upgradeitems.inc.php.svn-base

PHP 知识管理系统（基于树结构的知识管理系统）, 英文原版的PHP源码。

<?php
/**
 * $Id$
 *
 * KnowledgeTree Community Edition
 * Document Management Made Simple
 * Copyright (C) 2008 KnowledgeTree Inc.
 * Portions copyright The Jam Warehouse Software (Pty) Limited
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License version 3 as published by the
 * Free Software Foundation.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * You can contact KnowledgeTree Inc., PO Box 7775 #87847, San Francisco,
 * California 94120-7775, or email [e-mail].
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU General Public License version 3.
 *
 * In accordance with Section 7(b) of the GNU General Public License version 3,
 * these Appropriate Legal Notices must retain the display of the "Powered by
 * KnowledgeTree" logo and retain the original copyright notice. If the display of the
 * logo is not reasonably feasible for technical reasons, the Appropriate Legal Notices
 * must display the words "Powered by KnowledgeTree" and retain the original
 * copyright notice.
 * Contributor( s): ______________________________________
 *
 */

// {{{ Format of the descriptor
/**
 * Format of the descriptor
 *
 * type*version*phase*simple description for uniqueness
 *
 * type is: sql, function, subupgrade, upgrade
 * version is: 1.2.4, 2.0.0rc5
 * phase is: 0, 1, 0pre.  Phase is _only_ evaluated by describeUpgrades.
 * description is: anything, unique in terms of version and type.
 */
// }}}

require_once(KT_LIB_DIR . '/upgrades/UpgradeFunctions.inc.php');
require_once(KT_LIB_DIR . '/database/sqlfile.inc.php');
require_once(KT_LIB_DIR . '/database/datetime.inc');

// {{{ Upgrade_Already_Applied
class Upgrade_Already_Applied extends PEAR_Error {
    function Upgrade_Already_Applied($oUpgradeItem) {
        $this->oUpgradeItem = $oUpgradeItem;
    }
}
// }}}

class UpgradeItem {
    var $type = "";
    var $name;
    var $version;
    var $description;
    var $phase;
    var $priority = 0;
    var $parent;
    var $date;
    var $result;

    function UpgradeItem($name, $version, $description = null, $phase = 0, $priority = 0) {
        $this->name = $name;
        $this->version = $version;
        if (is_null($description)) {
            $description = $this->type . " upgrade to version " .  $version . " phase " . $phase;
        }
        $this->description = $description;
        $this->phase = $phase;
        $this->priority = $priority;
    }

    function setParent($parent) {
        $this->parent = $parent;
    }
    function setDate($date) {
        $this->date = $date;
    }

    function getDescriptor() {
        return join("*", array($this->type, $this->version, $this->phase, $this->name));
    }

    function getDescription() {
        return $this->description;
    }

    function getVersion() {
        return $this->version;
    }

    function getPhase() {
        return $this->phase;
    }

    function getPriority() {
        return $this->priority;
    }

    function getType() {
        return $this->type;
    }

    function _upgradeTableInstalled() {
        $query = "SELECT COUNT(id) FROM upgrades";
        $res = DBUtil::getOneResult($query);
        if (PEAR::isError($res)) {
            return false;
        }
        return true;
    }

    function isAlreadyApplied() {
        if (!$this->_upgradeTableInstalled()) {
            return false;
        }
        $query = "SELECT id FROM upgrades WHERE descriptor = ? AND result = ?";
        $params = array($this->getDescriptor(), true);
        $res = DBUtil::getOneResultKey(array($query, $params), 'id');
        if (PEAR::isError($res)) {
            return $res;
        }
        if (is_null($res)) {
            return false;
        }
        return true;
    }

    function performUpgrade($force = false) {
        $res = $this->isAlreadyApplied();
        if ($res === true) {
            if ($force !== true) {
                // PHP5: Exception
                return new Upgrade_Already_Applied($this);
            }
        }
        if (PEAR::isError($res)) {
            return $res;
        }
        $oCache =& KTCache::getSingleton();
        $save = $oCache->bEnabled;
        $oCache->bEnabled = false;
        $res = $this->_performUpgrade();
        $oCache->bEnabled = $save;
        if (PEAR::isError($res)) {
            $this->_recordUpgrade(false);
            return $res;
        }
        $res = $this->_recordUpgrade(true);
        if (PEAR::isError($res)) {
            return $res;
        }
        return true;
    }

    function _performUpgrade() {
        return PEAR::raiseError("Unimplemented");
    }

    function _recordUpgrade($result) {
        if (is_null($this->date)) {
            $this->date = getCurrentDateTime();
        }
        if ($this->parent) {
            $parentid = $this->parent->getDescriptor();
        } else {
            $parentid = null;
        }
        return DBUtil::autoInsert("upgrades", array(
            "descriptor" => $this->getDescriptor(),
            "description" => $this->description,
            "date_performed" => $this->date,
            "result" => $result,
            "parent" => $parentid,
        ));
    }

    // STATIC
    function getAllUpgrades() {
        return array();
    }
}

class SQLUpgradeItem extends UpgradeItem {
    function SQLUpgradeItem($path, $version = null, $description = null, $phase = null, $priority = null) {
        $this->type = "sql";
        $this->priority = 0;
        $details = $this->_getDetailsFromFileName($path);
        if (is_null($version)) {
            $version = $details[1];
        }
        if (is_null($description)) {
            $description = $details[2];
        }
        if (is_null($phase)) {
            $phase = $details[3];
        }
        if (is_null($priority)) {
            $priority = isset($details[4]) ? $details[4] : 0;
        }
        $this->UpgradeItem($path, $version, $description, $phase, $priority);
    }

    /**
     * Describe the SQL scripts that will be used to upgrade KnowledgeTree
     *
     * Return an array of arrays with two components: a string identifier
     * that uniquely describes the step to be taken and a string which is an
     * HTML-formatted description of the step to be taken.  These will be
     * returned in any order - describeUpgrade performs the ordering.
     *
     * @param string Original version (e.g., "1.2.4")
     * @param string Current version (e.g., "2.0.2")
     *
     * @return array Array of SQLUpgradeItem describing steps to be taken
     *
     * STATIC
     */
    function getUpgrades($origVersion, $currVersion) {
        global $default;
        $sqlupgradedir = KT_DIR . '/sql/' . $default->dbType . '/upgrade/';

        $ret = array();

        if (!is_dir($sqlupgradedir)) {
            return PEAR::raiseError("SQL Upgrade directory ($sqlupgradedir) not accessible");
        }
        if (!($dh = opendir($sqlupgradedir))) {
            return PEAR::raiseError("SQL Upgrade directory ($sqlupgradedir) not accessible");
        }

        while (($file = readdir($dh)) !== false) {
            // Each entry can be a file or a directory
            //
            // A file is legacy before the upgrade system was created, but
            // will be supported anyway.
            //
            // A directory is the end-result version: so, 2.0.5 contains
            // every script that differentiates it from a previous version,
            // say, 2.0.5rc1 or 2.0.4.
            //