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     * Factory method which uses the parameters to retrieve all matching instances from the database
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     * Factory method which uses the parameters to retrieve all matching instances from the database
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     *
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     *
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     * @param string $table The table to retrieve from
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     * @param string $table The table to retrieve from
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     * @param string $classname The name of the class to instantiate
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     * @param string $classname The name of the class to instantiate
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     * @param array $params An array of conditions like $fieldname => $fieldvalue
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     * @param array $params An array of conditions like $fieldname => $fieldvalue
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     * @param string $sortby The SQL sort order. E.g. 'id ASC'
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     * @return array|bool Array of object instances or false if not found
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     * @return array|bool Array of object instances (sorted by $sortby) or false if not found
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     */
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     */
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    public static function fetch_all_helper($table, $classname, $params) {
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    public static function fetch_all_helper($table, $classname, $params, string $sortby = 'id ASC') {
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        global $DB; // Need to introspect DB here.
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        global $DB; // Need to introspect DB here.
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        $instance = new $classname();
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        $instance = new $classname();
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        } else {
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        } else {
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            $wheresql = implode("AND", $wheresql);
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            $wheresql = implode("AND", $wheresql);
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        }
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        }
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        global $DB;
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        global $DB;
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        $rs = $DB->get_recordset_select($table, $wheresql, $newparams);
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        $rs = $DB->get_recordset_select($table, $wheresql, $newparams, $sortby);
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        //returning false rather than empty array if nothing found
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        //returning false rather than empty array if nothing found
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        if (!$rs->valid()) {
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        if (!$rs->valid()) {
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            $rs->close();
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            $rs->close();
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            return false;
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            return false;
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    /**
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    /**
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     * Handles adding feedback files in the gradebook.
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     * Handles adding feedback files in the gradebook.
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     *
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     *
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     * @param int|null $historyid
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     * @param int|null $historyid
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     */
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     */
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    protected function add_feedback_files(int $historyid = null) {
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    protected function add_feedback_files(?int $historyid = null) {
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    }
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    }
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    /**
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    /**
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     * Handles updating feedback files in the gradebook.
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     * Handles updating feedback files in the gradebook.
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     *
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     *
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     * @param int|null $historyid
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     * @param int|null $historyid
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     */
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     */
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    protected function update_feedback_files(int $historyid = null) {
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    protected function update_feedback_files(?int $historyid = null) {
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    }
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    }
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    /**
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    /**