366 lines
14 KiB
PHP
366 lines
14 KiB
PHP
<?php
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/*
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* $Id: Hydrate.php 3192 2007-11-19 17:55:23Z romanb $
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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 LGPL. For more information, see
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* <http://www.doctrine-project.org>.
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*/
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namespace Doctrine\ORM\Internal\Hydration;
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use \PDO;
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/**
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* Base class for all hydrators (ok, we got only 1 currently).
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*
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* @license http://www.opensource.org/licenses/lgpl-license.php LGPL
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* @link www.doctrine-project.org
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* @since 2.0
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* @version $Revision: 3192 $
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* @author Konsta Vesterinen <kvesteri@cc.hut.fi>
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* @author Roman Borschel <roman@code-factory.org>
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*/
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abstract class AbstractHydrator
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{
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/**
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* @var array $_queryComponents
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*
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* Two dimensional array containing the map for query aliases. Main keys are component aliases.
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*
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* metadata ClassMetadata object associated with given alias.
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* relation Relation object owned by the parent.
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* parent Alias of the parent.
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* agg Aggregates of this component.
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* map Name of the column / aggregate value this component is mapped to in a collection.
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*/
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protected $_queryComponents = array();
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/** @var array Table alias map. Keys are SQL aliases and values DQL aliases. */
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protected $_tableAliases = array();
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/** @var EntityManager The EntityManager instance. */
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protected $_em;
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/** @var UnitOfWork The UnitOfWork of the associated EntityManager. */
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protected $_uow;
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/** @var array The cache used during row-by-row hydration. */
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protected $_cache = array();
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/** @var Statement The statement that provides the data to hydrate. */
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protected $_stmt;
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/** @var object The ParserResult instance that holds the necessary information for hydration. */
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protected $_parserResult;
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/**
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* Initializes a new instance of a class derived from AbstractHydrator.
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*
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* @param Doctrine\ORM\EntityManager $em The EntityManager to use.
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*/
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public function __construct(\Doctrine\ORM\EntityManager $em)
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{
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$this->_em = $em;
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$this->_uow = $em->getUnitOfWork();
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}
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/**
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* Initiates a row-by-row hydration.
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*
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* @param object $stmt
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* @param object $parserResult
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* @return IterableResult
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*/
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public function iterate($stmt, $parserResult)
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{
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$this->_stmt = $stmt;
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$this->_prepare($parserResult);
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return new IterableResult($this);
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}
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/**
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* Hydrates all rows returned by the passed statement instance at once.
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*
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* @param object $stmt
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* @param object $parserResult
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* @return mixed
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*/
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public function hydrateAll($stmt, $parserResult)
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{
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$this->_stmt = $stmt;
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$this->_prepare($parserResult);
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$result = $this->_hydrateAll();
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$this->_cleanup();
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return $result;
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}
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/**
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* Hydrates a single row returned by the current statement instance during
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* row-by-row hydration with {@link iterate()}.
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*
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* @return mixed
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*/
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public function hydrateRow()
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{
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$row = $this->_stmt->fetch(PDO::FETCH_ASSOC);
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if ( ! $row) {
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$this->_cleanup();
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return false;
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}
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$result = $this->_getRowContainer();
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$this->_hydrateRow($row, $this->_cache, $result);
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return $result;
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}
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/**
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* Excutes one-time preparation tasks once each time hydration is started
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* through {@link hydrateAll} or {@link iterate()}.
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*
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* @param object $parserResult
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*/
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protected function _prepare($parserResult)
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{
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$this->_queryComponents = $parserResult->getQueryComponents();
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$this->_tableAliases = $parserResult->getTableAliasMap();
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$this->_parserResult = $parserResult;
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}
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/**
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* Excutes one-time cleanup tasks at the end of a hydration that was initiated
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* through {@link hydrateAll} or {@link iterate()}.
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*/
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protected function _cleanup()
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{
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$this->_parserResult = null;
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$this->_stmt->closeCursor();
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$this->_stmt = null;
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}
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/**
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* Hydrates a single row from the current statement instance.
