"Default" is not the default sort order!

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Fatal error: Uncaught Exception: Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'ORDER BY LCASE(pd.name) ASC, LCASE(pd.name) ASC LIMIT 0,20' at line 1<br />Error No: 1064<br />SELECT p.product_id, (SELECT AVG(rating) AS total FROM oc_review r1 WHERE r1.product_id = p.product_id AND r1.status = '1' GROUP BY r1.product_id) AS rating, (SELECT price FROM oc_product_discount pd2 WHERE pd2.product_id = p.product_id AND pd2.customer_group_id = '1' AND pd2.quantity = '1' AND ((pd2.date_start = '0000-00-00' OR pd2.date_start < NOW()) AND (pd2.date_end = '0000-00-00' OR pd2.date_end > NOW())) ORDER BY pd2.priority ASC, pd2.price ASC LIMIT 1) AS discount, (SELECT price FROM oc_product_special ps WHERE ps.product_id = p.product_id AND ps.customer_group_id = '1' AND ((ps.date_start = '0000-00-00' OR ps.date_start < NOW()) AND (ps.date_end = '0000-00-00' OR ps.date_end > NOW())) ORDER BY ps.priority ASC, ps.price ASC LIMIT 1) AS special FROM o in /home/anoth305/public_html/shop/system/library/db/mysqli.php on line 40

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$sort = 'pd.name';

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Fatal error: Uncaught Exception: Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'ORDER BY LCASE(pd.name) DESC, LCASE(pd.name) DESC LIMIT 0,20' at line 1<br />Error No: 1064<br />SELECT p.product_id, (SELECT AVG(rating) AS total FROM oc_review r1 WHERE r1.product_id = p.product_id AND r1.status = '1' GROUP BY r1.product_id) AS rating, (SELECT price FROM oc_product_discount pd2 WHERE pd2.product_id = p.product_id AND pd2.customer_group_id = '1' AND pd2.quantity = '1' AND ((pd2.date_start = '0000-00-00' OR pd2.date_start < NOW()) AND (pd2.date_end = '0000-00-00' OR pd2.date_end > NOW())) ORDER BY pd2.priority ASC, pd2.price ASC LIMIT 1) AS discount, (SELECT price FROM oc_product_special ps WHERE ps.product_id = p.product_id AND ps.customer_group_id = '1' AND ((ps.date_start = '0000-00-00' OR ps.date_start < NOW()) AND (ps.date_end = '0000-00-00' OR ps.date_end > NOW())) ORDER BY ps.priority ASC, ps.price ASC LIMIT 1) AS special FROM in /home/anoth305/public_html/shop/system/library/db/mysqli.php on line 40

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<?php
namespace DB;
final class MySQLi {
	private $connection;

	public function __construct($hostname, $username, $password, $database, $port = '3306') {
		$this->connection = new \mysqli($hostname, $username, $password, $database, $port);

		if ($this->connection->connect_error) {
			throw new \Exception('Error: ' . $this->connection->error . '<br />Error No: ' . $this->connection->errno);
		}

		$this->connection->set_charset("utf8");
		$this->connection->query("SET SQL_MODE = 'NO_ZERO_IN_DATE,NO_ENGINE_SUBSTITUTION'") ;
	}

	public function query($sql) {
		$query = $this->connection->query($sql);

		if (!$this->connection->errno) {
			if ($query instanceof \mysqli_result) {
				$data = array();

				while ($row = $query->fetch_assoc()) {
					$data[] = $row;
				}

				$result = new \stdClass();
				$result->num_rows = $query->num_rows;
				$result->row = isset($data[0]) ? $data[0] : array();
				$result->rows = $data;

				$query->close();

				return $result;
			} else {
				return true;
			}
		} else {
			throw new \Exception('Error: ' . $this->connection->error  . '<br />Error No: ' . $this->connection->errno . '<br />' . $sql);
		}
	}

	public function escape($value) {
		return $this->connection->real_escape_string($value);
	}
	
	public function countAffected() {
		return $this->connection->affected_rows;
	}

	public function getLastId() {
		return $this->connection->insert_id;
	}
	
	public function connected() {
		return $this->connection->ping();
	}
	
	public function __destruct() {
		$this->connection->close();
	}
}