function xmldb_tool_bloglevelupgrade_install()
{
    global $CFG, $OUTPUT;
    // this is a hack - admins were long ago instructed to upgrade blog levels,
    // the problem is that blog is not supposed to be course level activity!!
    if (!empty($CFG->bloglevel_upgrade_complete)) {
        // somebody already upgrades, we do not need this any more
        unset_config('bloglevel_upgrade_complete');
        return;
    }
    if (!isset($CFG->bloglevel)) {
        // fresh install?
        return;
    }
    if ($CFG->bloglevel == BLOG_COURSE_LEVEL || $CFG->bloglevel == BLOG_GROUP_LEVEL) {
        // inform admins that some settings require attention after upgrade
        $site = get_site();
        $a = new StdClass();
        $a->sitename = $site->fullname;
        $a->fixurl = "{$CFG->wwwroot}/{$CFG->admin}/tool/bloglevelupgrade/index.php";
        $subject = get_string('bloglevelupgrade', 'tool_bloglevelupgrade');
        $description = get_string('bloglevelupgradedescription', 'tool_bloglevelupgrade', $a);
        // can not use messaging here because it is not configured yet!
        upgrade_log(UPGRADE_LOG_NOTICE, null, $subject, $description);
        set_config('tool_bloglevelupgrade_pending', 1);
        echo $OUTPUT->notification($description);
    }
}