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*
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* Template method.
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*
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* @param array $data The row data.
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* @param array $cache The cache to use.
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* @param mixed $result The result to fill.
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*/
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protected function _hydrateRow(array &$data, array &$cache, &$result)
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{}
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/**
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* Hydrates all rows from the current statement instance at once.
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*
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* @param object $parserResult
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*/
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abstract protected function _hydrateAll();
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/**
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* Gets the row container used during row-by-row hydration through {@link iterate()}.
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*/
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abstract protected function _getRowContainer();
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/**
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* Processes a row of the result set.
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* Used for identity hydration (HYDRATE_IDENTITY_OBJECT and HYDRATE_IDENTITY_ARRAY).
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* Puts the elements of a result row into a new array, grouped by the class
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* they belong to. The column names in the result set are mapped to their
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* field names during this procedure as well as any necessary conversions on
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* the values applied.
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*
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* @return array An array with all the fields (name => value) of the data row,
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* grouped by their component (alias).
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*/
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protected function _gatherRowData(&$data, &$cache, &$id, &$nonemptyComponents)
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{
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$rowData = array();
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foreach ($data as $key => $value) {
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// Parse each column name only once. Cache the results.
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if ( ! isset($cache[$key])) {
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if ($this->_isIgnoredName($key)) continue;
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// Cache general information like the column name <-> field name mapping
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$e = explode(\Doctrine\ORM\Query\ParserRule::SQLALIAS_SEPARATOR, $key);
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$columnName = array_pop($e);
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$cache[$key]['dqlAlias'] = $this->_tableAliases[
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implode(\Doctrine\ORM\Query\ParserRule::SQLALIAS_SEPARATOR, $e)
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];
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$classMetadata = $this->_queryComponents[$cache[$key]['dqlAlias']]['metadata'];
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// check whether it's an aggregate value or a regular field
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if (isset($this->_queryComponents[$cache[$key]['dqlAlias']]['agg'][$columnName])) {
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$fieldName = $this->_queryComponents[$cache[$key]['dqlAlias']]['agg'][$columnName];
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$cache[$key]['isScalar'] = true;
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} else {
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$fieldName = $this->_lookupFieldName($classMetadata, $columnName);
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$cache[$key]['isScalar'] = false;
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$cache[$key]['type'] = $classMetadata->getTypeOfColumn($columnName);
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}
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$cache[$key]['fieldName'] = $fieldName;
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// Cache identifier information
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$cache[$key]['isIdentifier'] = $classMetadata->isIdentifier($fieldName);
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/*if ($classMetadata->isIdentifier($fieldName)) {
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$cache[$key]['isIdentifier'] = true;
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} else {
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$cache[$key]['isIdentifier'] = false;
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}*/
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}
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$class = $this->_queryComponents[$cache[$key]['dqlAlias']]['metadata'];
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$dqlAlias = $cache[$key]['dqlAlias'];
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$fieldName = $cache[$key]['fieldName'];
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if ($cache[$key]['isScalar']) {
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$rowData['scalars'][$fieldName] = $value;
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continue;
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}
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if ($cache[$key]['isIdentifier']) {
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$id[$dqlAlias] .= '|' . $value;
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}
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$rowData[$dqlAlias][$fieldName] = $cache[$key]['type']->convertToPHPValue($value);
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if ( ! isset($nonemptyComponents[$dqlAlias]) && $value !== null) {
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$nonemptyComponents[$dqlAlias] = true;
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}
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}
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return $rowData;
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}
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/**
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* Processes a row of the result set.
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* Used for HYDRATE_SCALAR. This is a variant of _gatherRowData() that
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* simply converts column names to field names and properly prepares the
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* values. The resulting row has the same number of elements as before.
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*
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* @param array $data
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* @param array $cache
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* @return array The processed row.
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*/
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protected function _gatherScalarRowData(&$data, &$cache)
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{
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$rowData = array();
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foreach ($data as $key => $value) {
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// Parse each column name only once. Cache the results.
