Infinite scroll for sql items - sql

Question

I'm trying to a segment of code which is behaving strange.
I am using the Paul Irish infinite scroll with the JQuery masonry plugin to display content.
The content is pulled by sql and has a set number, currently 20.
This means the page will load the first 20 rows of content from the database, then will load the next 20 upon scrolling down.
I have this functionality on a few pages and it works fine except for one page.
On this page instead of loading the most recent 20 posts, it loads every post in that particular field. Some have over 5000 posts so it literally crashes the page. A major problem as you can imagine.
I have been trying to adapt the code to look for anomalies and have narrowed it down (I think) to one particular segment.
This is the code used on a page that works:
function index() {
$userID = false;
$order = false;
$limit = $this->config->item('pin_load_limit');
$page = $this->uri->segment(3, 1);
$nextOffset = ($page -1) * $limit;
$nextPage = $page +1;
$sql = "SELECT *
FROM
pins";
if ($userID)
$sql .= " WHERE
user_id= $userID ";
if ($order) {
$sql .= " ORDER BY
' $order'";
} else {
$sql .= " ORDER BY time DESC";
}
$sql .= " LIMIT $nextOffset,$limit";
$query = $this->db->query($sql);
if ($query->num_rows() > 0) {
$row = $query->result();
}
This is the code on the page that doesn't work:
function getEachBoardPins($id,$limit=false)
{
$sql = "SELECT
*
FROM
pins
WHERE
board_id = $id
ORDER BY time DESC";
if($limit)
$sql .=" LIMIT 0 ,$limit" ;
$query = $this->db->query($sql);
return $query->result();
}
I know it is to do with the pin load limit but I have tried adding the code to the latter without success.
Perhaps somebody on here who knows more about it can provide some better insight?

Answer 1

I imagine that it is VERY LIKELY that when you call the "getEachBoardPins" function, you aren't setting the second parameter, hence, it is defaulting to false, hence, the limit SQL isn't being appended, so the select statement will run the whole statement.