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Build a Simple VCL Application for Azure Data Catalog データ
How to build a simple VCL Application to view Azure Data Catalog データ in RAD Studio using the CData ODBC Driver for Azure Data Catalog.
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 Azure Data Catalog, you gain access to live Azure Data Catalog データ within RAD Studio, abstracting the data into tables, views, and stored procedures that can be used to retrieve Azure Data Catalog データ. This article will walk through connecting to Azure Data Catalog and creating a simple VCL application with the Form Designer.
Create a Connection to Azure Data Catalog 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.
Azure Data Catalog 接続プロパティの取得・設定方法
OAuth 認証で接続
Azure Data Catalog の認証にはOAuth を使用します。CData 製品では組込みOAuth が利用できるので、接続プロパティを設定することなく接続を試行するだけで、ブラウザ経由でAAS に認証できます。詳しい設定方法については、ヘルプドキュメントの「Azure Data Catalog への認証」セクションを参照してください。
設定は任意ですが、CatalogName プロパティを設定することでAzure Data Catalog から返されるカタログデータを明示的に指定できます。
CatalogName：Azure Data Catalog に紐づいているカタログ名に設定。空のままにすると、デフォルトのカタログが使用されます。カタログ名は、「Azure Portal」->「データカタログ」->「カタログ名」から取得できます。
You can then follow the steps below to use the Data Explorer to create a FireDAC connection to Azure Data Catalog 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 Azure Data Catalog.
Create VCL Applications with Connectivity to Azure Data Catalog データ
Follow the procedure below to start executing queries to Azure Data Catalog データ from a simple VCL application that displays the results of a query in a grid.
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Drop a TFDConnection component onto the form and set the following properties:
- ConnectionDefName: Select the FireDAC connection to Azure Data Catalog データ.
- Connected: Select True from the menu and, in the dialog that appears, enter your credentials.
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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 DslAddressDatabase, Type FROM Tables WHERE Name = 'FactProductInventory'- 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.
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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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