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80829be920
Commiting this fix so it gets into 1.9.4. I've tested and it does not break sensible databases, and probably fixes the problem on MSSQL.
510 lines
27 KiB
PHP
510 lines
27 KiB
PHP
<?php // $Id$
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/**
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* Question bank backup code.
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*
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* @license http://www.gnu.org/copyleft/gpl.html GNU Public License
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* @package questionbank
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*//** */
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//This is the "graphical" structure of the question database:
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//To see, put your terminal to 160cc
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// The following holds student-independent information about the questions
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//
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// question_categories
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// (CL,pk->id)
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// |
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// |
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// |.......................................
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// | .
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// | .
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// | -------question_datasets------ .
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// | | (CL,pk->id,fk->question, | .
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// | | fk->dataset_definition) | .
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// | | | .
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// | | | .
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// | | | .
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// | | question_dataset_definitions
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// | | (CL,pk->id,fk->category)
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// question |
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// (CL,pk->id,fk->category,files) |
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// | question_dataset_items
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// | (CL,pk->id,fk->definition)
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// |
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// |
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// |
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// --------------------------------------------------------------------------------------------------------------
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// | | | | | | |
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// | | | | | | |
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// | | | | question_calculated | |
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// question_truefalse | question_multichoice | (CL,pl->id,fk->question) | |
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// (CL,pk->id,fk->question) | (CL,pk->id,fk->question) | . | | question_randomsamatch
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// . | . | . | |--(CL,pk->id,fk->question)
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// . question_shortanswer . question_numerical . question_multianswer. |
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// . (CL,pk->id,fk->question) . (CL,pk->id,fk->question) . (CL,pk->id,fk->question) |
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// . . . . . . | question_match
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// . . . . . . |--(CL,pk->id,fk->question)
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// . . . . . . | .
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// . . . . . . | .
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// . . . . . . | .
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// . . . . . . | question_match_sub
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// ........................................................................................ |--(CL,pk->id,fk->question)
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// . |
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// . |
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// . | question_numerical_units
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// question_answers |--(CL,pk->id,fk->question)
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// (CL,pk->id,fk->question)----------------------------------------------------------
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//
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//
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// The following holds the information about student interaction with the questions
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//
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// question_sessions
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// (UL,pk->id,fk->attempt,question)
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// .
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// .
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// question_states
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// (UL,pk->id,fk->attempt,question)
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//
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// Meaning: pk->primary key field of the table
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// fk->foreign key to link with parent
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// nt->nested field (recursive data)
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// SL->site level info
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// CL->course level info
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// UL->user level info
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// files->table may have files
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//
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//-----------------------------------------------------------
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require_once("$CFG->libdir/questionlib.php");
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function backup_question_category_context($bf, $contextid, $course) {
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global $DB;
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$status = true;
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$context = get_context_instance_by_id($contextid);
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$status = $status && fwrite($bf,start_tag("CONTEXT",4,true));
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switch ($context->contextlevel){
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case CONTEXT_MODULE:
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$status = $status && fwrite($bf,full_tag("LEVEL",5,false, 'module'));
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$status = $status && fwrite($bf,full_tag("INSTANCE",5,false, $context->instanceid));
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break;
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case CONTEXT_COURSE:
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$status = $status && fwrite($bf,full_tag("LEVEL",5,false, 'course'));
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break;
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case CONTEXT_COURSECAT:
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$thiscourse = $DB->get_record('course', array('id'=>$course));
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$cat = $thiscourse->category;
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$catno = 1;
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while($context->instanceid != $cat){
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$catno ++;
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if ($cat ==0) {
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return false;
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}
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$cat = $DB->get_field('course_categories', 'parent', array('id'=>$cat));
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}
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$status = $status && fwrite($bf,full_tag("LEVEL",5,false, 'coursecategory'));
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$status = $status && fwrite($bf,full_tag("COURSECATEGORYLEVEL",5,false, $catno));
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break;
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case CONTEXT_SYSTEM:
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$status = $status && fwrite($bf,full_tag("LEVEL",5,false, 'system'));
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break;
