Select Code to Download

my $sql= new SQL::Abstract( array_datatypes => 1 );

my $required = {  a => [1, 3, 5],  b => [2, 4, 6],};

my($stmt, @bind)= $sql->insert( testtable => $required );

stmt:  "INSERT INTO testtable ( a, b) VALUES ( ?, ? )"
@bind: (
...
            6
          ]
        );

my $data = [
  {a => 1, b => 2},
  {a => 3, b => 4},
  {a => 5, b => 6},
];

# %columns will become the hash of arrays
my %columns;
...
  # push the value foreach column
  push @{$columns{$_}}, $row->{$_} foreach keys %columns;
}