//.........这里部分代码省略.........
            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');
            }
            if (get_config('core', 'thememobile') === 'mymobile') {
                set_config('thememobile', 'clean');
            }
            if (get_config('core', 'themelegacy') === 'mymobile') {
                set_config('themelegacy', 'clean');
            }
            if (get_config('core', 'themetablet') === 'mymobile') {
                set_config('themetablet', 'clean');
            }
            // Hacky emulation of plugin uninstallation.
            unset_all_config_for_plugin('theme_mymobile');
        }
        // Main savepoint reached.
        upgrade_main_savepoint(true, 2013110600.01);
    }

//.........这里部分代码省略.........
        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 $item) {
            list($plugin, $name) = explode('/', $item);
            $sqlcomparevalue = $DB->sql_compare_text('value');
            $sqlcompareoldvalue = $DB->sql_compare_text('oldvalue');
            if ($plugin === 'core') {
                $sql = "UPDATE {config_log}\n                           SET value = :value\n                         WHERE name = :name AND plugin IS NULL AND {$sqlcomparevalue} <> :empty";
                $params = array('value' => '********', 'name' => $name, 'empty' => '');
                $DB->execute($sql, $params);
                $sql = "UPDATE {config_log}\n                           SET oldvalue = :value\n                         WHERE name = :name AND plugin IS NULL AND {$sqlcompareoldvalue} <> :empty";
                $params = array('value' => '********', 'name' => $name, 'empty' => '');
                $DB->execute($sql, $params);
            } else {
                $sql = "UPDATE {config_log}\n                           SET value = :value\n                         WHERE name = :name AND plugin = :plugin AND {$sqlcomparevalue} <> :empty";
                $params = array('value' => '********', 'name' => $name, 'plugin' => $plugin, 'empty' => '');
                $DB->execute($sql, $params);