/**
 *
 * @global stdClass $CFG
 * @global stdClass $USER
 * @global moodle_database $DB
 * @global core_renderer $OUTPUT
 * @param int $oldversion
 * @return bool always true
 */
function xmldb_main_upgrade($oldversion)
{
    global $CFG, $USER, $DB, $OUTPUT;
    require_once $CFG->libdir . '/db/upgradelib.php';
    // Core Upgrade-related functions
    $dbman = $DB->get_manager();
    // loads ddl manager and xmldb classes
    ////////////////////////////////////////
    ///upgrade supported only from 1.9.x ///
    ////////////////////////////////////////
    if ($oldversion < 2008030600) {
        //NOTE: this table was added much later later in dev cycle, but we need it here, upgrades from pre PR1 not supported
        /// Define table upgrade_log to be created
        $table = new xmldb_table('upgrade_log');
        /// Adding fields to table upgrade_log
        $table->add_field('id', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED, XMLDB_NOTNULL, XMLDB_SEQUENCE, null);
        $table->add_field('type', XMLDB_TYPE_INTEGER, '10', null, XMLDB_NOTNULL, null, null);
        $table->add_field('plugin', XMLDB_TYPE_CHAR, '100', null, null, null, null);
        $table->add_field('version', XMLDB_TYPE_CHAR, '100', null, null, null, null);
        $table->add_field('targetversion', XMLDB_TYPE_CHAR, '100', null, null, null, null);
        $table->add_field('info', XMLDB_TYPE_CHAR, '255', null, XMLDB_NOTNULL, null, null);
        $table->add_field('details', XMLDB_TYPE_TEXT, 'small', null, null, null, null);
        $table->add_field('backtrace', XMLDB_TYPE_TEXT, 'small', null, null, null, null);
        $table->add_field('userid', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED, XMLDB_NOTNULL, null, null);
        $table->add_field('timemodified', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED, XMLDB_NOTNULL, null, null);
        /// Adding keys to table upgrade_log
        $table->add_key('primary', XMLDB_KEY_PRIMARY, array('id'));
        $table->add_key('userid', XMLDB_KEY_FOREIGN, array('userid'), 'user', array('id'));
        /// Adding indexes to table upgrade_log
        $table->add_index('timemodified', XMLDB_INDEX_NOTUNIQUE, array('timemodified'));
        $table->add_index('type-timemodified', XMLDB_INDEX_NOTUNIQUE, array('type', 'timemodified'));
        /// Create table for upgrade_log
        $dbman->create_table($table);
        /// Main savepoint reached
        upgrade_main_savepoint(true, 2008030600);
    }
    if ($oldversion < 2008030601) {
        //NOTE: this table was added much later later in dev cycle, but we need it here, upgrades from pre PR1 not supported
        /// Define table log_queries to be created
        $table = new xmldb_table('log_queries');
        /// Adding fields to table log_queries
        $table->add_field('id', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED, XMLDB_NOTNULL, XMLDB_SEQUENCE, null);
        $table->add_field('qtype', XMLDB_TYPE_INTEGER, '5', XMLDB_UNSIGNED, XMLDB_NOTNULL, null, null);
        $table->add_field('sqltext', XMLDB_TYPE_TEXT, 'medium', null, XMLDB_NOTNULL, null, null);
        $table->add_field('sqlparams', XMLDB_TYPE_TEXT, 'big', null, null, null, null);
        $table->add_field('error', XMLDB_TYPE_INTEGER, '5', XMLDB_UNSIGNED, XMLDB_NOTNULL, null, '0');
        $table->add_field('info', XMLDB_TYPE_TEXT, 'small', null, null, null, null);
        $table->add_field('backtrace', XMLDB_TYPE_TEXT, 'small', null, null, null, null);
        $table->add_field('exectime', XMLDB_TYPE_NUMBER, '10, 5', null, XMLDB_NOTNULL, null, null);
        $table->add_field('timelogged', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED, XMLDB_NOTNULL, null, null);
        /// Adding keys to table log_queries
        $table->add_key('primary', XMLDB_KEY_PRIMARY, array('id'));
        /// Conditionally launch create table for log_queries
        $dbman->create_table($table);
        /// Main savepoint reached
        upgrade_main_savepoint(true, 2008030601);
    }
    if ($oldversion < 2008030602) {
        @unlink($CFG->dataroot . '/cache/languages');
        if (file_exists("{$CFG->dataroot}/lang")) {
            // rename old lang directory so that the new and old langs do not mix
            if (rename("{$CFG->dataroot}/lang", "{$CFG->dataroot}/oldlang")) {
                $oldlang = "{$CFG->dataroot}/oldlang";
            } else {
                $oldlang = "{$CFG->dataroot}/lang";
            }
        } else {
            $oldlang = '';
        }
        // TODO: fetch previously installed languages ("*_utf8") found in $oldlang from moodle.org
        upgrade_set_timeout(60 * 20);
        // this may take a while
        // TODO: add some info file to $oldlang describing what to do with "$oldlang/*_utf8_local" dirs
        // Main savepoint reached
        upgrade_main_savepoint(true, 2008030602);
    }
    if ($oldversion < 2008030700) {
        upgrade_set_timeout(60 * 20);
        // this may take a while
        /// Define index contextid-lowerboundary (not unique) to be dropped form grade_letters
        $table = new xmldb_table('grade_letters');
        $index = new xmldb_index('contextid-lowerboundary', XMLDB_INDEX_NOTUNIQUE, array('contextid', 'lowerboundary'));
        /// Launch drop index contextid-lowerboundary
        if ($dbman->index_exists($table, $index)) {
            $dbman->drop_index($table, $index);
        }
        /// Define index contextid-lowerboundary-letter (unique) to be added to grade_letters
        $table = new xmldb_table('grade_letters');
        $index = new xmldb_index('contextid-lowerboundary-letter', XMLDB_INDEX_UNIQUE, array('contextid', 'lowerboundary', 'letter'));
        /// Launch add index contextid-lowerboundary-letter
        $dbman->add_index($table, $index);
//.........这里部分代码省略.........

/**
 * Default end upgrade callback
 * @param string $plugin
 * @param bool $installation true if installation, false means upgrade
 */
function print_upgrade_part_end($plugin, $installation, $verbose) {
    global $OUTPUT;
    upgrade_started();
    if ($installation) {
        if (empty($plugin) or $plugin == 'moodle') {
            upgrade_log(UPGRADE_LOG_NORMAL, $plugin, 'Core installed');
        } else {
            upgrade_log(UPGRADE_LOG_NORMAL, $plugin, 'Plugin installed');
        }
    } else {
        if (empty($plugin) or $plugin == 'moodle') {
            upgrade_log(UPGRADE_LOG_NORMAL, $plugin, 'Core upgraded');
        } else {
            upgrade_log(UPGRADE_LOG_NORMAL, $plugin, 'Plugin upgraded');
        }
    }
    if ($verbose) {
        echo $OUTPUT->notification(get_string('success'), 'notifysuccess');
        print_upgrade_separator();
    }
}

