我使用codeigniter框架来开发一个音乐cms。我有3个表在mysql数据库,目前工作在相册表和模型,控制器。我想选择相册表1和JOIN相册 - >cat_id与类别 - >cat_id,并获取所有类别记录。
然后我想在Soundtrack - >album_id上加入Album - >album_id,然后获取所有音轨记录A到Z。
请有人帮助我显示正确的代码信号查询,我如何可以SELECT和JOIN表然后从3个表中获取记录?
表1 - >类别 p>
-
cat_id
-
cat_name
> - cat_title
-
日期
表2 - >相簿
-
-
album_details
表3 - > Soundtrack
- track_url
- 日期
public function funcname($ id) { $ this-> db->选择('*'); $ this-> db-> from('Album a'); $ this-> db-> join('category b','b.cat_id = a.cat_id','left'); $ this-> db-> join('Soundtrack c','c.album_id = a.album_id','left'); $ this-> db-> where('c.album_id',$ id); $ this-> db-> order_by('c.track_title','asc'); $ query = $ this-> db-> get(); if($ query-> num_rows()!= 0) { return $ query-> result_array(); } else { return false; } }
I'm using codeigniter framework to develop one music cms. i have 3 tables in mysql database, Currently im working in "Album" Table and "Model, Controller". i want to SELECT "Album" Table 1 and JOIN "Album" -> "cat_id" with "Category" -> "cat_id", and fetch all categories records.
Then i want to JOIN "Album" -> "album_id" on "Soundtrack" -> "album_id" then fetch all soundtrack records A to Z.
Please somebody help me to show proper codeigniter query, how i can SELECT and JOIN Tables then fetch records from 3 tables, ?
Table 1 -> Category
cat_id
cat_name
- cat_title
date
Table 2 -> Album
- cat_id
album_id
album_title
album_details
Table 3 -> Soundtrack
album_id
track_title
- track_url
- date
Use this code in model
public function funcname($id) { $this->db->select('*'); $this->db->from('Album a'); $this->db->join('Category b', 'b.cat_id=a.cat_id', 'left'); $this->db->join('Soundtrack c', 'c.album_id=a.album_id', 'left'); $this->db->where('c.album_id',$id); $this->db->order_by('c.track_title','asc'); $query = $this->db->get(); if($query->num_rows() != 0) { return $query->result_array(); } else { return false; } }
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