#!/usr/bin/perl
use strict;
use warnings;
use DBI;

# Declare variables
my $db = 'C:/Perlen/csv';
my $prefix = '+49';

# Makes a Datebase Handler
my $dbh = DBI->connect("DBI:CSV:f_dir=$db")  or die DBI::errstr;
$dbh->{csv_tables}->{phonebook} = { file => 'test.csv' };

my $sql = qq|
SELECT * FROM phonebook
|;

my $sth = $dbh->prepare( $sql ) or die $dbh->errstr;
$sth->execute() or die $dbh->errstr;
while (my @row = $sth->fetchrow_array()) {
  print join "\t", @row;
  print "\n";
}

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

exit;

ID, Nummer, Vorname, Nachname
1,"0000000000000","Christine","Nachname"
2,"+49000000000000","PS","Bernhardt"
3,"+496985725","Irgendwer","Nachname"