Impact of writing select statement in View controller in WD4A

Hi Experts,

I am in a support project of WD. A WD component is there where select query has been written in the view controller  methods.

I know the correct approach is to write select query within the methods of Component controller and call  from the onaction event handler through wd_comp_controller-> method( ) .

But the said has not been done. Now application is running fine .So I want to ask what kind of impact will be there ??

More over if you know in advance  that a  particular attributes or  select statement having less records is going to use only once and no where in other place than can we write in view controller .

Any approach is there where i can do analysis of the said impact.

Thanks in advance

DK