PolyBase で外部データソースとしてTrello を連携利用

SQL Server のPolyBase は、データベーステーブルをクエリするTransact-SQL シンタックスを使って、外部データにクエリする仕組みです。 CData ODBC Drivers for Trello data を組み合わせて使うことで、SQL Server データと同じようにTrello data へのアクセスが可能です。 本記事では、PolyBase 外部データソースへのTrello data の設定から、T-SQL クエリを使ったTrello data へのアクセスを行います。

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.

Trello への接続

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 は、トークンベース認証を使用して、サードパーティアプリケーションにAPI へのアクセスを許可します。ユーザーがアプリケーションにデータへのアクセスを許可すると、アプリケーションにはTrello のAPI へのリクエストに使用できるトークンが付与されます。 Trello のAPI には2通りの方法でアクセスできます。1つ目はTrello 独自の認可ルートで、2つ目はOAuth1.0 を使用する方法です。

• 認可ルート: 登録の時点で、Trello はAPI キーとトークンをアカウントに割り当てます。認可ルート経由で接続する方法については、ヘルプドキュメントの「認可ルートの使用」を参照してください。
• OAuth ルート: 認可の使用と同様に、OAuth は、アカウントの作成時にApplication Id とSecret を作成します。接続方法については、ヘルプドキュメントの「OAuth 認証の使用」を参照してください。

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.

Trello Data の外部データソースの作成

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 the following SQL command to create an external data source for Trello with PolyBase, using the DSN and credentials configured earlier.

For Trello, set SERVERNAME to 'localhost' or '127.0.0.1' and 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://SERVERNAME[:PORT]',
  CONNECTION_OPTIONS = 'DSN=CData Trello Sys',
  -- PUSHDOWN = ON | OFF,
  CREDENTIAL = trello_creds
);

Trello のExternal Table を作成

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.