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

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<?php

// This file keeps track of upgrades to
// the survey module
//
// Sometimes, changes between versions involve
// alterations to database structures and other
// major things that may break installations.
//
// The upgrade function in this file will attempt
// to perform all the necessary actions to upgrade
// your older installation to the current version.
//
// If there's something it cannot do itself, it
// will tell you what you need to do.
//
// The commands in here will all be database-neutral,
// using the methods of database_manager class
//
// Please do not forget to use upgrade_set_timeout()
// before any action that may take longer time to finish.

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

    $dbman = $DB->get_manager();

//===== 1.9.0 upgrade line ======//

    if ($oldversion < 2009042002) {

        $table = new xmldb_table('survey');
        $field = new xmldb_field('introformat', XMLDB_TYPE_INTEGER, '4', XMLDB_UNSIGNED, XMLDB_NOTNULL, null, '0', 'intro');

        if (!$dbman->field_exists($table, $field)) {
            $dbman->add_field($table, $field);
        }

        // conditionally migrate to html format in intro
        if ($CFG->texteditors !== 'textarea') {
            $rs = $DB->get_recordset('survey', array('introformat'=>FORMAT_MOODLE), '', 'id,intro,introformat');
            foreach ($rs as $s) {
                $s->intro       = text_to_html($s->intro, false, false, true);
                $s->introformat = FORMAT_HTML;
                $DB->update_record('survey', $s);
                upgrade_set_timeout();
            }
            $rs->close();
        }

        upgrade_mod_savepoint(true, 2009042002, 'survey');
    }

    // Moodle v2.1.0 release upgrade line
    // Put any upgrade step following this

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

    return true;
}