display results on query basis in Codeigniter with Pagination - codeigniter

Question

I have a table of products. I need to display all the products. I am fetching results on different conditions.
create table `products` (
`id` double ,
`category_id` double ,
`subcategory_id` double ,
`product_name` varchar (765),
`product_description` varchar (765),
`product_viewed` varchar (765),
`sale_wanted` tinyint (2),
`added_date` datetime ,
`updated_date` datetime ,
);
I need to diplay the results like this
1. The latest products (use of added date)
2. Most Wanted (Sorting by sale_wanted 1 for sale , 2 for wanted)
3. Most Viewed (Sorting by product_viewed)
4. Sorting by Specific Subcategory
All the results should display with pagination. This is all right if i first get the result. But if i walk with pagination links all the condition data is lost and the query fetches the results without any condition. How can i manage This situation. Please i dont need Code i need hints and suggestions. The other thing is that i am using Codeigniter's pagination class.
EDITED
Here is my Model Method i am using
public function getProductsList($per_page=5,$page=0)
{
$info = $this->input->post();
if(isset($info['type']))
{
$type = $info['type'];
if($type == 'most_wanted'){
$where = " AND sale_wanted = 1";
$order_by = " ORDER BY ldc.added_date desc";
}else if($type == 'most_viewed'){
$where = " ";
$order_by = " ORDER BY ldc.product_viewed desc";
}else{
$where = " ";
$order_by = " ORDER BY ldc.added_date desc";
}
}else if(isset($info['sale_wanted']) AND isset($info['subcategory_id'])){
$sale_wanted = $info['sale_wanted'];
$subcategory_id = $info['subcategory_id'];
$where = " AND sale_wanted = $sale_wanted AND ldc.subcategory_id = $subcategory_id";
$order_by = " ORDER BY ldc.added_date desc";
}else if(isset($info['keyword'])){
$keyword = $info['keyword'];
$search_type = $info['search_type'];
$where = " AND ldc.$search_type like '$keyword%'";
$order_by = " ";
}else{
$where = " ";
$order_by = " ";
}
$num = 0;
if($page != 0){
$num = ($page * $per_page) - $per_page;
}
$sql_query = "
SELECT
ldc.id,
ldc.product_name,
ldc.product_viewed,
DATE_FORMAT(ldc.added_date, '%m/%d/%Y') as added_date,
ifnull(dc.name,'Unknown') as category,
dpi.product_image
FROM default_products AS ldc
LEFT JOIN default_manufacturers as dm ON dm.id = ldc.manufacturer
LEFT JOIN default_category as dc ON dc.category_id = ldc.category_id
LEFT JOIN ((select product_id , product_image from default_product_images group by product_id) as dpi)
ON dpi.product_id = ldc.id
WHERE approved = 1
$where
$order_by
LIMIT $num,$per_page
";
$query = $this->db->query($sql_query);
return $query->result();
}

Answer 1

i would highly recommend these two Free tutorials on codeigniter pagination -
video tutorials, working sample code ( might need to update code to CI 2.1 ), and even some helpful info in the comments.
CodeIgniter from Scratch: Displaying & Sorting Tabular Data
http://net.tutsplus.com/tutorials/php/codeigniter-from-scratch-displaying-sorting-tabular-data/
CodeIgniter from Scratch: Search Results without Query Strings
http://net.tutsplus.com/tutorials/php/codeigniter-from-scratch-search-results-without-query-strings-2/