MDL-27982 convert all signed to unsigned and prevent adding of new unsigned columns

[moodle.git] / lib / db / upgradelib.php

<?php

// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Upgrade helper functions
 *
 * This file is used for special upgrade functions - for example groups and gradebook.
 * These functions must use SQL and database related functions only- no other Moodle API,
 * because it might depend on db structures that are not yet present during upgrade.
 * (Do not use functions from accesslib.php, grades classes or group functions at all!)
 *
 * @package    core
 * @subpackage admin
 * @copyright  2007 Petr Skoda (http://skodak.org)
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

defined('MOODLE_INTERNAL') || die();