my $sth_b = $dbh_b->prepare($sql_b, { RaiseError => 1 });
$sth_b->execute();

##</code><code>##

my $dbh_b = DBI->connect(..., { RaiseError => 1 });
my $sth_b = $dbh_b->prepare($sql_b);
$sth_b->execute();