set of keys and their corresponding values.

recover(value)

Returns an Object which value of the primary key is the same as the parameter given or null otherwise.

value is the data associated with the main key attribute shared by all database objects.

combine(value, object)

Returns a number representing the index values of the combined objects.

value is the data associated with the main key attribute shared by all database objects.

exclude(value)

Returns a number which value of the primary key is the same as the parameter given or null otherwise.

value is the data associated with the main key attribute shared by all database objects.

persistSync()

Returns void after synchronously dumping the database from memory into previously set path or an Error if none was previously specified.

persistAsync()

Returns an Promise dumping the database from memory into previously set path or an Error if none was previously specified.

License

This project exists under the MIT license.