I'm writing an insert_row function using DBI. I get the following error:
DBD::DB2::st execute failed: IBMCLI Driver...blah.......The statement string of the PREPARE or EXECUTE IMMEDIATE statement is blank or empty. SQLSTATE=42617. Can't call method execute on an undefined value.

I think it is a problem with my binding parameters. Here is the code:

sub insert_row{
  if( $#_ < 2 ){
    print 'USAGE: $rv = insert_row($DB_TYPE, $DB_HANDLE, $TABLE, $COL1
+, $COL2, $VAL2, $VAL2)';
    return 0;
  }
  my $db_type = shift;
  my $dbh = shift;
  my $table = shift;
  if( ($#_+1) % 2 != 0 ){
    print "COLUMN/VALUE mismatch @ insert_row($db_type,$dbh,$table...)
+";
    return 0;
  }
  my $num_cols = ($#_+1)/2;
  my $val_index = ($#_+1)/2;
  my $col_index = 0;
  my %columns = ();
  my $x = 0;
  for($x = 0, $x < $num_cols, $x++){
    $columns{$_[$col_index]} = $_[$val_index];
    $col_index++;
    $val_index++;
  }
  my $sql = "INSERT INTO " . $table . " (";
  while ( my ($key, $value) = each(%columns) ) {
        $sql .= "$key,";
  }
  chop $sql;
  $sql .=") VALUES (";
  for( $x = 0; $x < $num_cols; $x ++ ){
    $sql .= '?,';
  }
  chop $sql;
  $sql .= ')';
  my $sth = $dbh->prepare($sql);
  my @bind_values = ();
  while ( my ($key, $value) = each(%columns) ) {
        push @bind_values, $value;
  }
  return $sth->execute(@bind_values);
}

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