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+<?php
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+/* For licensing terms, see /license.txt */
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+/**
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+ * Fix a very weird case where the following queries seem to have been executed
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+ * twice during a database migration from 1.9 to 1.10
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+ * UPDATE c_item_property cip SET cip.to_group_id = (SELECT cgi.iid FROM c_group_info cgi WHERE cgi.c_id = cip.c_id AND cgi.id = cip.to_group_id);
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+ * DELETE FROM c_item_property WHERE to_group_id IS NOT NULL AND to_group_id <> 0 AND to_group_id NOT IN (SELECT iid FROM c_group_info);
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+ * These queries, as explained in BT#13243, when executed twice, break the
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+ * relationship of events to groups, and maybe other group resources, and then
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+ * deletes them.
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+ *
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+ * To fix, we need access to the previous database (version 1.9) and an active
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+ * connection to the migrated database (version 1.11 in this case). The script
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+ * scans through events in the old database, checks if they still exist in the
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+ * c_item_property in the new database, and if they don't tries to recreate the
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+ * c_item_property records needed to recover them.
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+ *
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+ * Due to the active use of the v1.11 configuration file through global.inc.php,
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+ * settings for the old database have to be added manually.
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+ */
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+/**
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+ * Context initialization
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+ */
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+if (PHP_SAPI != 'cli') {
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+ die('This script can only be executed from the command line');
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+}
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+require __DIR__.'/../../main/inc/global.inc.php';
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+
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+/**
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+ * Old database configuration
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+ */
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+$oldDBHost = 'localhost';
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+$oldDBName = 'carmelitas19';
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+$oldDBUser = 'carmelitas19';
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+$oldDBPass = 'carmelitas19';
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+try {
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+ $oldDBH = new PDO('mysql:host=localhost;dbname='.$oldDBName, $oldDBUser, $oldDBPass);
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+} catch (PDOException $e) {
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+ echo "Error connecting to old database: ".$e->getMessage().PHP_EOL;
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+}
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+
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+/**
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+ * New database configuration
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+ */
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+$newDBHost = 'localhost';
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+$newDBName = 'carmelitas11';
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+$newDBUser = 'carmelitas11';
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+$newDBPass = 'carmelitas11';
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+try {
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+ $newDBH = new PDO('mysql:host=localhost;dbname='.$newDBName, $newDBUser, $newDBPass);
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+} catch (PDOException $e) {
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+ echo "Error connecting to new database: ".$e->getMessage().PHP_EOL;
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+}
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+
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+/**
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+ * Start looking for group events
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+ */
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+$foundCount = 0;
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+$totalCount = 0;
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+// Get a list of groups by course (TODO add sessions support)
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+$groups = getOldGroupsByCourse();
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+
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+// Set this optional filter to something else than empty if you want to only
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+// check items of one course
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+$optionalCourseFilter = '11';
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+$sqlOld = "SELECT * FROM c_item_property WHERE to_group_id IS NOT NULL AND to_group_id != 0";
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+if (!empty($optionalCourseFilter)) {
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+ $sqlOld .= ' AND c_id = '.$optionalCourseFilter;
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+}
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+foreach ($oldDBH->query($sqlOld) as $oldRow) {
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+ echo $oldRow['c_id'].' '.$oldRow['id'].' '.$oldRow['tool'].' '.$oldRow['ref'].' '.$oldRow['to_group_id'].PHP_EOL;
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+ $totalCount++;
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+
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+ $sessionSubSelect = '';
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+ $sessionInsert = '';
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+ if (!empty($oldRow['id_session'])) {
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+ $sessionSubSelect = ' AND session_id = "'.$oldRow['id_session'].'" ';
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+ $sessionInsert = $oldRow['id_session'];
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+ } else {
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+ $sessionSubSelect = ' AND session_id IS NULL ';
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+ $sessionInsert = 'NULL';
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+ }
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+ $sqlNew = "SELECT iid, to_group_id FROM c_item_property
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+ WHERE c_id = ".$oldRow['c_id'].
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+ $sessionSubSelect.
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+ " AND tool = '".$oldRow['tool']."'
