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DataBind Controls to SAP Netweaver Gateway データ in C++Builder
DataBind to SAP Netweaver Gateway のデータ in C++Builder with standard components and controls.
最終更新日：2023-06-12The CData ODBC Driver for SAP Netweaver Gateway makes it easy to integrate connectivity to live SAP Netweaver Gateway 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 SAP Netweaver Gateway 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 SAP Netweaver Gateway 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.
SAP Gateway 接続プロパティの取得・設定方法
SAP Gateway のテーブルにアクセスするには、次の接続プロパティを設定します。
- URL = お使いの環境のURL、またはサービスの完全URL。例えば、完全URL は次のようになります：https://sapes5.sapdevcenter.com/sap/opu/odata/IWBEP/GWSAMPLE_BASIC/。この例では、環境URL は次のようになります：https://sapes5.sapdevcenter.com。CustomUrlParams プロパティを使用して、追加プロパティを追加します。
- Namespace = 適切なService Namespace。先ほどの例では、IWBEP が名前空間です。サービスへの完全URL が指定されている場合は任意です。
- Service = データを取得するサービス。先ほどの例では、サービスはGWSAMPLE_BASIC です。完全URL が指定されている場合は必須ではありません。
- CustomUrlParams = HTTP リクエストに含まれる必要のある追加プロパティ；例えばsap-client=001&sap-language=EN。
SAP Gateway への認証
SAP Gateway はBasic 認証、OAuth 2.0 認証、SAP BTP Destination 認証を許可します。
Basic 認証
Basic 認証を有効にするには、以下のプロパティを設定します。
- AuthScheme = Basic。
- User = SAP Gateway へのログインに使用するユーザー名。
- Password = SAP Gateway へのログインに使用するパスワード。
上記のプロパティを設定したら、接続の準備は完了です。ローカルデータにアクセスするには、個人の認証情報を使用します。
他の認証方法については、ヘルプドキュメントの「接続の確立」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 SAP Netweaver Gateway.
- 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 SAP Netweaver Gateway.
Create VCL Applications with Connectivity to SAP Netweaver Gateway データ
Follow the procedure below to start querying SAP Netweaver Gateway 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 SAP Netweaver Gateway.
- 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 ProductID, Quantity FROM SalesOrderLineItems WHERE Quantity < 15- 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 SAP Netweaver Gateway with FireDAC Components
You can use the TFDConnection and TFQuery components to execute queries to SAP Netweaver Gateway のデータ. This section provides sapgatewayspecific examples of executing queries with the TFQuery component.
Connect to SAP Netweaver Gateway 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 SAP Netweaver Gateway ODBC Source";
FDConnection1->Connected = true;
To connect the TFDQuery component to SAP Netweaver Gateway 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 SalesOrderLineItems where quantity = :Quantity";
FDQuery1->ParamByName("quantity")->AsString = "15";
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 SalesOrderLineItems where quantity = :Quantity";
FDQuery1.ParamByName("quantity")->AsString = "15";
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 SalesOrderLineItems 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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