Current File : /var/www/projetos/suporte.iigd.com.br/src/QueryUnion.php
<?php
/**
* ---------------------------------------------------------------------
*
* GLPI - Gestionnaire Libre de Parc Informatique
*
* http://glpi-project.org
*
* @copyright 2015-2024 Teclib' and contributors.
* @copyright 2003-2014 by the INDEPNET Development Team.
* @licence https://www.gnu.org/licenses/gpl-3.0.html
*
* ---------------------------------------------------------------------
*
* LICENSE
*
* This file is part of GLPI.
*
* This program 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.
*
* This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
*
* ---------------------------------------------------------------------
*/
/**
* UNION query class
**/
class QueryUnion extends AbstractQuery
{
private $queries = [];
private $distinct = false;
/**
* Create a sub query
*
* @param array $queries An array of queries to union. Either SubQuery objects
* or an array of criteria to build them.
* You can also add later using @see addQuery
* @param boolean $distinct Include duplicates or not. Turning on may has
* huge cost on queries performances.
* @param string $alias Union ALIAS. Defaults to null.
*/
public function __construct(array $queries = [], $distinct = false, $alias = null)
{
parent::__construct($alias);
$this->distinct = $distinct;
foreach ($queries as $query) {
$this->addQuery($query);
}
}
/**
* Add a query
*
* @param QuerySubQuery|array $query Either a SubQuery object
* or an array of criteria to build it.
*/
public function addQuery($query)
{
if (!$query instanceof \QuerySubQuery) {
$query = new \QuerySubQuery($query);
}
$this->queries[] = $query;
}
/**
* Get queries
*
* @return array
*/
public function getQueries()
{
return $this->queries;
}
/**
*
* Get SQL query
*
* @return string
*/
public function getQuery()
{
$union_queries = $this->getQueries();
if (
empty($union_queries)
) {
throw new \RuntimeException('Cannot build an empty union query');
}
$queries = [];
foreach ($union_queries as $uquery) {
$queries[] = $uquery->getQuery();
}
$keyword = 'UNION';
if (!$this->distinct) {
$keyword .= ' ALL';
}
$query = '(' . implode(" $keyword ", $queries) . ')';
$alias = $this->alias !== null
? $this->alias
: 'union_' . md5($query);
$query .= ' AS ' . DBmysql::quoteName($alias);
return $query;
}
}
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