or_where裏面功能活躍的記錄

Question

我想問問你們中的任何人是否知道如何將or_where放在codeigniter中的某處？

我想創建一個查詢，如下圖所示

select * 
from table 
where 
(
    (in = 0 and call_in = 1) or 
    (out = 0 and call_out = 1) 
) and 
mid = 0 
ORDER BY id DESC 
limit 1 

我創建了這樣的事情

$result = $mysql_handler->select('*') 
         ->from("table") 
         ->where(
           array(
           "in"  => 0, 
           "call_in" => 1 
           ) 
         ) 
         ->or_where(
           array(
           "out"  => 0, 
           "call_out" => 1 
          ) 
         ) 
         ->where("mid", 0) 
         ->order_by("id", "DESC") 
         ->limit(1) 
         ->get(); 

但我知道這是不對的，因爲這些代碼會產生這樣的

select * 
from table 
where 
    (in = 0 and call_in = 1) or 
    (out = 0 and call_out = 1) and 
    mid = 0 
ORDER BY id DESC 
limit 1 

我想將or_where放在where子句中，但我不確定if這是正確的或如何做到這一點。請建議謝謝。

Answer 1

根據需要不能合併where和or_where。 or_where可用於只有OR查詢需要。你可以試試這個爲您的解決方案

$this->db->from('table'); 
    $this->db->select('*'); 
    $this->db->where('((in = 0 and call_in = 1) OR (out = 0 and call_out = 1))'); 
    $this->db->where("mid", 0); 
    $this->db->order_by("id", "DESC"); 
    $this->db->limit(1); 
    $result=$this->db->get(); 

或者

$result = $mysql_handler->select('*') 
     ->from("table") 
     ->where('((in = 0 and call_in = 1) OR (out = 0 and call_out = 1))')    
     ->where("mid", 0) 
     ->order_by("id", "DESC") 
     ->limit(1) 
     ->get();