//.........这里部分代码省略.........
        $params = array('plugin' => 'editor_atto', 'name' => 'version');
        $attoversion = $DB->get_record('config_plugins', $params, 'value', IGNORE_MISSING);
        if ($attoversion) {
            $attoversion = floatval($attoversion->value);
        }
        // Only these versions that were part of 2.6 beta should be removed.
        // Manually installed versions of 2.5 - or later releases for 2.6 installed
        // via the plugins DB should not be uninstalled.
        if ($attoversion && $attoversion > 2013051500.0 && $attoversion < 2013102201.0) {
            // Remove all other associated config.
            unset_all_config_for_plugin('editor_atto');
            unset_all_config_for_plugin('atto_bold');
            unset_all_config_for_plugin('atto_clear');
            unset_all_config_for_plugin('atto_html');
            unset_all_config_for_plugin('atto_image');
            unset_all_config_for_plugin('atto_indent');
            unset_all_config_for_plugin('atto_italic');
            unset_all_config_for_plugin('atto_link');
            unset_all_config_for_plugin('atto_media');
            unset_all_config_for_plugin('atto_orderedlist');
            unset_all_config_for_plugin('atto_outdent');
            unset_all_config_for_plugin('atto_strike');
            unset_all_config_for_plugin('atto_title');
            unset_all_config_for_plugin('atto_underline');
            unset_all_config_for_plugin('atto_unlink');
            unset_all_config_for_plugin('atto_unorderedlist');
        }
        // Main savepoint reached.
        upgrade_main_savepoint(true, 2013102201.0);
    }
    if ($oldversion < 2013102500.01) {
        // Find all fileareas that have missing root folder entry and add the root folder entry.
        if (empty($CFG->filesrootrecordsfixed)) {
            upgrade_fix_missing_root_folders();
            // To skip running the same script on the upgrade to the next major release.
            set_config('filesrootrecordsfixed', 1);
        }
        // Main savepoint reached.
        upgrade_main_savepoint(true, 2013102500.01);
    }
    if ($oldversion < 2013110500.01) {
        // MDL-38228. Corrected course_modules upgrade script instead of 2013021801.01.
        // This upgrade script fixes the mismatches between DB fields course_modules.section
        // and course_sections.sequence. It makes sure that each module is included
        // in the sequence of at least one section.
        // There is also a separate script for admins: admin/cli/fix_course_sortorder.php
        // This script in included in each major version upgrade process so make sure we don't run it twice.
        if (empty($CFG->movingmoduleupgradescriptwasrun)) {
            upgrade_course_modules_sequences();
            // To skip running the same script on the upgrade to the next major release.
            set_config('movingmoduleupgradescriptwasrun', 1);
        }
        // Main savepoint reached.
        upgrade_main_savepoint(true, 2013110500.01);
    }
    if ($oldversion < 2013110600.01) {
        if (!file_exists($CFG->dirroot . '/theme/mymobile')) {
            // Replace the mymobile settings.
            $DB->set_field('course', 'theme', 'clean', array('theme' => 'mymobile'));
            $DB->set_field('course_categories', 'theme', 'clean', array('theme' => 'mymobile'));
            $DB->set_field('user', 'theme', 'clean', array('theme' => 'mymobile'));
            $DB->set_field('mnet_host', 'theme', 'clean', array('theme' => 'mymobile'));
            // Replace the theme configs.
            if (get_config('core', 'theme') === 'mymobile') {
                set_config('theme', 'clean');
            }

 public function test_upgrade_fix_missing_root_folders()
 {
     global $DB, $SITE;
     $this->resetAfterTest(true);
     // Setup some broken data...
     // Create two resources (and associated file areas).
     $this->setAdminUser();
     $resource1 = $this->getDataGenerator()->get_plugin_generator('mod_resource')->create_instance(array('course' => $SITE->id));
     $resource2 = $this->getDataGenerator()->get_plugin_generator('mod_resource')->create_instance(array('course' => $SITE->id));
     // Delete the folder record of resource1 to simulate broken data.
     $context = context_module::instance($resource1->cmid);
     $selectargs = array('contextid' => $context->id, 'component' => 'mod_resource', 'filearea' => 'content', 'itemid' => 0);
     // Verify file records exist.
     $areafilecount = $DB->count_records('files', $selectargs);
     $this->assertNotEmpty($areafilecount);
     // Delete the folder record.
     $folderrecord = $selectargs;
     $folderrecord['filepath'] = '/';
     $folderrecord['filename'] = '.';
     // Get previous folder record.
     $oldrecord = $DB->get_record('files', $folderrecord);
     $DB->delete_records('files', $folderrecord);
     // Verify the folder record has been removed.
