php - How to get the latest inserted table id in codeigniter? -


i have function in controller, used insert data database mysql.

    public function tambah()  {     $data = array(         'elektronik_nama' => $this->input->post('elektronik_nama'),         'elektronik_kode' => $this->input->post('elektronik_kode'),         'elektronik_merk' => $this->input->post('elektronik_merk'),         'elektronik_lokasi' => $this->input->post('elektronik_lokasi'),         'elektronik_tahun_pengadaan' => $this->input->post('elektronik_tahun_pengadaan'),         'elektronik_sbr_perolehan' => $this->input->post('elektronik_sbr_perolehan'),         'elektronik_kondisi' => $this->input->post('elektronik_kondisi'),         'elektronik_harga' => $this->input->post('elektronik_harga'),     );      $data_tronik = $this->in_elektronik_model->tambah_data($data);      $data_tronik_mebel = array(         'semua_aset_id_aset' => $data_tronik,         'semua_aset_nama' => $this->input->post('elektronik_nama'),         'semua_aset_kode' => $this->input->post('elektronik_kode'),     );      $this->in_semua_aset_model->tambah_data($data_tronik_mebel); }

and have 2 models insert data

    class in_elektronik_model extends ci_model {         function tambah_data($data)        {            $this->db->insert('in_elektronik',$data);        }   }

and

class in_semua_aset_model extends ci_model {      function tambah_data($data)     {         $this->db->insert('in_semua_aset', $data);    } }

i assumed 'semua_aset_id_aset' => $data_tronik,will give primary key in_elektronik_model, result give null in_semua_aset_model. how primary key in_elektronik_model?

is primary key insert id? in case: 

class in_elektronik_model extends ci_model {       function tambah_data($data)     {          $this->db->insert('in_elektronik',$data);          $inserted_id = $this->db->insert_id();          return $inserted_id;     } }

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