<?php

if (upgrade_ran('4.2.12')) {
    page_title('Upgrade 4.2.12 Already Applied');
    echo '<p><a href="' . site_prefix() . '/index/upgrade-app">Back</a></p>';
    return;
}
page_title('Applying Upgrade 4.2.12');
echo '<p><strong>Applying database updates...</strong></p>';
// database updates
if (upgrade_db(true)) {
    echo '<p>Done.</p>';
} else {
    echo '<p>Error: ' . db_error() . '</p>';
    return;
}
echo '<p><a href="' . site_prefix() . '/index/upgrade-app">Back</a></p>';
upgrade_log();

/**
 * Default end upgrade callback
 * @param string $plugin
 * @param bool $installation true if installation, false means upgrade
 */
function print_upgrade_part_end($plugin, $installation, $verbose)
{
    global $OUTPUT;
    upgrade_started();
    if ($installation) {
        if (empty($plugin) or $plugin == 'moodle') {
            upgrade_log(UPGRADE_LOG_NORMAL, $plugin, 'Core installed');
        } else {
            upgrade_log(UPGRADE_LOG_NORMAL, $plugin, 'Plugin installed');
        }
    } else {
        if (empty($plugin) or $plugin == 'moodle') {
            upgrade_log(UPGRADE_LOG_NORMAL, $plugin, 'Core upgraded');
        } else {
            upgrade_log(UPGRADE_LOG_NORMAL, $plugin, 'Plugin upgraded');
        }
    }
    if ($verbose) {
        $notification = new \core\output\notification(get_string('success'), \core\output\notification::NOTIFY_SUCCESS);
        $notification->set_show_closebutton(false);
        echo $OUTPUT->render($notification);
        print_upgrade_separator();
    }
}

/**
 * Internal function - do not use directly
 */
function upgrade_migrate_files_course($context, $path, $delete)
{
    global $CFG, $OUTPUT;
    $fullpathname = $CFG->dataroot . '/' . $context->instanceid . $path;
    if (!file_exists($fullpathname)) {
        return;
    }
    $items = new DirectoryIterator($fullpathname);
    $fs = get_file_storage();
    $textlib = textlib_get_instance();
    foreach ($items as $item) {
        if ($item->isDot()) {
            continue;
        }
        if ($item->isLink()) {
            // do not delete symbolic links or its children
            $delete_this = false;
        } else {
            $delete_this = $delete;
        }
        if (strpos($path, '/backupdata/') === 0) {
            $component = 'backup';
            $filearea = 'course';
            $filepath = substr($path, strlen('/backupdata'));
        } else {
            $component = 'course';
            $filearea = 'legacy';
            $filepath = $path;
        }
        if ($item->isFile()) {
            if (!$item->isReadable()) {
                $notification = "File not readable, skipping: " . $fullpathname . $item->getFilename();
                echo $OUTPUT->notification($notification);
                upgrade_log(UPGRADE_LOG_NOTICE, null, $notification);
                continue;
            }
            $filepath = clean_param($filepath, PARAM_PATH);
            $filename = clean_param($item->getFilename(), PARAM_FILE);
            if ($filename === '') {
                //unsupported chars, sorry
                continue;
            }
            if ($textlib->strlen($filepath) > 255) {
                // we need something unique and reproducible, sorry no shortening possible
                $filepath = '/directory_over_255_chars/' . md5($filepath) . '/';
                $oldfile = $fullpathname . $item->getFilename();
                $newfile = $filepath . $item->getFilename();
                $notification = "File path longer than 255 chars '{$oldfile}', file path truncated to '{$newfile}'";
                echo $OUTPUT->notification($notification);
                upgrade_log(UPGRADE_LOG_NOTICE, null, $notification);
            }
            if ($textlib->strlen($filename) > 255) {
                //try to shorten, but look for collisions
                $oldfile = $fullpathname . $item->getFilename();
                $parts = explode('.', $filename);
                $ext = array_pop($parts);
                $name = implode('.', $parts);
                $name = $textlib->substr($name, 0, 254 - $textlib->strlen($ext));
                $newfilename = $name . '.' . $ext;
                if (file_exists($fullpathname . $newfilename) or $fs->file_exists($context->id, $component, $filearea, '0', $filepath, $newfilename)) {
                    $filename = 'file_name_over_255_chars' . md5($filename) . $ext;
                    // bad luck, file with shortened name exists
                } else {
                    $filename = $newfilename;
                    // shortened name should not cause collisions
                }
                $notification = "File name longer than 255 chars '{$oldfile}', file name truncated to '{$filename}'";
                echo $OUTPUT->notification($notification);
                upgrade_log(UPGRADE_LOG_NOTICE, null, $notification);
            }
            if (!$fs->file_exists($context->id, $component, $filearea, '0', $filepath, $filename)) {
                $file_record = array('contextid' => $context->id, 'component' => $component, 'filearea' => $filearea, 'itemid' => 0, 'filepath' => $filepath, 'filename' => $filename, 'timecreated' => $item->getCTime(), 'timemodified' => $item->getMTime());
                if ($fs->create_file_from_pathname($file_record, $fullpathname . $item->getFilename())) {
                    if ($delete_this) {
                        @unlink($fullpathname . $item->getFilename());
                    }
                }
            }
        } else {
            if ($path == '/' and $item->getFilename() == 'moddata') {
                continue;
                // modules are responsible
            }
            $dirname = clean_param($item->getFilename(), PARAM_PATH);
            if ($dirname === '') {
                //unsupported chars, sorry
                continue;
            }
            $filepath = $filepath . $dirname . '/';
            if ($filepath !== '/backupdata/' and $textlib->strlen($filepath) <= 255) {
                $fs->create_directory($context->id, $component, $filearea, 0, $filepath);
            }
            //migrate recursively all subdirectories
            upgrade_migrate_files_course($context, $path . $item->getFilename() . '/', $delete_this);
            if ($delete_this) {
                // delete dir if empty
                @rmdir($fullpathname . $item->getFilename());
//.........这里部分代码省略.........

