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DataBind Controls to SQL Analysis Services データ in C++Builder
DataBind to SQL Analysis Services のデータ in C++Builder with standard components and controls.
最終更新日：2023-06-12The CData ODBC Driver for SQL Analysis Services makes it easy to integrate connectivity to live SQL Analysis Services 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 SQL Analysis Services 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 SQL Analysis Services 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.
接続するには、Url プロパティを有効なSQL Server Analysis Services エンドポイントに設定して認証を提供します。XMLA アクセスを使用して、HTTP 経由でホストされているSQL Server Analysis Services インスタンスに接続できます。 Microsoft ドキュメント configure HTTP access を参照してSQL Server Analysis Services に接続してください。
SQL をSQL Server Analysis Services に実行するには、ヘルプドキュメントの「Analysis Services データの取得」を参照してください。接続ごとにメタデータを取得する代わりに、CacheLocation を設定できます。
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HTTP 認証
AuthScheme を"Basic" または"Digest" に設定してUser とPassword を設定します。CustomHeaders に他の認証値を指定します。
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Windows (NTLM)
Windows のUser とPassword を設定して、AuthScheme をNTLM に設定します。
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Kerberos およびKerberos Delegation
Kerberos を認証するには、AuthScheme をNEGOTIATE に設定します。Kerberos 委任を使うには、AuthScheme をKERBEROSDELEGATION に設定します。必要があれば、User、Password およびKerberosSPN を設定します。デフォルトでは、CData 製品は指定されたUrl でSPN と通信しようと試みます。
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SSL/TLS:
デフォルトでは、CData 製品はサーバーの証明書をシステムの信頼できる証明書ストアと照合してSSL/TLS のネゴシエーションを試みます。別の証明書を指定するには、利用可能なフォーマットについてヘルプドキュメントの「SSLServerCert」プロパティを参照してください。
接続を設定したら、その後はあらゆるキューブを二次元テーブルとして扱うことができます。データに接続する際にCData 製品がSSAS のメタデータを取得して、動的にテーブルスキーマを更新します。 「CacheLocation」プロパティを設定すれば自動でファイルにキャッシュを作成するので、接続時に毎回メタデータを取得する必要もなくなります。
詳細は、ヘルプドキュメントの「Retrieving Analysis Services Data」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 SQL Analysis Services.
- 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 SQL Analysis Services.
Create VCL Applications with Connectivity to SQL Analysis Services データ
Follow the procedure below to start querying SQL Analysis Services 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 SQL Analysis Services.
- Connected: Select True from the menu and, in the dialog that appears, enter your credentials.
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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 Fiscal_Year, Sales_Amount FROM Adventure_Works- 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.
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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 SQL Analysis Services with FireDAC Components
You can use the TFDConnection and TFQuery components to execute queries to SQL Analysis Services のデータ. This section provides ssasspecific examples of executing queries with the TFQuery component.
Connect to SQL Analysis Services 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 SQL Analysis Services ODBC Source";
FDConnection1->Connected = true;
To connect the TFDQuery component to SQL Analysis Services 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 Adventure_Works where fiscal_year = :Fiscal_Year";
FDQuery1->ParamByName("fiscal_year")->AsString = "FY 2008";
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 Adventure_Works where fiscal_year = :Fiscal_Year";
FDQuery1.ParamByName("fiscal_year")->AsString = "FY 2008";
FDQuery1->Open();
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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