OpenCart 🇺🇦

$sql = "SELECT * FROM " . DB_PREFIX . "product p LEFT JOIN " . DB_PREFIX . "product_description pd ON (p.product_id = pd.product_id)";

if (!empty($data['filter_category_id'])) {
	$sql .= " LEFT JOIN " . DB_PREFIX . "product_to_category p2c ON (p.product_id = p2c.product_id)";			
}

$sql .= " WHERE pd.language_id = '" . (int)$this->config->get('config_language_id') . "'"; 

if (!empty($data['filter_name'])) {
	$sql .= " AND pd.name LIKE '" . $this->db->escape($data['filter_name']) . "%'";
}

if (!empty($data['filter_model'])) {
	$sql .= " AND p.model LIKE '" . $this->db->escape($data['filter_model']) . "%'";
}

if (!empty($data['filter_price'])) {
	$sql .= " AND p.price LIKE '" . $this->db->escape($data['filter_price']) . "%'";
}

if (isset($data['filter_quantity']) && !is_null($data['filter_quantity'])) {
	$sql .= " AND p.quantity = '" . $this->db->escape($data['filter_quantity']) . "'";
}

if (isset($data['filter_status']) && !is_null($data['filter_status'])) {
	$sql .= " AND p.status = '" . (int)$data['filter_status'] . "'";
}

$sql .= " GROUP BY p.product_id";

$sort_data = array(
	'pd.name',
	'p.model',
	'p.price',
	'p.quantity',
	'p.status',
	'p.sort_order'
);	

if (isset($data['sort']) && in_array($data['sort'], $sort_data)) {
	$sql .= " ORDER BY " . $data['sort'];	
} else {
	$sql .= " ORDER BY pd.name";	
}

if (isset($data['order']) && ($data['order'] == 'DESC')) {
	$sql .= " DESC";
} else {
	$sql .= " ASC";
}

if (isset($data['start']) || isset($data['limit'])) {
	if ($data['start'] < 0) {
		$data['start'] = 0;
	}				

	if ($data['limit'] < 1) {
		$data['limit'] = 20;
	}	

	$sql .= " LIMIT " . (int)$data['start'] . "," . (int)$data['limit'];
}	

$query = $this->db->query($sql);

return $query->rows;