C:/xampp/htdocs/moodle/mod/url/db/upgrade.php

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<?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/>.

defined('MOODLE_INTERNAL') || die;

function xmldb_url_upgrade($oldversion) {
    global $CFG, $DB;

    $dbman = $DB->get_manager();

    // Moodle v2.1.0 release upgrade line
    // Put any upgrade step following this
    if ($oldversion < 2011092800) {

        // Changing nullability of field externalurl on table urls to not-null
        $table = new xmldb_table('url');
        $field = new xmldb_field('externalurl', XMLDB_TYPE_TEXT, 'small', null,
                XMLDB_NOTNULL, null, null, 'introformat');

        $DB->set_field_select('url', 'externalurl', $DB->sql_empty(), 'externalurl IS NULL');
        // Launch change of nullability for field =externalurl
        $dbman->change_field_notnull($table, $field);

        // url savepoint reached
        upgrade_mod_savepoint(true, 2011092800, 'url');
    }

    // Moodle v2.2.0 release upgrade line
    // Put any upgrade step following this

    return true;
}