Codeigniter分页不显示查询结果的第一行

Question

正如您在下面看到的，我正在查询数据库以获取问题列表。

我的模型返回问题计数 ( count_questions() ) 以及问题本身 ( get_questions($args) )，然后进行分页。

    $limit  = '10';
    $count  = $this->forum_model->count_questions();
    $offset    = $this->uri->segment(3, 0);

    $this->load->library('pagination');

    $config['base_url']         = base_url() . 'forum/all/';
    $config['total_rows']       = $count;
    $config['per_page']         = $limit;
    $config['full_tag_open']    = '<div class="pagination">';
    $config['full_tag_close']   = '</div>';
    $config['uri_segment']          = 3;

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

    $data['q']          = $this->forum_model->get_questions(NULL, $limit, $offset);

    $data['pag_links']  = $this->pagination->create_links();

我看到的奇怪行为是 count_questions() 返回“25”（这是正确的）。

但分页输出显示 24 个问题，跳过数据库中的第一行/问题。

起初我以为这可能是因为偏移量错误，但在第一页中它被设置为 0。

如果我不使用分页，我的控制器会将所有 25 个问题输出到我的视图中。所以我正在做的分页限制/偏移量似乎可能是罪魁祸首。

有什么想法这里可能有什么问题吗？

谢谢你的帮助。

模型 (get_questions)

function get_questions($forum_qa_id = NULL, $limit = NULL, $offset = NULL)
{
    ($forum_qa_id === NULL) ? ($forum_qa_id = "'%'") : ($forum_qa_id = $forum_qa_id);
    ($limit       === NULL) ? ($limit = 1) : ($limit = $limit);
    ($offset      === NULL) ? ($offset = 0) : ($offset = $offset);

    $query = $this->db->query("
    SELECT forum_qa.*,
           user_profiles.*,
           c.*,
           n.pid,
           v.*,
           Ifnull(n.ans_count, 0) AS ans_count
    FROM   forum_qa
           JOIN user_profiles
             ON user_id = forum_qa_author_id
           LEFT JOIN (SELECT *
                      FROM   votes) AS v
             ON forum_qa_id = v.forum_qa_id_fk
           LEFT JOIN (SELECT forum_cm_id,
                             forum_cm_author_id,
                             forum_qa_id_fk,
                             forum_cm_text,
                             forum_cm_timestamp,
                             forum_cm_flag,
                             first_name  AS forum_cm_first_name,
                             last_name   AS forum_cm_last_name,
                             facebook_id AS forum_cm_fb_id,
                             picture     AS forum_cm_picture,
                             moderator   AS forum_cm_moderator
                      FROM   forum_cm
                             JOIN user_profiles
                               ON user_id = forum_cm_author_id) AS c
             ON forum_qa_id = c.forum_qa_id_fk
           LEFT JOIN (SELECT forum_qa_parent_id AS pid,
                             COUNT(*)           AS ans_count
                      FROM   forum_qa
                      WHERE  forum_qa_parent_id IS NOT NULL
                      GROUP  BY forum_qa_parent_id) AS n
             ON forum_qa_id = n.pid
    WHERE  forum_qa_id LIKE $forum_qa_id
           AND forum_qa_parent_id IS NULL
    ORDER  BY forum_qa_timestamp DESC
    LIMIT  $limit
    OFFSET $offset;     
    ");

模型 (count_questions)

function count_questions()
{
    $query = $this->db->query("
    SELECT  *
    FROM    forum_qa
    WHERE   forum_qa_type = 1;
    ");

    return $query->num_rows;
}

Answer 1

return $query->num_rows; 应该是 return $query->num_rows();。

另外，尝试将 LIMIT $limit OFFSET $offset 更改为 LIMIT $offset,$limit。

Answer 2

$this->uri->segment(3, 0);

默认情况下，如果该段不存在，该函数将返回 FALSE（布尔值）。所以我觉得不对！？

($offset      === NULL) ? ($offset = 0) : ($offset = $offset);

Answer 3

问题是，当默认页面执行时，它从第一行开始记录而不是零，这就是第一行丢失的原因。我应用了以下代码来解决这个问题

$page = ($this->uri->segment(3)) ？ $this->uri->segment(3) : 0;

请根据您的请求 URL 编辑分段