Build a Simple VCL Application for Avro Data

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

Create a Connection to Avro 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.

Connect to your local Avro file(s) by setting the URI connection property to the location of the Avro file.

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

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 Avro.

👁 A FireDAC connection to the ODBC data source. (Salesforce is shown.)

Create VCL Applications with Connectivity to Avro Data

Follow the procedure below to start executing queries to Avro 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 Avro data.
   • 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 Id, Column1 FROM SampleTable_1 WHERE Column2 = 'value_2'
     

   • 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.

👁 Components in FireDAC used to databind an editable grid to the data source. (Salesforce is shown.)

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

👁 The Data Displayed in a Form. (Salesforce is shown.)

Related Articles

Below you can find other articles for using the CData ODBC Driver with RAD Studio, Delphi, and C++ Builder.

• DataBind Controls to Avro Data in C++Builder
• DataBind Controls to Avro Data in Delphi
• Viewing Avro Data in RAD Studio Data Explorer