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diff --git a/dom/quota/StorageHelpers.h b/dom/quota/StorageHelpers.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef DOM_QUOTA_QUOTADATABASEHELPER_H
+#define DOM_QUOTA_QUOTADATABASEHELPER_H
+
+#include "mozilla/dom/quota/QuotaCommon.h"
+#include "mozIStorageConnection.h"
+#include "nsCOMPtr.h"
+#include "nsString.h"
+
+namespace mozilla::dom::quota {
+
+/**
+ * This class provides a RAII wrap of attaching and detaching database
+ * in a given C++ scope. It is guaranteed that an attached database will
+ * be detached even if you have an exception or return early.
+ *
+ * @param aConnection
+ *        The connection to attach a database to.
+ * @param aDatabaseFile
+ *        The database file to attach.
+ * @param aSchemaName
+ *        The schema-name. Can be any string literal which is supported by the
+ *        underlying database. For more details about schema-name, see
+ *        https://www.sqlite.org/lang_attach.html
+ */
+class MOZ_STACK_CLASS AutoDatabaseAttacher final {
+ public:
+  explicit AutoDatabaseAttacher(nsCOMPtr<mozIStorageConnection> aConnection,
+                                nsCOMPtr<nsIFile> aDatabaseFile,
+                                const nsLiteralCString& aSchemaName);
+
+  ~AutoDatabaseAttacher();
+
+  AutoDatabaseAttacher() = delete;
+
+  [[nodiscard]] nsresult Attach();
+
+  [[nodiscard]] nsresult Detach();
+
+ private:
+  nsCOMPtr<mozIStorageConnection> mConnection;
+  nsCOMPtr<nsIFile> mDatabaseFile;
+  const nsLiteralCString mSchemaName;
+  bool mAttached;
+};
+
+}  // namespace mozilla::dom::quota
+
+#endif  // DOM_QUOTA_QUOTADATABASEHELPER_H