สอบถาม CodeIgniter ในการ ใช้ update_batch แบบ Multi conditions ครับ

		$data = array(
			array(
				'concat(x,y)' => '10',
				'dte' => '2018-10-01'
			),
			array(
				'concat(x,y)' => '20' ,
				'dte' => '2018-10-02'
			)
		);

		$this->db->update_batch($this->Hk->dbn.'hack_test', $data, 'concat(x,y)');
		echo $this->db->last_query();

UPDATE "Chaidhanan"."dbo"."hack_test" 
SET "dte" = CASE 
  WHEN concat(x,y) = '10' THEN '2018-10-01' 
  WHEN concat(x,y) = '20' THEN '2018-10-02' 
  ELSE "dte" END 
WHERE concat(x,y) IN('10','20')