Question

我仍然对codeigniter分页感到困惑。我制作如下模型和控制器文件：

我的模特：

function getAllBooks($limit, $offset)
{
    $query = $this->db->query("SELECT * FROM books as b LEFT JOIN publishers as p ON b.publishers_id=p.publishers_id LEFT JOIN categories as c ON b.cat_id=c.cat_id ORDER BY books_id DESC LIMIT $limit, $offset");

    return $query;
}

function getCount($table)
{
    $query = $this->db->query("SELECT * FROM $table");
    return $query;
}

我的控制器

public function page()
{
    $offset = '';
    if($this->uri->segment(3) == FALSE){
        $offset = 0;
    }else{
        $offset = $this->uri->segment(3);
    }

    $limit = 3;

    $data['books'] = $this->model_front->getAllBooks($limit, $offset);
    $all_pages = $this->model_front->getCount('books');

    $config['base_url'] = base_url() . 'catalog/page/';
    $config['total_rows'] = $all_pages->num_rows();
    $config['per_page'] = $limit;
    $config['uri_segment'] = 3;
    $config['use_page_numbers']  = TRUE;

    ...

    $this->pagination->initialize($config);

    ....
}

代码成功运行。但让我感到困惑的是这个计划正在发生：

Item 1 | Item 2 | Item 3 | // for main view

当我点击下一个按钮时，结果是这样的，依此类推：

Item 3 | Item 4 | Item 5 | // Second page
Item 4 | Item 5 | Item 6 | // Third page
Item 5 | Item 6 | Item 7 | // Fourth page

仅供参考，我有10条测试记录，我希望每页显示3条记录。我仍然困惑如何在每页显示3条记录：

Item 1 | Item 2 | Item 3 | // Main view
Item 4 | Item 5 | Item 6 | // Second page
Item 7 | Item 8 | Item 9 | // Third page
Item 10 | empty | empty | // Last page

请指教。我希望你理解我的问题的意图。

提前致谢

Answer 1

您只是与$offset和$limit混淆了。第一个参数指定要返回的第一行的偏移量，第二个参数指定要返回的最大行数。

在$offset = ($this->uri->segment(3)-1) * $limit)部分中使用此代码else，然后在if语句之前向上移动变量$limit = 3;。

//Your code
$offset = '';
$limit = 3;
if($this->uri->segment(3) == FALSE){
    $offset = 0;
}else{
    $offset = ($this->uri->segment(3)-1) * $limit);
}
//Your code

使用此查询：

SELECT * FROM books as b LEFT JOIN publishers as p ON b.publishers_id=p.publishers_id LEFT JOIN categories as c ON b.cat_id=c.cat_id ORDER BY books_id DESC LIMIT $offset,$limit

OR

SELECT * FROM books as b LEFT JOIN publishers as p ON b.publishers_id=p.publishers_id LEFT JOIN categories as c ON b.cat_id=c.cat_id ORDER BY books_id DESC LIMIT $limit OFFSET $offset;

而不是

SELECT * FROM books as b LEFT JOIN publishers as p ON b.publishers_id=p.publishers_id LEFT JOIN categories as c ON b.cat_id=c.cat_id ORDER BY books_id DESC LIMIT $limit, $offset

管理Codeigniter分页

1 个答案: