Hi,

"What I am trying to get back is an array of hash references, that's al, to my multiple row query"

You may just have a dereferencing problem, but anyway I think you are reaching for Slice with an empty value?

use strict;
use warnings;
use feature 'say';
use DBD::SQLite;
use Data::Dumper;

# set up and populate an in-memory DB

my $dbh = DBI->connect("dbi:SQLite:dbname=:memory:",
    undef,undef,{ RaiseError => 1 });

$dbh->do(q{
    create table data(
    id integer primary key,
    last_name text,
    first_name text,
    role text)
});

my $insert_sth = $dbh->prepare(q{
    insert into data values (?,?,?,?);
});

while ( my $record = <DATA> ) {
    chomp($record);
    my @values = split(' ', $record);

    $insert_sth->execute(@values);
}

# Select everything (!)

my $ref = $dbh->selectall_arrayref(q{
    select * from data
}, { Slice => {} });

say Dumper $ref;

__END__
1 Flintstone Fred Father
2 Flintstone Wilma Mother
3 Flinstone Pebbles Child
4 Flintstone Dino Pet
5 Rubble Barney Father
6 Rubble Betty Mother
7 Rubble Bam-Bam Child
[download]

Output:

$VAR1 = [
          {
            'first_name' => 'Fred',
            'last_name' => 'Flintstone',
            'role' => 'Father',
            'id' => 1
          },
          {
            'first_name' => 'Wilma',
            'last_name' => 'Flintstone',
            'id' => 2,
            'role' => 'Mother'
          },
          {
            'id' => 3,
            'role' => 'Child',
            'last_name' => 'Flinstone',
            'first_name' => 'Pebbles'
          },
          {
            'first_name' => 'Dino',
            'last_name' => 'Flintstone',
            'role' => 'Pet',
            'id' => 4
          },
          {
            'last_name' => 'Rubble',
            'role' => 'Father',
            'id' => 5,
            'first_name' => 'Barney'
          },
          {
            'first_name' => 'Betty',
            'last_name' => 'Rubble',
            'id' => 6,
            'role' => 'Mother'
          },
          {
            'role' => 'Child',
            'id' => 7,
            'last_name' => 'Rubble',
            'first_name' => 'Bam-Bam'
          }
        ];
[download]

To print how your post has it:

for my $row ( @$ref ) {
    for my $colname ( keys %$row ) {
        say $colname;
        say $row->{ $colname };
    }
}
[download]

Hope this helps!