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Connect to Cosmos DB Data in CloverETL

Transfer Cosmos DB data using the visual workflow in the CloverETL data integration tool.

The CData JDBC Driver for Cosmos DB enables you to use the data transformation components in CloverETL to execute create, read, update, and delete (CRUD) commands to Cosmos DB data. In this article, you will use the JDBC Driver for Cosmos DB to set up a simple transfer into a flat file.

Connect to Cosmos DB as a JDBC Data Source

  1. Create the connection to Cosmos DB data. In a new CloverETL graph, right-click the Connections node in the Outline pane and click Connections -> Create Connection. The Database Connection wizard is displayed.
  2. Click the plus icon to load a driver from a JAR. Browse to the lib subfolder of the installation directory and select the cdata.jdbc.cosmosdb.jar file.
  3. Enter the JDBC URL. A typical JDBC URL is below: jdbc:cosmosdb:AccountEndpoint=myAccountEndpoint;AccountKey=myAccountKey;

    To obtain the connection string needed to connect to a Cosmos DB account using the SQL API, log in to the Azure Portal, select Azure Cosmos DB, and select your account. In the Settings section, click Connection String and set the following values:

    • AccountEndpoint: The Cosmos DB account URL from the Keys blade of the Cosmos DB account
    • AccountKey: In the Azure portal, navigate to the Cosmos DB service and select your Azure Cosmos DB account. From the resource menu, go to the Keys page. Find the PRIMARY KEY value and set AccountKey to this value.

Query Cosmos DB Data with the DBInputTable Component

  1. Drag a DBInputTable from the Readers selection of the Palette onto the job flow and double-click it to open the configuration editor.
  2. In the DB connection property, select the Cosmos DB JDBC data source from the drop-down menu.
  3. Enter the SQL query. For example: SELECT * FROM Customers

Write the Output of the Query to a UniversalDataWriter

  1. Drag a UniversalDataWriter from the Writers selection onto the jobflow.
  2. Double-click the UniversalDataWriter to open the configuration editor and add a file URL.
  3. Right-click the DBInputTable and then click Extract Metadata.
  4. Connect the output port of the DBInputTable to the UniversalDataWriter.
  5. In the resulting Select Metadata menu for the UniversalDataWriter, choose the Customers table. (You can also open this menu by right-clicking the input port for the UniversalDataWriter.)
  6. Click Run to write to the file.
 
 
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