NextAge's Query by Example class provide a method of allow end users to filter their data using a simple QBE interface. It allows the them to save thier queries for later reuse as well.

A QBE are three basic modes of QBE HFitler, SQL, and Advanced SQL. Hfilter and SQL work very similarly except one is accomplishing the task via Hfilter, and one uses an SQL statement with HExecuteSQLQuery. The one advantage to the SQL method is the Multiple File Fields will be expose to the QBE interface.

The Advanced SQL method allows complete control of the SQL statement. This requires a table that is set to be filled by programming. With the Advanced SQL mode the data can be fully loaded on initialization or using a Timer function so that the user is able to interact with the browse while records are still loading.

The QBE class was original inspired and some of the base code comes from the training material provided by Glenn Rathke of Software Design Consulting. We highly recommend his training materials to anyone using the WX suite of tools. http://www.sdcdev.net/

More information and the latest version can always be found at http://www.thenextage.com/wordpress/