 /**
  * Adds and upgrades the selected plugins
  *
  * @param array $ingredients
  * @param string $path Path to the ingredient type file system
  * @param SimpleXMLElement $xml
  * @return array Problems during the ingredients deployment
  */
 public function deploy_ingredients($ingredients, $path, SimpleXMLElement $xml)
 {
     // Using the $ingredients array keys to maintain coherence with the main deployment method
     $problems = array();
     $pluginman = plugin_manager::instance();
     $plugintypespaths = get_plugin_types();
     $this->get_flavour_info($xml);
     foreach ($ingredients as $selection) {
         // [0] => ingredienttype, [1] => ingredientname
         $ingredientdata = explode('/', $selection);
         $type = $ingredientdata[0];
         $ingredient = $ingredientdata[1];
         if (empty($this->branches[$type]->branches[$ingredient])) {
             $problems[$selection]['pluginnotfound'] = $selection;
             continue;
         }
         $ingredientdata = $this->branches[$type]->branches[$ingredient];
         // Adapter to the restrictions array
         if (!empty($ingredientdata->restrictions)) {
             $problems[$selection] = $ingredientdata->restrictions;
             continue;
         }
         if (empty($xml->{$type}) || empty($xml->{$type}->{$ingredient})) {
             $problems[$selection]['pluginnotfound'] = $selection;
             continue;
         }
         // Deploy then
         $ingredientpath = $plugintypespaths[$type] . '/' . $ingredient;
         // Remove old dir if present
         if (file_exists($ingredientpath)) {
             // Report if the old plugin directory can't be removed
             if (!$this->unlink($ingredientpath)) {
                 $problems[$selection]['plugincantremove'] = $selection;
                 continue;
             }
         }
         // Copy the new contents where the flavour says
         $tmppath = $path . '/' . $xml->{$type}->{$ingredient}->path;
         if (!$this->copy($tmppath, $ingredientpath)) {
             debugging('From : ' . $tmppath . ' To: ' . $ingredientpath);
             $problems[$selection]['plugincopyerror'] = $selection;
         }
     }
     // Execute the moodle upgrade process
     try {
         foreach ($plugintypespaths as $type => $location) {
             upgrade_plugins($type, 'flavours_print_upgrade_void', 'flavours_print_upgrade_void', false);
         }
     } catch (Exception $ex) {
         abort_all_db_transactions();
         $info = get_exception_info($ex);
         upgrade_log(UPGRADE_LOG_ERROR, $ex->module, 'Exception: ' . get_class($ex), $info->message, $info->backtrace);
     }
     return $problems;
 }

