neo4j-ogm

:version: 4.0.11

image:https://github.com/neo4j/neo4j-ogm/actions/workflows/maven.yml/badge.svg[https://github.com/neo4j/neo4j-ogm/actions/workflows/maven.yml] image:https://img.shields.io/maven-central/v/org.neo4j/neo4j-ogm.svg[Maven Central,link=http://search.maven.org/#search%7Cga%7C1%7Cg%3A%22org.neo4j%22%20AND%20a%3A%22neo4j-ogm%22] image:https://rawgit.com/aleen42/badges/master/src/stackoverflow.svg[stackoverflow,link=https://stackoverflow.com/questions/tagged/neo4j-ogm]

= Neo4j-OGM - An Object Graph Mapping Library for Neo4j.

Neo4j-OGM is a fast object-graph mapping library for https://neo4j.com/[Neo4j], optimised for server-based installations utilising https://neo4j.com/developer/cypher-query-language/[Cypher].

It aims to simplify development with the Neo4j graph database and like JPA, it uses annotations on simple POJO domain objects.

Please have a look at the current supported versions and which combinations we recommend: https://github.com/neo4j/neo4j-ogm/wiki/Versions[Recommended versions]

== Quick start

=== Dependencies for Neo4j-OGM

==== Maven

[source,xml,subs="verbatim,attributes"]

org.neo4j
neo4j-ogm-bolt-driver
{version}

==== Gradle

[source,xml,subs="verbatim,attributes"]

dependencies {
compile 'org.neo4j:neo4j-ogm-core:{version}'
compile 'org.neo4j:neo4j-ogm-bolt-driver:{version}'
}

=== Set up domain entities

[source,java]

@NodeEntity public class Actor {

@Id @GeneratedValue
private Long id;
private String name;

@Relationship(type = "ACTS_IN", direction = Relationship.OUTGOING)
private Set<Movie> movies = new HashSet<>();

public Actor() {
}

public Actor(String name) {
	this.name = name;
}

public void actsIn(Movie movie) {
	movies.add(movie);
	movie.getActors().add(this);
}

}

@NodeEntity public class Movie {

@Id @GeneratedValue
private Long id;
private String title;
private int released;

public Movie() {
}

public Movie(String title, int year) {
	this.title = title;
	this.released = year;
}

}

=== Configuration

The either configure Neo4j-OGM with properties files, or programmatically.

Please see examples http://neo4j.com/docs/ogm-manual/current/reference/#reference:configuration[here].

=== Persist/Load entities

[source,java]

//Set up the Session SessionFactory sessionFactory = new SessionFactory(configuration, "movies.domain"); Session session = sessionFactory.openSession();

Movie movie = new Movie("The Matrix", 1999);

Actor keanu = new Actor("Keanu Reeves"); keanu.actsIn(movie);

Actor carrie = new Actor("Carrie-Ann Moss"); carrie.actsIn(movie);

//Persist the movie. This persists the actors as well. session.save(movie);

//Load a movie
Movie matrix = session.load(Movie.class, movie.getId());
for(Actor actor : matrix.getActors()) {
System.out.println("Actor: " + actor.getName());
}

== Integrations within other frameworks

We do offer two offical integrations:

• The https://github.com/neo4j/neo4j-ogm-quarkus[Neo4j-OGM Quarkus Extension], which works nicely with Quarkus' "do everything and then some" at buildtime-approach
• The https://github.com/neo4j/neo4j-ogm-spring[Neo4j-OGM Spring Data fork], which provides continued support for Spring Data Neo4j 5, but for modern Spring versions

== Getting Help

The http://neo4j.com/docs/ogm-manual/current/[reference guide] is the best place to get started.

You can also post questions in our https://community.neo4j.com/c/drivers-stacks/spring-data-neo4j-ogm[community forums] or on http://stackoverflow.com/questions/tagged/neo4j-ogm[StackOverflow].

== Building locally

To use the latest development version, just clone this repository and run mvn clean install.

The tests default to Bolt. If you want to change this, you have to define the property ogm.properties when calling Maven. e.g. ./mvnw clean verify -Dogm.properties=ogm-bolt.properties.

For testing we are using https://www.testcontainers.org/[TestContainers]. The default image right now is neo4j:5. If you want to use other images or the enterprise edition, you have to opt-in.

Here is a list of the possible environment variables you can provide.

[options="header"] |=== |Variable |Description |Default value |NEO4J_OGM_NEO4J_ACCEPT_AND_USE_COMMERCIAL_EDITION |Use enterprise edition and accept the Neo4j licence agreement. |no |NEO4J_OGM_NEO4J_IMAGE_NAME |Image to be used by TestContainers. |neo4j:5 |===

== License

Neo4j-OGM and it's modules are licensed under the Apache License v 2.0.

The only exception is the neo4j-embedded-driver which is GPL v3 due to the direct use of the Neo4j Java API.