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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\DBAL\Types\Type; |
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use Doctrine\ORM\Mapping\ClassMetadataInfo; |
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use Doctrine\ORM\Query; |
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use Doctrine\ORM\Query\TreeWalkerAdapter; |
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use Doctrine\ORM\Query\AST\Functions\IdentityFunction; |
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use Doctrine\ORM\Query\AST\PathExpression; |
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use Doctrine\ORM\Query\AST\SelectExpression; |
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use Doctrine\ORM\Query\AST\SelectStatement; |
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/** |
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* Replaces the selectClause of the AST with a SELECT DISTINCT root.id equivalent. |
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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 LimitSubqueryWalker extends TreeWalkerAdapter |
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{ |
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/** |
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* ID type hint. |
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*/ |
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const IDENTIFIER_TYPE = 'doctrine_paginator.id.type'; |
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/** |
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* Counter for generating unique order column aliases. |
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* |
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* @var int |
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*/ |
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private $_aliasCounter = 0; |
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/** |
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* Walks down a SelectStatement AST node, modifying it to retrieve DISTINCT ids |
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* of the root Entity. |
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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 $AST) |
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{ |
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$queryComponents = $this->_getQueryComponents(); |
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// Get the root entity and alias from the AST fromClause |
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$from = $AST->fromClause->identificationVariableDeclarations; |
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$fromRoot = reset($from); |
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$rootAlias = $fromRoot->rangeVariableDeclaration->aliasIdentificationVariable; |
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$rootClass = $queryComponents[$rootAlias]['metadata']; |
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$this->validate($AST); |
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$identifier = $rootClass->getSingleIdentifierFieldName(); |
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if (isset($rootClass->associationMappings[$identifier])) { |
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throw new \RuntimeException("Paginating an entity with foreign key as identifier only works when using the Output Walkers. Call Paginator#setUseOutputWalkers(true) before iterating the paginator."); |
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} |
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$this->_getQuery()->setHint( |
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self::IDENTIFIER_TYPE, |
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Type::getType($rootClass->fieldMappings[$identifier]['type']) |
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); |
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$pathExpression = new PathExpression( |
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PathExpression::TYPE_STATE_FIELD | PathExpression::TYPE_SINGLE_VALUED_ASSOCIATION, |
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$rootAlias, |
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$identifier |
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); |
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$pathExpression->type = PathExpression::TYPE_STATE_FIELD; |
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$AST->selectClause->selectExpressions = [new SelectExpression($pathExpression, '_dctrn_id')]; |
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$AST->selectClause->isDistinct = true; |
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if ( ! isset($AST->orderByClause)) { |
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return; |
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} |
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foreach ($AST->orderByClause->orderByItems as $item) { |
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if ($item->expression instanceof PathExpression) { |
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$AST->selectClause->selectExpressions[] = new SelectExpression( |
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$this->createSelectExpressionItem($item->expression), '_dctrn_ord' . $this->_aliasCounter++ |
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); |
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continue; |
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} |
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if (is_string($item->expression) && isset($queryComponents[$item->expression])) { |
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$qComp = $queryComponents[$item->expression]; |
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if (isset($qComp['resultVariable'])) { |
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$AST->selectClause->selectExpressions[] = new SelectExpression( |
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$qComp['resultVariable'], |
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$item->expression |
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); |
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} |
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} |
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} |
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} |
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/** |
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* Validate the AST to ensure that this walker is able to properly manipulate it. |
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* |
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* @param SelectStatement $AST |
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*/ |
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private function validate(SelectStatement $AST) |
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{ |
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// Prevent LimitSubqueryWalker from being used with queries that include |
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// a limit, a fetched to-many join, and an order by condition that |
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// references a column from the fetch joined table. |
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$queryComponents = $this->getQueryComponents(); |
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$query = $this->_getQuery(); |
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$from = $AST->fromClause->identificationVariableDeclarations; |
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$fromRoot = reset($from); |
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if ($query instanceof Query |
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&& null !== $query->getMaxResults() |
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&& $AST->orderByClause |
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&& count($fromRoot->joins)) { |
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// Check each orderby item. |
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// TODO: check complex orderby items too... |
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foreach ($AST->orderByClause->orderByItems as $orderByItem) { |
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$expression = $orderByItem->expression; |
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if ($orderByItem->expression instanceof PathExpression |
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&& isset($queryComponents[$expression->identificationVariable])) { |
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$queryComponent = $queryComponents[$expression->identificationVariable]; |
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if (isset($queryComponent['parent']) |
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&& $queryComponent['relation']['type'] & ClassMetadataInfo::TO_MANY) { |
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throw new \RuntimeException("Cannot select distinct identifiers from query with LIMIT and ORDER BY on a column from a fetch joined to-many association. Use output walkers."); |
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} |
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} |
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} |
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} |
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} |
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/** |
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* Retrieve either an IdentityFunction (IDENTITY(u.assoc)) or a state field (u.name). |
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* |
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* @param \Doctrine\ORM\Query\AST\PathExpression $pathExpression |
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* |
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* @return \Doctrine\ORM\Query\AST\Functions\IdentityFunction |
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*/ |
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private function createSelectExpressionItem(PathExpression $pathExpression) |
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{ |
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if ($pathExpression->type === PathExpression::TYPE_SINGLE_VALUED_ASSOCIATION) { |
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1 |
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$identity = new IdentityFunction('identity'); |
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$identity->pathExpression = clone $pathExpression; |
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return $identity; |
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} |
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return clone $pathExpression; |
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} |
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} |
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doctrine /
orm
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