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<?php |
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/* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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* This software consists of voluntary contributions made by many individuals |
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* and is licensed under the MIT license. For more information, see |
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* <http://www.doctrine-project.org>. |
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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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use Doctrine\ORM\Query\AST\SelectStatement; |
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use Doctrine\ORM\Query\AST\SelectExpression; |
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use Doctrine\ORM\Query\AST\PathExpression; |
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use 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 <[email protected]> |
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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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* |
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* @return void |
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* |
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* @throws \RuntimeException |
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*/ |
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public function walkSelectStatement(SelectStatement $AST) |
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{ |
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if ($AST->havingClause) { |
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throw new \RuntimeException('Cannot count query that uses a HAVING clause. Use the output walkers for pagination'); |
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} |
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$queryComponents = $this->_getQueryComponents(); |
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// Get the root entity and alias from the AST fromClause |
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$from = $AST->fromClause->identificationVariableDeclarations; |
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if (count($from) > 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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$fromRoot = reset($from); |
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$rootAlias = $fromRoot->rangeVariableDeclaration->aliasIdentificationVariable; |
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$rootClass = $queryComponents[$rootAlias]['metadata']; |
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$identifierFieldName = $rootClass->getSingleIdentifierFieldName(); |
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$pathType = PathExpression::TYPE_STATE_FIELD; |
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if (isset($rootClass->associationMappings[$identifierFieldName])) { |
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$pathType = PathExpression::TYPE_SINGLE_VALUED_ASSOCIATION; |
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} |
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$pathExpression = new PathExpression( |
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PathExpression::TYPE_STATE_FIELD | PathExpression::TYPE_SINGLE_VALUED_ASSOCIATION, $rootAlias, |
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$identifierFieldName |
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); |
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$pathExpression->type = $pathType; |
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$distinct = $this->_getQuery()->getHint(self::HINT_DISTINCT); |
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$AST->selectClause->selectExpressions = [ |
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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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doctrine /
orm
