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

my $dbh = get_dbh();

my $proc = "
  CREATE FUNCTION my_subrt(s CHAR(30))
    RETURNS CHAR(50)
    RETURN CONCAT(s,'####');
  ";
$dbh->do('DROP FUNCTION IF EXISTS my_subrt'); 
$dbh->do($proc); 
#$dbh->do('DELETE FROM TABLE2'); 
my $sql = '
  INSERT INTO TABLE2 (COLUMN1, COLUMN2, COLUMN3)
  SELECT COLUMN1, COLUMN2, my_subrt(COLUMN3)
  FROM TABLE1 
  WHERE COLUMN4=?';
my $rv  = $dbh->do($sql, {}, 'foo');

my $ar = $dbh->selectall_arrayref('SELECT * FROM TABLE2');
pp $ar;

$dbh->do('DROP FUNCTION my_subrt'); 

sub get_dbh{
  my $database = "test"; my $user = ""; my $pw = "";
  my $dsn = "dbi:mysql:$database:localhost:3306"; 
  my $dbh = DBI->connect($dsn, $user, $pw, { 
         RaiseError=>1, AutoCommit=>1 } );
  return $dbh;
}