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

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

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

Google Search 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 Google Search Sys is created automatically).

Google カスタム検索エンジンを使って検索するには、CustomSearchId およびAPIKey 接続プロパティが必要です。

CustomSearchId を取得するには、Google カスタム検索エンジンにサインインして検索エンジンを新規作成します。

APIKey を取得するには、Google API Console でカスタム検索API を有効にします。

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

Google Search Results 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 Google Search results.

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

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

Create an External Data Source for Google Search

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

For Google Search, 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_googlesearch_source
WITH ( 
  LOCATION = 'odbc://SERVERNAME[:PORT]',
  CONNECTION_OPTIONS = 'DSN=CData Google Search Sys',
  -- PUSHDOWN = ON | OFF,
  CREDENTIAL = googlesearch_creds
);

Google Search のExternal Table を作成

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

CREATE EXTERNAL TABLE VideoSearch(
  Title [nvarchar](255) NULL,
  ViewCount [nvarchar](255) NULL,
  ...
) WITH ( 
  LOCATION='VideoSearch',
  DATA_SOURCE=cdata_googlesearch_source
);

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

 
 
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