How can we run a partial reload and reflect user Input, a bit like in an ODAG app?

The script shall look like

replace select A,B,C  from TABLE1 where A=$(vMargin);

The variable vMargin shall be set in the frontend by the user before the partial reload is triggered with the button visualization.

The background is that the select statement would be too slow, if we load all data from the database and anyhow we would have data in the model that is not wanted.