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Build a Simple VCL Application for Greenplum Data

How to build a simple VCL Application to view Greenplum data in RAD Studio using the CData FireDAC Components for Greenplum.

Embarcadero RAD Studio provides a development environment for Delphi and C++Builder applications. With the CData FireDAC Components for Greenplum, you gain access to live Greenplum data within RAD Studio, abstracting the data into tables, views, and stored procedures that can be used to both retrieve and update Greenplum data. This article will walk through connecting to Greenplum and creating a simple VCL application with the Form Designer.

Creating a VCL Application for Greenplum Data

The following instructions show how to use the Form Designer to create a simple VCL Forms application that shows the basic FireDAC objects needed to connect to Greenplum from any application.

The following example populates a TDBGrid control.

  1. Create a new VCL Forms Application.
  2. Drop a TFDPhysGreenplumDriverLink and TFDConnection object onto the form.
  3. Double-click the TFDConnection object. The FireDAC Connection Editor is displayed. Select "CData.Greenplum" in the DriverId menu and configure the connection properties.

    Greenplum に接続するには、Server、Port (デフォルトポートは5432)、およびDatabase 接続プロパティを設定して、サーバーへの認証に使用するUser とPassword を設定します。Database プロパティが指定されていない場合、本製品はユーザーのデフォルトデータベース(ユーザーと同じ名前になります)に接続します。

  4. Drop a TFDQuery object onto the form and set the properties below:

    • Connection - Set this property to the TFDConnection object, if this object is not already specified.
    • SQL - Click the button in the SQL property and enter a query.
    • Active - Set this property to true.
  5. Drop a TDataSource object onto the form and set the following property:

    • DataSet - In the menu for this property, select the name of the TFDQuery object.
  6. Drop a TDBGrid control onto the form and set the following property:

    • DataSource - Select the name of the TDataSource.
  7. Drop a TFDGUIxWaitCursor onto the form. This is required to avoid a run-time error.

You now have an executable application that displays the results of the SQL Query set in the TFDQuery object.

 
 
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