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backuplib.php
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<?php // $Id$
/**
* Question bank backup code.
*
* @license http://www.gnu.org/copyleft/gpl.html GNU Public License
* @package questionbank
*//** */
//This is the "graphical" structure of the question database:
//To see, put your terminal to 160cc
// The following holds student-independent information about the questions
//
// question_categories
// (CL,pk->id)
// |
// |
// |.......................................
// | .
// | .
// | -------question_datasets------ .
// | | (CL,pk->id,fk->question, | .
// | | fk->dataset_definition) | .
// | | | .
// | | | .
// | | | .
// | | question_dataset_definitions
// | | (CL,pk->id,fk->category)
// question |
// (CL,pk->id,fk->category,files) |
// | question_dataset_items
// | (CL,pk->id,fk->definition)
// |
// |
// |
// --------------------------------------------------------------------------------------------------------------
// | | | | | | |
// | | | | | | |
// | | | | question_calculated | |
// question_truefalse | question_multichoice | (CL,pl->id,fk->question) | |
// (CL,pk->id,fk->question) | (CL,pk->id,fk->question) | . | | question_randomsamatch
// . | . | . | |--(CL,pk->id,fk->question)
// . question_shortanswer . question_numerical . question_multianswer. |
// . (CL,pk->id,fk->question) . (CL,pk->id,fk->question) . (CL,pk->id,fk->question) |
// . . . . . . | question_match
// . . . . . . |--(CL,pk->id,fk->question)
// . . . . . . | .
// . . . . . . | .
// . . . . . . | .
// . . . . . . | question_match_sub
// ........................................................................................ |--(CL,pk->id,fk->question)
// . |
// . |
// . | question_numerical_units
// question_answers |--(CL,pk->id,fk->question)
// (CL,pk->id,fk->question)----------------------------------------------------------
//
//
// The following holds the information about student interaction with the questions
//
// question_sessions
// (UL,pk->id,fk->attempt,question)
// .
// .
// question_states
// (UL,pk->id,fk->attempt,question)
//
// Meaning: pk->primary key field of the table
// fk->foreign key to link with parent
// nt->nested field (recursive data)
// SL->site level info
// CL->course level info
// UL->user level info
// files->table may have files
//
//-----------------------------------------------------------
require_once("$CFG->libdir/questionlib.php");
function backup_question_category_context($bf, $contextid, $course) {
global $DB;
$status = true;
$context = get_context_instance_by_id($contextid);
$status = $status && fwrite($bf,start_tag("CONTEXT",4,true));
switch ($context->contextlevel){
case CONTEXT_MODULE:
$status = $status && fwrite($bf,full_tag("LEVEL",5,false, 'module'));
$status = $status && fwrite($bf,full_tag("INSTANCE",5,false, $context->instanceid));
break;
case CONTEXT_COURSE:
$status = $status && fwrite($bf,full_tag("LEVEL",5,false, 'course'));
break;
case CONTEXT_COURSECAT:
$thiscourse = $DB->get_record('course', array('id'=>$course));
$cat = $thiscourse->category;
$catno = 1;
while($context->instanceid != $cat){
$catno ++;
if ($cat ==0) {
return false;
}
$cat = $DB->get_field('course_categories', 'parent', array('id'=>$cat));
}
$status = $status && fwrite($bf,full_tag("LEVEL",5,false, 'coursecategory'));
$status = $status && fwrite($bf,full_tag("COURSECATEGORYLEVEL",5,false, $catno));
break;
case CONTEXT_SYSTEM:
$status = $status && fwrite($bf,full_tag("LEVEL",5,false, 'system'));
break;
default :
return false;
}
$status = $status && fwrite($bf,end_tag("CONTEXT",4,true));
return $status;
}
function backup_question_categories($bf,$preferences) {
global $CFG, $DB;
$status = true;
//First, we get the used categories from backup_ids
$categories = question_category_ids_by_backup ($preferences->backup_unique_code);
//If we've categories
if ($categories) {
//Write start tag
$status = $status && fwrite($bf,start_tag("QUESTION_CATEGORIES",2,true));
//Iterate over each category
foreach ($categories as $cat) {
//Start category
