A Database Example 

• Now that we have exception handling in place

my $attr = { AutoCommit => 0, RaiseError => 1, PrintError => 0 };
my $dsn  = 'dbi:Pg:dbname=products';

sub get_categories_by_mgr {
    my($prod_mgr_id) = @_;

    my $dbh = DBI->connect($dsn, $user, $pswd, $attr);
    my $sql = 'SELECT * FROM prod_category WHERE prod_mgr_id = ?';
    my $result = $dbh->selectall_arrayref($sql, {}, $prod_mgr_id);
    $dbh->disconnect;
    return $result;
}