or_where 里面 where 函数活动记录

Question

我想问一下你们中是否有人知道如何在 codeigniter 中的 where 中放置 or_where？

我想创建如下所示的查询

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();

但我知道这是不对的，因为这段代码会产生这样的结果

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

我想将 or_where 放在 where 子句中，但我不确定这是否正确或如何做。请指教谢谢。

Answer 1

您不能随意组合where 和or_where。 or_where 可用于仅需要 OR 查询的地方。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();