368 lines
13 KiB
PHP
368 lines
13 KiB
PHP
<?php
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/*
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* $Id$
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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.phpdoctrine.com>.
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*/
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Doctrine::autoload('Doctrine_Connection_Module');
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/**
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*
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* @author Konsta Vesterinen <kvesteri@cc.hut.fi>
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* @author Lukas Smith <smith@pooteeweet.org> (PEAR MDB2 library)
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* @license http://www.opensource.org/licenses/lgpl-license.php LGPL
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* @package Doctrine
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* @category Object Relational Mapping
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* @link www.phpdoctrine.com
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* @since 1.0
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* @version $Revision$
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*/
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class Doctrine_Transaction extends Doctrine_Connection_Module {
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/**
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* Doctrine_Transaction is in sleep state when it has no active transactions
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*/
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const STATE_SLEEP = 0;
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/**
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* Doctrine_Transaction is in active state when it has one active transaction
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*/
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const STATE_ACTIVE = 1;
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/**
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* Doctrine_Transaction is in busy state when it has multiple active transactions
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*/
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const STATE_BUSY = 2;
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/**
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* @var integer $transactionLevel the nesting level of transactions, used by transaction methods
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*/
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protected $transactionLevel = 0;
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/**
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* @var array $invalid an array containing all invalid records within this transaction
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*/
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protected $invalid = array();
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/**
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* @var array $delete two dimensional pending delete list, the records in
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* this list will be deleted when transaction is committed
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*/
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protected $delete = array();
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/**
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* @var array $savepoints an array containing all savepoints
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*/
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public $savePoints = array();
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/**
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* getState
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* returns the state of this connection
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*
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* @see Doctrine_Connection_Transaction::STATE_* constants
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* @return integer the connection state
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*/
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public function getState() {
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switch($this->transactionLevel) {
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case 0:
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return Doctrine_Transaction::STATE_SLEEP;
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break;
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case 1:
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return Doctrine_Transaction::STATE_ACTIVE;
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break;
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default:
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return Doctrine_Transaction::STATE_BUSY;
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}
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}
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/**
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* adds record into pending delete list
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* @param Doctrine_Record $record
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*/
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public function addDelete(Doctrine_Record $record) {
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$name = $record->getTable()->getComponentName();
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$this->delete[$name][] = $record;
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}
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/**
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* addInvalid
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* adds record into invalid records list
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*
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* @param Doctrine_Record $record
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* @return boolean false if record already existed in invalid records list,
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* otherwise true
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*/
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public function addInvalid(Doctrine_Record $record) {
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if(in_array($record, $this->invalid))
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return false;
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$this->invalid[] = $record;
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return true;
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}
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/**
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* returns the pending delete list
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*
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* @return array
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*/
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public function getDeletes() {
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return $this->delete;
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}
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/**
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* bulkDelete
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* deletes all records from the pending delete list
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*
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* @return void
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*/
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public function bulkDelete() {
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foreach($this->delete as $name => $deletes) {
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$record = false;
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$ids = array();
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foreach($deletes as $k => $record) {
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$ids[] = $record->getIncremented();
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$record->assignIdentifier(false);
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}
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if($record instanceof Doctrine_Record) {
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$params = substr(str_repeat("?, ",count($ids)),0,-2);
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$query = 'DELETE FROM '
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. $record->getTable()->getTableName()
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. ' WHERE '
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. $record->getTable()->getIdentifier()
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. ' IN(' . $params . ')';
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$this->conn->execute($query, $ids);
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}
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}
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$this->delete = array();
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}
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/**
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* getTransactionLevel
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* get the current transaction nesting level
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*
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* @return integer
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*/
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public function getTransactionLevel() {
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return $this->transactionLevel;
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}
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/**
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* beginTransaction
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* Start a transaction or set a savepoint.
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*
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* if trying to set a savepoint and there is no active transaction
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* a new transaction is being started
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*
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* Listeners: onPreTransactionBegin, onTransactionBegin
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*
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* @param string $savepoint name of a savepoint to set
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* @return integer current transaction nesting level
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*/
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public function beginTransaction($savepoint = null) {
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if( ! is_null($savepoint)) {
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$this->beginTransaction();
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$this->savePoints[] = $savepoint;
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$this->createSavePoint($savepoint);
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} else {
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if($this->transactionLevel == 0) {
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$this->conn->getAttribute(Doctrine::ATTR_LISTENER)->onPreTransactionBegin($this->conn);
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$this->conn->getDbh()->beginTransaction();
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$this->conn->getAttribute(Doctrine::ATTR_LISTENER)->onTransactionBegin($this->conn);
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}
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}
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$level = ++$this->transactionLevel;
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return $level;
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}
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/**
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* commit
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* Commit the database changes done during a transaction that is in
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* progress or release a savepoint. This function may only be called when
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* auto-committing is disabled, otherwise it will fail.
