[英]Codeigniter pagination not showing first row of query result
As you can see below I am querying the database for a list of questions.正如您在下面看到的,我正在查询数据库以获取问题列表。
My model returns a count of questions ( count_questions()
) as well as the questions themselves ( get_questions($args)
) which are then paginated.我的 model 返回问题计数(
count_questions()
)以及问题本身( get_questions($args)
),然后分页。
$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'] = $this->pagination->create_links();
The odd behavior I am seeing is that count_questions()
returns '25' (which is correct).我看到的奇怪行为是
count_questions()
返回“25”(这是正确的)。
But the pagination output shows 24 questions, skipping the first row/question in my database.但是分页 output 显示 24 个问题,跳过了我数据库中的第一行/问题。
At first I thought this could be because of wrong offset, but it is set to 0 in the first page.起初我以为这可能是因为偏移量错误,但在第一页它被设置为 0。
If I do NOT use pagination, my controller outputs all 25 questions to my view.如果我不使用分页,我的 controller 会将所有 25 个问题输出到我的视图中。 So there seems to be something I'm doing with pagination limit/offset that may be the culprit.
所以似乎我正在对分页限制/偏移量做一些事情,这可能是罪魁祸首。
Any ideas what might be wrong here?任何想法这里可能有什么问题?
Thanks for helping.感谢您的帮助。
Model (get_questions) Model (get_questions)
function get_questions($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;
");
Model (count_questions) Model (count_questions)
function count_questions()
{
$query = $this->db->query("
SELECT *
FROM forum_qa
WHERE forum_qa_type = 1;
");
return $query->num_rows;
}
return $query->num_rows;
should be return $query->num_rows();
应该
return $query->num_rows();
. .
Also, try changing LIMIT $limit OFFSET $offset
to LIMIT $offset,$limit
.另外,尝试将
LIMIT $limit OFFSET $offset
更改为LIMIT $offset,$limit
。
Problem is, when default page execute it start record from 1st row instead zero, that's why first row is missing.
问题是,当默认页面执行时,它从第一行而不是零开始记录,这就是第一行丢失的原因。 I applied following code to fix this problem
我应用了以下代码来解决这个问题
$page = ($this->uri->segment(3))? $page = ($this->uri->segment(3))? $this->uri->segment(3): 0;
$this->uri->segment(3): 0;
Please edit segment as per your request URL请根据您的要求编辑段 URL
$this->uri->segment(3, 0);
By default the function returns FALSE (boolean) if the segment does not exist.默认情况下,如果段不存在,function 返回 FALSE(布尔值)。 so i think isn't right??
所以我觉得不对??
($offset === NULL) ? ($offset = 0) : ($offset = $offset);
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