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default :
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return false;
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}
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$status = $status && fwrite($bf,end_tag("CONTEXT",4,true));
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return $status;
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}
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function backup_question_categories($bf,$preferences) {
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global $CFG, $DB;
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$status = true;
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//First, we get the used categories from backup_ids
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$categories = question_category_ids_by_backup ($preferences->backup_unique_code);
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//If we've categories
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if ($categories) {
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//Write start tag
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$status = $status && fwrite($bf,start_tag("QUESTION_CATEGORIES",2,true));
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//Iterate over each category
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foreach ($categories as $cat) {
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//Start category
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$status = $status && fwrite ($bf,start_tag("QUESTION_CATEGORY",3,true));
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//Get category data from question_categories
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$category = $DB->get_record ("question_categories", array("id"=>$cat->old_id));
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//Print category contents
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$status = $status && fwrite($bf,full_tag("ID",4,false,$category->id));
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$status = $status && fwrite($bf,full_tag("NAME",4,false,$category->name));
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$status = $status && fwrite($bf,full_tag("INFO",4,false,$category->info));
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$status = $status && backup_question_category_context($bf, $category->contextid, $preferences->backup_course);
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$status = $status && fwrite($bf,full_tag("STAMP",4,false,$category->stamp));
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$status = $status && fwrite($bf,full_tag("PARENT",4,false,$category->parent));
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$status = $status && fwrite($bf,full_tag("SORTORDER",4,false,$category->sortorder));
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//Now, backup their questions
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$status = $status && backup_question($bf,$preferences,$category->id);
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//End category
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$status = $status && fwrite ($bf,end_tag("QUESTION_CATEGORY",3,true));
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}
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//Write end tag
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$status = $status && fwrite ($bf,end_tag("QUESTION_CATEGORIES",2,true));
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}
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return $status;
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}
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//This function backups all the questions in selected category and their
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//asociated data
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function backup_question($bf,$preferences,$category, $level = 4) {
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global $CFG, $QTYPES, $DB;
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$status = true;
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// We'll fetch the questions sorted by parent so that questions with no parents
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// (these are the ones which could be parents themselves) are backed up first. This
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// is important for the recoding of the parent field during the restore process
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// Only select questions with ids in backup_ids table
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$questions = $DB->get_records_sql("SELECT q.* FROM {backup_ids} bk, {question} q
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WHERE q.category= ? AND
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bk.old_id=q.id AND
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bk.backup_code = ?
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ORDER BY parent ASC, id", array($category, $preferences->backup_unique_code));
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//If there are questions
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if ($questions) {
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//Write start tag
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$status = $status && fwrite ($bf,start_tag("QUESTIONS",$level,true));
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$counter = 0;
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//Iterate over each question
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foreach ($questions as $question) {
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// Deal with missing question types - they need to be included becuase
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// user data or quizzes may refer to them.
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if (!array_key_exists($question->qtype, $QTYPES)) {
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$question->qtype = 'missingtype';
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$question->questiontext = '<p>' . get_string('warningmissingtype', 'quiz') . '</p>' . $question->questiontext;
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}
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//Start question
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$status = $status && fwrite ($bf,start_tag("QUESTION",$level + 1,true));
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//Print question contents
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fwrite ($bf,full_tag("ID",$level + 2,false,$question->id));
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fwrite ($bf,full_tag("PARENT",$level + 2,false,$question->parent));
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fwrite ($bf,full_tag("NAME",$level + 2,false,$question->name));
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fwrite ($bf,full_tag("QUESTIONTEXT",$level + 2,false,$question->questiontext));
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fwrite ($bf,full_tag("QUESTIONTEXTFORMAT",$level + 2,false,$question->questiontextformat));
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fwrite ($bf,full_tag("IMAGE",$level + 2,false,$question->image));
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fwrite ($bf,full_tag("GENERALFEEDBACK",$level + 2,false,$question->generalfeedback));
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fwrite ($bf,full_tag("DEFAULTGRADE",$level + 2,false,$question->defaultgrade));
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fwrite ($bf,full_tag("PENALTY",$level + 2,false,$question->penalty));
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fwrite ($bf,full_tag("QTYPE",$level + 2,false,$question->qtype));
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fwrite ($bf,full_tag("LENGTH",$level + 2,false,$question->length));
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fwrite ($bf,full_tag("STAMP",$level + 2,false,$question->stamp));
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fwrite ($bf,full_tag("VERSION",$level + 2,false,$question->version));
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fwrite ($bf,full_tag("HIDDEN",$level + 2,false,$question->hidden));
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fwrite ($bf,full_tag("TIMECREATED",$level + 2,false,$question->timecreated));
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fwrite ($bf,full_tag("TIMEMODIFIED",$level + 2,false,$question->timemodified));
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fwrite ($bf,full_tag("CREATEDBY",$level + 2,false,$question->createdby));
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fwrite ($bf,full_tag("MODIFIEDBY",$level + 2,false,$question->modifiedby));
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// Backup question type specific data
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$status = $status && $QTYPES[$question->qtype]->backup($bf,$preferences,$question->id, $level + 2);
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//End question
