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  1. or download this
    my $result = defined($dbh);
  2. or download this
    if (!$result) {
  3. or download this
    if (!defined($dbh) ) {
$errStr .= " [dbh UNDEFINED]".$testStr;
$self->log_comment("ERROR: db_connect => ".$errStr);
...
else {
$errStr .= " [dbh DEFINED]".$testStr;
}