     $newareafilecount = $DB->count_records('files', $selectargs);
     $this->assertSame($newareafilecount, $areafilecount - 1);
     $this->assertFalse($DB->record_exists('files', $folderrecord));
     // Run the upgrade step!
     upgrade_fix_missing_root_folders();
     // Verify the folder record has been restored.
     $newareafilecount = $DB->count_records('files', $selectargs);
     $this->assertSame($newareafilecount, $areafilecount);
     $newrecord = $DB->get_record('files', $folderrecord, '*', MUST_EXIST);
     // Verify the hash is correctly created.
     $this->assertSame($oldrecord->pathnamehash, $newrecord->pathnamehash);
 }

//.........这里部分代码省略.........
        $sql = "UPDATE {license}\n                   SET source = :url, version = :newversion\n                 WHERE shortname = :shortname AND version = :oldversion";
        $params = array('url' => 'http://creativecommons.org/licenses/by-nc/3.0/', 'shortname' => 'cc-nc', 'newversion' => '2013051500', 'oldversion' => '2010033100');
        $DB->execute($sql, $params);
        // Main savepoint reached.
        upgrade_main_savepoint(true, 2013051400.01);
    }
    if ($oldversion < 2013051400.06) {
        // Clean up old tokens which haven't been deleted.
        $DB->execute("DELETE FROM {user_private_key} WHERE NOT EXISTS\n                         (SELECT 'x' FROM {user} WHERE deleted = 0 AND id = userid)");
        // Main savepoint reached.
        upgrade_main_savepoint(true, 2013051400.06);
    }
    if ($oldversion < 2013051401.01) {
        // Remove orphan repository instances.
        if ($DB->get_dbfamily() === 'mysql') {
            $sql = "DELETE {repository_instances} FROM {repository_instances}\n                    LEFT JOIN {context} ON {context}.id = {repository_instances}.contextid\n                    WHERE {context}.id IS NULL";
        } else {
            $sql = "DELETE FROM {repository_instances}\n                    WHERE NOT EXISTS (\n                        SELECT 'x' FROM {context}\n                        WHERE {context}.id = {repository_instances}.contextid)";
        }
        $DB->execute($sql);
        // Main savepoint reached.
        upgrade_main_savepoint(true, 2013051401.01);
    }
    if ($oldversion < 2013051402.06) {
        // Fixing possible wrong MIME type for Java Network Launch Protocol (JNLP) files.
        $select = $DB->sql_like('filename', '?', false);
        $DB->set_field_select('files', 'mimetype', 'application/x-java-jnlp-file', $select, array('%.jnlp'));
        // Main savepoint reached.
        upgrade_main_savepoint(true, 2013051402.06);
    }
    if ($oldversion < 2013051402.1) {
        // Find all fileareas that have missing root folder entry and add the root folder entry.
        if (empty($CFG->filesrootrecordsfixed)) {
            upgrade_fix_missing_root_folders();
            // To skip running the same script on the upgrade to the next major release.
            set_config('filesrootrecordsfixed', 1);
        }
        // Main savepoint reached.
        upgrade_main_savepoint(true, 2013051402.1);
    }
    if ($oldversion < 2013051402.12) {
        // MDL-38228. Corrected course_modules upgrade script instead of 2013021801.01.
        // This upgrade script fixes the mismatches between DB fields course_modules.section
        // and course_sections.sequence. It makes sure that each module is included
        // in the sequence of only one section and that course_modules.section points back to it.
        // This script in included in each major version upgrade process so make sure we don't run it twice.
        if (empty($CFG->movingmoduleupgradescriptwasrun)) {
            upgrade_course_modules_sequences();
            // To skip running the same script on the upgrade to the next major release.
            set_config('movingmoduleupgradescriptwasrun', 1);
        }
        // Main savepoint reached.
        upgrade_main_savepoint(true, 2013051402.12);
    }
    if ($oldversion < 2013051403.02) {
        // Delete notes of deleted courses.
        $sql = "DELETE FROM {post}\n                 WHERE NOT EXISTS (SELECT {course}.id FROM {course}\n                                    WHERE {course}.id = {post}.courseid)\n                       AND {post}.module = ?";
        $DB->execute($sql, array('notes'));
        // Main savepoint reached.
        upgrade_main_savepoint(true, 2013051403.02);
    }
    if ($oldversion < 2013051403.09) {
        // Purge stored passwords from config_log table, ideally this should be in each plugin
        // but that would complicate backporting...
        $items = array('core/cronremotepassword', 'core/proxypassword', 'core/smtppass', 'core/jabberpassword', 'enrol_database/dbpass', 'enrol_ldap/bind_pw', 'url/secretphrase');
        foreach ($items as $item) {