stack-cvs

[Simon H. <sim...@us...>]

Update of /cvsroot/stack/stack-dev/install/update/updates
In directory sfp-cvsdas-3.v30.ch3.sourceforge.com:/tmp/cvs-serv28759/install/update/updates

Added Files:
      Tag: STACK2_2
	TwoPointTwo.php 
Log Message:
Update script extended for STACK 2.2

--- NEW FILE: TwoPointTwo.php ---
<?php
/**
*
* Welcome to STACK.  A system for teaching and assessment using a
* computer algebra kernel.
*
* This file is licensed under the GPL License.
*
* A copy of the license is in your STACK distribution called
* license.txt.  If you are missing this file you can obtain
* it from:
* http://www.stack.bham.ac.uk/license.txt
*
* @package stackUpdate
* @author Simon Hammond
*
*/
/**
* Updates stack alpha to 2.2.
*/
global $config;
$root = $config->get('docroot');
require_once($root.'/lib/error.php');
require_once($root.'/lib/items/Item.php');
require_once($root.'/lib/items/QuestionPart.php');
require_once($root.'/lib/database/StackDBItem.php');
require_once($root.'/other/adodb5/adodb.inc.php');
require_once($root.'/lib/database/StackDBADOdb.php');

class TwoPointTwo{

    private $errorLog;

    public function __construct(&$errorLog)
    {
        $this->errorLog = $errorLog;
    }

    /**
    * Updates the database
    */
    public function performUpdate()
    {
	    // Add the new 'question_lines' table
	    // below from adodbinit.php - expecting to be safer than simple mySQL query:
	    $db = NewADOConnection($config->getDB('dbType'));
	    // Maybe this should be PConnect
	    $db->Connect($config->getDB('host'), $config->getDB('user'), $config->getDB('password'), $config->getDB('database'));

	    $dict = NewDataDictionary($db);
		// Table structure for table `question_lines`
	    $fields =
		    'id I(11) UNSIGNED NOTNULL AUTO PRIMARY,
			latestVersion I(11) UNSIGNED,
		    modified T NOTNULL DEFTIMESTAMP ON UPDATE '.$db->sysTimeStamp;
	    $sqlarray = $dict->CreateTableSQL("question_lines", $fields, "");
	    if(!$dict->ExecuteSQLArray($sqlarray))
	    {
	    	$toReturn = $dict->ErrorMsg().'<br /><br />';
	    }

	    // Add 'line' column in stackquestions
		$conn = new StackDBADOdb();
		$conn->connect();
		// hoping this is a platform-agnostic way to modify tables - more knowlegable opinions welcome!
		$conn->query('ALTER TABLE stackquestion ADD COLUMN line I(11) UNSIGNED');

	    // Create new line for each question, i.e. create row in question_lines and set line with that id.
	    $conn->query('SELECT questionID FROM stackquestion');
	    for($i = 0; $i < $conn->noRows(); $i++) {

	    	//insert line for each question
	    	$id = $conn->result($i, 'questionID');
	    	$conn->query("INSERT INTO question_lines(latestVersion) VALUES($id)");
	    	// shortcut: we know sequence of insert ids will be 1,2,3,... i.e. $i
	    	// set line id in each question
	    	$conn->query("UPDATE stackquestion SET line=$i WHERE questionID=$id");
	    }

	    return true;
    }
}