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+<?php // $Id: upgrade.php,v 1.1 2008/07/24 01:48:12 arborrow Exp $
+
+// This file keeps track of upgrades to
+// the algebra qtype plugin
+//
+// 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 functions defined in lib/ddllib.php
+
+function xmldb_qtype_algebra_upgrade($oldversion=0) {
+
+ global $CFG, $THEME, $DB;
+
+ $dbman = $DB->get_manager();
+
+/// And upgrade begins here. For each one, you'll need one
+/// block of code similar to the next one. Please, delete
+/// this comment lines once this file start handling proper
+/// upgrade code.
+
+ // Add the field to store the string which is placed in front of the answer
+ // box when the question is displayed
+ if ($oldversion < 2008061500) {
+ $table = new xmldb_table('question_algebra');
+ $field = new xmldb_field('answerprefix', XMLDB_TYPE_TEXT, 'small', null, XMLDB_NOTNULL, null, '', 'allowedfuncs');
+ if (!$dbman->field_exists($table, $field)) {
+ $dbman->add_field($table, $field);
+ }
+ upgrade_plugin_savepoint(true, 2008061500, 'qtype', 'algebra');
+ }
+
+ // Drop the answers and variables fields wich are totaly redundants
+ if ($oldversion < 2011072800) {
+ $table = new xmldb_table('question_algebra');
+ $field = new xmldb_field('answers');
+
+ if ($dbman->field_exists($table, $field)) {
+ $dbman->drop_field($table, $field);
+ }
+ $field = new xmldb_field('variables');
+
+ if ($dbman->field_exists($table, $field)) {
+ $dbman->drop_field($table, $field);
+ }
+ upgrade_plugin_savepoint(true, 2011072800, 'qtype', 'algebra');
+ }
+ return true;
+}
+