120 lines
3.2 KiB
PHP
120 lines
3.2 KiB
PHP
<?php
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/**
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* ---------------------------------------------------------------------
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* GLPI - Gestionnaire Libre de Parc Informatique
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* Copyright (C) 2015-2020 Teclib' and contributors.
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*
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* http://glpi-project.org
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*
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* based on GLPI - Gestionnaire Libre de Parc Informatique
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* Copyright (C) 2003-2014 by the INDEPNET Development Team.
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*
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* ---------------------------------------------------------------------
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*
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* LICENSE
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*
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* This file is part of GLPI.
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*
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* GLPI 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 2 of the License, or
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* (at your option) any later version.
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*
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* GLPI 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 GLPI. If not, see <http://www.gnu.org/licenses/>.
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* ---------------------------------------------------------------------
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*/
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if (!defined('GLPI_ROOT')) {
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die("Sorry. You can't access this file directly");
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}
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/**
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* UNION query class
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**/
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class QueryUnion extends AbstractQuery {
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private $queries = [];
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private $distinct = false;
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/**
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* Create a sub query
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*
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* @param array $queries An array of queries to union. Either SubQuery objects
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* or an array of criteria to build them.
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* You can also add later using @see addQuery
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* @param boolean $distinct Include duplicatesi or not. Turning on may has
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* huge cost on queries performances.
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* @param string $alias Union ALIAS. Defaults to null.
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*/
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public function __construct(array $queries = [], $distinct = false, $alias = null) {
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parent::__construct($alias);
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$this->distinct = $distinct;
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foreach ($queries as $query) {
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$this->addQuery($query);
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}
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}
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/**
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* Add a query
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*
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* @param QuerySubQuery|array $query Either a SubQuery object
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* or an array of criteria to build it.
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*/
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public function addQuery($query) {
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if (!$query instanceof \QuerySubQuery) {
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$query = new \QuerySubQuery($query);
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}
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$this->queries[] = $query;
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}
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/**
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* Get queries
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*
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* @return array
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*/
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public function getQueries() {
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return $this->queries;
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}
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/**
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*
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* Get SQL query
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*
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* @return string
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*/
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public function getQuery() {
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global $DB;
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$union_queries = $this->getQueries();
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if (empty($union_queries
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)) {
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throw new \RuntimeException('Cannot build an empty union query');
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}
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$queries = [];
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foreach ($union_queries as $uquery) {
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$queries[] = $uquery->getQuery();
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}
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$keyword = 'UNION';
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if (!$this->distinct) {
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$keyword .= ' ALL';
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}
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$query = '(' . implode(" $keyword ", $queries) . ')';
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$alias = $this->alias !== null
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? $this->alias
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: 'union_' . md5($query);
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$query .= ' AS ' . $DB->quoteName($alias);
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return $query;
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}
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}
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