made some refactoring

src/Database/DB.php

@@ -0,0 +1,105 @@
+<?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
+ */
+
+declare(strict_types = 1);
+
+namespace Database;
+
+use RuntimeException;
+
+/**
+ * DB class
+ */
+class DB
+{
+    private mixed $adaptor;
+
+    /**
+     * Constructor
+     *
+     * @param  string  $adaptor
+     * @param  string  $hostname
+     * @param  string  $username
+     * @param  string  $password
+     * @param  string  $database
+     * @param  int|null  $port
+     *
+     */
+    public function __construct(
+        string $adaptor,
+        string $hostname,
+        string $username,
+        string $password,
+        string $database,
+        int $port = null
+    ) {
+        $class = 'DB\\' . $adaptor;
+
+        if (class_exists($class)) {
+            $this->adaptor = new $class($hostname, $username, $password, $database, $port);
+        } else {
+            throw new RuntimeException('Error: Could not load database adaptor ' . $adaptor . '!');
+        }
+    }
+
+    /**
+     *
+     *
+     * @param  string  $sql
+     *
+     * @return    array
+     */
+    public function query(string $sql): array
+    {
+        return $this->adaptor->query($sql);
+    }
+
+    /**
+     *
+     *
+     * @param  string  $value
+     *
+     * @return    string
+     */
+    public function escape(string $value): string
+    {
+        return $this->adaptor->escape($value);
+    }
+
+    /**
+     *
+     *
+     * @return    int
+     */
+    public function countAffected(): int
+    {
+        return $this->adaptor->countAffected();
+    }
+
+    /**
+     *
+     *
+     * @return    int
+     */
+    public function getLastId(): int
+    {
+        return $this->adaptor->getLastId();
+    }
+
+    /**
+     *
+     *
+     * @return    bool
+     */
+    public function connected(): bool
+    {
+        return $this->adaptor->connected();
+    }
+}