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2012-10-17T02:05:05.190
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This is a good read for aggregate functions when using <a href="http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html" rel="nofollow">Group By (MySQL)</a>. A simple explanation would be like this <pre><code>Date | Amount 2012-01-01 | 5 2012-01-01 | 6 2012-01-02 | 1 2012-01-02 | 6 </code></pre> Now using SUM aggregate function like this. <pre><code>SELECT Date, SUM(Amount) as Total FROM table GROUP BY Date ORDER BY DATE; </code></pre> The result will be: <pre><code>Date | Amount 2012-01-01 | 11 2012-01-02 | 7 </code></pre> In your scenario, <code>GROUP BY</code> will not work as intended as it will only get one Category since you grouped your query by each category. The ideal solution to this is to have 2 separate functions, <code>GetCategories</code> and <code>GetServices</code>. <pre><code>function getServices($category_id = false) { $this->db->select('service_url, service_title, category_title'); $this->db->join('services_category', 'services_category.id=services.category_id'); if ($category_id !== false) $this->db->where('services.category_id', $category_id); $this->db->order_by('service_title', 'ASC'); $query = $this->db->get('services'); if($query->result() == TRUE) { foreach($query->result_array() as $row) { $result[] = $row; } return $result; } } function getCategories() { $this->db->select('category_id, category_title'); $this->db->order_by('category_title', 'ASC'); $query = $this->db->get('services_category'); if($query->result() == TRUE) { foreach($query->result_array() as $row) { $result[] = $row; } return $result; } } </code></pre> Then in your view file, you just need to do a for loop on the Categories then do another query for each Category. Here's an outline of what it will look like, <pre><code><?php if(isset($categories) && $categories) : foreach($categories as $category) : ?> <ul> <li><a href="#"><?php echo $category['category_title'] ?></a> <ul> // how you get $services is similar to how you get $categories <?php $services = $this->modelname->getServices($category['category_id']); <?php foreach($services as $s) : ?> <li><?php echo anchor('categories/' . $s['service_url'], $s['service_title']); ?></li> <?php endforeach; ?> </ul> </li> </ul> <?php endforeach; ?> <?php endif; ?> </code></pre>
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