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<?php
declare(strict_types=1);
namespace Doctrine\ORM\Tools\Pagination;
use Doctrine\ORM\Query\AST\AggregateExpression;
use Doctrine\ORM\Query\AST\PathExpression;
use Doctrine\ORM\Query\AST\SelectExpression;
use Doctrine\ORM\Query\AST\SelectStatement;
use Doctrine\ORM\Query\TreeWalkerAdapter;
use RuntimeException;
use function count;
use function reset;
/**
* Replaces the selectClause of the AST with a COUNT statement.
*/
class CountWalker extends TreeWalkerAdapter
{
/**
* Distinct mode hint name.
*/
public const HINT_DISTINCT = 'doctrine_paginator.distinct';
public function walkSelectStatement(SelectStatement $selectStatement): void
{
if ($selectStatement->havingClause) {
throw new RuntimeException('Cannot count query that uses a HAVING clause. Use the output walkers for pagination');
}
// Get the root entity and alias from the AST fromClause
$from = $selectStatement->fromClause->identificationVariableDeclarations;
if (count($from) > 1) {
throw new RuntimeException('Cannot count query which selects two FROM components, cannot make distinction');
}
$fromRoot = reset($from);
$rootAlias = $fromRoot->rangeVariableDeclaration->aliasIdentificationVariable;
$rootClass = $this->getMetadataForDqlAlias($rootAlias);
$identifierFieldName = $rootClass->getSingleIdentifierFieldName();
$pathType = PathExpression::TYPE_STATE_FIELD;
if (isset($rootClass->associationMappings[$identifierFieldName])) {
$pathType = PathExpression::TYPE_SINGLE_VALUED_ASSOCIATION;
}
$pathExpression = new PathExpression(
PathExpression::TYPE_STATE_FIELD | PathExpression::TYPE_SINGLE_VALUED_ASSOCIATION,
$rootAlias,
$identifierFieldName,
);
$pathExpression->type = $pathType;
$distinct = $this->_getQuery()->getHint(self::HINT_DISTINCT);
$selectStatement->selectClause->selectExpressions = [
new SelectExpression(
new AggregateExpression('count', $pathExpression, $distinct),
null,
),
];
// ORDER BY is not needed, only increases query execution through unnecessary sorting.
$selectStatement->orderByClause = null;
}
}
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