Neo4j

Intro to Neo4j by Emil Eifram

Core abstractions

• Nodes
• Relationships between nodes
• Properties on both

Example: the matrix

• First Identify the entities
  • node id (mandatory attrib on a node)
  • node attributes
• Nodes (Person) knows (relationships) other node
  • Relationships also have properties (e.g. the "knows" has age = 3 days)
  • can add arbitrary relationships "coded_by"

Code 1 : building a node space

GraphDatabaseService graphDb = ... // get factory (via DI or whatever)

// create Thomas "Neo" Anderson
Node mrAnderson = graphDb.createNode();
mrAnderson.setProperty("name", "Thomas Anderson");
mrAnderson.setProperty("age", 29);

// create Morpheus
Node morpheus = graphDb.createNode();
morpheus.setProperty("name", "Morpheus");
morpheus.setProperty("rank", "Captain");
morpheus.setProperty("occupation", "Total bad ass");

// create a relationship representing that they know each other
mrAnderson.createRelationshipTo(morpheus, RelTypes.KNOWS);

// create Trinity, Cypher, Agent Smith, Architect similarly