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$status = $status && fwrite ($bf,end_tag("QUESTION",$level + 1,true));
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//Do some output
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$counter++;
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if ($counter % 10 == 0) {
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echo ".";
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if ($counter % 200 == 0) {
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echo "<br />";
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}
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backup_flush(300);
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}
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}
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//Write end tag
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$status = $status && fwrite ($bf,end_tag("QUESTIONS",$level,true));
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}
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return $status;
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}
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//This function backups the answers data in some question types
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//(truefalse, shortanswer,multichoice,numerical,calculated)
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function question_backup_answers($bf,$preferences,$question, $level = 6) {
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global $CFG, $DB;
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$status = true;
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$answers = $DB->get_records("question_answers", array("question"=>$question), "id");
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//If there are answers
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if ($answers) {
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$status = $status && fwrite ($bf,start_tag("ANSWERS",$level,true));
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//Iterate over each answer
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foreach ($answers as $answer) {
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$status = $status && fwrite ($bf,start_tag("ANSWER",$level + 1,true));
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//Print answer contents
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fwrite ($bf,full_tag("ID",$level + 2,false,$answer->id));
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fwrite ($bf,full_tag("ANSWER_TEXT",$level + 2,false,$answer->answer));
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fwrite ($bf,full_tag("FRACTION",$level + 2,false,$answer->fraction));
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fwrite ($bf,full_tag("FEEDBACK",$level + 2,false,$answer->feedback));
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$status = $status && fwrite ($bf,end_tag("ANSWER",$level + 1,true));
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}
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$status = $status && fwrite ($bf,end_tag("ANSWERS",$level,true));
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}
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return $status;
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}
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//This function backups question_numerical_units from different question types
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function question_backup_numerical_units($bf,$preferences,$question,$level=7) {
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global $CFG, $DB;
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$status = true;
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$numerical_units = $DB->get_records("question_numerical_units", array("question"=>$question), "id");
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//If there are numericals_units
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if ($numerical_units) {
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$status = $status && fwrite ($bf,start_tag("NUMERICAL_UNITS",$level,true));
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//Iterate over each numerical_unit
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foreach ($numerical_units as $numerical_unit) {
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$status = $status && fwrite ($bf,start_tag("NUMERICAL_UNIT",$level+1,true));
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//Print numerical_unit contents
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fwrite ($bf,full_tag("MULTIPLIER",$level+2,false,$numerical_unit->multiplier));
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fwrite ($bf,full_tag("UNIT",$level+2,false,$numerical_unit->unit));
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//Now backup numerical_units
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$status = $status && fwrite ($bf,end_tag("NUMERICAL_UNIT",$level+1,true));
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}
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$status = $status && fwrite ($bf,end_tag("NUMERICAL_UNITS",$level,true));
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}
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return $status;
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}
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//This function backups dataset_definitions (via question_datasets) from different question types
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function question_backup_datasets($bf,$preferences,$question,$level=7) {
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global $CFG, $DB;
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$status = true;
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//First, we get the used datasets for this question
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$question_datasets = $DB->get_records("question_datasets", array("question"=>$question), "id");
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//If there are question_datasets
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if ($question_datasets) {
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$status = $status &&fwrite ($bf,start_tag("DATASET_DEFINITIONS",$level,true));
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//Iterate over each question_dataset
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foreach ($question_datasets as $question_dataset) {
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$def = NULL;
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//Get dataset_definition
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if ($def = $DB->get_record("question_dataset_definitions", array("id"=>$question_dataset->datasetdefinition))) {;
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$status = $status &&fwrite ($bf,start_tag("DATASET_DEFINITION",$level+1,true));
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//Print question_dataset contents
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fwrite ($bf,full_tag("CATEGORY",$level+2,false,$def->category));
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fwrite ($bf,full_tag("NAME",$level+2,false,$def->name));
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fwrite ($bf,full_tag("TYPE",$level+2,false,$def->type));
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fwrite ($bf,full_tag("OPTIONS",$level+2,false,$def->options));
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fwrite ($bf,full_tag("ITEMCOUNT",$level+2,false,$def->itemcount));
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//Now backup dataset_entries
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$status = $status && question_backup_dataset_items($bf,$preferences,$def->id,$level+2);
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//End dataset definition
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$status = $status &&fwrite ($bf,end_tag("DATASET_DEFINITION",$level+1,true));
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}
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}
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$status = $status &&fwrite ($bf,end_tag("DATASET_DEFINITIONS",$level,true));
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}
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return $status;
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}
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//This function backups datases_items from dataset_definitions
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function question_backup_dataset_items($bf,$preferences,$datasetdefinition,$level=9) {
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global $CFG, $DB;
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$status = true;
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//First, we get the datasets_items for this dataset_definition
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$dataset_items = $DB->get_records("question_dataset_items", array("definition"=>$datasetdefinition), "id");
