Connect to Google Spanner Data in HULFT Integrate

HULFT Integrate is a modern data integration platform that provides a drag-and-drop user interface to create cooperation flows, data conversion, and processing so that complex data connections are easier than ever to execute. When paired with the CData JDBC Driver for Google Spanner, HULFT Integrate can work with live Google Spanner data. This article walks through connecting to Google Spanner and moving the data into a CSV file.

With built-in optimized data processing, the CData JDBC Driver offers unmatched performance for interacting with live Google Spanner data. When you issue complex SQL queries to Google Spanner, the driver pushes supported SQL operations, like filters and aggregations, directly to Google Spanner and utilizes the embedded SQL engine to process unsupported operations client-side (often SQL functions and JOIN operations). Its built-in dynamic metadata querying allows you to work with and analyze Google Spanner data using native data types.

Enable Access to Google Spanner

To enable access to Google Spanner data from HULFT Integrate projects:

1. Copy the CData JDBC Driver JAR file (and license file if it exists), cdata.jdbc.googlespanner.jar (and cdata.jdbc.googlespanner.lic), to the jdbc_adapter subfolder for the Integrate Server
2. Restart the HULFT Integrate Server and launch HULFT Integrate Studio

Build a Project with Access to Google Spanner Data

Once you copy the JAR files, you can create a project with access to Google Spanner data. Start by opening Integrate Studio and creating a new project.

1. Name the project
2. Ensure the "Create script" checkbox is checked
3. Click Next
4. Name the script (e.g.: GoogleSpannertoCSV)

Once you create the project, add components to the script to copy Google Spanner data to a CSV file.

Configure an Execute Select SQL Component

Drag an "Execute Select SQL" component from the Tool Palette (Database -> JDBC) into the Script workspace.

1. In the "Required settings" tab for the Destination, click "Add" to create a new connection for Google Spanner. Set the following properties:
   • Name: Google Spanner Connection Settings
   • Driver class name: cdata.jdbc.googlespanner.GoogleSpannerDriver
   • URL: jdbc:googlespanner:ProjectId='project1';InstanceId='instance1';Database='db1';InitiateOAuth=GETANDREFRESH
     
     

     Built-in Connection String Designer

     For assistance constructing the JDBC URL, use the connection string designer built into the Google Spanner JDBC Driver. Either double-click the JAR file or execute the JAR file from the command-line.

     java -jar cdata.jdbc.googlespanner.jar

     Fill in the connection properties and copy the connection string to the clipboard.

     Google Spanner uses the OAuth authentication standard. To authenticate using OAuth, you can use the embedded credentials or register an app with Google.

     See the Getting Started guide in the CData driver documentation for more information.

2. Write your SQL statement. For example:

   SELECT Name, TotalDue FROM Customer

3. Click "Extraction test" to ensure the connection and query are configured properly
4. Click "Execute SQL statement and set output schema"
5. Click "Finish"

Configure a Write CSV File Component

Drag a "Write CSV File" component from the Tool Palette (File -> CSV) onto the workspace.

1. Set a file to write the query results to (e.g. Customer.csv)
2. Set "Input data" to the "Select SQL" component
3. Add columns for each field selected in the SQL query
4. In the "Write settings" tab, check the checkbox to "Insert column names into first row"
5. Click "Finish"

Map Google Spanner Fields to the CSV Columns

Map each column from the "Select" component to the corresponding column for the "CSV" component.

Finish the Script

Drag the "Start" component onto the "Select" component and the "CSV" component onto the "End" component. Build the script and run the script to move Google Spanner data into a CSV file.

Download a free, 30-day trial of the CData JDBC Driver for Google Spanner and start working with your live Google Spanner data in HULFT Integrate. Reach out to our Support Team if you have any questions.