$status = $status && fwrite ($bf,start_tag("QUESTION_CATEGORY",3,true));
//Get category data from question_categories
$category = $DB->get_record ("question_categories", array("id"=>$cat->old_id));
//Print category contents
$status = $status && fwrite($bf,full_tag("ID",4,false,$category->id));
$status = $status && fwrite($bf,full_tag("NAME",4,false,$category->name));
$status = $status && fwrite($bf,full_tag("INFO",4,false,$category->info));
$status = $status && backup_question_category_context($bf, $category->contextid, $preferences->backup_course);
$status = $status && fwrite($bf,full_tag("STAMP",4,false,$category->stamp));
$status = $status && fwrite($bf,full_tag("PARENT",4,false,$category->parent));
$status = $status && fwrite($bf,full_tag("SORTORDER",4,false,$category->sortorder));
//Now, backup their questions
$status = $status && backup_question($bf,$preferences,$category->id);
//End category
$status = $status && fwrite ($bf,end_tag("QUESTION_CATEGORY",3,true));
}
//Write end tag
$status = $status && fwrite ($bf,end_tag("QUESTION_CATEGORIES",2,true));
}
return $status;
}
//This function backups all the questions in selected category and their
//asociated data
function backup_question($bf,$preferences,$category, $level = 4) {
global $CFG, $QTYPES, $DB;
$status = true;
// We'll fetch the questions sorted by parent so that questions with no parents
// (these are the ones which could be parents themselves) are backed up first. This
// is important for the recoding of the parent field during the restore process
// Only select questions with ids in backup_ids table
$questions = $DB->get_records_sql("SELECT q.* FROM {backup_ids} bk, {question} q
WHERE q.category= ? AND
bk.old_id=q.id AND
bk.backup_code = ?
ORDER BY parent ASC, id", array($category, $preferences->backup_unique_code));
//If there are questions
if ($questions) {
//Write start tag
$status = $status && fwrite ($bf,start_tag("QUESTIONS",$level,true));
$counter = 0;
//Iterate over each question
foreach ($questions as $question) {
// Deal with missing question types - they need to be included becuase
// user data or quizzes may refer to them.
if (!array_key_exists($question->qtype, $QTYPES)) {
$question->qtype = 'missingtype';
$question->questiontext = '<p>' . get_string('warningmissingtype', 'quiz') . '</p>' . $question->questiontext;
}
//Start question
$status = $status && fwrite ($bf,start_tag("QUESTION",$level + 1,true));
//Print question contents
fwrite ($bf,full_tag("ID",$level + 2,false,$question->id));
fwrite ($bf,full_tag("PARENT",$level + 2,false,$question->parent));
fwrite ($bf,full_tag("NAME",$level + 2,false,$question->name));
fwrite ($bf,full_tag("QUESTIONTEXT",$level + 2,false,$question->questiontext));
fwrite ($bf,full_tag("QUESTIONTEXTFORMAT",$level + 2,false,$question->questiontextformat));
fwrite ($bf,full_tag("IMAGE",$level + 2,false,$question->image));
fwrite ($bf,full_tag("GENERALFEEDBACK",$level + 2,false,$question->generalfeedback));
fwrite ($bf,full_tag("DEFAULTGRADE",$level + 2,false,$question->defaultgrade));
fwrite ($bf,full_tag("PENALTY",$level + 2,false,$question->penalty));
fwrite ($bf,full_tag("QTYPE",$level + 2,false,$question->qtype));
fwrite ($bf,full_tag("LENGTH",$level + 2,false,$question->length));
fwrite ($bf,full_tag("STAMP",$level + 2,false,$question->stamp));
fwrite ($bf,full_tag("VERSION",$level + 2,false,$question->version));
fwrite ($bf,full_tag("HIDDEN",$level + 2,false,$question->hidden));
fwrite ($bf,full_tag("TIMECREATED",$level + 2,false,$question->timecreated));
fwrite ($bf,full_tag("TIMEMODIFIED",$level + 2,false,$question->timemodified));
fwrite ($bf,full_tag("CREATEDBY",$level + 2,false,$question->createdby));
fwrite ($bf,full_tag("MODIFIEDBY",$level + 2,false,$question->modifiedby));
// Backup question type specific data
$status = $status && $QTYPES[$question->qtype]->backup($bf,$preferences,$question->id, $level + 2);
//End question
$status = $status && fwrite ($bf,end_tag("QUESTION",$level + 1,true));
//Do some output
$counter++;
if ($counter % 10 == 0) {
echo ".";
