DataBind Controls to HPCC Systems Data in C++Builder

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HPCC ODBC Driver

The HPCC ODBC Driver is a powerful tool that allows you to connect with live HPCC Systems data, directly from any applications that support ODBC connectivity.

Access HPCC Systems like you would a database - query data through a standard ODBC Driver interface.



DataBind to HPCC Systems data in C++Builder with standard components and controls.

The CData ODBC Driver for HPCC Systems makes it easy to integrate connectivity to live HPCC Systems data 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 HPCC Systems data, 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 FireDAC Connection to HPCC Systems Data

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.

To connect, set the following connection properties: Set URL to the machine name or IP address of the server and the port the server is running on, for example, https://server:port. The User and Password are required to authenticate to the HPCC Systems cluster specified in the URL. Note that LDAP authentication is not currently supported by our ODBC driver.

Set Version to the WsSQL Web server version. Note that if you have not already done so, you will need to install the WsSQL service on the HPCC Systems server. The WsSQL Web service is used to interact with the underlying HPCC Systems platform.

Set Cluster to the target cluster.

You can then follow the steps below to use the Data Explorer to create a FireDAC connection to HPCC Systems.

  1. In a new VCL Forms application, expand the FireDAC node in the Data Explorer.
  2. Right-click the ODBC Data Source node in the Data Explorer.
  3. Click Add New Connection.
  4. Enter a name for the connection.
  5. In the FireDAC Connection Editor that appears, set the DataSource property to the name of the ODBC DSN for HPCC Systems.

Create VCL Applications with Connectivity to HPCC Systems Data

Follow the procedure below to start querying HPCC Systems data from a simple VCL application that displays the results of a query in a grid.

  1. Drop a TFDConnection component onto the form and set the following properties:

    • ConnectionDefName: Select the FireDAC connection to HPCC Systems.
    • Connected: Select True from the menu and, in the dialog that appears, enter your credentials.
  2. 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 SUM(hpcc::test::orders.Price), hpcc::test::customers.CustomerName FROM hpcc::test::orders INNER JOIN hpcc::test::customers ON hpcc::test::orders.CustomerId=hpcc::test::customers.CustomerId;GROUP BY hpcc::test::customers.CustomerName
    • Active: Set this property to true.
  3. 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.
  4. Drop a TDBGrid control onto the form and set the following property:

    • DataSource: Select the name of the TDataSource.
  5. Drop a TFDGUIxWaitCursor onto the form — this is required to avoid a run-time error.

Execute Commands to HPCC Systems with FireDAC Components

You can use the TFDConnection and TFQuery components to execute queries to HPCC Systems data. This section provides HPCC Systems-specific examples of executing queries with the TFQuery component.

Connect to HPCC Systems Data

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 HPCC Systems ODBC Source"; FDConnection1->Connected = true;

To connect the TFDQuery component to HPCC Systems data, 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 hpcc::test::orders where shipcity = :ShipCity"; FDQuery1->ParamByName("shipcity")->AsString = "New York"; 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 hpcc::test::orders where shipcity = :ShipCity"; FDQuery1.ParamByName("shipcity")->AsString = "New York"; FDQuery1->Open();