database.php

<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * persistence layer utility class
 *
 * @package assignsubmission_dta
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 * @copyright Gero Lueckemeyer and student project teams
 */
class DbUtils {

    /**
     * Summary database table name.
     */
    private const TABLE_SUMMARY = "assignsubmission_dta_summary";
    /**
     * Result database table name.
     */
    private const TABLE_RESULT = "assignsubmission_dta_result";

    /**
     * gets summary with all corresponding result entries
     *
     * @param int $assignmentid assignment id to search for
     * @param int $submissionid submission id to search for
     * @return DttResultSummary representing given submission
     */
    public static function getresultsummaryfromdatabase(
        int $assignmentid,
        int $submissionid
    ): DtaResultSummary {
        global $DB;

        // Fetch data from database.
        $summaryrecord = $DB->get_record(self::TABLE_SUMMARY, [
            "assignment_id" => $assignmentid,
            "submission_id" => $submissionid,
        ]);

        $resultsarray = $DB->get_records(self::TABLE_RESULT, [
            "assignment_id" => $assignmentid,
            "submission_id" => $submissionid,
        ]);

        // Create a summary instance.
        $summary = new DtaResultSummary();
        $summary->timestamp = $summaryrecord->timestamp;
        $summary->globalstacktrace = $summaryrecord->global_stacktrace;
        $summary->successfultestcompetencies = $summaryrecord->successful_competencies;
        $summary->overalltestcompetencies = $summaryrecord->tested_competencies;
        $summary->results = [];

        // Create result instances and add to array of summary instance.
        foreach ($resultsarray as $rr) {
            $result = new DtaResult();
            $result->packagename = $rr->package_name;