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DataBind Controls to TaxJar データ in C++Builder
DataBind to TaxJar のデータ in C++Builder with standard components and controls.
最終更新日：2023-06-12The CData ODBC Driver for TaxJar makes it easy to integrate connectivity to live TaxJar 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 TaxJar 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 TaxJar 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.
TaxJar API への認証には、まず初めにTaxJar UI からAPI キーを取得する必要があります。
NOTE：API の利用は、Professional およびPremium TaxJar プランでのみ可能です。
すでにProfessional またはPremium プランをお持ちの方は、TaxJar UI にログインして、「アカウント」->「TaxJar API」に移動するとAPI キーを確認することができます。 API キーを取得したら、APIKey 接続プロパティに設定できます。
その他の注意事項
- デフォルトでは、エンティティが日付範囲フィルタをサポートしている場合、CData コネクタは過去3か月のデータを取得します。StartDate を設定して、取得するデータの最小作成日を指定することができます。
- API キーがサンドボックスAPI アカウント用に作成されている場合は、UseSandbox をtrue に設定してください。ただし、すべてのエンドポイントが期待どおりに機能するとは限りません。詳しくは、TaxJar 開発者用ドキュメント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 TaxJar.
- 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 TaxJar.
Create VCL Applications with Connectivity to TaxJar データ
Follow the procedure below to start querying TaxJar のデータ 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 TaxJar.
- 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 TransactionID, UserID FROM Orders WHERE TransactionID = '123'- 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 TaxJar with FireDAC Components
You can use the TFDConnection and TFQuery components to execute queries to TaxJar のデータ. This section provides taxjarspecific examples of executing queries with the TFQuery component.
Connect to TaxJar 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 TaxJar ODBC Source";
FDConnection1->Connected = true;
To connect the TFDQuery component to TaxJar 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 Orders where transactionid = :TransactionID";
FDQuery1->ParamByName("transactionid")->AsString = "123";
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 Orders where transactionid = :TransactionID";
FDQuery1.ParamByName("transactionid")->AsString = "123";
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 Orders 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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