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if ( ! isset($cache[$key])) {
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if ($this->_isIgnoredName($key)) continue;
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// cache general information like the column name <-> field name mapping
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$e = explode(\Doctrine\ORM\Query\ParserRule::SQLALIAS_SEPARATOR, $key);
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$columnName = array_pop($e);
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$cache[$key]['dqlAlias'] = $this->_tableAliases[
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implode(\Doctrine\ORM\Query\ParserRule::SQLALIAS_SEPARATOR, $e)
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];
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$classMetadata = $this->_queryComponents[$cache[$key]['dqlAlias']]['metadata'];
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// check whether it's an aggregate value or a regular field
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if (isset($this->_queryComponents[$cache[$key]['dqlAlias']]['agg'][$columnName])) {
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$fieldName = $this->_queryComponents[$cache[$key]['dqlAlias']]['agg'][$columnName];
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$cache[$key]['isScalar'] = true;
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} else {
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$fieldName = $this->_lookupFieldName($classMetadata, $columnName);
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$cache[$key]['isScalar'] = false;
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// cache type information
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$cache[$key]['type'] = $classMetadata->getTypeOfColumn($columnName);
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}
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$cache[$key]['fieldName'] = $fieldName;
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}
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$class = $this->_queryComponents[$cache[$key]['dqlAlias']]['metadata'];
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$dqlAlias = $cache[$key]['dqlAlias'];
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$fieldName = $cache[$key]['fieldName'];
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if ($cache[$key]['isScalar']) {
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$rowData[$dqlAlias . '_' . $fieldName] = $value;
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} else {
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$rowData[$dqlAlias . '_' . $fieldName] = $cache[$key]['type']->convertToPHPValue($value);
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}
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}
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return $rowData;
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}
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/**
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* Gets the custom field used for indexing for the specified DQL alias.
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*
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* @return string The field name of the field used for indexing or NULL
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* if the component does not use any custom field indices.
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*/
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protected function _getCustomIndexField($alias)
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{
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return isset($this->_queryComponents[$alias]['map']) ? $this->_queryComponents[$alias]['map'] : null;
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}
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/**
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* Checks whether a name is ignored. Used during result set parsing to skip
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* certain elements in the result set that do not have any meaning for the result.
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* (I.e. ORACLE limit/offset emulation adds doctrine_rownum to the result set).
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*
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* @param string $name
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* @return boolean
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*/
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private function _isIgnoredName($name)
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{
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return $name == 'doctrine_rownum';
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}
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/**
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* Looks up the field name for a (lowercased) column name.
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*
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* This is mostly used during hydration, because we want to make the
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* conversion to field names while iterating over the result set for best
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* performance. By doing this at that point, we can avoid re-iterating over
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* the data just to convert the column names to field names.
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*
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* However, when this is happening, we don't know the real
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* class name to instantiate yet (the row data may target a sub-type), hence
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* this method looks up the field name in the subclass mappings if it's not
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* found on this class mapping.
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* This lookup on subclasses is costly but happens only *once* for a column
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* during hydration because the hydrator caches effectively.
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*
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* @return string The field name.
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* @throws DoctrineException If the field name could not be found.
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*/
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private function _lookupFieldName($class, $lcColumnName)
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{
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if ($class->hasLowerColumn($lcColumnName)) {
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return $class->getFieldNameForLowerColumnName($lcColumnName);
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}
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foreach ($class->getSubclasses() as $subClass) {
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$subClassMetadata = Doctrine_ORM_Mapping_ClassMetadataFactory::getInstance()
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->getMetadataFor($subClass);
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if ($subClassMetadata->hasLowerColumn($lcColumnName)) {
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return $subClassMetadata->getFieldNameForLowerColumnName($lcColumnName);
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}
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}
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throw new DoctrineException("No field name found for column name '$lcColumnName' during hydration.");
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}
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/** Needed only temporarily until the new parser is ready */
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private $_isResultMixed = false;
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public function setResultMixed($bool)
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{
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$this->_isResultMixed = $bool;
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}
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}
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