Retrieving a Neo4j schema - 7.1

Talend Real-time Big Data Platform Studio User Guide

author
Talend Documentation Team
EnrichVersion
7.1
EnrichProdName
Talend Real-Time Big Data Platform
task
Design and Development
EnrichPlatform
Talend Studio

About this task

In this step, we will retrieve the schema of interest from the connected Neo4j database.

Procedure

  1. In the Repository view, right-click the newly created connection and select Retrieve Schema from the contextual menu.
    The wizard opens a new view for schema generation based on a Cypher query.
  2. In the Cypher field, enter your Cypher query to match the nodes and retrieve the properties of interest.
    Warning:

    If your Cypher query includes strings, enclose your strings between single quotation marks instead of double ones, which will cause errors in Neo4j components dropped from your centralized metadata.

    In this example, the following query is used to match nodes labelled Employees and retrieve their properties ID, Name, HireDate, Salary, and ManagerID as schema columns:
    MATCH (n:Employees) RETURN n.ID, n.Name, n.HireDate, n.Salary, n.ManagerID;
    If you want to retrieve all the properties of nodes labelled Employees in this example, you can enter a query like this:
    MATCH (n:Employees) RETURN n;
    or:
    MATCH (n:Employees) RETURN *;
  3. Click Next to proceed to the next step of the wizard where you can edit the generated schema.
    Modify the schema if needed. You can rename the schema, and customize the schema structure according to your needs in the Schema area.
    The tool bar allows you to add, remove or move columns in your schema, or replace the schema with the schema defined in an XML file.
    To add a new schema, click the Add Schema button in the Schema panel, which creates an empty schema for you to define.
    To remove a schema, select the schema name in the Schema panel and click the Remove Schema button.
  4. Click Finish to complete the schema creation. The result schema appears under your Neo4j connection in the Repository view. You can now drop the connection or any schema node under it onto your design workspace as a Neo4j component, with all the metadata information automatically filled.
    If you need to further edit a schema, right-click the schema and select Edit Schema from the contextual menu to open this wizard again and make your modifications.
    Warning:

    If you modify the schemas, ensure that the data type in the Type column is correctly defined.