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Build a Simple VCL Application for Databricks データ
How to build a simple VCL Application to view Databricks データ in RAD Studio using the CData ODBC Driver for Databricks.
最終更新日：2023-06-12Embarcadero RAD Studio provides a development environment for Delphi and C++Builder applications. With the CData ODBC Driver for Databricks, you gain access to live Databricks データ within RAD Studio, abstracting the data into tables, views, and stored procedures that can be used to retrieve and update Databricks データ. This article will walk through connecting to Databricks and creating a simple VCL application with the Form Designer.
Create a Connection to Databricks データ
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.
Databricks 接続プロパティの取得・設定方法
Databricks クラスターに接続するには、以下のプロパティを設定します。
- Database：Databricks データベース名。
- Server：Databricks クラスターのサーバーのホスト名。
- HTTPPath：Databricks クラスターのHTTP パス。
- Token：個人用アクセストークン。この値は、Databricks インスタンスのユーザー設定ページに移動してアクセストークンタブを選択することで取得できます。
Databricks への認証
CData は、次の認証スキームをサポートしています。
- Basic
- 個人用アクセストークン
- Azure Active Directory（AD）
- Azure サービスプリンシパル
- OAuthU2M
- OAuthM2M
Basic
Basic 認証には、ユーザー名とパスワードが必要です。以下を設定します。
- AuthScheme：Basic。
- User：ユーザーネーム。これはデフォルト値（"Token"）をオーバーライドします。
- Token：パスワード。
その他の認証方法については、ヘルプドキュメント の「はじめに」セクションを参照してください。
You can then follow the steps below to use the Data Explorer to create a FireDAC connection to Databricks データ.
- In a new VCL Forms application, expand the FireDAC node in the Data Explorer.
- Right-click the ODBC Data Source node in the Data Explorer.
- Click Add New Connection.
- Enter a name for the connection.
- In the FireDAC Connection Editor that appears, set the DataSource property to the name of the ODBC DSN for Databricks.
Create VCL Applications with Connectivity to Databricks データ
Follow the procedure below to start executing queries to Databricks データ from a simple VCL application that displays the results of a query in a grid.
-
Drop a TFDConnection component onto the form and set the following properties:
- ConnectionDefName: Select the FireDAC connection to Databricks データ.
- Connected: Select True from the menu and, in the dialog that appears, enter your credentials.
-
Drop a TFDQuery component onto the form and set the properties below:
- Connection: Set this property to the TFDConnection component, if this component is not already specified.
SQL: Click the button in the SQL property and enter a query. For example:
SELECT City, CompanyName FROM Customers WHERE Country = 'US'- Active: Set this property to true.
Drop a TDataSource component onto the form and set the following property:
- DataSet: In the menu for this property, select the name of the TFDQuery component.
-
Drop a TDBGrid control onto the form and set the following property:
- DataSource: Select the name of the TDataSource.
- Drop a TFDGUIxWaitCursor onto the form — this is required to avoid a run-time error.
You now have an executable application that displays the results of the SQL Query set in the TFDQuery object.
Related Articles
Below you can find other articles for using the CData ODBC Driver with RAD Studio, Delphi, and C++ Builder.
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