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//If there are dataset_items
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if ($dataset_items) {
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$status = $status &&fwrite ($bf,start_tag("DATASET_ITEMS",$level,true));
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//Iterate over each dataset_item
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foreach ($dataset_items as $dataset_item) {
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$status = $status &&fwrite ($bf,start_tag("DATASET_ITEM",$level+1,true));
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//Print question_dataset contents
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fwrite ($bf,full_tag("NUMBER",$level+2,false,$dataset_item->itemnumber));
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fwrite ($bf,full_tag("VALUE",$level+2,false,$dataset_item->value));
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//End dataset definition
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$status = $status &&fwrite ($bf,end_tag("DATASET_ITEM",$level+1,true));
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}
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$status = $status &&fwrite ($bf,end_tag("DATASET_ITEMS",$level,true));
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}
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return $status;
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}
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//Backup question_states contents (executed from backup_quiz_attempts)
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function backup_question_states ($bf,$preferences,$attempt, $level = 6) {
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global $CFG, $DB;
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$status = true;
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$question_states = $DB->get_records("question_states", array("attempt"=>$attempt),"id");
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//If there are states
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if ($question_states) {
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//Write start tag
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$status = $status && fwrite ($bf,start_tag("STATES",$level,true));
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//Iterate over each state
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foreach ($question_states as $state) {
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//Start state
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$status = $status && fwrite ($bf,start_tag("STATE",$level + 1,true));
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//Print state contents
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fwrite ($bf,full_tag("ID",$level + 2,false,$state->id));
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fwrite ($bf,full_tag("QUESTION",$level + 2,false,$state->question));
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fwrite ($bf,full_tag("SEQ_NUMBER",$level + 2,false,$state->seq_number));
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fwrite ($bf,full_tag("ANSWER",$level + 2,false,$state->answer));
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fwrite ($bf,full_tag("TIMESTAMP",$level + 2,false,$state->timestamp));
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fwrite ($bf,full_tag("EVENT",$level + 2,false,$state->event));
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fwrite ($bf,full_tag("GRADE",$level + 2,false,$state->grade));
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fwrite ($bf,full_tag("RAW_GRADE",$level + 2,false,$state->raw_grade));
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fwrite ($bf,full_tag("PENALTY",$level + 2,false,$state->penalty));
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//End state
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$status = $status && fwrite ($bf,end_tag("STATE",$level + 1,true));
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}
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//Write end tag
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$status = $status && fwrite ($bf,end_tag("STATES",$level,true));
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}
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}
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//Backup question_sessions contents (executed from backup_quiz_attempts)
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function backup_question_sessions ($bf,$preferences,$attempt, $level = 6) {
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global $CFG, $DB;
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$status = true;
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$question_sessions = $DB->get_records("question_sessions", array("attemptid"=>$attempt), "id");
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//If there are sessions
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if ($question_sessions) {
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//Write start tag (the funny name 'newest states' has historical reasons)
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$status = $status && fwrite ($bf,start_tag("NEWEST_STATES",$level,true));
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//Iterate over each newest_state
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foreach ($question_sessions as $newest_state) {
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//Start newest_state
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$status = $status && fwrite ($bf,start_tag("NEWEST_STATE",$level + 1,true));
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//Print newest_state contents
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fwrite ($bf,full_tag("ID",$level + 2,false,$newest_state->id));
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fwrite ($bf,full_tag("QUESTIONID",$level + 2,false,$newest_state->questionid));
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fwrite ($bf,full_tag("NEWEST",$level + 2,false,$newest_state->newest));
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fwrite ($bf,full_tag("NEWGRADED",$level + 2,false,$newest_state->newgraded));
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fwrite ($bf,full_tag("SUMPENALTY",$level + 2,false,$newest_state->sumpenalty));
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fwrite ($bf,full_tag("MANUALCOMMENT",$level + 2,false,$newest_state->manualcomment));
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//End newest_state
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$status = $status && fwrite ($bf,end_tag("NEWEST_STATE",$level + 1,true));
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}
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//Write end tag
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$status = $status && fwrite ($bf,end_tag("NEWEST_STATES",$level,true));
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}
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return $status;
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}
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//Returns an array of categories id
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function question_category_ids_by_backup ($backup_unique_code) {
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global $CFG, $DB;
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return $DB->get_records_sql("SELECT a.old_id, a.backup_code
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FROM {backup_ids} a
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WHERE a.backup_code = ? AND
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a.table_name = 'question_categories'", array($backup_unique_code));
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}
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function question_ids_by_backup ($backup_unique_code) {
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global $CFG, $DB;
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return $DB->get_records_sql("SELECT old_id, backup_code
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FROM {backup_ids}
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WHERE backup_code = ? AND
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table_name = 'question'", array($backup_unique_code));
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}
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//Function for inserting question and category ids into db that are all called from
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// quiz_check_backup_mods during execution of backup_check.html
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function question_insert_c_and_q_ids_for_course($coursecontext, $backup_unique_code){
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global $CFG, $DB;
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// First, all categories from this course's context.
