Question

我已经检查过有关此问题的其他问题，但无法解决问题

$this->db->where(array('sender_deletedS' => 1, 'receiver_deleted' => 0 ));
            $this->db->or_where(array('sender_deletedS' => 0, 'receiver_deleted' => 1 ));
            $this->db->or_where(array('sender_deletedS' => 0, 'receiver_deleted' => 0 ));
            $query2 = $this->db->get('message');

它产生

SELECT * FROM `message` WHERE `sender_deletedS` = 1 AND `receiver_deleted` =0 OR `sender_deletedS` =0 OR `receiver_deleted` = 1 OR `sender_deletedS` =0 OR `receiver_deleted` =0

但我想要这个

SELECT * FROM `message` WHERE `sender_deletedS` = 1 AND `receiver_deleted` =0 OR `sender_deletedS` =0 AND `receiver_deleted` = 1 OR `sender_deletedS` =0 AND `receiver_deleted` =0

Answer 1

$sql = "sender_deleted = 1 AND receiver_deleted = 0 OR   sender_deleted = 0 AND receiver_deleted = 1 OR 
sender_deleted = 0 AND receiver_deleted = 0
"; 

$this->db->where($sql);

$this->db->get('message') ;

可以使用变量存储和执行语句，如上例中所示

Answer 2

如果您使用查询生成器或活动记录如此混乱，请尝试传统的SQL方法。它也很容易理解

$this->db->query("SELECT * FROM `message` WHERE `sender_deletedS` = 1 AND `receiver_deleted` =0 OR `sender_deletedS` =0 AND `receiver_deleted` = 1 OR `sender_deletedS` =0 AND `receiver_deleted` =0");

or_where将生成一个OR已加入的声明。如果它合并为AND。

示例01

$this->db->or_where('user_id =', 0);
$this->db->or_where('member_id =',  1);

输出

WHERE user_id = 0 OR member_id = 1

示例02

$this->db->or_where(array('user_id' => 0, 'member_id' => 1 ));

输出

WHERE user_id = 0 AND member_id = 1

示例03

$this->db->or_where(array('user_id' => 0, 'member_id' => 1 ));
$this->db->or_where('library_id =',  0);

输出

WHERE user_id = 0 AND member_id = 1 OR library_id = 0

$this->db->or_where() in codeigniter.com

如何在codeigniter中使用OR子句重写SQL语句

2 个答案: