Oracle Nextval issue

[eluser]Unknown[/eluser]
I’m new to CodeIgniter. I try add this line to file oci8_result.php.

Code:

if(!array_key_exists('NEXTVAL',$this->result_array()[0]))

in function num_rows()

Code:

public function num_rows()
{
  if ($this->num_rows === 0 && count($this->result_array()) > 0)
  {
   $this->num_rows = count($this->result_array());

   if(!array_key_exists('NEXTVAL',$this->result_array()[0]))
   @oci_execute($this->stmt_id);

   if ($this->curs_id)
   {
    @oci_execute($this->curs_id);
   }
  }

  return $this->num_rows;
}

I hope this will help.
I use CI 2.1.3 and this work for me.