Query layer based on fetures

[Anakreon Mentis]

Hello all.

I need to make a query on a layer based on features.
The data of the layer are retrived from a mysql database
using the OGR driver.

I want to use some of the fields of the table for quering.
The role of the template for the layer seems clear to me.

Is there an example which queries a layer based on features?

Thanks in advanced for your reply.

Anakreon