How to get previous and next posts in codeigniter blog post page - php

Question

I'm making a blog in Codeigniter. Now on the blog post view page, I want the previous and next post link. This is my controller of blog details.
public function blog_details($slug = NULL){
//data
$data['blog_info'] = $this->Blog_model->get_posts($slug);
if(empty($data['blog_info'])){
show_404();
}
$data['post_name'] = $data['blog_info']['post_name'];//post name
$data['categories'] = $this->Blog_model->get_categories();
//meta title, discription, keywords
$data['meta_title'] = $data['blog_info']['post_name'];
$data['meta_description'] = $data['blog_info']['post_meta'];
$data['meta_keywords'] = $data['blog_info']['post_tags'];
//view
$data['main_content'] = 'blog_details';
$this->load->view('include/template',$data);
}
and my model is
public function get_posts($slug = FALSE, $limit = TRUE, $offset = FALSE){
if($limit){
$this->db->limit($limit, $offset);
}
if($slug === FALSE){
$this->db->order_by('blogs.post_id', 'DESC');
$this->db->join('category', 'category.category_name = blogs.category');
$query = $this->db->get('blogs');
return $query->result_array();
}
$query = $this->db->get_where('blogs', array('post_slug' => $slug));
return $query->row_array();
}
How to create previous and next post links with post names? Thanks in advance.

Answer 1

you can use direct query method to run below query and just pass your blog id to get previus and next blog name
public function get_prewnext($id){
$query = $this->db->query("SELECT name,
(SELECT name FROM blog s1
WHERE s1.id < s.id
ORDER BY id DESC LIMIT 1) as previous_name,
(SELECT name FROM blog s2
WHERE s2.id > s.id
ORDER BY id ASC LIMIT 1) as next_name
FROM blog s
WHERE id = $id;");
if($query->num_rows() > 0){
$data = $query->result_array();
}
$query->free_result();
return $data;
}
Note: If value is not found then it will return null.