Php 或_where内部where函数活动记录

我想问一下，你们中是否有人知道如何在where-in-codeigniter中放置或_-where

我想创建一个查询，如下所示

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

我创造了这样的东西

$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();

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

但我知道这是不对的，因为这段代码会产生类似的结果

$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();

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

---

我想把or_where放在where子句中，但我不确定这是否正确，也不知道如何做。请告知，谢谢。

您不能根据需要将

where

和

或

组合在一起

或_where

可用于仅需要

或

查询的情况。你可以试试这个解决方案

    $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

---

有没有一种方法可以让它看起来像一个准备好的陈述？例如，“（（in=？和call_in=？）或（out=？和call_out=？）”，数组（0,1,0,1）），我不确定这是否可行