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$status = $DB->execute("INSERT INTO {backup_ids} (backup_code, table_name, old_id, info)
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SELECT '$backup_unique_code', 'question_categories', qc.id, 'course'
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FROM {question_categories} qc
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WHERE qc.contextid = ?", array($coursecontext->id));
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$status = $status && question_insert_q_ids($backup_unique_code, 'course');
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return $status;
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}
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/**
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* Insert all question ids for categories whose ids have already been inserted in the backup_ids table
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* Insert code to identify categories to later insert all question ids later eg. course, quiz or other module name.
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*/
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function question_insert_q_ids($backup_unique_code, $info){
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global $CFG,$DB;
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//put the ids of the questions from all these categories into the db.
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$status = $DB->execute("INSERT INTO {backup_ids} (backup_code, table_name, old_id, info)
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SELECT '$backup_unique_code', 'question', q.id, ''
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FROM {question} q, {backup_ids} bk
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WHERE q.category = bk.old_id AND bk.table_name = 'question_categories'
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AND " . $DB->sql_compare_text('bk.info') . " = ?
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AND bk.backup_code = ?", array($info, $backup_unique_code));
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return $status;
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}
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function question_insert_c_and_q_ids_for_module($backup_unique_code, $course, $modulename, $instances){
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global $CFG, $DB;
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$status = true;
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// using 'dummykeyname' in sql because otherwise $DB->get_records_sql_menu returns an error
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// if two key names are the same.
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$cmcontexts = array();
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if(!empty($instances)) {
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list($usql, $params) = $DB->get_in_or_equal(array_keys($instances));
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$params[] = $modulename;
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$params[] = $course;
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$cmcontexts = $DB->get_records_sql_menu("SELECT c.id, c.id AS dummykeyname FROM {modules} m,
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{course_modules} cm, {context} c
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WHERE cm.instance $usql AND m.name = ? AND m.id = cm.module AND cm.id = c.instanceid
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AND c.contextlevel = ".CONTEXT_MODULE." AND cm.course = ?", $params);
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}
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if ($cmcontexts){
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list($usql, $params) = $DB->get_in_or_equal(array_keys($cmcontexts));
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$status = $status && $DB->execute("INSERT INTO {backup_ids} (backup_code, table_name, old_id, info)
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SELECT '$backup_unique_code', 'question_categories', qc.id, '$modulename'
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FROM {question_categories} qc
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WHERE qc.contextid $usql", $params);
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}
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$status = $status && question_insert_q_ids($backup_unique_code, $modulename);
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return $status;
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}
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function question_insert_site_file_names($course, $backup_unique_code){
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global $QTYPES, $CFG, $DB;
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$status = true;
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$questionids = question_ids_by_backup ($backup_unique_code);
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$urls = array();
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if ($questionids){
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foreach ($questionids as $question_bk){
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$question = $DB->get_record('question', array('id'=>$question_bk->old_id));
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$QTYPES[$question->qtype]->get_question_options($question);
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$urls = array_merge_recursive($urls, $QTYPES[$question->qtype]->find_file_links($question, SITEID));
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}
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}
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ksort($urls);
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foreach (array_keys($urls) as $url){
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if (file_exists($CFG->dataroot.'/'.SITEID.'/'.$url)){
|
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$inserturl = new object();
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$inserturl->backup_code = $backup_unique_code;
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$inserturl->file_type = 'site';
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$url = clean_param($url, PARAM_PATH);
|
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$inserturl->path = $url;
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$status = $status && $DB->insert_record('backup_files', $inserturl);
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} else {
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notify(get_string('linkedfiledoesntexist', 'question', $url));
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}
|
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}
|
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return $status;
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}
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?>
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