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*
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* Listeners: onPreTransactionCommit, onTransactionCommit
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*
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* @param string $savepoint name of a savepoint to release
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* @throws Doctrine_Transaction_Exception if the transaction fails at PDO level
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* @throws Doctrine_Validator_Exception if the transaction fails due to record validations
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* @return boolean false if commit couldn't be performed, true otherwise
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*/
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public function commit($savepoint = null) {
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if($this->transactionLevel == 0)
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return false;
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if ( ! is_null($savepoint)) {
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$this->transactionLevel = $this->removeSavePoints($savepoint);
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$this->releaseSavePoint($savepoint);
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} else {
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if($this->transactionLevel == 1) {
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$this->conn->getAttribute(Doctrine::ATTR_LISTENER)->onPreTransactionCommit($this->conn);
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try {
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$this->bulkDelete();
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} catch(Exception $e) {
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$this->rollback();
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throw new Doctrine_Connection_Transaction_Exception($e->__toString());
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}
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if( ! empty($this->invalid)) {
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$this->rollback();
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$tmp = $this->invalid;
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$this->invalid = array();
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throw new Doctrine_Validator_Exception($tmp);
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}
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$this->conn->getDbh()->commit();
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//$this->conn->unitOfWork->reset();
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$this->conn->getAttribute(Doctrine::ATTR_LISTENER)->onTransactionCommit($this->conn);
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}
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}
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$this->transactionLevel--;
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return true;
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}
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/**
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* rollback
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* Cancel any database changes done during a transaction or since a specific
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* savepoint that is in progress. This function may only be called when
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* auto-committing is disabled, otherwise it will fail. Therefore, a new
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* transaction is implicitly started after canceling the pending changes.
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*
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* this method listens to onPreTransactionRollback and onTransactionRollback
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* eventlistener methods
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*
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* @param string $savepoint name of a savepoint to rollback to
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* @return boolean false if rollback couldn't be performed, true otherwise
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*/
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public function rollback($savepoint = null) {
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if($this->transactionLevel == 0)
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return false;
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$this->conn->getAttribute(Doctrine::ATTR_LISTENER)->onPreTransactionRollback($this->conn);
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if( ! is_null($savepoint)) {
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$this->transactionLevel = $this->removeSavePoints($savepoint);
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$this->rollbackSavePoint($savepoint);
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} else {
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//$this->conn->unitOfWork->reset();
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$this->deteles = array();
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$this->transactionLevel = 0;
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$this->conn->getDbh()->rollback();
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}
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$this->conn->getAttribute(Doctrine::ATTR_LISTENER)->onTransactionRollback($this->conn);
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return true;
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}
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/**
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* releaseSavePoint
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* creates a new savepoint
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*
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* @param string $savepoint name of a savepoint to create
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* @return void
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*/
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protected function createSavePoint($savepoint) {
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throw new Doctrine_Transaction_Exception('Savepoints not supported by this driver.');
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}
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/**
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* releaseSavePoint
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* releases given savepoint
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*
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* @param string $savepoint name of a savepoint to release
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* @return void
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*/
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protected function releaseSavePoint($savepoint) {
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throw new Doctrine_Transaction_Exception('Savepoints not supported by this driver.');
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}
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/**
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* rollbackSavePoint
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* releases given savepoint
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*
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* @param string $savepoint name of a savepoint to rollback to
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* @return void
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*/
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protected function rollbackSavePoint($savepoint) {
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throw new Doctrine_Transaction_Exception('Savepoints not supported by this driver.');
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}
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/**
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* removeSavePoints
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* removes a savepoint from the internal savePoints array of this transaction object
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* and all its children savepoints
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*
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* @param sring $savepoint name of the savepoint to remove
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* @return integer the current transaction level
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*/
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private function removeSavePoints($savepoint) {
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$i = array_search($savepoint, $this->savePoints);
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$c = count($this->savePoints);
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for($x = $i; $x < count($this->savePoints); $x++) {
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unset($this->savePoints[$x]);
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}
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return ($c - $i);
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}
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/**
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* setIsolation
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*
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* Set the transacton isolation level.
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* (implemented by the connection drivers)
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*
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* example:
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*
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* <code>
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* $tx->setIsolation('READ UNCOMMITTED');
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* </code>
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*
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* @param string standard isolation level
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* READ UNCOMMITTED (allows dirty reads)
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* READ COMMITTED (prevents dirty reads)
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* REPEATABLE READ (prevents nonrepeatable reads)
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* SERIALIZABLE (prevents phantom reads)
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*
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* @throws Doctrine_Transaction_Exception if the feature is not supported by the driver
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* @throws PDOException if something fails at the PDO level
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* @return void
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*/
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public function setIsolation($isolation) {
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throw new Doctrine_Transaction_Exception('Transaction isolation levels not supported by this driver.');
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}
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/**
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* getTransactionIsolation
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*
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* fetches the current session transaction isolation level
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*
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* note: some drivers may support setting the transaction isolation level
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* but not fetching it
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*
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* @throws Doctrine_Transaction_Exception if the feature is not supported by the driver
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* @throws PDOException if something fails at the PDO level
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* @return string returns the current session transaction isolation level
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*/
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public function getIsolation() {
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throw new Doctrine_Transaction_Exception('Fetching transaction isolation level not supported by this driver.');
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}
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}
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