/**
 * Default end upgrade callback
 * @param string $plugin
 * @param bool $installation true if installation, false menas upgrade
 */
function print_upgrade_part_end($plugin, $installation)
{
    upgrade_started();
    if ($installation) {
        if (empty($plugin) or $plugin == 'moodle') {
            upgrade_log(UPGRADE_LOG_NORMAL, $plugin, 'Core installed');
        } else {
            upgrade_log(UPGRADE_LOG_NORMAL, $plugin, 'Plugin installed');
        }
    } else {
        if (empty($plugin) or $plugin == 'moodle') {
            upgrade_log(UPGRADE_LOG_NORMAL, $plugin, 'Core upgraded');
        } else {
            upgrade_log(UPGRADE_LOG_NORMAL, $plugin, 'Plugin upgraded');
        }
    }
    notify(get_string('success'), 'notifysuccess');
    print_upgrade_separator();
}

function xmldb_resource_upgrade($oldversion)
{
    global $CFG, $DB;
    require_once "{$CFG->dirroot}/mod/resource/db/upgradelib.php";
    $dbman = $DB->get_manager();
    //===== 1.9.0 upgrade line ======//
    if ($oldversion < 2009041900) {
        resource_20_prepare_migration();
        // resource savepoint reached
        upgrade_mod_savepoint(true, 2009041900, 'resource');
    }
    if ($oldversion < 2009042000) {
        // Rename field summary on table resource to intro
        $table = new xmldb_table('resource');
        $field = new xmldb_field('summary', XMLDB_TYPE_TEXT, 'small', null, null, null, null, 'reference');
        // Launch rename field summary
        $dbman->rename_field($table, $field, 'intro');
        // resource savepoint reached
        upgrade_mod_savepoint(true, 2009042000, 'resource');
    }
    if ($oldversion < 2009042001) {
        // Define field introformat to be added to resource
        $table = new xmldb_table('resource');
        $field = new xmldb_field('introformat', XMLDB_TYPE_INTEGER, '4', XMLDB_UNSIGNED, XMLDB_NOTNULL, null, '0', 'intro');
        // Launch add field introformat
        if (!$dbman->field_exists($table, $field)) {
            $dbman->add_field($table, $field);
        }
        // conditionally migrate to html format in intro
        if ($CFG->texteditors !== 'textarea') {
            $rs = $DB->get_recordset('resource', array('introformat' => FORMAT_MOODLE), '', 'id,intro,introformat');
            foreach ($rs as $r) {
                $r->intro = text_to_html($r->intro, false, false, true);
                $r->introformat = FORMAT_HTML;
                $DB->update_record('resource', $r);
                upgrade_set_timeout();
            }
            $rs->close();
        }
        // resource savepoint reached
        upgrade_mod_savepoint(true, 2009042001, 'resource');
    }
    if ($oldversion < 2009062600) {
        $res_count = $DB->count_records('resource');
        $old_count = $DB->count_records('resource_old', array('migrated' => 0));
        if ($res_count != $old_count) {
            //we can not continue, something is very wrong!!
            upgrade_log(UPGRADE_LOG_ERROR, null, 'Resource migration failed.');
            upgrade_mod_savepoint(false, 2009062600, 'resource');
        }
        // Drop obsoleted fields from resource table
        $table = new xmldb_table('resource');
        $fields = array('type', 'reference', 'alltext', 'popup', 'options');
        foreach ($fields as $fname) {
            $field = new xmldb_field($fname);
            $dbman->drop_field($table, $field);
        }
        // resource savepoint reached
        upgrade_mod_savepoint(true, 2009062600, 'resource');
    }
    if ($oldversion < 2009062601) {
        $table = new xmldb_table('resource');
        // Define field tobemigrated to be added to resource
        $field = new xmldb_field('tobemigrated', XMLDB_TYPE_INTEGER, '4', XMLDB_UNSIGNED, XMLDB_NOTNULL, null, '0', 'introformat');
        // Conditionally launch add field tobemigrated
        if (!$dbman->field_exists($table, $field)) {
            $dbman->add_field($table, $field);
        }
        // Define field mainfile to be added to resource
        $field = new xmldb_field('mainfile', XMLDB_TYPE_CHAR, '255', null, null, null, null, 'tobemigrated');
        // Conditionally launch add field mainfile
        if (!$dbman->field_exists($table, $field)) {
            $dbman->add_field($table, $field);
        }
        // Define field legacyfiles to be added to resource
        $field = new xmldb_field('legacyfiles', XMLDB_TYPE_INTEGER, '4', XMLDB_UNSIGNED, XMLDB_NOTNULL, null, '0', 'mainfile');
        // Conditionally launch add field legacyfiles
        if (!$dbman->field_exists($table, $field)) {
            $dbman->add_field($table, $field);
        }
        // Define field legacyfileslast to be added to resource
        $field = new xmldb_field('legacyfileslast', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED, null, null, null, 'legacyfiles');
        // Conditionally launch add field legacyfileslast
        if (!$dbman->field_exists($table, $field)) {
            $dbman->add_field($table, $field);
        }
        // Define field display to be added to resource
        $field = new xmldb_field('display', XMLDB_TYPE_INTEGER, '4', XMLDB_UNSIGNED, XMLDB_NOTNULL, null, '0', 'legacyfileslast');
        // Conditionally launch add field display
        if (!$dbman->field_exists($table, $field)) {
            $dbman->add_field($table, $field);
        }
        // Define field displayoptions to be added to resource
        $field = new xmldb_field('displayoptions', XMLDB_TYPE_TEXT, 'small', null, null, null, null, 'display');
        // Conditionally launch add field displayoptions
        if (!$dbman->field_exists($table, $field)) {
            $dbman->add_field($table, $field);
        }
        // Define field filterfiles to be added to resource
        $field = new xmldb_field('filterfiles', XMLDB_TYPE_INTEGER, '4', XMLDB_UNSIGNED, XMLDB_NOTNULL, null, '0', 'displayoptions');
//.........这里部分代码省略.........

