只检索一行评论

Question

我在codeigniter中开发了一个网站，我想在其中检索特定T恤的评论。 我有一个这样的桌三通：

- id
- user_id
- name
- created
- modified

像这样的表tee_comments：

- id
- user_id
- tee_id
- created
- modified

我已经完成了以下查询：

 $this->db->select('*,tee.id as id,tee.created as created, tee_comments.id as tee_comments_id, tee_comments.created as tee_comments_created, tee_comments.modified as tee_comments_modified');
    $this->db->from('tee');
    $this->db->join('tee_comments', 'tee_comments.tee_id = tee.id','left outer');
    $this->db->order_by("tee.created", "desc");
    $query = $this->db->get();

通过此查询，我检索了两行tee，因为在该tee中有两个注释。

我的目标是仅检索其中包含注释数组的一行：

tee{
  id,
  name,
  created,
  modified
  comment{
     [0]
         id,
         tee_id,
         comment,
         created,
         modified
     [1]
         id,
         tee_id,
         comment,
         created,
         modified
  }
}

我已尝试加入连接：-左-右-左外部-右外部

但是不能解决问题，有办法吗？ 谢谢

Answer 1

我爱CodeIgniter！ 我经常使用它！ 您在这里有2个非常简单的选项：

一种方法是使用limit 。

$this->db->select('*,tee.id as id,tee.created as created, tee_comments.id as tee_comments_id, tee_comments.created as tee_comments_created, tee_comments.modified as tee_comments_modified');
$this->db->join('tee_comments', 'tee_comments.tee_id = tee.id','left outer');
$this->db->order_by("tee.created", "desc");
$query = $this->db->limit(1)->get('tee');

---

另一种方法是获取results Array第一项

$query = $this->db->get();
$results = $query->result(); // gets return as an array
$row = $results[0]; // will be first row in results array

请记住， $row将作为object(stdClass)返回，这意味着您必须从中检索诸如$row->column_name之类的东西。

拨打电话后，我喜欢使用一个方便的小片段。 它使该行成为Object的Array 。

$results = $db->get('tee')->result(); // snippet comes after you have result array
// snippet here
foreach ($r as $k => $v) { $results[$k] = array(); foreach ($v as $kk => $vv) { $results[$k][$kk] = $vv != "NULL" ? trim($vv) : ""; } }

Answer 2

使用$this->db->limit(1)检索单个记录。

根据对此问题的公认答案，您可能需要在选择之前添加限制声明：

$this->db->limit(1);
$this->db->select('*,tee.id as id,tee.created as created, tee_comments.id as tee_comments_id, tee_comments.created as tee_comments_created, tee_comments.modified as tee_comments_modified');
$this->db->from('tee');

Answer 3

选项一：

for ($i = 0; $i < count($records); $i++)
{
 $data = $records[$i];
 // work with date.
 if($i == 1)
   break;
}

选项二：只将第一行分配给var。

$row = $records['tee']['comment'][0];