Search for a single relationship or multiple relationships by using relationship identifiers in the Neo4j® database.

Assume that you have graph data stored in a Neo4j database that represents a social neighborhood. This database has seven nodes and eight relationships. Each node has only one unique property key name with a value ranging from User1 through User7. Each relationship has the type knows.

Create a Neo4j database connection using the URL http://localhost:7474/db/data, user name neo4j, and password matlab.

url = 'http://localhost:7474/db/data';
username = 'neo4j';
password = 'matlab';

neo4jconn = neo4j(url,username,password);

Check the Message property of the Neo4j connection object neo4jconn. The blank Message property indicates a successful connection.

neo4jconn.Message

ans =

     []

Search for the relationship with the identifier 8 by using the Neo4j database connection.

relationid = 8;
relationinfo = searchRelationByID(neo4jconn,relationid)

relationinfo = 
  Neo4jRelation with properties:

      RelationID: 8
    RelationData: [1×1 struct]
     StartNodeID: 5
    RelationType: 'knows'
       EndNodeID: 9

relationinfo is a Neo4jRelation object with these properties:

Display the relationship type.

relationinfo.RelationType

ans = 
'knows'

Search for multiple relationships with the identifiers 4, 5, and 6 by using the Neo4j database connection.

relationid = [4,5,6];
relationinfo = searchRelationByID(neo4jconn,relationid)

relationinfo=3×5 table
         StartNodeID    RelationType    EndNodeID    RelationData                RelationObject             
         ___________    ____________    _________    ____________    _______________________________________

    5         3           'knows'           4        [1×1 struct]    [1x1 database.neo4j.http.Neo4jRelation]
    4         3           'knows'           5        [1×1 struct]    [1x1 database.neo4j.http.Neo4jRelation]
    6         5           'knows'           4        [1×1 struct]    [1x1 database.neo4j.http.Neo4jRelation]

relationinfo is a table with these variables:

Close the database connection.

close(neo4jconn)