Inserting an array into MongoDB

I have a table in MySQL called new_ndnc that contains five fields. Each field contains 10 million rows.

I have read each field into an array, and now I want to insert the whole array into a field in MongoDB.

My code is below.

#!/usr/bin/perl

use MongoDB;
use MongoDB::OID;
use DBI;

$dbs  = 'amrit';
$user = 'root';
$pass = 'walkover';
$dbh  = DBI->connect("DBI:mysql:database=$dbs", $user, $pass)
    or die "Cannot connect to MySQL server\n";

$conn = MongoDB::Connection->new(
  host    => 'localhost',
  port    => 27017,
  db_name => 'amrit'
);
$db     = $conn->get_database('amrit');
$users  = $db->get_collection('hell2');

$abcuid = $dbh->prepare('select Service_Area_Code from new_ndnc');
$abcuid->execute;

@uid;
while (my @row = $abcuid->fetchrow_array()) {
  push(@uid, @row);
}
$hh = $dbh->prepare('select phonenumbers from new_ndnc');
$hh->execute;

@route1;
while (my @row = $hh->fetchrow_array()) {
  push(@route1, @row);
}

$r4 = $dbh->prepare('select Preferences from new_ndnc');
$r4->execute;

@route4;
while (my @row = $r4->fetchrow_array()) {
  push(@route4, @row);
}
$exr4 = $dbh->prepare('select Opstype from new_ndnc');
$exr4->execute;

@exroute4;
while (my @row = $exr4->fetchrow_array()) {
  push(@exroute4, @row);
}
$r5 = $dbh->prepare('select PhoneType from new_ndnc');
$r5->execute;

@route5;
while (my @row = $r5->fetchrow_array()) {
  push(@route5, @row);
}

$users->insert({
    'UserID'           => "[@uid]",
    'route1'           => "[@route1]",
    'route4'           => "[@route4]",
    'route4_extra_bal' => "[@exroute4]",
    'route5'           => "[@route5]"
  }
);