Maybe you can check on how many records you get returned. The CPAN pages mentions the next function:

my $affected_rows = $mysql->get_affected_rows_length;
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I'm guessing that the has_selected_record returns always true because it can be run and will always return a value. I've never used this module but you could check and see what you get as return value. If this is a number you could change your check a bit perhaps to:

if ( $mysql->has_selected_record > 1 ) {
   #do something;
} else {
   #do something else
}
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Just my 2 cents,

Grtz,

Critter