Ready to get started?

Learn more about the CData ODBC Driver for Btrieve or download a free trial:

Download Now

PolyBase で外部データソースとしてBtrieve を連携利用

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

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

Btrieve 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 Btrieve Sys is created automatically).

The PSQL v13 client will need to be installed on the same machine as the driver. To connect, set the User, Password, Server, and Database properties.

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

Btrieve 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 Btrieve data.

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

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

Create an External Data Source for Btrieve

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

PUSHDOWN is set to ON by default, meaning the ODBC Driver can leverage server-side processing for complex queries.

CREATE EXTERNAL DATA SOURCE cdata_btrieve_source
WITH ( 
  LOCATION = 'odbc://SERVERNAME[:PORT]',
  CONNECTION_OPTIONS = 'DSN=CData Btrieve Sys',
  -- PUSHDOWN = ON | OFF,
  CREDENTIAL = btrieve_creds
);

Btrieve のExternal Table を作成

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

CREATE EXTERNAL TABLE Billing(
  Student_ID [nvarchar](255) NULL,
  Transaction_Number [nvarchar](255) NULL,
  ...
) WITH ( 
  LOCATION='Billing',
  DATA_SOURCE=cdata_btrieve_source
);

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

 
 
ダウンロード