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DataBind Controls to Zoho Creator データ in C++Builder
DataBind to Zoho Creator のデータ in C++Builder with standard components and controls.
最終更新日：2023-06-12The CData ODBC Driver for Zoho Creator makes it easy to integrate connectivity to live Zoho Creator 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 Zoho Creator 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 Zoho Creator 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.
Zoho Creator 接続プロパティの取得・設定方法
Zoho Creator に接続するには、Region をサーバーURL のトップレベルドメイン（TLD）に設定します。
Zoho Creator への認証
Zoho Creator は、データに接続する2つの方法を提供します。
- デスクトップ経由で自分のローカルデータに接続する場合（非ブラウザ接続）は、CData が提供する組み込みOAuth アプリケーションを使用します。
- ネットワーク経由で共有データに接続する場合（ブラウザ接続）は、カスタムOAuth アプリケーションを使用します。
- デスクトップ：ユーザーのローカルマシン上でのサーバーへの接続で、テストやプロトタイピングによく使用されます。埋め込みOAuth またはカスタムOAuth で認証されます。
- Web：共有ウェブサイト経由でデータにアクセスします。カスタムOAuth でのみ認証されます。
- ヘッドレスサーバー：他のコンピュータやそのユーザーにサービスを提供する専用コンピュータで、モニタやキーボードなしで動作するように構成されています。埋め込みOAuth またはカスタムOAuth で認証されます。
You can then follow the steps below to use the Data Explorer to create a FireDAC connection to Zoho Creator.
- 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 Zoho Creator.
Create VCL Applications with Connectivity to Zoho Creator データ
Follow the procedure below to start querying Zoho Creator 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 Zoho Creator.
- 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, Leave_Type FROM Leave_Types WHERE Leave_Type = 'Sick'- 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 Zoho Creator with FireDAC Components
You can use the TFDConnection and TFQuery components to execute queries to Zoho Creator のデータ. This section provides zohocreatorspecific examples of executing queries with the TFQuery component.
Connect to Zoho Creator 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 Zoho Creator ODBC Source";
FDConnection1->Connected = true;
To connect the TFDQuery component to Zoho Creator 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 Leave_Types where leave_type = :Leave_Type";
FDQuery1->ParamByName("leave_type")->AsString = "Sick";
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 Leave_Types where leave_type = :Leave_Type";
FDQuery1.ParamByName("leave_type")->AsString = "Sick";
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 Leave_Types 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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