createNode

Create nodes in Neo4j database

Syntax

createNode(neo4jconn)

createNode(neo4jconn,Name,Value)

nodeinfo = createNode(___)

Description

createNode(neo4jconn) creates a single node without labels and properties by using a Neo4j^® database connection.

createNode(neo4jconn,Name,Value) creates a single node or multiple nodes and returns node information by specifying additional options using one or more name-value pair arguments. For example, 'Labels','Person' creates a node with the label Person.

nodeinfo = createNode(___) returns node information as a Neo4jNode object for one node, or as a table for multiple nodes, using any of the input argument combinations in the previous syntaxes.

Examples

Create Single Node

Create a single node in a Neo4j® database and display the contents of the node.

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 =

     []

Create a single node in the database using the Neo4j database connection.

createNode(neo4jconn)

When you execute the createNode function without any arguments except the Neo4j database connection, the function creates a single node without labels and properties.

Close the database connection.

close(neo4jconn)

Create Single Node with Label

Create a single node with a label in a Neo4j® database and access the node.

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 =

     []

Create a single node with a label in the database by using the Neo4j database connection. Use the 'Labels' name-value pair argument to specify the label Scientist.

label = 'Scientist';
createNode(neo4jconn,'Labels',label)

Search for the new node using the label Scientist.

nodeinfo = searchNode(neo4jconn,label)

nodeinfo = 
  Neo4jNode with properties:

        NodeID: 6
      NodeData: [1×1 struct]
    NodeLabels: 'Scientist'

nodeinfo is a Neo4jNode object with these properties:

• Node identifier

• Node data

• Node labels

Close the database connection.

close(neo4jconn)

Create Two Nodes with Labels

Create two nodes with labels in a Neo4j® database. Access data in the nodes.

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 =

     []

Create two nodes that represent two people in the database by using the Neo4j database connection. Use the 'Labels' name-value pair argument to specify the node labels. One node has the label Person, and the other node has two labels, Person and Employee.

labels = {{'Person'},{'Person','Employee'}};
nodeinfo = createNode(neo4jconn,'Labels',labels)

nodeinfo=2×3 table
          NodeLabels      NodeData                  NodeObject             
          __________    ____________    ___________________________________

    35    'Person'      [1×1 struct]    [1x1 database.neo4j.http.Neo4jNode]
    36    {2×1 cell}    [1×1 struct]    [1x1 database.neo4j.http.Neo4jNode]

nodeinfo is a table with two rows, one for each person. The table contains these variables:

• Node label

• Node data

• Neo4jNode object

Access the Neo4jNode object for the first node.

data = nodeinfo.NodeObject(1)

data = 
  Neo4jNode with properties:

        NodeID: 35
      NodeData: [1×1 struct]
    NodeLabels: 'Person'

data is a Neo4jNode object with these properties:

• Node identifier

• Node data

• Node label

Access the node labels of both nodes.

nodeinfo.NodeObject(1).NodeLabels

ans = 
'Person'

nodeinfo.NodeObject(2).NodeLabels

ans = 2×1 cell array
    {'Person'  }
    {'Employee'}

Close the database connection.

close(neo4jconn)

Create Two Nodes with Labels and Properties

Create two nodes with labels and properties in a Neo4j® database. Access the data in the nodes.

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 =

     []

Create a table with two rows that contain the names and job titles of two people (users).

props = table(["User8";"User9"],["Analyst";"Technician"], ...
    'VariableNames',{'Name','Title'});

Create two nodes that represent these two people in the database by using the Neo4j database connection. Use the 'Labels' name-value pair argument to specify the node labels Person and Employee. Then, use the 'Properties' name-value pair argument to specify the node properties using the props table.

labels = ["Person","Employee"];
nodeinfo = createNode(neo4jconn,'Labels',labels,'Properties',props)

nodeinfo=2×3 table
          NodeLabels      NodeData                  NodeObject             
          __________    ____________    ___________________________________

    28    {2×1 cell}    [1×1 struct]    [1x1 database.neo4j.http.Neo4jNode]
    21    {2×1 cell}    [1×1 struct]    [1x1 database.neo4j.http.Neo4jNode]

nodeinfo is a table with two rows, one for each person. The table contains these variables:

• Node label

• Node data

• Neo4jNode object

Access the properties of the first node. This structure contains the properties of the node as fields and values.

nodeinfo.NodeData{1}

ans = struct with fields:
    Title: 'Analyst'
     Name: 'User8'

Access the Neo4jNode object for the first node.

data = nodeinfo.NodeObject(1)

data = 
  Neo4jNode with properties:

        NodeID: 28
      NodeData: [1×1 struct]
    NodeLabels: {2×1 cell}

data is a Neo4jNode object with these properties:

• Node identifier

• Node data

• Node label

Close the database connection.

close(neo4jconn)

Input Arguments

neo4jconn — Neo4j database connection

Neo4jConnect object

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

Name-Value Pair Arguments

Specify optional comma-separated pairs of Name,Value arguments. Name is the argument name and Value is the corresponding value. Name must appear inside quotes. You can specify several name and value pair arguments in any order as Name1,Value1,...,NameN,ValueN.

Example: node = createNode(neo4jconn,'Labels','Person','Properties',table(["User8"],["Analyst"],'VariableNames',{'Name','Title'})) creates a single node with the label Person and two properties, Name and Title, with their corresponding values, User8 and Analyst.

'Labels' — Node labels

character vector | string scalar | cell array of character vectors | string array | cell array of cell arrays | cell array of string arrays

Node labels, specified as the comma-separated pair consisting of 'Labels' and a character vector, string scalar, cell array of character vectors, string array, cell array of cell arrays, or cell array of string arrays. To specify one node label, use a character vector or string scalar. For multiple node labels, use a cell array of character vectors or a string array. To create multiple nodes with different labels, use a cell array of cell arrays or a cell array of string arrays.

Note

If you do not specify any labels, then the created node has no labels by default.

Example: 'Labels','Person'

Data Types: char | string | cell

'Properties' — Node properties

structure | structure array | table | cell array of structures

Node properties, specified as the comma-separated pair consisting of 'Properties' and a structure, structure array, table, or cell array of structures.

When you specify a structure, the createNode function converts each field and its corresponding value to a property and its corresponding value in the database node. The function also sets the NodeData property of the Neo4jNode object to this structure.

When you specify a table that contains one row, the createNode function converts each variable and its corresponding value to a property and its corresponding value in the database node. The function also converts the variables and their corresponding values to fields and their corresponding values in a structure. The function sets this structure to the NodeData property of the Neo4jNode object.

To create multiple nodes, specify a structure array or table with multiple rows.

To create multiple nodes with different properties, specify a cell array of structures.

Note

If a property is missing its corresponding value, then the created node does not contain this property.

Data Types: struct | table | cell

Output Arguments

nodeinfo — Node information

Neo4jNode object | table

Node information in the Neo4j database, returned as a Neo4jNode object for one node or as a table for multiple nodes.

For multiple nodes, the table contains these variables:

• NodeLabels — Cell array of character vectors that contains the node labels for each database node

• NodeData — Cell array of structures that contains node information such as property keys

• NodeObject — Neo4jNode object for each database node

The row names of the table are Neo4j node identifiers of each database node.