Doctrine\ORM\UnitOfWork::commit PHP Method

    public function commit()
    {
        // Compute changes done since last commit.
        $this->computeChangeSets();

        if ( ! ($this->entityInsertions ||
                $this->entityDeletions ||
                $this->entityUpdates ||
                $this->collectionUpdates ||
                $this->collectionDeletions ||
                $this->orphanRemovals)) {
            return; // Nothing to do.
        }

        if ($this->orphanRemovals) {
            foreach ($this->orphanRemovals as $orphan) {
                $this->remove($orphan);
            }
        }
        
        // Raise onFlush
        if ($this->evm->hasListeners(Events::onFlush)) {
            $this->evm->dispatchEvent(Events::onFlush, new Event\OnFlushEventArgs($this->em));
        }
        
        // Now we need a commit order to maintain referential integrity
        $commitOrder = $this->getCommitOrder();

        $conn = $this->em->getConnection();

        $conn->beginTransaction();
        try {
            if ($this->entityInsertions) {
                foreach ($commitOrder as $class) {
                    $this->executeInserts($class);
                }
            }

            if ($this->entityUpdates) {
                foreach ($commitOrder as $class) {
                    $this->executeUpdates($class);
                }
            }

            // Extra updates that were requested by persisters.
            if ($this->extraUpdates) {
                $this->executeExtraUpdates();
            }

            // Collection deletions (deletions of complete collections)
            foreach ($this->collectionDeletions as $collectionToDelete) {
                $this->getCollectionPersister($collectionToDelete->getMapping())
                        ->delete($collectionToDelete);
            }
            // Collection updates (deleteRows, updateRows, insertRows)
            foreach ($this->collectionUpdates as $collectionToUpdate) {
                $this->getCollectionPersister($collectionToUpdate->getMapping())
                        ->update($collectionToUpdate);
            }

            // Entity deletions come last and need to be in reverse commit order
            if ($this->entityDeletions) {
                for ($count = count($commitOrder), $i = $count - 1; $i >= 0; --$i) {
                    $this->executeDeletions($commitOrder[$i]);
                }
            }

            $conn->commit();
        } catch (Exception $e) {
            $this->em->close();
            $conn->rollback();
            throw $e;
        }

        // Take new snapshots from visited collections
        foreach ($this->visitedCollections as $coll) {
            $coll->takeSnapshot();
        }

        // Clear up
        $this->entityInsertions =
        $this->entityUpdates =
        $this->entityDeletions =
        $this->extraUpdates =
        $this->entityChangeSets =
        $this->collectionUpdates =
        $this->collectionDeletions =
        $this->visitedCollections =
        $this->scheduledForDirtyCheck =
        $this->orphanRemovals = array();
    }

 /**
  * Flushes all changes to objects that have been queued up to now to the database.
  * This effectively synchronizes the in-memory state of managed objects with the
  * database.
  *
  * If an entity is explicitly passed to this method only this entity and
  * the cascade-persist semantics + scheduled inserts/removals are synchronized.
  *
  * @param null|object|array $entity
  *
  * @return void
  *
  * @throws \Doctrine\ORM\OptimisticLockException If a version check on an entity that
  *         makes use of optimistic locking fails.
  */
 public function flush($entity = null)
 {
     $this->errorIfClosed();
     $this->unitOfWork->commit($entity);
 }