ThinkPHP 中 where条件 or,and 同时使用

('a'=1 and 'b'=2) or ('c'=3 and 'd'=4) and 'e'=5

$where_1['a'] = 1;
$where_1['b'] = 2;
$where_2['c'] = 3;
$where_2['d'] = 4;
$where_main['_complex'] = array(
    $where_1,
    $where_2,
    '_logic' => 'or'
);
$where_main['e'] = 5;
$this->user->where($where_main)->select();

SELECT * FROM `ecs_order_info` WHERE ( ( `order_status` = 5 AND `shipping_status` = 2 ) OR `order_status` = 6 ) AND `user_id` = 1

上面标红的where查询语句在TP中的拼接如下：

    $order=M('order_info');
    $where['order_status']=5;
    $where['shipping_status']=2;
    $map['_complex'] = $where;
    $map['order_status']=6;
    $map['_logic'] = 'or';  
    $final['_complex'] = $map;
    $final['user_id']=1;

   然后直接查询就可以了： $order->where($final)->select();

   问题来了，怎么检测我们写的sql语句没有错呢？执行下面这条语句就可以了，只会翻译成sql语句，不会执行。

   echo $order->where($final)->fetchSql(true)->select();
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作者：gerberasn 
来源：CSDN 
原文：https://blog.csdn.net/landylxy/article/details/70139841 
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