system/library/db.php

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<?php
/**
 * @package        OpenCart
 * @author        Daniel Kerr
 * @copyright    Copyright (c) 2005 - 2017, OpenCart, Ltd. (https://www.opencart.com/)
 * @license        https://opensource.org/licenses/GPL-3.0
 * @link        https://www.opencart.com
 */

/**
 * DB class
 */
class DB
{
    private $adaptor;

    /**
     * Constructor
     *
     * @param    string $adaptor
     * @param    string $hostname
     * @param    string $username
     * @param    string $password
     * @param    string $database
     * @param    int $port
     * @throws Exception
     */
    public function __construct($adaptor, $hostname, $username, $password, $database, $port = NULL)
    {
        $class = 'DB\\' . $adaptor;

        if (class_exists($class)) {
            $this->adaptor = new $class($hostname, $username, $password, $database, $port);
        } else {
            throw new \Exception('Error: Could not load database adaptor ' . $adaptor . '!');
        }
    }

    public function getAdaptor()
    {
        return $this->adaptor;
    }

    /**
     *
     *
     * @param    string $sql
     *
     * @return    array
     */
    public function query($sql)
    {
        return $this->adaptor->query($sql);
    }

    /**
     *
     *
     * @param    string $value
     *