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Search Neo4j relationship by relationship identifier



relationinfo = searchRelationByID(neo4jconn,relationid) returns the Neo4j® relationship specified by the relationship identifier using the Neo4j database connection.


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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.

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:

  • Relationship identifier

  • Relationship data

  • Start node identifier

  • Relationship type

  • End node identifier

Display the relationship type.

ans = 

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:

  • Start node identifier

  • Relationship type

  • End node identifier

  • Relationship data

  • Neo4jRelation object

Close the database connection.


Input Arguments

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Neo4j database connection, specified as a Neo4jConnect object created with the function neo4j.

Relationship identifier, specified as a numeric scalar for a single relationship or numeric vector for multiple relationships.

Example: [15,16]

Data Types: double

Output Arguments

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Relationship information, returned as a Neo4jRelation object for one relationship or as a table for multiple relationships.

For multiple relationships, the table contains these variables:

  • StartNodeID — Node identifier of the start node for each matched relationship

  • RelationType — Character vector that denotes the relationship type for each matched relationship

  • EndNodeID — Node identifier of the end node for each matched relationship

  • RelationData — Structure array that contains property keys associated with each matched relationship

  • RelationObjectNeo4jRelation object for each matched relationship

The row names in the table are Neo4j relationship identifiers.

Version History

Introduced in R2018a