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diff --git a/src/lib/mysql/mysql_constants.h b/src/lib/mysql/mysql_constants.h
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+++ b/src/lib/mysql/mysql_constants.h
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+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// 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 MYSQL_CONSTANTS_H
+#define MYSQL_CONSTANTS_H
+
+#include <mysql.h>
+
+namespace isc {
+namespace db {
+
+/// @name MySQL constants.
+///
+//@{
+
+/// @brief my_bools type for vectors.
+/// @note vector<bool> is specialized into a bitset, so vector<char>
+/// must be used instead
+typedef char my_bools;
+
+#ifdef HAVE_MYSQL_MY_BOOL
+/// @brief MySQL false value.
+const my_bool MLM_FALSE = 0;
+
+/// @brief MySQL true value.
+const my_bool MLM_TRUE = 1;
+
+#else
+/// @brief my_bool type in MySQL 8.x.
+typedef bool my_bool;
+
+/// @brief MySQL false value.
+const my_bool MLM_FALSE = false;
+
+/// @brief MySQL true value.
+const my_bool MLM_TRUE = true;
+#endif
+
+///@brief check for bool size
+static_assert(sizeof(my_bool) == sizeof(char), "unsupported bool size");
+
+/// @brief MySQL fetch success code.
+const int MLM_MYSQL_FETCH_SUCCESS = 0;
+
+/// @brief MySQL fetch failure code.
+const int MLM_MYSQL_FETCH_FAILURE = 0;
+
+//@}
+
+/// @name Current database schema version values.
+//@{
+const uint32_t MYSQL_SCHEMA_VERSION_MAJOR = 14;
+const uint32_t MYSQL_SCHEMA_VERSION_MINOR = 0;
+
+//@}
+
+
+} // end of namespace isc::db
+} // end of namespace isc
+
+#endif