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DataBind Controls to Cvent データ in C++Builder
DataBind to Cvent のデータ in C++Builder with standard components and controls.
最終更新日：2023-06-12The CData ODBC Driver for Cvent makes it easy to integrate connectivity to live Cvent のデータ with standard data access components in C++Builder. This article shows how to create a simple visual component library (VCL) application in C++Builder that connects to Cvent のデータ, executes queries, and displays the results in a grid. An additional section shows how to use FireDAC components to execute commands from code.
Create a Connection to Cvent 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.
Cvent への認証を行う前に、ワークスペースとOAuth アプリケーションを作成する必要があります。
ワークスペースの作成
ワークスペースを作成するには：
- Cvent にサインインし、App Switcher（ページ右上の青いボタン） -> Admin に移動します。
- Admin メニューから、Integrations -> REST API に移動します。
- Developer Management の新しいタブが立ち上がります。新しいタブでManage API Access をクリックします。
- Workspace を作成し、名前を付けます。開発者にアクセスさせたいスコープを選択します。スコープは、開発者がアクセスできるデータドメインを制御します。
- All を選択すると、開発者は任意のスコープ、およびREST API にこれから追加されるスコープを選択できます。
- Custom を選択すると、開発者がOAuth アプリで選択できるスコープを、選択したスコープに制限できます。本製品によって公開されるすべてのテーブルにアクセスするには、次のスコープを設定する必要があります。
event/attendees:read event/attendees:write event/contacts:read event/contacts:write event/custom-fields:read event/custom-fields:write event/events:read event/events:write event/sessions:delete event/sessions:read event/sessions:write event/speakers:delete event/speakers:read event/speakers:write budget/budget-items:read budget/budget-items:write exhibitor/exhibitors:read exhibitor/exhibitors:write survey/surveys:read survey/surveys:write
OAuth アプリケーションの作成
Workspace を設定して招待すると、開発者はサインアップしてカスタムOAuth アプリを作成できます。手順については、ヘルプドキュメントのカスタムOAuth アプリケーションの作成を参照してください。
Cvent への接続
OAuth アプリケーションを作成したら、次の接続プロパティを設定してCvent に接続します。
- InitiateOAuth：GETANDREFRESH。OAuthAccessToken を自動的に取得およびリフレッシュするために使用します。
- OAuthClientId：OAuth アプリケーションに関連付けられたClient ID。これは、Cvent Developer Portal のApplications page ページにあります。
- OAuthClientSecret：OAuth アプリケーションに関連付けられたClient secret。これは、Cvent Developer Portal のApplications page ページにあります。
You can then follow the steps below to use the Data Explorer to create a FireDAC connection to Cvent.
- 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 Cvent.
Create VCL Applications with Connectivity to Cvent データ
Follow the procedure below to start querying Cvent のデータ 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 Cvent.
- 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 Id, Title FROM Events WHERE Virtual = 'true'- 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.
Execute Commands to Cvent with FireDAC Components
You can use the TFDConnection and TFQuery components to execute queries to Cvent のデータ. This section provides cventspecific examples of executing queries with the TFQuery component.
Connect to Cvent データ
To connect to the data source, set the Connected property of the TFDConnection component to true. You can set the same properties from code:
FDConnection1->ConnectionDefName = "CData Cvent ODBC Source";
FDConnection1->Connected = true;
To connect the TFDQuery component to Cvent のデータ, set the Connection property of the component. When a TFDQuery component is added at design time, its Connection property is automatically set to point to a TFDConnection on the form, as in the application above.
Create Parameterized Queries
To create a parameterized query, use the following syntax below:
FDQuery1->SQL->Text = "select * from Events where virtual = :Virtual";
FDQuery1->ParamByName("virtual")->AsString = "true";
query->Open();
The example above binds a string-type input parameter by name and then opens the dataset that results.
Prepare the Statement
Preparing statements is costly in system resources and time. The connection must be active and open while a statement is prepared. By default, FireDAC prepares the query to avoid recompiling the same query over and over. To disable statement preparation, set ResourceOptions.DirectExecute to True; for example, when you need to execute a query only once.
Execute a Query
To execute a query that returns a result set, such as a select query, use the Open method. The Open method executes the query, returns the result set, and opens it. The Open method will return an error if the query does not produce a result set.
FDQuery1->SQL->Text := "select * from Events where virtual = :Virtual";
FDQuery1.ParamByName("virtual")->AsString = "true";
FDQuery1->Open();
To execute a query that does not return a result set, use the ExecSQL method. The ExecSQL method will return an error if the query returns a result set. To retrieve the count of affected rows use the TFD.RowsAffected property.
FDQ.SQL.Text := "delete from Events where Id = :Id";
FDQuery1->Params->Items[0]->AsString = "x12345";
FDQuery1->ExecSQL();
AnsiString i = FDQuery1->RowsAffected;
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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