As I don't know SQL, my first idea was to deal with the csv as a text file. hmmm.

It seems DBD::CSV doesn't like "ALTER TABLE" so, here is a POC with "CREATE TABLE".

I hope, it is not the wrong way to do it.

#!/usr/bin/env perl

use strict;
use warnings;
use DBI;

my $table    = "t.csv";
my $newtable = "tnew.csv";

my $dbh = DBI->connect ("dbi:CSV:") or
    die "Cannot connect: $DBI::errstr";

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

unlink $newtable;
$dbh->do ("CREATE TABLE $newtable (vm_name char(0), vm_cluster char(0)
+, zone char(0))") or
    die "Cannot prepare: " . $dbh->errstr ();
 
my ($vm_name, $vm_cluster);
$sth->bind_columns (\$vm_name, \$vm_cluster,undef);
while ($sth->fetch) {
    $dbh->do ("INSERT INTO $newtable VALUES (".
       $dbh->quote ($vm_name)             . ",".
       $dbh->quote ($vm_cluster)          . ",".
       $dbh->quote (&whatzone())          . ")"
    );
}
$sth->finish;

#unlink $table;
#rename $newtable,$table;

sub whatzone {
    return "zone".(1+int rand(3));
}

[download]

In reply to Re: DBD::CSV - How to insert a new column with column header in an existing CSV file by brx
in thread DBD::CSV - How to insert a new column with column header in an existing CSV file by slayedbylucifer

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