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+ AND ref = ".$oldRow['ref'];
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+
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+ //echo trim(str_replace("\n", '', $sqlNew)).PHP_EOL;
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+ $q = $newDBH->query($sqlNew);
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+ // Two situations arise: the record is found and is pointing to the wrong group -> update
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+ // or the record is not found and we need to create it based on the new iid of the old group's id -> insert
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+ if ($q->rowCount() > 0) {
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+ $newRow = $q->fetch();
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+ //echo "--> Found corresponding c_item_property as ".$newRow['iid'].PHP_EOL;
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+ $foundCount++;
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+
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+ // First check if the group referenced in the old database still exists.
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+ // This is originally the c_group_info.id, NOT the c_group_info.iid, so
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+ // we need to check the existence of a group with that id in course c_id
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+ // If the group doesn't exist anymore, skip the update/insertion (maybe
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+ // we should even delete it?)
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+
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+ if (isset($groups[$oldRow['c_id']][$oldRow['to_group_id']])) {
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+ $newGroupId = $groups[$oldRow['c_id']][$oldRow['to_group_id']];
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+ // also check if the new ID is different, otherwise we can avoid an update
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+ if ($oldRow['to_group_id'] != $newGroupId) {
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+ // Update this row to attach it to the right group
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+ $sqlFix = 'UPDATE c_item_property SET to_group_id = '.$newGroupId.' WHERE iid = '.$newRow['iid'];
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+ //echo $sqlFix.PHP_EOL;
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+ $newDBH->query($sqlFix);
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+ }
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+ }
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+ } else {
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+ //echo "xx> No corresponding c_item_property found".PHP_EOL;
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+
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+ // First check if the group referenced in the old database still exists.
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+ // This is originally the c_group_info.id, NOT the c_group_info.iid, so
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+ // we need to check the existence of a group with that id in course c_id
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+ // If the group doesn't exist anymore, skip the update/insertion (maybe
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+ // we should even delete it?)
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+
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+ if (isset($groups[$oldRow['c_id']][$oldRow['to_group_id']])) {
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+ $newGroupId = $groups[$oldRow['c_id']][$oldRow['to_group_id']];
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+
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+ // Insert a new row to make the group calendar event visible again
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+ $sqlFix = 'INSERT INTO c_item_property(c_id, to_group_id, to_user_id, '.
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+ ' insert_user_id, session_id, tool, insert_date, lastedit_date, ref,'.
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+ ' lastedit_type, lastedit_user_id, visibility, start_visible, end_visible)'.
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+ " VALUES ("
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+ .$oldRow['c_id'].', '
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+ .$newGroupId.', '
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+ .' NULL, '
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+ .$oldRow['insert_user_id'].', '
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+ .$sessionInsert.', '
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+ .'\''.$oldRow['tool'].'\', '
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+ .'\''.$oldRow['insert_date'].'\', '
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+ .'\''.$oldRow['lastedit_date'].'\', '
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+ .$oldRow['ref'].', '
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+ .'\''.$oldRow['lastedit_type'].'\', '
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+ .$oldRow['lastedit_user_id'].', '
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+ .$oldRow['visibility'].', '
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+ .'\''.$oldRow['start_visible'].'\', '
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+ .'\''.$oldRow['end_visible'].'\''
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+ .')';
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+ //echo $sqlFix.PHP_EOL;
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+ $newDBH->query($sqlFix);
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+ }
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+ }
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+}
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+
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+echo PHP_EOL;
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+$diff = $totalCount - $foundCount;
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+echo "Found $foundCount corresponding c_item_property on a total of $totalCount items searched for (we're missing $diff)".PHP_EOL;
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+
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+/**
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+ * Helper function to get a list of existing groups from the c_group_info table
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+ * @return array
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+ */
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+function getOldGroupsByCourse() {
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+ global $oldDBH;
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+ global $newDBH;
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+ $groups = [];
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+ $courses = [];
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+ $sql = "SELECT id FROM course";
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+ foreach ($oldDBH->query($sql) as $course) {
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+ $sqlGroup = "SELECT id, iid FROM c_group_info WHERE c_id = ".$course['id'];
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+ foreach ($newDBH->query($sqlGroup) as $group) {
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+ if (!isset($courses[$course['id']])) {
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+ $courses[$course['id']] = [];
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+ }
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+ $courses[$course['id']][$group['id']] = $group['iid'];
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+ }
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+ }
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+ return $courses;
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+}
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