if ($counter % 200 == 0) {
echo "<br />";
}
backup_flush(300);
}
}
//Write end tag
$status = $status && fwrite ($bf,end_tag("QUESTIONS",$level,true));
}
return $status;
}
//This function backups the answers data in some question types
//(truefalse, shortanswer,multichoice,numerical,calculated)
function question_backup_answers($bf,$preferences,$question, $level = 6) {
global $CFG, $DB;
$status = true;
$answers = $DB->get_records("question_answers", array("question"=>$question), "id");
//If there are answers
if ($answers) {
$status = $status && fwrite ($bf,start_tag("ANSWERS",$level,true));
//Iterate over each answer
foreach ($answers as $answer) {
$status = $status && fwrite ($bf,start_tag("ANSWER",$level + 1,true));
//Print answer contents
fwrite ($bf,full_tag("ID",$level + 2,false,$answer->id));
fwrite ($bf,full_tag("ANSWER_TEXT",$level + 2,false,$answer->answer));
fwrite ($bf,full_tag("FRACTION",$level + 2,false,$answer->fraction));
fwrite ($bf,full_tag("FEEDBACK",$level + 2,false,$answer->feedback));
$status = $status && fwrite ($bf,end_tag("ANSWER",$level + 1,true));
}
$status = $status && fwrite ($bf,end_tag("ANSWERS",$level,true));
}
return $status;
}
//This function backups question_numerical_units from different question types
function question_backup_numerical_units($bf,$preferences,$question,$level=7) {
global $CFG, $DB;
$status = true;
$numerical_units = $DB->get_records("question_numerical_units", array("question"=>$question), "id");
//If there are numericals_units
if ($numerical_units) {
$status = $status && fwrite ($bf,start_tag("NUMERICAL_UNITS",$level,true));
//Iterate over each numerical_unit
foreach ($numerical_units as $numerical_unit) {
$status = $status && fwrite ($bf,start_tag("NUMERICAL_UNIT",$level+1,true));
//Print numerical_unit contents
fwrite ($bf,full_tag("MULTIPLIER",$level+2,false,$numerical_unit->multiplier));
fwrite ($bf,full_tag("UNIT",$level+2,false,$numerical_unit->unit));
//Now backup numerical_units
$status = $status && fwrite ($bf,end_tag("NUMERICAL_UNIT",$level+1,true));
}
$status = $status && fwrite ($bf,end_tag("NUMERICAL_UNITS",$level,true));
}
return $status;
}
//This function backups dataset_definitions (via question_datasets) from different question types
function question_backup_datasets($bf,$preferences,$question,$level=7) {
global $CFG, $DB;
$status = true;
//First, we get the used datasets for this question
$question_datasets = $DB->get_records("question_datasets", array("question"=>$question), "id");
//If there are question_datasets
if ($question_datasets) {
$status = $status &&fwrite ($bf,start_tag("DATASET_DEFINITIONS",$level,true));
//Iterate over each question_dataset
foreach ($question_datasets as $question_dataset) {
$def = NULL;
//Get dataset_definition
if ($def = $DB->get_record("question_dataset_definitions", array("id"=>$question_dataset->datasetdefinition))) {;
$status = $status &&fwrite ($bf,start_tag("DATASET_DEFINITION",$level+1,true));
//Print question_dataset contents
fwrite ($bf,full_tag("CATEGORY",$level+2,false,$def->category));
fwrite ($bf,full_tag("NAME",$level+2,false,$def->name));
fwrite ($bf,full_tag("TYPE",$level+2,false,$def->type));
fwrite ($bf,full_tag("OPTIONS",$level+2,false,$def->options));
fwrite ($bf,full_tag("ITEMCOUNT",$level+2,false,$def->itemcount));
//Now backup dataset_entries
$status = $status && question_backup_dataset_items($bf,$preferences,$def->id,$level+2);
//End dataset definition
$status = $status &&fwrite ($bf,end_tag("DATASET_DEFINITION",$level+1,true));
}
}
$status = $status &&fwrite ($bf,end_tag("DATASET_DEFINITIONS",$level,true));
}
return $status;
}
//This function backups datases_items from dataset_definitions
function question_backup_dataset_items($bf,$preferences,$datasetdefinition,$level=9) {
global $CFG, $DB;
$status = true;
//First, we get the datasets_items for this dataset_definition
$dataset_items = $DB->get_records("question_dataset_items", array("definition"=>$datasetdefinition), "id");
//If there are dataset_items
if ($dataset_items) {
$status = $status &&fwrite ($bf,start_tag("DATASET_ITEMS",$level,true));
