How to connect PolyBase to Trello

PolyBase for SQL Server allows you to query external data by using the same Transact-SQL syntax used to query a database table. When paired with the CData ODBC Driver for Trello, you get access to your Trello data directly alongside your SQL Server data. This article describes creating an external data source and external tables to grant access to live Trello data using T-SQL queries.

NOTE: PolyBase is only available on SQL Server 19 and above, and only for Standard SQL Server.

The CData ODBC drivers offer unmatched performance for interacting with live Trello data using PolyBase due to optimized data processing built into the driver. When you issue complex SQL queries from SQL Server to Trello, the driver pushes down supported SQL operations, like filters and aggregations, directly to Trello and utilizes the embedded SQL engine to process unsupported operations (often SQL functions and JOIN operations) client-side. And with PolyBase, you can also join SQL Server data with Trello data, using a single query to pull data from distributed sources.

Connect to Trello

If you have not already, first specify connection properties in an ODBC DSN (data source name). This is the last step of the driver installation. You can use the Microsoft ODBC Data Source Administrator to create and configure ODBC DSNs. To create an external data source in SQL Server using PolyBase, configure a System DSN (CData Trello Sys is created automatically).

Trello uses token-based authentication to grant third-party applications access to their API. When a user has granted an application access to their data, the application is given a token that can be used to make requests to Trello's API.

Trello's API can be accessed in 2 different ways. The first is using Trello's own Authorization Route, and the second is using OAuth1.0.

• Authorization Route: At the moment of registration, Trello assigns an API key and Token to the account. See the Help documentation for information on how to connect via the Authorization route.
• OAuth Route: Similar to using Authorization, OAuth creates an Application Id and Secret when you create your account. See the Help documentation for information on how to to connect.

Click "Test Connection" to ensure that the DSN is connected to Trello properly. Navigate to the Tables tab to review the table definitions for Trello.

Create an External Data Source for Trello Data

After configuring the connection, you need to create a master encryption key and a credential database for the external data source.

Creating a Master Encryption Key

Execute the following SQL command to create a new master key, 'ENCRYPTION,' to encrypt the credentials for the external data source.

CREATE MASTER KEY ENCRYPTION BY PASSWORD = 'password';

Creating a Credential Database

Execute the following SQL command to create credentials for the external data source connected to Trello data.

NOTE: Since Trello does not require a User or Password to authenticate, you may use whatever values you wish for IDENTITY and SECRET.

CREATE DATABASE SCOPED CREDENTIAL trello_creds
WITH IDENTITY = 'username', SECRET = 'password';

Create an External Data Source for Trello

Execute a CREATE EXTERNAL DATA SOURCE SQL command to create an external data source for Trello with PolyBase:

• Set the LOCATION parameter , using the DSN and credentials configured earlier.

For Trello, set SERVERNAME to the URL or address for your server (e.g. 'localhost' or '127.0.0.1' for local servers; the remote URL for remote servers). Leave PORT empty. PUSHDOWN is set to ON by default, meaning the ODBC Driver can leverage server-side processing for complex queries.

CREATE EXTERNAL DATA SOURCE cdata_trello_source
WITH ( 
  LOCATION = 'odbc://SERVER_URL',
  CONNECTION_OPTIONS = 'DSN=CData Trello Sys',
  -- PUSHDOWN = ON | OFF,
  CREDENTIAL = trello_creds
);

Create External Tables for Trello

After creating the external data source, use CREATE EXTERNAL TABLE statements to link to Trello data from your SQL Server instance. The table column definitions must match those exposed by the CData ODBC Driver for Trello. You can refer to the Tables tab of the DSN Configuration Wizard to see the table definition.

Sample CREATE TABLE Statement

The statement to create an external table based on a Trello Boards would look similar to the following:

CREATE EXTERNAL TABLE Boards(
  BoardId [nvarchar](255) NULL,
  Name [nvarchar](255) NULL,
  ...
) WITH ( 
  LOCATION='Boards',
  DATA_SOURCE=cdata_trello_source
);

Having created external tables for Trello in your SQL Server instance, you are now able to query local and remote data simultaneously. Thanks to built-in query processing in the CData ODBC Driver, you know that as much query processing as possible is being pushed to Trello, freeing up local resources and computing power. Download a free, 30-day trial of the ODBC Driver for Trello and start working with live Trello data alongside your SQL Server data today.