pulling a numerical value out of a dropdown box html

Looking for some help on how to pull out a numerical value from a drop down box back into an if statement in a  controller:

Dropdown box:

<div class="form-group"><select class="form-control" name="Role"><option value="">Select your accout type</option><option value="0">optionOne</option><option value="1">otionTwo</option></select></div>

 if (optionOne is chosen)
 {
       set a database field to 2                
 }

 if(optionTwo is chosen)                
 { 
       set a database field to 3
 }

I'm looking at inserting two different integers  into a database depending on which option is selected from the dropdown box.