Quick and dirty way: Just use a regexp to add in the 'selected' string if your default value exists. You may want to do some extra error checking too, like making sure that your default value is a valid option.

my $parameter_value = "option2"; # Your default value from the DB
my $parameter_select = qq(
  <select name="parameter">
    <option value="option1">Option 1
    <option value="option2">Option 2
  </select>
); # your select statement string

if ($parameter_value) {
  $parameter_select =~ s/value="$paremeter_value"/value="$paremeter_va
+lue" selected/;
}
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