CI框架 where 跟 OR 怎麼連用

最近再用CI框架，有時候會懵一下，因爲沒太多時間看手冊，所以用到的自己先總結一下，免得到時候自己還得花時間再看，下面貼代碼:

我先用的是

public function get_cands_where( $where, $begin=null, $size=null, $paixu = 'cand_city', $projs = '')
    {
    	if( isset( $begin ) && isset( $size ) ){
    		$this->db->limit( $size, $begin );
    	}
    	$this->db->where( $where );
        if (!empty($projs)) {
            foreach ($projs as $projkey => $projvalue) {
                $this->db->or_where('proj_id', $projvalue['proj_id']);
            }
        }
        $this->db->order_by( $paixu );
    	$query = $this->db->get( $this->table_name );
    	$result = $query->result_array();
    	return $result;
    }

SELECT COUNT(*) AS count FROM `tbl_cand` WHERE `cand_phone` = 2147483647 AND `cand_email` = '[email protected]'  OR  `proj_id` = '100137' OR `proj_id` = '100147'

但我想要的結果是這樣：

SELECT COUNT(*) AS count FROM `tbl_cand` WHERE `cand_phone` = 2147483647 AND `cand_email` = '[email protected]'  AND  (`proj_id` = '100137' OR `proj_id` = '100147')

so？加兩行就可，很簡單

public function get_cands_where( $where, $begin=null, $size=null, $paixu = 'cand_city', $projs = '')
    {
    	if( isset( $begin ) && isset( $size ) ){
    		$this->db->limit( $size, $begin );
    	}
    	$this->db->where( $where );
        if (!empty($projs)) {
            $this->db->group_start();
            foreach ($projs as $projkey => $projvalue) {
                $this->db->or_where('proj_id', $projvalue['proj_id']);
            }
            $this->db->group_end();
        }
        $this->db->order_by( $paixu );
    	$query = $this->db->get( $this->table_name );
    	$result = $query->result_array();
    	return $result;
    }

$this->db->group_start();

$this->db->group_end();

這倆代表後面的分組開始，也就是左括號，end代表結束，就是右括號

省的自己拼接了，畢竟自己拼的沒人家框架封裝的安全，穩定