php - Retrieve a single row from Codeigniter -

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if need retrieve single row of data database, why can't when want insert id table:

'user_id' => $query->row()->id

is there way without foreach loop if want single piece of data?

the full code is: 

$this->db->where('username', $this->input->post('username'));         $query = $this->db->get('members');          $data = array(             'first' => $this->input->post('first'),             'last' => $this->input->post('last'),             'email' => $this->input->post('email'),             'phone' => $this->input->post('phone'),             'address' => $this->input->post('address'),             'city' => $this->input->post('city'),             'state' => $this->input->post('state'),             'zip' => $this->input->post('zip'),             'comments' => $this->input->post('comments'),             'username' => $this->input->post('username'),             'user_id' => $query->row()->id         );          $this->db->insert('contact', $data);

$query->row()->id correct, yes. given field called 'id' in table, , row exists want. can check $query->num_rows() see how many rows returned.


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