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my $sql_query = "SELECT * FROM export";

...
    RaiseError => 1,
}
);

my $sth = $dbh->prepare($sql_query);
$sth->execute();

$dbh = DBI->connect ("dbi:CSV:f_dir:/root", undef, undef, {
        f_ext      => ".csv/r",
...

my $sth = $dbh->prepare($sql_query);
$sth->execute();

my $sql_query = "SELECT * FROM export";
my $sth = $dbh->prepare($sql_query);
$sth->execute();

my $sth = $dbh->prepare ("SELECT * from export");
$sth->execute();

$sth->finish();
$dbh->disconnect();

my $dbh = DBI->connect ("dbi:CSV:f_dir:/root", undef, undef, {
    f_ext      => ".csv",
    RaiseError => 1,
}
);