代码点火器计数功能

spo*_*nap 1 php codeigniter

我想要做的是我想从我的数据库中计算名为"songs_tbl"的表中的总记录数.所以我在控制器中写了这个函数.

private function getHeaderInfo()
{
         $total_songs = $songs->count('distinct songs_tbl.song_id');
         $this->mysmarty->assign('total_songs',$total_songs);
}   
Run Code Online (Sandbox Code Playgroud)

我收到了这个错误

致命错误:调用非对象中的成员函数count()

有什么建议吗?谢谢.

带着敬意,

Cub*_*Eye 5

我想你正在寻找:

$this->db->count_all('songs_tbl');
Run Code Online (Sandbox Code Playgroud)

或者如果你想要那里的独特,你需要做这样的事情:

$this->db->select('song_id');
$this->db->distinct();
$this->db->from('songs_tbl');
$query = $this->db->get();
return $query->num_rows();
Run Code Online (Sandbox Code Playgroud)

有/有吗?使用count_all_results()函数和DISTINCT的问题

编辑

我从来没有使用过smarty,但基于问题中的代码我想象这样的东西可能有用,如果我错了,请纠正我:

private function getHeaderInfo()
{
    $total_songs = get_all_songs();// This function should be called through a model
    $this->mysmarty->assign('total_songs',$total_songs);
}

function get_all_songs(){ //THIS SHOULD BE IN A MODEL
    $this->db->select('song_id');
    $this->db->distinct();
    $this->db->from('songs_tbl');
    $query = $this->db->get();
    return $query->num_rows();
}
Run Code Online (Sandbox Code Playgroud)

编辑2

我建议的布局将是使用CodeIgniter而不是聪明的这些行(UNTESTED):

型号Song.php

class Song extends CI_Model {
    //Constructor and other functions

    function count_all_songs(){
        $this->db->select('song_id');
        $this->db->distinct();
        $this->db->from('songs_tbl');
        $query = $this->db->get();
        return $query->num_rows();
    }
}
Run Code Online (Sandbox Code Playgroud)

Controller Songs.php

class Song extends CI_Controller {
    //Constructor and other functions

    function index(){ //This could be any page
        $this->load->model('Song'); //Could be in constructor
        $total_songs = $this->Song->count_all_songs();
        $this->load->view('songs_index.html', array('total_songs' => $total_songs));
    }
}
Run Code Online (Sandbox Code Playgroud)

查看songs_index.html

<html><head></head><body>
    Total Songs: <?php echo $total_songs ?>
</body></html>
Run Code Online (Sandbox Code Playgroud)