php本机查询到codeigniter查询

嗨，我对此感到困惑。我能在多大程度上将此查询转换为CodeIgniter模型查询？下面是我的php本机查询

$query = "SELECT
              seminars.id,
              seminars.thumb,
              seminars_category.category,
              seminars_category.url,
              seminars_category.date,
              seminars_category.abvr
              FROM
              seminars
              INNER JOIN seminars_category ON seminars_category.id = seminars.category
              WHERE seminars.id = 1 OR seminars.id = 7 OR seminars.id = 12 OR seminars.id = 20
              OR seminars.id = 24 OR seminars.id = 29 OR seminars.id= 77 OR seminars.id = 84 OR seminars.id = 103 
              OR seminars.id = 157 OR seminars.id = 187 OR seminars.id = 234 OR seminars.id =  241 OR seminars.id = 308 OR seminars.id = 314 OR seminars.id = 390
              OR seminars.id = 407 OR seminars.id = 414 OR seminars.id = 429 OR seminars.id = 455 OR seminars.id = 462 OR seminars.id = 511 OR seminars.id = 537 OR seminars.id = 573
              OR seminars.id = 591 OR seminars.id = 641
              ORDER BY seminars_category.date DESC
              "
              ;
    $res = mysql_query($query);  

我想把这个放进去

public function getAllActivities(){
 
}

我的控制器在这里

 $this->data['activities'] = $this->am->getAllActivities();

有人能帮我从php原生查询到CodeIgniter吗

谢谢

$this->db->select('seminars.id, 
            seminars.thumb, 
            seminars_category.category,
            seminars_category.url,
            seminars_category.date,
            seminars_category.abvr');
        $this->db->join('seminars_category', 'seminars_category.id = seminars.category', 'inner');
        //use a loop here for better implementation of the where-clause
        $this->db->where('seminars.id  =', 1);
        $this->db->or_where('seminars.id  =', 7); 
        $this->db->or_where('seminars.id  =', 12);
        $this->db->order_by('seminars_category.date', 'DESC');
        $query = $this->db->get();

它没有经过测试，只是用CI文档编写的。您当然可以使用DRY并实现where子句的循环

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希望它能起作用，或者至少给你一个它如何起作用的想法

你这里有你需要的一切：是的，我知道。所有内容都在用户指南中。您应该使用以下方法进行调试：echo$this->db->last\u query；我尝试了代码，但它显示了我的错误消息：为foreach（）提供的参数无效我已经将它添加到控制器和视图中以显示数据