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neo4j-fiber

1.0.4 • Public • Published

Package Quality Join the chat at https://gitter.im/VeliovGroup/neo4j-fiber

Most advanced, well documented and efficient REST client for Neo4j database, with 100% tests coverage. Fibers allows to give a new level experience to developers, no more callback-hell and blocking operations. Speed and low resources consumption is top priority of neo4j-fiber package.

  • 100% tests coverage
  • Version for Meteor.js - https://atmospherejs.com/ostrio/neo4jdriver
  • This this library is heavily depends from Fibers, so you required to wrap all code into Fiber, see example
  • This package uses batch operations to perform queries. Batch operations lets you execute multiple API calls through a single HTTP call. This improves performance for large insert and update operations significantly
  • This package was tested and works like a charm with GrapheneDB
  • To find more about how to use Cypher read Neo4j cheat sheet

Installation

npm install --save neo4j-fiber

Demo Apps

API:

Please see full API with examples in our wiki

Basic Usage Examples

Connect to Neo4j

const Neo4jDB = require('neo4j-fiber').Neo4jDB;
const db = new Neo4jDB('http://localhost:7474', {
  username: 'neo4j',
  password: '1234'
});

Set connection URL via environment variables

Set NEO4J_URL or GRAPHENEDB_URL to as connection URL to Neo4j Database

NEO4J_URL="http://neo4j:1234@localhost:7474" node index.js

If environment variable is set, no need to pass url argument into Neo4jDB constructor

const Neo4jDB = require('neo4j-fiber').Neo4jDB;
const db = new Neo4jDB();

Run simple query

const cursor = db.query('CREATE (n:City {props}) RETURN n', {
  props: {
    title: 'Ottawa',
    lat: 45.416667,
    long: -75.683333
  }
});
 
console.log(cursor.fetch());
// Returns array of nodes:
// [{
//   n: {
//     long: -75.683333,
//     lat: 45.416667,
//     title: "Ottawa",
//     id: 8421,
//     labels": ["City"],
//     metadata: {
//       id: 8421,
//       labels": ["City"]
//     }
//   }
// }]
 
// Iterate through results as plain objects:
cursor.forEach((node) => {
  console.log(node)
  // Returns node as Object:
  // {
  //   n: {
  //     long: -75.683333,
  //     lat: 45.416667,
  //     title: "Ottawa",
  //     id: 8421,
  //     labels": ["City"],
  //     metadata: {
  //       id: 8421,
  //       labels": ["City"]
  //     }
  //   }
  // }
});
 
// Iterate through cursor as `Neo4jNode` instances:
cursor.each((node) => {
  console.log(node.n.get());
  // {
  //   long: -75.683333,
  //   lat: 45.416667,
  //   title: "Ottawa",
  //   id: 8421,
  //   labels": ["City"],
  //   metadata: {
  //     id: 8421,
  //     labels": ["City"]
  //   }
  // }
});

Create node

const node  = db.nodes();
const node2 = db.nodes({property: 'value', property2: ['val', 'val2', 'val3']});

Get node by id

const node = db.nodes(123);

Delete node

node.delete();

Create relationship

const n1 = db.nodes();
const relationship = db.nodes().to(n1, "KNOWS", {property: 'value'});

Delete relationship

relationship.delete();

Cities example

// Create some data:
const cities = {};
cities['Zürich'] = db.nodes({
  title: 'Zürich',
  lat: 47.27,
  long: 8.31
}).label(['City']);
 
cities['Tokyo'] = db.nodes({
  title: 'Tokyo',
  lat: 35.40,
  long: 139.45
}).label(['City']);
 
cities['Athens'] = db.nodes({
  title: 'Athens',
  lat: 37.58,
  long: 23.43
}).label(['City']);
 
cities['Cape Town'] = db.nodes({
  title: 'Cape Town',
  lat: 33.55,
  long: 18.22
}).label(['City']);
 
 
// Add relationship between cities
// At this example we set distance
cities['Zürich'].to(cities['Tokyo'], "DISTANCE", {m: 9576670, km: 9576.67, mi: 5950.67});
cities['Tokyo'].to(cities['Zürich'], "DISTANCE", {m: 9576670, km: 9576.67, mi: 5950.67});
 
// Create route 1 (Zürich -> Athens -> Cape Town -> Tokyo)
cities['Zürich'].to(cities['Athens'], "ROUTE", {m: 1617270, km: 1617.27, mi: 1004.93, price: 50});
cities['Athens'].to(cities['Cape Town'], "ROUTE", {m: 8015080, km: 8015.08, mi: 4980.34, price: 500});
cities['Cape Town'].to(cities['Tokyo'], "ROUTE", {m: 9505550, km: 9505.55, mi: 5906.48, price: 850});
 
// Create route 2 (Zürich -> Cape Town -> Tokyo)
cities['Zürich'].to(cities['Cape Town'], "ROUTE", {m: 1617270, km: 1617.27, mi: 1004.93, price: 550});
cities['Cape Town'].to(cities['Tokyo'], "ROUTE", {m: 9576670, km: 9576.67, mi: 5950.67, price: 850});
 
// Create route 3 (Zürich -> Athens -> Tokyo)
cities['Zürich'].to(cities['Athens'], "ROUTE", {m: 1617270, km: 1617.27, mi: 1004.93, price: 50});
cities['Athens'].to(cities['Tokyo'], "ROUTE", {m: 9576670, km: 9576.67, mi: 5950.67, price: 850});
 
// Get Shortest Route (in km) between two Cities:
const shortest  = cities['Zürich'].path(cities['Tokyo'], "ROUTE", {cost_property: 'km', algorithm: 'dijkstra'})[0];
let shortestStr = 'Shortest from Zürich to Tokyo, via: ';
shortest.nodes.forEach((id) => {
  shortestStr += db.nodes(id).property('title') + '';
});
 
shortestStr += '| Distance: ' + shortest.weight + ' km';
console.info(shortestStr); // <-- Shortest from Zürich to Tokyo, via: Zürich, Cape Town, Tokyo, | Distance: 11122.82 km
 
// Get Cheapest Route (in notional currency) between two Cities:
const cheapest  = cities['Zürich'].path(cities['Tokyo'], "ROUTE", {cost_property: 'price', algorithm: 'dijkstra'})[0];
let cheapestStr = 'Cheapest from Zürich to Tokyo, via: ';
cheapest.nodes.forEach((id) => {
  cheapestStr += db.nodes(id).property('title') + '';
});
 
cheapestStr += '| Price: ' + cheapest.weight + ' nc';
console.info(cheapestStr); // <-- Cheapest from Zürich to Tokyo, via: Zürich, Athens, Tokyo, | Price: 900 nc

For more complex examples and docs, please see our wiki

install

npm i neo4j-fiber

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0

version

1.0.4

license

BSD 3-Clause

homepage

github.com

repository

Gitgithub

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