Advanced algorithms
Available algorithms
uuid_generator

uuid_generator

This module is used to generate string UUIDs which can be stored as properties on nodes or edges. The underlying implementation makes use of the uuid-dev library. When using the uuid module on Linux systems, the library can be installed by running sudo apt-get install uuid-dev.

Source code
TraitValue
Module typeutil
ImplementationC++
Parallelismsequential

Procedures

You can execute this algorithm on graph projections, subgraphs or portions of the graph.

get()

Use the procedure to the the UUID string.

Input:

  • subgraph: Graph (OPTIONAL) ➡ A specific subgraph, which is an object of type Graph returned by the project() function, on which the algorithm is run. If subgraph is not specified, the algorithm is computed on the entire graph by default.

Output:

  • uuid ➡ Returns a UUID string.

Usage:

To get a UUID string, use the following query:

MATCH (n)
CALL uuid_generator.get() YIELD uuid
SET n.uuid = uuid
RETURN n.uuid AS node_uuid;

Example

Database state

The database contains the following data:

Created with the following Cypher queries:

MERGE (a:Node {id: 0}) MERGE (b:Node {id: 1}) CREATE (a)-[:RELATION]->(b);
MERGE (a:Node {id: 1}) MERGE (b:Node {id: 2}) CREATE (a)-[:RELATION]->(b);
MERGE (a:Node {id: 2}) MERGE (b:Node {id: 0}) CREATE (a)-[:RELATION]->(b);

Get UUID 

MATCH (n)
CALL uuid_generator.get() YIELD uuid
SET n.uuid = uuid
RETURN n.uuid AS node_uuid;

Results:

+----------------------------------------+
| node_uuid                              |
+----------------------------------------+
| "ef4722b2-628b-4f93-8667-fc91134ed980" |
| "601faade-8c61-4dc3-a68a-693fed4ad40c" |
| "dc4283b8-90d6-402e-8fc0-f37f9959b593" |
+----------------------------------------+