A basic example for you to adapt/enhance as required

#!perl
use DBI; 
use strict; 
use warnings; 
use Data::Dump 'pp';

my $dbh = get_dbh(); # connect

# use hash to group data
my %logins=();
my $sql = 'SHOW GRANTS';
my $sth = $dbh->prepare($sql);
$sth->execute();
while (my ($result) = $sth->fetchrow_array()) {
  $result =~ s/['`]//g;
  if ($result =~ m/GRANT (.+?) ON (.+?) TO (\S+\@\S+)/i){
    push @{$logins{$3}{$2}},$1;
  }; 
}
pp \%logins;

# build array from hash
my @logins=();
for my $userhost (sort keys %logins){
  for my $db (sort keys %{$logins{$userhost}}){
    # join into one line here
    my $grant = join ',',@{$logins{$userhost}{$db}};
    my ($user,$host) = split '@',$userhost;
    push @logins,[$host,$user,$db,$grant];
  }
}
pp \@logins;

[download]
poj

In reply to Re: Hurdle with summarizing results from complex data structure related to MySQL result handling by poj
in thread Hurdle with summarizing results from complex data structure related to MySQL result handling by hiyall

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