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IBM Cloud Object Storage ODBC Driver
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IBM Cloud Object Storage ODBC Driver を使って、ODBC 接続をサポートするあらゆるアプリケーション・ツールからIBM Cloud Object Storage にデータ連携。
IBM Cloud Object Storage データにデータベースと同感覚でアクセスして、IBM Cloud Object Storage データに使い慣れたODBC インターフェースで連携。
The CData ODBC Driver for IBM Cloud Object Storage makes it easy to integrate connectivity to live IBM Cloud Object Storage 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 IBM Cloud Object Storage 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.
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.
Cloud Object Storage に接続する前に、Cloud Object Storage インスタンスを登録してCloud Object Storage API キーとCRN を取得していきます。
IBM Cloud アカウントにCloud Object Storage がまだない場合は、以下の手順に従ってアカウントにSQL Query のインスタンスをインストールできます。
API キーは以下の手順で取得できます。
デフォルトでは、CData 製品はCloud Object Storage CRN を自動で取得します。ただし、複数のアカウントがある場合は、CloudObjectStorageCRN を明示的に指定する必要があります。この値は、次の2つの方法で取得できます。
これで準備は完了です。以下の接続プロパティを設定してください。
プロパティを設定したら、これで接続設定は完了です。
You can then follow the steps below to use the Data Explorer to create a FireDAC connection to IBM Cloud Object Storage.
Follow the procedure below to start querying IBM Cloud Object Storage 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:
Drop a TFDQuery component onto the form and set the properties below:
SQL: Click the button in the SQL property and enter a query. For example:
SELECT Key, Etag FROM Objects WHERE Bucket = 'someBucket'
Drop a TDataSource component onto the form and set the following property:
Drop a TDBGrid control onto the form and set the following property:
You can use the TFDConnection and TFQuery components to execute queries to IBM Cloud Object Storage のデータ. This section provides IBM Cloud Object Storage-specific examples of executing queries with the TFQuery component.
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 IBM Cloud Object Storage ODBC Source";
FDConnection1->Connected = true;
To connect the TFDQuery component to IBM Cloud Object Storage 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.
To create a parameterized query, use the following syntax below:
FDQuery1->SQL->Text = "select * from Objects where bucket = :Bucket";
FDQuery1->ParamByName("bucket")->AsString = "someBucket";
query->Open();
The example above binds a string-type input parameter by name and then opens the dataset that results.
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.
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 Objects where bucket = :Bucket";
FDQuery1.ParamByName("bucket")->AsString = "someBucket";
FDQuery1->Open();
Below you can find other articles for using the CData ODBC Driver with RAD Studio, Delphi, and C++ Builder.
