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my $errmsg = '';
my $sql = "INSERT INTO url (url, url_id) VALUES (?, ?)";
...
  warn "INSERT url FAILED: " . $dbh->errstr;
  $errmsg = "There was an error adding the URL";
}

if( $dbh->err ){
  warn "INSERT url FAILED: " . $dbh->errstr;
...
    $errmsg = "There was an error adding the URL";
  }
}

my $tmp_id = $dbh->selectrow_array("select url_id from url where url =
+ ?",{},$url);
if( $ct ){
...
}
...
INSERT INTO ...