+
+ Nodes with key-value properties are connected by typed, directed relationships with properties.
+ + TODO put in a pretty picture + ++start movie=(id) match movie<-[:ACTS_IN]-actor +where actor.age > 20 return movie, actor.name +order by movie.title+
+TraversalDescription actors = Traversal.description()
+ .relationships("ACTS_IN").filter(returnAllButStartNode());
+
+for (Node actors : actors.traverse(movie))
+ ...
+
+
+Transaction tx=graphDatabaseService.beginTx();
+try {
+ ... graph operations ...
+ tx.success();
+} catch(Exception e) {
+ tx.failure();
+} finally {
+ tx.finish();
+}
+
+ + <dependency> + <groupId>org.springframework.data</groupId> + <artifactId>spring-data-neo4j[-aspects]</artifactId> + <version>2.0.0.RC1</version> + </dependency> ++
<beans ... + xmlns:neo4j="http://www.swf.org/schema/data/neo4j" + xsi:schemaLocation= + "http://www.sfw.org/schema/data/neo4j" ...> + +... +<neo4j:config store-dir="graph.db"/> +<neo4j:repositories base-package="com.example.repositories"/> +... +</beans>+
<neo4j:config graphDatabaseService="gds"/> +<bean id="gds" class=”...ImpermanentGraphDatabase/>+
<neo4j:config graphDatabaseService="rds"/> +<bean id="rds" class=”...SpringRestGraphDatabase/>+
@NodeEntity marks a domain class as backed by a node in the graph@RelationshipEntity marks a domain class as backed by a relationship in the graph@GraphId Field for id@Indexed([fulltext=true],[indexName=name]) Auto-Indexing@RelatedTo([direction=Direction], [type=TYPE]) define type and direction of relationship on Entity, Iterable<E>, Set<E> fields@RelatedToVia([direction=Direction], [type=TYPE]) like @RelatedTo, but targets Relationship-Entities@Query(query, [type=QueryType]) computed field, executes graph query in Cypher or Gremlin@GraphTraversal(traversal=~TraversalBuilder.class, [elementClass=Person.class]) computed field, executes traversal starting from entity-node
+@NodeEntity
+public class Movie {
+
+ @GraphId Long id;
+
+ @Indexed(fulltext = true, indexName = "search")
+ String title;
+
+ Person director;
+
+ @RelatedTo(type="ACTS_IN", direction = INCOMING)
+ Set<Person> actors;
+
+ @RelatedToVia(type = "RATED")
+ Iterable<Rating> ratings;
+
+ @Query("start movie=node({self}) match
+ movie-->genre<--similar return similar")
+ Iterable<Movie> similarMovies;
+}
+
+interface MovieRepository extends GraphRepository<Movie> {
+ @Query("start movie={0} match m<-[rating:RATED]-user
+ return rating")
+ Iterable<Rating> getRatings(Movie movie);
+ // Co-Actors
+ Iterable<Person> findByActorsMoviesActorName(name)
+}
+
+<neo4j:repositories base-package="com.example.dao"/>
+
+ +getPersistentState() +relateTo(target, ...), +getRelationshipTo(...) +persist(), +remove(), +detach() +...+
+roo> addon search graph +roo> addon install id --searchResultId 01 +roo> project --topLevelPackage net.cineasts +roo> graph setup --provider NEO4J --databaseLocation cineasts +roo> graph entity --class ~.model.Movie +roo> field string title +roo> graph entity --class ~.model.Actor +roo> field string name +roo> graph relationship --to Movie --from Actor + --fieldName movies --type ACTS_IN --cardinality ONE_TO_MANY +roo> controller all --package ~.web+
org.neo4j:neo4j-rest-graphdb)
+