how do you use active record to query rowid from oracle?

[eluser]kimo_gusatava[/eluser]
I tried useing

Code:

$this->db->select('rowid, *');
        $this->db->from('EMPLOYEES');
        $this->db->where('EMPLOYEE_ID', $id);

result:

Code:

A Database Error Occurred

Error Number:

SELECT "rowid", * FROM "EMPLOYEES" WHERE "EMPLOYEE_ID" = '100'

also tried

Code:

$this->db->select('ROWIDTOCHAR(rowid), *');
        $this->db->from('EMPLOYEES');
        $this->db->where('EMPLOYEE_ID', $id);

result:

Code:

A Database Error Occurred

Error Number:

SELECT ROWIDTOCHAR(rowid), * FROM "EMPLOYEES" WHERE "EMPLOYEE_ID" = '100'

any help on this?