abstractqtype.php

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    * @param object $form
    * @param int $course
    * @param PARAM_ALPHA $wizardnow should be added as we are coming from question2.php
    */
    function save_question($question, $form, $course) {
        $wizardnow =  optional_param('wizardnow', '', PARAM_ALPHA);
        $id = optional_param('id', 0, PARAM_INT); // question id
        // in case 'question'
        // for a new question $form->id is empty
        // when saving as new question
        //   $question->id = 0, $form is $data from question2.php
        //   and $data->makecopy is defined as $data->id is the initial question id
        // edit case. If it is a new question we don't necessarily need to
        // return a valid question object

        // See where we're coming from
        switch($wizardnow) {
            case '' :
            case 'question': // coming from the first page, creating the second
                if (empty($form->id)) { // for a new question $form->id is empty
                    $question = parent::save_question($question, $form, $course);
                    //prepare the datasets using default $questionfromid
                    $this->preparedatasets($form);
                    $form->id = $question->id;
                    $this->save_dataset_definitions($form);
                } else if (!empty($form->makecopy)){
                    $questionfromid =  $form->id ;
                    $question = parent::save_question($question, $form, $course);
                    //prepare the datasets
                    $this->preparedatasets($form,$questionfromid);
                    $form->id = $question->id;
                    $this->save_as_new_dataset_definitions($form,$questionfromid );
                }  else {// editing a question
                    $question = parent::save_question($question, $form, $course);
                    //prepare the datasets
                    $this->preparedatasets($form,$question->id);
                    $form->id = $question->id;
                    $this->save_dataset_definitions($form);
                }
                break;
            case 'datasetdefinitions':

                $this->save_dataset_definitions($form);
                break;
            case 'datasetitems':
                $this->save_dataset_items($question, $form);
                break;
            default:
                error('Incorrect or no wizard page specified!');
                break;
        }
        return $question;
    }

    function save_dataset_items($question, $fromform){
        //overridden in child classes
    }

    function get_dataset_definitions($questionid, $newdatasets) {
        //get the existing datasets for this question
        $datasetdefs = array();
        if (!empty($questionid)) {
            global $CFG;
            $sql = "SELECT i.*
                    FROM {$CFG->prefix}question_datasets d,
                         {$CFG->prefix}question_dataset_definitions i
                    WHERE d.question = '$questionid'
                    AND   d.datasetdefinition = i.id
                   ";
            if ($records = get_records_sql($sql)) {
                foreach ($records as $r) {
                    $datasetdefs["$r->type-$r->category-$r->name"] = $r;
                }
            }
        }

        foreach ($newdatasets as $dataset) {
            if (!$dataset) {
                continue; // The no dataset case...
            }

            if (!isset($datasetdefs[$dataset])) {
                //make new datasetdef
                list($type, $category, $name) = explode('-', $dataset, 3);
                $datasetdef = new stdClass;
                $datasetdef->type = $type;
                $datasetdef->name = $name;
                $datasetdef->category  = $category;
                $datasetdef->itemcount = 0;
                $datasetdef->options   = 'uniform:1.0:10.0:1';
                $datasetdefs[$dataset] = clone($datasetdef);
            }
        }
        return $datasetdefs;
    }

    function save_dataset_definitions($form) {
        // Save datasets
        $datasetdefinitions = $this->get_dataset_definitions($form->id, $form->dataset);
        $tmpdatasets = array_flip($form->dataset);
        $defids = array_keys($datasetdefinitions);
        foreach ($defids as $defid) {
            $datasetdef = &$datasetdefinitions[$defid];
            if (isset($datasetdef->id)) {
                if (!isset($tmpdatasets[$defid])) {
                // This dataset is not used any more, delete it
                    delete_records('question_datasets',
                               'question', $form->id,
                               'datasetdefinition', $datasetdef->id);
                    if ($datasetdef->category == 0) { // Question local dataset
                        delete_records('question_dataset_definitions',
                         'id', $datasetdef->id);
                        delete_records('question_dataset_items',
                         'definition', $datasetdef->id);
                    }
                }
                // This has already been saved or just got deleted
                unset($datasetdefinitions[$defid]);
                continue;
            }

            if (!$datasetdef->id = insert_record(
                    'question_dataset_definitions', $datasetdef)) {
                error("Unable to create dataset $defid");
            }

            if (0 != $datasetdef->category) {
                // We need to look for already existing
                // datasets in the category.
                // By first creating the datasetdefinition above we
                // can manage to automatically take care of
                // some possible realtime concurrence
                if ($olderdatasetdefs = get_records_select(
                        'question_dataset_definitions',
                        "type = '$datasetdef->type'
                        AND name = '$datasetdef->name'
                        AND category = '$datasetdef->category'
                        AND id < $datasetdef->id
                        ORDER BY id DESC")) {

                    while ($olderdatasetdef = array_shift($olderdatasetdefs)) {
                        delete_records('question_dataset_definitions',
                                   'id', $datasetdef->id);
                        $datasetdef = $olderdatasetdef;
                    }
                }
            }

