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Build a Simple VCL Application for Cosmos DB データ
How to build a simple VCL Application to view Cosmos DB データ in RAD Studio using the CData ODBC Driver for Cosmos DB.
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 Cosmos DB, you gain access to live Cosmos DB データ within RAD Studio, abstracting the data into tables, views, and stored procedures that can be used to retrieve and update Cosmos DB データ. This article will walk through connecting to Cosmos DB and creating a simple VCL application with the Form Designer.
Create a Connection to Cosmos DB 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.
CosmosDB 接続プロパティの取得・設定方法
SQL API を使ってCosmos DB アカウントに接続するために必要な接続文字列を取得するには、Azure Portal にログインして「Azure Cosmos DB」を選択し、自分のアカウントを選択します。「Settings」セクションで、「Connection String」をクリックして次の値を設定します。
- AccountEndpoint：この値は、Cosmos DB アカウントの「Keys」ブレードからのCosmos DB アカウントURL に設定してください。
- AccountKey：Azure ポータルで、Cosmos DB サービスに移動してAzure Cosmos DB アカウントを選択します。リソースメニューから、 「Keys」ページに移動します。「PRIMARY KEY」値を見つけ、Token をこの値に設定します。
You can then follow the steps below to use the Data Explorer to create a FireDAC connection to Cosmos DB 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 Cosmos DB.
Create VCL Applications with Connectivity to Cosmos DB データ
Follow the procedure below to start executing queries to Cosmos DB 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 Cosmos DB 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 City, CompanyName FROM Customers- 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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