Example of a controller using a Form to persist data to the DB - http://www.symfonycentral.com

ArticleController.php

<?php 
        /* ... rest of the controller */
        if ($this->getRequest()->getMethod() == 'POST') {
            /* First we 'bind' the postback data to the form */
            $form->bind($this->getRequest()->get('form'));

            if ($form->isValid()) {
                /* Now we get the data as an associative array */
                $formdata = $form->getData();
                
                /* Create the entity and add each of the fields */
                $article = new Post();
                $article->setTitle($formdata['title'])
                        ->setBody($formdata['body']);
                
                /* Persist the object to the database */
                $em = $this->getDoctrine()->getEntityManager();
                $em->persist($article);
                $em->flush();
            }
        }
        /* ... rest of the controller */