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PolyBase で外部データソースとしてExcel Services を連携利用

CData ODBC Driver for Excel Services とSQL Server 2019 のPolyBase を使って、リアルタイムExcel Services 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 Excel Services data を組み合わせて使うことで、SQL Server データと同じようにExcel Services 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Excel Services data の設定から、T-SQL クエリを使ったExcel Services data へのアクセスを行います。

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

Excel Services 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 Excel Services Sys is created automatically).

The URL, User, and Password properties, under the Authentication section, must be set to valid credentials for SharePoint Online, SharePoint 2010, or SharePoint 2013. Additionally, the Library property must be set to a valid SharePoint Document Library and the File property must be set to a valid .xlsx file in the indicated Library.

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

Excel Services 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 Excel Services data.

NOTE: IDENTITY and SECRET correspond with the User and Password properties for Excel Services.

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

Create an External Data Source for Excel Services

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

For Excel Services, 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_excelservices_source
WITH ( 
  LOCATION = 'odbc://SERVERNAME[:PORT]',
  CONNECTION_OPTIONS = 'DSN=CData Excel Services Sys',
  -- PUSHDOWN = ON | OFF,
  CREDENTIAL = excelservices_creds
);

Excel Services のExternal Table を作成

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

CREATE EXTERNAL TABLE Account(
  Name [nvarchar](255) NULL,
  AnnualRevenue [nvarchar](255) NULL,
  ...
) WITH ( 
  LOCATION='Account',
  DATA_SOURCE=cdata_excelservices_source
);

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

 
 
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