No, logic programming as embodied by those things and neo4j are quite different. On one level, you’re right that they conceptually both amount to graph storage and graph query. But for logic programming, it’s only conceptually graph query, there’s no guarantee that it’s actually stored that way (where with neo4j, it is). Second, with logic … Read more
Depending on environment and installation type you need to look for a file named auth under directory dbms and remove it. In MacOs, for dmg installations (adjust for custom locations): /Users/xyz/Documents/Neo4j/default.graphdb/dbms/auth or (homebrew install) /usr/local/Cellar/neo4j/x.x.x/libexec/data/dbms/auth Windows users should look for same file in the default.graphdb/dbms directory. In Ubuntu /var/lib/neo4j/data/dbms/auth In docker containers /var/lib/neo4j/data/dbms/auth Alternatively, you … Read more
In more recent terms as of Gremlin 2.3.0, removal of all vertices would be best accomplished with: g.V.remove() UPDATE: For version Gremlin 3.x you would use drop(): gremlin> graph = TinkerFactory.createModern() ==>tinkergraph[vertices:6 edges:6] gremlin> g = graph.traversal() ==>graphtraversalsource[tinkergraph[vertices:6 edges:6], standard] gremlin> g.V().drop().iterate() gremlin> graph ==>tinkergraph[vertices:0 edges:0] Note that drop() does not automatically iterate the Traversal … Read more
Available in version >3.1 Enterprise with CALL dbms.listQueries() CALL dbms.killQuery(queryId) Admins may “kill’em all” There is also :queries
When using MERGE on full patterns, the behavior is that either the whole pattern matches, or the whole pattern is created. MERGE will not partially use existing patterns — it’s all or nothing. If partial matches are needed, this can be accomplished by splitting a pattern up into multiple MERGE clauses. http://docs.neo4j.org/chunked/stable/query-merge.html MERGE (n)-[:know {r:’123′}]->(test2 {name:’2′}) will … Read more
Yes, you can do something like: match (gal:Person{name:”Yoav”})-[:liked|:watched|:other]->(movie:Movie) return movie Take a look in the docs: Match on multiple relationship types EDIT: From the comments: I need “and” between the relation types.. you gave me an “or” In this case, you can do: match (Yoav:Person{name:”Yoav”})-[:liked]->(movie:Movie), (Yoav)-[:watched]->(movie), (Yoav)-[:other]->(movie) return movie
No, there isn’t. All relationships in neo4j have a direction, starting and ending at a given node. There are a small number of workarounds. Firstly, as you’ve suggested, we can either have two relationships, one going from A to B and the other from B to A. Alternatively, when writing our MATCH query, we can … Read more
You can use the browser instead of the API. Just go to http://localhost:7474 (or whatever IP to which the web console is bound) and you will be prompted to change the password. Once authenticated, use the command :server change-password to change the password again. It is not yet possible to create multiple user accounts within … Read more
As Michael Hunger mentioned MATCH (n) WHERE NOT EXISTS(n.foo) RETURN n On older versions of Neo4j you can use HAS: # Causes error with later versions of Neo4j MATCH (n) WHERE NOT HAS(n.foo) RETURN n
The easiest is to start the neo4j server and view your graph via the webadmin: http://docs.neo4j.org/chunked/stable/tools-webadmin.html