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system/Database/MySQLi/Utils.php

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+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\Database\MySQLi;
+
+use CodeIgniter\Database\BaseUtils;
+use CodeIgniter\Database\Exceptions\DatabaseException;
+
+/**
+ * Utils for MySQLi
+ */
+class Utils extends BaseUtils
+{
+    /**
+     * List databases statement
+     *
+     * @var string
+     */
+    protected $listDatabases = 'SHOW DATABASES';
+
+    /**
+     * OPTIMIZE TABLE statement
+     *
+     * @var string
+     */
+    protected $optimizeTable = 'OPTIMIZE TABLE %s';
+
+    /**
+     * Platform dependent version of the backup function.
+     *
+     * @return mixed
+     */
+    public function _backup(?array $prefs = null)
+    {
+        throw new DatabaseException('Unsupported feature of the database platform you are using.');
+    }
+}