/**
 * Resource module upgrade code
 *
 * This file keeps track of upgrades to
 * the resource 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 installtion 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.
 *
 * @package   mod-resource
 * @copyright 2009 Petr Skoda (http://skodak.org)
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
function xmldb_resource_upgrade($oldversion)
{
    global $CFG, $DB;
    require_once "{$CFG->dirroot}/mod/resource/db/upgradelib.php";
    $dbman = $DB->get_manager();
    $result = true;
    //===== 1.9.0 upgrade line ======//
    if ($result && $oldversion < 2009042000) {
        // Rename field summary on table resource to intro
        $table = new xmldb_table('resource');
        $field = new xmldb_field('summary', XMLDB_TYPE_TEXT, 'small', null, null, null, null, 'reference');
        // Launch rename field summary
        $dbman->rename_field($table, $field, 'intro');
        // resource savepoint reached
        upgrade_mod_savepoint($result, 2009042000, 'resource');
    }
    if ($result && $oldversion < 2009042001) {
        // Define field introformat to be added to resource
        $table = new xmldb_table('resource');
        $field = new xmldb_field('introformat', XMLDB_TYPE_INTEGER, '4', XMLDB_UNSIGNED, XMLDB_NOTNULL, null, '0', 'intro');
        // Launch add field introformat
        $dbman->add_field($table, $field);
        // set format to current
        $DB->set_field('resource', 'introformat', FORMAT_MOODLE, array());
        // resource savepoint reached
        upgrade_mod_savepoint($result, 2009042001, 'resource');
    }
    if ($result && $oldversion < 2009062500) {
        // fix log actions
        update_log_display_entry('resource', 'view all', 'resource', 'name');
        // resource savepoint reached
        upgrade_mod_savepoint($result, 2009062500, 'resource');
    }
    if ($result && $oldversion < 2009062501) {
        resource_20_prepare_migration();
        // resource savepoint reached
        upgrade_mod_savepoint($result, 2009062501, 'resource');
    }
    if ($result && $oldversion < 2009062600) {
        $res_count = $DB->count_records('resource');
        $old_count = $DB->count_records('resource_old', array('migrated' => 0));
        if ($res_count != $old_count) {
            //we can not continue, something is very wrong!!
            upgrade_log(UPGRADE_LOG_ERROR, null, 'Resource migration failed.');
            upgrade_mod_savepoint(false, 2009062600, 'resource');
        }
        // Drop obsoleted fields from resource table
        $table = new xmldb_table('resource');
        $fields = array('type', 'reference', 'alltext', 'popup', 'options');
        foreach ($fields as $fname) {
            $field = new xmldb_field($fname);
            $dbman->drop_field($table, $field);
        }
        // resource savepoint reached
        upgrade_mod_savepoint($result, 2009062600, 'resource');
    }
    if ($result && $oldversion < 2009062601) {
        $table = new xmldb_table('resource');
        // Define field tobemigrated to be added to resource
        $field = new xmldb_field('tobemigrated', XMLDB_TYPE_INTEGER, '4', XMLDB_UNSIGNED, XMLDB_NOTNULL, null, '0', 'introformat');
        // Conditionally launch add field tobemigrated
        if (!$dbman->field_exists($table, $field)) {
            $dbman->add_field($table, $field);
        }
        // Define field mainfile to be added to resource
        $field = new xmldb_field('mainfile', XMLDB_TYPE_CHAR, '255', null, null, null, null, 'tobemigrated');
        // Conditionally launch add field mainfile
        if (!$dbman->field_exists($table, $field)) {
            $dbman->add_field($table, $field);
        }
        // Define field legacyfiles to be added to resource
        $field = new xmldb_field('legacyfiles', XMLDB_TYPE_INTEGER, '4', XMLDB_UNSIGNED, XMLDB_NOTNULL, null, '0', 'mainfile');
        // Conditionally launch add field legacyfiles
//.........这里部分代码省略.........

