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PolyBase で外部データソースとしてOpen Exchange Rates を連携利用

CData ODBC Driver for Open Exchange Rates とSQL Server 2019 のPolyBase を使って、リアルタイムOpen Exchange Rates data に外部データソースとしてアクセス。

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 Open Exchange Rates data を組み合わせて使うことで、SQL Server データと同じようにOpen Exchange Rates 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Open Exchange Rates data の設定から、T-SQL クエリを使ったOpen Exchange Rates data へのアクセスを行います。

The CData ODBC drivers offer unmatched performance for interacting with live Open Exchange Rates data using PolyBase due to optimized data processing built into the driver. When you issue complex SQL queries from SQL Server to Open Exchange Rates, the driver pushes down supported SQL operations, like filters and aggregations, directly to Open Exchange Rates 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 Open Exchange Rates data, using a single query to pull data from distributed sources.

Open Exchange Rates 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 Open Exchange Rates Sys is created automatically).

Open Exchange Rates API は、App Id によるBasic 認証をサポートしています。 登録すると、App Id がアカウントダッシュボードに表示されます。 これをAppId 接続プロパティに設定してください。

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

Open Exchange Rates 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 Open Exchange Rates data.

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

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

Create an External Data Source for Open Exchange Rates

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

For Open Exchange Rates, 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_openexchangerates_source
WITH ( 
  LOCATION = 'odbc://SERVERNAME[:PORT]',
  CONNECTION_OPTIONS = 'DSN=CData Open Exchange Rates Sys',
  -- PUSHDOWN = ON | OFF,
  CREDENTIAL = openexchangerates_creds
);

Open Exchange Rates のExternal Table を作成

After creating the external data source, use CREATE EXTERNAL TABLE statements to link to Open Exchange Rates data from your SQL Server instance. The table column definitions must match those exposed by the CData ODBC Driver for Open Exchange Rates. 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 Open Exchange Rates Projects would look similar to the following:

CREATE EXTERNAL TABLE Projects(
  Id [nvarchar](255) NULL,
  Statistics_ViewCount [nvarchar](255) NULL,
  ...
) WITH ( 
  LOCATION='Projects',
  DATA_SOURCE=cdata_openexchangerates_source
);

Having created external tables for Open Exchange Rates 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 Open Exchange Rates, freeing up local resources and computing power. Download a free, 30-day trial of the ODBC Driver for Open Exchange Rates and start working with live Open Exchange Rates data alongside your SQL Server data today.

 
 
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