//Iterate over each dataset_item
foreach ($dataset_items as $dataset_item) {
$status = $status &&fwrite ($bf,start_tag("DATASET_ITEM",$level+1,true));
//Print question_dataset contents
fwrite ($bf,full_tag("NUMBER",$level+2,false,$dataset_item->itemnumber));
fwrite ($bf,full_tag("VALUE",$level+2,false,$dataset_item->value));
//End dataset definition
$status = $status &&fwrite ($bf,end_tag("DATASET_ITEM",$level+1,true));
}
$status = $status &&fwrite ($bf,end_tag("DATASET_ITEMS",$level,true));
}
return $status;
}
//Backup question_states contents (executed from backup_quiz_attempts)
function backup_question_states ($bf,$preferences,$attempt, $level = 6) {
global $CFG, $DB;
$status = true;
$question_states = $DB->get_records("question_states", array("attempt"=>$attempt),"id");
//If there are states
if ($question_states) {
//Write start tag
$status = $status && fwrite ($bf,start_tag("STATES",$level,true));
//Iterate over each state
foreach ($question_states as $state) {
//Start state
$status = $status && fwrite ($bf,start_tag("STATE",$level + 1,true));
//Print state contents
fwrite ($bf,full_tag("ID",$level + 2,false,$state->id));
fwrite ($bf,full_tag("QUESTION",$level + 2,false,$state->question));
fwrite ($bf,full_tag("SEQ_NUMBER",$level + 2,false,$state->seq_number));
fwrite ($bf,full_tag("ANSWER",$level + 2,false,$state->answer));
fwrite ($bf,full_tag("TIMESTAMP",$level + 2,false,$state->timestamp));
fwrite ($bf,full_tag("EVENT",$level + 2,false,$state->event));
fwrite ($bf,full_tag("GRADE",$level + 2,false,$state->grade));
fwrite ($bf,full_tag("RAW_GRADE",$level + 2,false,$state->raw_grade));
fwrite ($bf,full_tag("PENALTY",$level + 2,false,$state->penalty));
//End state
$status = $status && fwrite ($bf,end_tag("STATE",$level + 1,true));
}
//Write end tag
$status = $status && fwrite ($bf,end_tag("STATES",$level,true));
}
}
//Backup question_sessions contents (executed from backup_quiz_attempts)
function backup_question_sessions ($bf,$preferences,$attempt, $level = 6) {
global $CFG, $DB;
$status = true;
$question_sessions = $DB->get_records("question_sessions", array("attemptid"=>$attempt), "id");
//If there are sessions
if ($question_sessions) {
//Write start tag (the funny name 'newest states' has historical reasons)
$status = $status && fwrite ($bf,start_tag("NEWEST_STATES",$level,true));
//Iterate over each newest_state
foreach ($question_sessions as $newest_state) {
//Start newest_state
$status = $status && fwrite ($bf,start_tag("NEWEST_STATE",$level + 1,true));
//Print newest_state contents
fwrite ($bf,full_tag("ID",$level + 2,false,$newest_state->id));
fwrite ($bf,full_tag("QUESTIONID",$level + 2,false,$newest_state->questionid));
fwrite ($bf,full_tag("NEWEST",$level + 2,false,$newest_state->newest));
fwrite ($bf,full_tag("NEWGRADED",$level + 2,false,$newest_state->newgraded));
fwrite ($bf,full_tag("SUMPENALTY",$level + 2,false,$newest_state->sumpenalty));
fwrite ($bf,full_tag("MANUALCOMMENT",$level + 2,false,$newest_state->manualcomment));
//End newest_state
$status = $status && fwrite ($bf,end_tag("NEWEST_STATE",$level + 1,true));
}
//Write end tag
$status = $status && fwrite ($bf,end_tag("NEWEST_STATES",$level,true));
}
return $status;
}
//Returns an array of categories id
function question_category_ids_by_backup ($backup_unique_code) {
global $CFG, $DB;
return $DB->get_records_sql("SELECT a.old_id, a.backup_code
FROM {backup_ids} a
WHERE a.backup_code = ? AND
a.table_name = 'question_categories'", array($backup_unique_code));
}
function question_ids_by_backup ($backup_unique_code) {
global $CFG, $DB;
return $DB->get_records_sql("SELECT old_id, backup_code
FROM {backup_ids}
WHERE backup_code = ? AND
table_name = 'question'", array($backup_unique_code));
}
//Function for inserting question and category ids into db that are all called from
// quiz_check_backup_mods during execution of backup_check.html
function question_insert_c_and_q_ids_for_course($coursecontext, $backup_unique_code){
global $CFG, $DB;
// First, all categories from this course's context.
