Question

I am using DBD::CSV to show csv data. The code I have is:

#! perl
use strict;
use warnings;
use DBI;

my $dbh = DBI->connect("dbi:CSV:", undef, undef, {
    f_dir            => ".",
    f_ext            => ".txt/r",
    f_lock           => 2,
    csv_eol          => "\n",
    csv_sep_char     => "|",
    csv_quote_char   => '"',
    csv_escape_char  => '"',
    csv_class        => "Text::CSV_XS",
    csv_null         => 1,
    csv_tables       => {
        info => {
            file => "countries.txt"
        }
    },  
    FetchHashKeyName => "NAME_lc",
}) or die $DBI::errstr;

$dbh->{csv_tables}->{countries} = {
  skip_first_row => 0,
  col_names => ["a","b","c","d"],
  raw_header => 1,
};

my $sth = $dbh->prepare ("select * from countries limit 1");
$sth->execute;
while (my @row = $sth->fetchrow_array) {
  print join " ", @row;
  print "\n"
}

The countries.txt file is like this:

ISO_COUNTRY|COUNTRY_NAME|REGION_CODE|REGION_NAME
AF|Afghanistan|A|Asia
AX|"Aland Islands"|E|Europe
AL|Albania|E|Europe

But when I ran this script, it returns

AF Afghanistan A Asia

I wanted it to return:

ISO_COUNTRY COUNTRY_NAME REGION_CODE REGION_NAME

Does any one know how to achieve this using DBD::CSV module?

Another question is why the col_names attribute setting didn’t take effect?
How to make it return the following?

 a b c d

Answer 1

$sth->{NAME}, $sth->{NAME_lc} and $sth->{NAME_uc} return a reference to an array containing the names.

my $sth = $dbh->prepare("select * from countries limit 1");
$sth->execute;
print "$_\n" for @{ $sth->{NAME} };