Question

我有三张桌子

+----------+ +-------------+
| adv      | | removed_adv |
+==========+ +=============+
| id       | | id          |
| group    | | adv_id      |
| category | | member_id   |
| title    | +-------------+
| path     | 
| duration |
+----------+

我想从特定组和类别的adv表中获取数据。但如果removed_adv.advid = adv.id，则结果集不应包含广告。我试过跟随。它返回没有filtering by $this->db->where_not_in('adv.id', 'ids from removed_adv');

的所有记录

$this->db->select('*');
            $this->db->from('adv');
            $this->db->where_not_in('adv.id', 'ids from removed_adv');
            $this->db->where_in(array(
                'category' => $cat_id,
                'group' => $group_id
            ));            
            return $this->db->get();

Answer 1

这是我的SELECT声明：SELECT * FROM adv WHERE id NOT IN (SELECT adv_id FROM removed_adv) AND group IN (group_id1, group_id2,...) AND category IN (category1, category2,...)

所以你应该使用$this->db->last_query()打印你的SQL语句并在SQL查询浏览器/ phpMyAdmin等上运行。

这是我的PHP代码

$query = $this->db->select('adv_id')->get('removed_adv');
$adv_id_array = $query->result_array();

$this->db->select('*');
$this->db->from('adv');
$this->db->where_not_in('adv.id', $adv_id_array);
$this->db->where_in(array(
    'category' => $cat_id,
    'group' => $group_id
));            
return $this->db->get();

codeigniter活动记录不返回预期结果

1 个答案: