Paul Holden
f47e89a9bd
Aggregation of report columns allows the report editor to perform common types of data aggregation (concatenation, sum, count, etc) on given columns.
81 lines
2.2 KiB
PHP
81 lines
2.2 KiB
PHP
<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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declare(strict_types=1);
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namespace core_reportbuilder\local\aggregation;
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use lang_string;
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use core_reportbuilder\local\report\column;
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/**
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* Column count aggregation type
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*
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* @package core_reportbuilder
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* @copyright 2021 Paul Holden <paulh@moodle.com>
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class count extends base {
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/**
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* Return aggregation name
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*
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* @return lang_string
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*/
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public static function get_name(): lang_string {
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return new lang_string('aggregationcount', 'core_reportbuilder');
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}
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/**
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* This aggregation can be performed on all column types
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*
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* @param int $columntype
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* @return bool
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*/
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public static function compatible(int $columntype): bool {
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return true;
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}
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/**
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* Return the aggregated field SQL
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*
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* @param string $field
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* @param int $columntype
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* @return string
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*/
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public static function get_field_sql(string $field, int $columntype): string {
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global $DB;
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if ($columntype === column::TYPE_LONGTEXT && $DB->get_dbfamily() === 'oracle') {
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$field = $DB->sql_compare_text($field, 255);
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}
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return "COUNT({$field})";
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}
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/**
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* Return formatted value for column when applying aggregation
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*
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* @param mixed $value
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* @param array $values
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* @param array $callbacks
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* @return mixed
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*/
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public static function format_value($value, array $values, array $callbacks) {
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return (int) reset($values);
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}
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}
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