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Build a Simple VCL Application for PostgreSQL Data

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

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

Creating a VCL Application for PostgreSQL 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 PostgreSQL from any application.

The following example populates a TDBGrid control.

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

    To connect to PostgreSQL, set the Server, Port (the default port is 5432), and Database connection properties and set the User and Password you wish to use to authenticate to the server. If the Database property is not specified, the data provider connects to the user's default database.

  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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