81 lines
3.2 KiB
PHP
81 lines
3.2 KiB
PHP
<?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 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\Id;
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use Doctrine\ORM\EntityManager;
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/**
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* Id generator that uses a single-row database table and a hi/lo algorithm.
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*
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* @since 2.0
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* @author Benjamin Eberlei <kontakt@beberlei.de>
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* @author Guilherme Blanco <guilhermeblanco@hotmail.com>
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* @author Jonathan Wage <jonwage@gmail.com>
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* @author Roman Borschel <roman@code-factory.org>
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*/
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class TableGenerator extends AbstractIdGenerator
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{
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private $_tableName;
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private $_sequenceName;
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private $_allocationSize;
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private $_nextValue;
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private $_maxValue;
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public function __construct($tableName, $sequenceName = 'default', $allocationSize = 10)
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{
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$this->_tableName = $tableName;
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$this->_sequenceName = $sequenceName;
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$this->_allocationSize = $allocationSize;
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}
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public function generate(EntityManager $em, $entity)
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{
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if ($this->_maxValue === null || $this->_nextValue == $this->_maxValue) {
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// Allocate new values
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$conn = $em->getConnection();
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if ($conn->getTransactionNestingLevel() === 0) {
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// use select for update
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$sql = $conn->getDatabasePlatform()->getTableHiLoCurrentValSql($this->_tableName, $this->_sequenceName);
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$currentLevel = $conn->fetchColumn($sql);
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if ($currentLevel != null) {
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$this->_nextValue = $currentLevel;
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$this->_maxValue = $this->_nextValue + $this->_allocationSize;
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$updateSql = $conn->getDatabasePlatform()->getTableHiLoUpdateNextValSql(
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$this->_tableName, $this->_sequenceName, $this->_allocationSize
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);
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if ($conn->executeUpdate($updateSql, array(1 => $currentLevel, 2 => $currentLevel+1)) !== 1) {
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// no affected rows, concurrency issue, throw exception
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}
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} else {
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// no current level returned, TableGenerator seems to be broken, throw exception
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}
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} else {
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// only table locks help here, implement this or throw exception?
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// or do we want to work with table locks exclusively?
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}
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}
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return $this->_nextValue++;
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}
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} |