            // Create relation to this dataset:
            $questiondataset = new stdClass;
            $questiondataset->question = $form->id;
            $questiondataset->datasetdefinition = $datasetdef->id;
            if (!insert_record('question_datasets',
                               $questiondataset)) {
                error("Unable to create relation to dataset $name");
            }
            unset($datasetdefinitions[$defid]);
        }

        // Remove local obsolete datasets as well as relations
        // to datasets in other categories:
        if (!empty($datasetdefinitions)) {
            foreach ($datasetdefinitions as $def) {
                delete_records('question_datasets',
                               'question', $form->id,
                               'datasetdefinition', $def->id);

                if ($def->category == 0) { // Question local dataset
                    delete_records('question_dataset_definitions', 'id', $def->id);
                    delete_records('question_dataset_items',
                                   'definition', $def->id);
                }
            }
        }
    }
    /** This function create a copy of the datasets ( definition and dataitems)
    * from the preceding question if they remain in the new question
    * otherwise its create the datasets that have been added as in the
    * save_dataset_definitions()
    */
    function save_as_new_dataset_definitions($form, $initialid) {
    global $CFG ;
        // Get the datasets from the intial question
        $datasetdefinitions = $this->get_dataset_definitions($initialid, $form->dataset);
        // $tmpdatasets contains those of the new question
        $tmpdatasets = array_flip($form->dataset);
        $defids = array_keys($datasetdefinitions);// new datasets
        foreach ($defids as $defid) {
            $datasetdef = &$datasetdefinitions[$defid];
            if (isset($datasetdef->id)) {
                // This dataset exist in the initial question
                if (!isset($tmpdatasets[$defid])) {
                    // do not exist in the new question so ignore
                    unset($datasetdefinitions[$defid]);
                    continue;
                }
                // create a copy but not for category one
                if (0 == $datasetdef->category) {
                   $olddatasetid = $datasetdef->id ;
                   $olditemcount = $datasetdef->itemcount ;
                   $datasetdef->itemcount =0;
                   if (!$datasetdef->id = insert_record(
                        'question_dataset_definitions', $datasetdef)) {
                        error("Unable to create dataset $defid");
                   }
                   //copy the dataitems
                   $olditems = get_records_sql( // Use number as key!!
                        " SELECT itemnumber, value
                          FROM {$CFG->prefix}question_dataset_items
                          WHERE definition =  $olddatasetid ");
                   if (count($olditems) > 0 ) {
                        $itemcount = 0;
                        foreach($olditems as $item ){
                            $item->definition = $datasetdef->id;
                        if (!insert_record('question_dataset_items', $item)) {
                            error("Unable to insert dataset item $item->itemnumber with $item->value for $datasetdef->name");
                        }
                        $itemcount++;
                        }
                        //update item count
                        $datasetdef->itemcount =$itemcount;
                        update_record('question_dataset_definitions', $datasetdef);
                    } // end of  copy the dataitems
                }// end of  copy the datasetdef
                // Create relation to the new question with this
                // copy as new datasetdef from the initial question
                $questiondataset = new stdClass;
                $questiondataset->question = $form->id;
                $questiondataset->datasetdefinition = $datasetdef->id;
                if (!insert_record('question_datasets',
                                   $questiondataset)) {
                    error("Unable to create relation to dataset $name");
                }
                unset($datasetdefinitions[$defid]);
                continue;
            }// end of datasetdefs from the initial question
            // really new one code similar to save_dataset_definitions()
            if (!$datasetdef->id = insert_record(
                    'question_dataset_definitions', $datasetdef)) {
                error("Unable to create dataset $defid");
            }

            if (0 != $datasetdef->category) {
                // We need to look for already existing
                // datasets in the category.
                // By first creating the datasetdefinition above we
                // can manage to automatically take care of
                // some possible realtime concurrence
                if ($olderdatasetdefs = get_records_select(
                        'question_dataset_definitions',
                        "type = '$datasetdef->type'