my $user_id = 12;

my $user = get_hash("SELECT * FROM users WHERE user_id = ?", $user_id);

sub get_hash{
  my ($statement, @param) = @_;  
 
  my $sth = $dbh->prepare($statement);
  $sth->execute(@param) or die failLog( $dbh->errstr );
  if(my $zeile = $sth->fetchrow_hashref()){
    $sth->finish; 
    return $zeile;
  } 
  return 0; 
}