//.........这里部分代码省略.........
        upgrade_mod_savepoint(true, 2009121800, 'workshop');
    }

    /**
     * Add 'evaluation' field into workshop
     */
    if ($oldversion < 2010070700) {
        $table = new xmldb_table('workshop');
        $field = new xmldb_field('evaluation', XMLDB_TYPE_CHAR, '30', null, XMLDB_NOTNULL, null, null, 'strategy');
        if (!$dbman->field_exists($table, $field)) {
            $dbman->add_field($table, $field);
        }
        upgrade_mod_savepoint(true, 2010070700, 'workshop');
    }

    /**
     * Set the value of the new 'evaluation' field to 'best', there is no alternative at the moment
     */
    if ($oldversion < 2010070701) {
        $DB->set_field('workshop', 'evaluation', 'best');
        upgrade_mod_savepoint(true, 2010070701, 'workshop');
    }

    /**
     * Add 'late' field into workshop_submissions
     */
    if ($oldversion < 2010072300) {
        $table = new xmldb_table('workshop_submissions');
        $field = new xmldb_field('late', XMLDB_TYPE_INTEGER, '2', XMLDB_UNSIGNED, XMLDB_NOTNULL, null, '0', 'published');
        if (!$dbman->field_exists($table, $field)) {
            $dbman->add_field($table, $field);
        }
        upgrade_mod_savepoint(true, 2010072300, 'workshop');
    }

    /**
     * Create legacy _old tables to sync install.xml and real database
     *
     * In most cases these tables already exists because they were created during 1.9->2.0 migration
     * This step is just for those site that were installed from vanilla 2.0 and these _old tables
     * were not created.
     * Note that these tables will be dropped again later in 2.x
     */
    if ($oldversion < 2010111200) {
        foreach (array('workshop', 'workshop_elements', 'workshop_rubrics', 'workshop_submissions', 'workshop_assessments',
                'workshop_grades', 'workshop_comments', 'workshop_stockcomments') as $tableorig) {
            $tablearchive = $tableorig . '_old';
            if (!$dbman->table_exists($tablearchive)) {
                $dbman->install_one_table_from_xmldb_file($CFG->dirroot.'/mod/workshop/db/install.xml', $tablearchive);
            }
        }
        upgrade_mod_savepoint(true, 2010111200, 'workshop');
    }

