81 lines
2.7 KiB
PHP
81 lines
2.7 KiB
PHP
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<?php
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/**
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* Doctrine ORM
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to kontakt@beberlei.de so I can send you a copy immediately.
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*/
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namespace Doctrine\ORM\Tools\Pagination;
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use Doctrine\ORM\Query\TreeWalkerAdapter,
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Doctrine\ORM\Query\AST\SelectStatement,
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Doctrine\ORM\Query\AST\SelectExpression,
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Doctrine\ORM\Query\AST\PathExpression,
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Doctrine\ORM\Query\AST\AggregateExpression;
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/**
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* Replaces the selectClause of the AST with a COUNT statement
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*
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* @category DoctrineExtensions
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* @package DoctrineExtensions\Paginate
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* @author David Abdemoulaie <dave@hobodave.com>
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* @copyright Copyright (c) 2010 David Abdemoulaie (http://hobodave.com/)
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* @license http://hobodave.com/license.txt New BSD License
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*/
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class CountWalker extends TreeWalkerAdapter
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{
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/**
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* Distinct mode hint name
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*/
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const HINT_DISTINCT = 'doctrine_paginator.distinct';
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/**
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* Walks down a SelectStatement AST node, modifying it to retrieve a COUNT
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*
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* @param SelectStatement $AST
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* @return void
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*/
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public function walkSelectStatement(SelectStatement $AST)
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{
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$rootComponents = array();
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foreach ($this->_getQueryComponents() AS $dqlAlias => $qComp) {
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$isParent = array_key_exists('parent', $qComp)
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&& $qComp['parent'] === null
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&& $qComp['nestingLevel'] == 0
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;
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if ($isParent) {
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$rootComponents[] = array($dqlAlias => $qComp);
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}
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}
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if (count($rootComponents) > 1) {
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throw new \RuntimeException("Cannot count query which selects two FROM components, cannot make distinction");
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}
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$root = reset($rootComponents);
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$parentName = key($root);
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$parent = current($root);
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$pathExpression = new PathExpression(
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PathExpression::TYPE_STATE_FIELD | PathExpression::TYPE_SINGLE_VALUED_ASSOCIATION, $parentName,
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$parent['metadata']->getSingleIdentifierFieldName()
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);
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$pathExpression->type = PathExpression::TYPE_STATE_FIELD;
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$distinct = $this->_getQuery()->getHint(self::HINT_DISTINCT);
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$AST->selectClause->selectExpressions = array(
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new SelectExpression(
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new AggregateExpression('count', $pathExpression, $distinct), null
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)
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);
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// ORDER BY is not needed, only increases query execution through unnecessary sorting.
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$AST->orderByClause = null;
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}
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}
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