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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\SqlWalker; |
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use Doctrine\ORM\Query\AST\SelectStatement; |
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/** |
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* Wraps the query in order to accurately count the root objects. |
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* |
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* Given a DQL like `SELECT u FROM User u` it will generate an SQL query like: |
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* SELECT COUNT(*) (SELECT DISTINCT <id> FROM (<original SQL>)) |
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* |
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* Works with composite keys but cannot deal with queries that have multiple |
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* root entities (e.g. `SELECT f, b from Foo, Bar`) |
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* |
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* @author Sander Marechal <[email protected]> |
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*/ |
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class CountOutputWalker extends SqlWalker |
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{ |
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/** |
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* @var \Doctrine\DBAL\Platforms\AbstractPlatform |
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*/ |
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private $platform; |
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/** |
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* @var \Doctrine\ORM\Query\ResultSetMapping |
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*/ |
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private $rsm; |
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/** |
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* @var array |
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*/ |
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private $queryComponents; |
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/** |
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* Constructor. |
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* |
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* Stores various parameters that are otherwise unavailable |
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* because Doctrine\ORM\Query\SqlWalker keeps everything private without |
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* accessors. |
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* |
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* @param \Doctrine\ORM\Query $query |
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* @param \Doctrine\ORM\Query\ParserResult $parserResult |
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* @param array $queryComponents |
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*/ |
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public function __construct($query, $parserResult, array $queryComponents) |
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{ |
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$this->platform = $query->getEntityManager()->getConnection()->getDatabasePlatform(); |
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$this->rsm = $parserResult->getResultSetMapping(); |
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$this->queryComponents = $queryComponents; |
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parent::__construct($query, $parserResult, $queryComponents); |
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} |
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/** |
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* Walks down a SelectStatement AST node, wrapping it in a COUNT (SELECT DISTINCT). |
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* |
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* Note that the ORDER BY clause is not removed. Many SQL implementations (e.g. MySQL) |
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* are able to cache subqueries. By keeping the ORDER BY clause intact, the limitSubQuery |
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* that will most likely be executed next can be read from the native SQL cache. |
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* |
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* @param SelectStatement $AST |
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* |
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* @return string |
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* |
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* @throws \RuntimeException |
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*/ |
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public function walkSelectStatement(SelectStatement $AST) |
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{ |
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if ($this->platform->getName() === "mssql") { |
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$AST->orderByClause = null; |
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} |
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$sql = parent::walkSelectStatement($AST); |
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if ($AST->groupByClause) { |
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return sprintf( |
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'SELECT %s AS dctrn_count FROM (%s) dctrn_table', |
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$this->platform->getCountExpression('*'), |
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$sql |
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); |
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} |
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// Find out the SQL alias of the identifier column of the root entity |
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// It may be possible to make this work with multiple root entities but that |
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// would probably require issuing multiple queries or doing a UNION SELECT |
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// so for now, It's not supported. |
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// Get the root entity and alias from the AST fromClause |
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10 |
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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 = $this->queryComponents[$rootAlias]['metadata']; |
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$rootIdentifier = $rootClass->identifier; |
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// For every identifier, find out the SQL alias by combing through the ResultSetMapping |
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$sqlIdentifier = []; |
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View Code Duplication |
foreach ($rootIdentifier as $property) { |
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if (isset($rootClass->fieldMappings[$property])) { |
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foreach (array_keys($this->rsm->fieldMappings, $property) as $alias) { |
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if ($this->rsm->columnOwnerMap[$alias] == $rootAlias) { |
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$sqlIdentifier[$property] = $alias; |
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} |
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} |
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} |
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if (isset($rootClass->associationMappings[$property])) { |
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$joinColumn = $rootClass->associationMappings[$property]['joinColumns'][0]['name']; |
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foreach (array_keys($this->rsm->metaMappings, $joinColumn) as $alias) { |
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if ($this->rsm->columnOwnerMap[$alias] == $rootAlias) { |
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$sqlIdentifier[$property] = $alias; |
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} |
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} |
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} |
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} |
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View Code Duplication |
if (count($rootIdentifier) != count($sqlIdentifier)) { |
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throw new \RuntimeException(sprintf( |
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'Not all identifier properties can be found in the ResultSetMapping: %s', |
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implode(', ', array_diff($rootIdentifier, array_keys($sqlIdentifier))) |
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)); |
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} |
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// Build the counter query |
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return sprintf('SELECT %s AS dctrn_count FROM (SELECT DISTINCT %s FROM (%s) dctrn_result) dctrn_table', |
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$this->platform->getCountExpression('*'), |
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implode(', ', $sqlIdentifier), |
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$sql |
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); |
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} |
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} |
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doctrine /
orm
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