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my($field1, $field2, $field3);
$sth->prepare("SELECT Field1, Field2, Field3 ...");
$sth->bind_columns(\($field1, $field2, $field3));
while($sth->fetch) {
    print "$field1\t$field2\t$field3\n";
}

my($field1, $field2, $field3);
$sth->prepare("SELECT Field1, Field2, Field3 ...");
$sth->bind_columns(map { \$$_ } @{ $sth->{NAME_lc} });
while($sth->fetch) {
    print "$field1\t$field2\t$field3\n";
}