$status = $DB->execute("INSERT INTO {backup_ids} (backup_code, table_name, old_id, info)
SELECT '$backup_unique_code', 'question_categories', qc.id, 'course'
FROM {question_categories} qc
WHERE qc.contextid = ?", array($coursecontext->id));
$status = $status && question_insert_q_ids($backup_unique_code, 'course');
return $status;
}
/**
* Insert all question ids for categories whose ids have already been inserted in the backup_ids table
* Insert code to identify categories to later insert all question ids later eg. course, quiz or other module name.
*/
function question_insert_q_ids($backup_unique_code, $info){
global $CFG,$DB;
//put the ids of the questions from all these categories into the db.
$status = $DB->execute("INSERT INTO {backup_ids} (backup_code, table_name, old_id, info)
SELECT '$backup_unique_code', 'question', q.id, ''
FROM {question} q, {backup_ids} bk
WHERE q.category = bk.old_id AND bk.table_name = 'question_categories'
AND bk.info = ?
AND bk.backup_code = ?", array($info, $backup_unique_code));
return $status;
}
function question_insert_c_and_q_ids_for_module($backup_unique_code, $course, $modulename, $instances){
global $CFG, $DB;
$status = true;
// using 'dummykeyname' in sql because otherwise $DB->get_records_sql_menu returns an error
// if two key names are the same.
$cmcontexts = array();
if(!empty($instances)) {
list($usql, $params) = $DB->get_in_or_equal(array_keys($instances));
$params[] = $modulename;
$params[] = $course;
$cmcontexts = $DB->get_records_sql_menu("SELECT c.id, c.id AS dummykeyname FROM {modules} m,
{course_modules} cm, {context} c
WHERE cm.instance $usql AND m.name = ? AND m.id = cm.module AND cm.id = c.instanceid
AND c.contextlevel = ".CONTEXT_MODULE." AND cm.course = ?", $params);
}
if ($cmcontexts){
list($usql, $params) = $DB->get_in_or_equal(array_keys($cmcontexts));
$status = $status && $DB->execute("INSERT INTO {backup_ids} (backup_code, table_name, old_id, info)
SELECT '$backup_unique_code', 'question_categories', qc.id, '$modulename'
FROM {question_categories} qc
WHERE qc.contextid $usql", $params);
}
$status = $status && question_insert_q_ids($backup_unique_code, $modulename);
return $status;
}
function question_insert_site_file_names($course, $backup_unique_code){
global $QTYPES, $CFG, $DB;
$status = true;
$questionids = question_ids_by_backup ($backup_unique_code);
$urls = array();
if ($questionids){
foreach ($questionids as $question_bk){
$question = $DB->get_record('question', array('id'=>$question_bk->old_id));
$QTYPES[$question->qtype]->get_question_options($question);
$urls = array_merge_recursive($urls, $QTYPES[$question->qtype]->find_file_links($question, SITEID));
}
}
ksort($urls);
foreach (array_keys($urls) as $url){
if (file_exists($CFG->dataroot.'/'.SITEID.'/'.$url)){
$inserturl = new object();
$inserturl->backup_code = $backup_unique_code;
$inserturl->file_type = 'site';
$url = clean_param($url, PARAM_PATH);
$inserturl->path = $url;
$status = $status && $DB->insert_record('backup_files', $inserturl);
} else {
notify(get_string('linkedfiledoesntexist', 'question', $url));
}
}
return $status;
}
?>