    /**
     * Check the course_module integrity - see MDL-26312 for details
     *
     * Because of a bug in Workshop upgrade code, multiple workshop course_modules can
     * potentially point to a single workshop instance. The chance is pretty low as in most cases,
     * the upgrade failed. But under certain circumstances, workshop could be upgraded with
     * this data integrity issue. We want to detect it now and let the admin know.
     */
    if ($oldversion < 2011021100) {
        $sql = "SELECT cm.id, cm.course, cm.instance
                  FROM {course_modules} cm
                 WHERE cm.module IN (SELECT id
                                       FROM {modules}
                                      WHERE name = ?)";
        $rs = $DB->get_recordset_sql($sql, array('workshop'));
        $map = array(); // returned stdClasses by instance id
        foreach ($rs as $cm) {
            $map[$cm->instance][$cm->id] = $cm;
        }
        $rs->close();

        $problems = array();
        foreach ($map as $instanceid => $cms) {
            if (count($cms) > 1) {
                $problems[] = 'workshop instance ' . $instanceid . ' referenced by course_modules ' . implode(', ', array_keys($cms));
            }
        }
        if ($problems) {
            echo $OUTPUT->notification('¡Ay, caramba! Data integrity corruption has been detected in your workshop ' . PHP_EOL .
                'module database tables. This might be caused by a bug in workshop upgrade code. ' . PHP_EOL .
                'Please report this issue immediately in workshop module support forum at ' . PHP_EOL .
                'http://moodle.org so that we can help to fix this problem. Please copy and keep ' . PHP_EOL .
                'following information for future reference:');
            foreach ($problems as $problem) {
                echo $OUTPUT->notification($problem);
                upgrade_log(UPGRADE_LOG_NOTICE, 'mod_workshop', 'course_modules integrity problem', $problem);
            }
        }

        unset($problems);
        unset($map);
        upgrade_mod_savepoint(true, 2011021100, 'workshop');
    }

    return true;
}

/**
 * Default exception handler, uncought exceptions are equivalent to using print_error()
 *
 * @param Exception $ex 
 * @param boolean $isupgrade 
 * @param string $plugin 
 * Does not return. Terminates execution.
 */
function default_exception_handler($ex, $isupgrade = false, $plugin = null)
{
    global $CFG, $DB, $OUTPUT, $SCRIPT;
    // detect active db transactions, rollback and log as error
    if ($DB && $DB->is_transaction_started()) {
        error_log('Database transaction aborted by exception in ' . $CFG->dirroot . $SCRIPT);
        try {
            // note: transaction blocks should never change current $_SESSION
            $DB->rollback_sql();
        } catch (Exception $ignored) {
        }
    }
    $backtrace = $ex->getTrace();
    $place = array('file' => $ex->getFile(), 'line' => $ex->getLine(), 'exception' => get_class($ex));
    array_unshift($backtrace, $place);
    if ($ex instanceof moodle_exception) {
        $errorcode = $ex->errorcode;
        $module = $ex->module;
        $a = $ex->a;
        $link = $ex->link;
        $debuginfo = $ex->debuginfo;
    } else {
        $errorcode = 'generalexceptionmessage';
        $module = 'error';
        $a = $ex->getMessage();
        $link = '';
        $debuginfo = null;
    }
    list($message, $moreinfourl, $link) = prepare_error_message($errorcode, $module, $link, $a);
    if ($isupgrade) {
        // First log upgrade error
        upgrade_log(UPGRADE_LOG_ERROR, $plugin, 'Exception: ' . get_class($ex), $message, $backtrace);
        // Always turn on debugging - admins need to know what is going on
        $CFG->debug = DEBUG_DEVELOPER;
    }
    if (is_stacktrace_during_output_init($backtrace)) {
        echo bootstrap_renderer::early_error($message, $moreinfourl, $link, $backtrace, $debuginfo);
    } else {
        echo $OUTPUT->fatal_error($message, $moreinfourl, $link, $backtrace, $debuginfo);
    }
    exit(1);
    // General error code
}