В первой части статьи была описана концепция программной архитектуры MVC, рассмотрена структура типового веб-приложения, базирующегося на Zend Framework и выполнена демонстрационная реализация контроллера и вида на его основе. Во второй части будет раскрыта тема модели и приведен пример взаимодействия приложения с базой данных.

База данных

Настройка

[general]
db.adapter = PDO_MYSQL
db.config.host = localhost
db.config.username = rob
db.config.password = 123456
db.config.dbname = zftest

$config = new Zend_Config_Ini('config.ini', 'section');

...
Zend_Loader::loadClass('Zend_Controller_Front');
Zend_Loader::loadClass('Zend_Config_Ini');
Zend_Loader::loadClass('Zend_Registry');

// load configuration
$config = new Zend_Config_Ini('./application/config.ini', 'general');
$registry = Zend_Registry::getInstance();
$registry->set('config', $config);

// setup controller
...

Использование Zend_Db_Table

...
Zend_Loader::loadClass('Zend_Controller_Front');
Zend_Loader::loadClass('Zend_Config_Ini');
Zend_Loader::loadClass('Zend_Registry');
Zend_Loader::loadClass('Zend_Db');
Zend_Loader::loadClass('Zend_Db_Table');

// load configuration
$config = new Zend_Config_Ini('./application/config.ini', 'general');
$registry = Zend_Registry::getInstance();
$registry->set('config', $config);

// setup database
$db = Zend_Db::factory($config->db->adapter,
$config->db->config->toArray());
Zend_Db_Table::setDefaultAdapter($db);

// setup controller
...

Создание таблицы

CREATE TABLE album (
    id int(11) NOT NULL auto_increment,
    artist varchar(100) NOT NULL,
    title varchar(100) NOT NULL,
    PRIMARY KEY (id)
);

Добавление тестовой записи

INSERT INTO album (artist, title)
VALUES
    ('James Morrison', 'Undiscovered'),
    ('Snow Patrol', 'Eyes Open');

Модель

<?php

class Album extends Zend_Db_Table
{
    protected $_name = 'album';
}

Список альбомов

...
function init()
{
    $this->view->baseUrl = $this->_request->getBaseUrl();
    Zend_Loader::loadClass('Album');
}
...

...
function indexAction()
{
    $this->view->title = "My Albums";
    $album = new Album();
    $this->view->albums = $album->fetchAll();
}
...

<?php echo $this->render('header.phtml'); ?>
<h1><?php echo $this->escape($this->title); ?></h1>
<p><a href="<?php echo $this->baseUrl; ?>/index/add">Add new album</a></p>
<table>
<tr>
<th>Title</th>
<th>Artist</th>
<th> </th>
</tr>
<?php foreach($this->albums as $album) : ?>
<tr>
<td><?php echo $this->escape($album->title);?></td>
<td><?php echo $this->escape($album->artist);?></td>
<td>
<a href="<?php echo $this->baseUrl; ?>/index/edit/id/<?php
echo $album->id;?>">Edit</a>
<a href="<?php echo $this->baseUrl; ?>/index/delete/id/<?php
echo $album->id;?>">Delete</a>
</td>
</tr>
<?php endforeach; ?>
</table>
<?php echo $this->render('footer.phtml'); ?>

Добавление нового альбома

• отображение формы, через которую пользователь будет вводить данные;
• добавление принятых из формы данных в базу.

...
function addAction()
{
    $this->view->title = "Add New Album";

    if ($this->_request->isPost()) {
        Zend_Loader::loadClass('Zend_Filter_StripTags');
        $filter = new Zend_Filter_StripTags();
        $artist = $filter->filter($this->_request->getPost('artist'));
        $artist = trim($artist);
        $title = trim($filter->filter($this->_request->getPost('title')));

        if ($artist != '' && $title != '') {
            $data = array(
                'artist' => $artist,
                'title' => $title,
            );
            $album = new Album();
            $album->insert($data);
            $this->_            redirect('/');
            return;
        }
    }

    // set up an "empty" album
    $this->view->album = new stdClass();
    $this->view->album->id = null;
    $this->view->album->artist = '';
    $this->view->album->title = '';

    // additional view fields required by form
    $this->view->action = 'add';
    $this->view->buttonText = 'Add';
}
...

<?php echo $this->render('header.phtml'); ?>
<h1><?php echo $this->escape($this->title); ?></h1>
<?php echo $this->render('index/_form.phtml'); ?>
<?php echo $this->render('footer.phtml'); ?>

<form action="<?php echo $this->baseUrl ?>/index/<?php
echo $this->action; ?>" method="post">
<div>
<label for="artist">Artist</label>
<input type="text" name="artist"
value="<?php echo $this->escape(trim($this->album->artist));?>"/>
</div>
<div>
<label for="title">Title</label>
<input type="text" name="title"
value="<?php echo $this->escape($this->album->title);?>"/>
</div>
<div id="formbutton">
<input type="hidden" name="id" value="<?php echo $this->album->id; ?>" />
<input type="submit" name="add"
value="<?php echo $this->escape($this->buttonText); ?>" />
</div>
</form>

Редактирование альбома

...
function editAction()
{
    $this->view->title = "Edit Album";
    $album = new Album();

    if ($this->_request->isPost()) {
        Zend_Loader::loadClass('Zend_Filter_StripTags');
        $filter = new Zend_Filter_StripTags();
        $id = (int)$this->_request->getPost('id');
        $artist = $filter->filter($this->_request->getPost('artist'));
        $artist = trim($artist);
        $title = trim($filter->filter($this->_request->getPost('title')));

        if ($id !== false) {
            if ($artist != '' && $title != '') {

                $data = array(
                    'artist' => $artist,
                    'title' => $title,
                );

                $where = 'id = ' . $id;
                $album->update($data, $where);
                $this->_redirect('/');
                return;
            } else {
                $this->view->album = $album->fetchRow('id='.$id);
            }
        }
    } else {
        // album id should be $params['id']
        $id = (int)$this->_request->getParam('id', 0);

        if ($id > 0) {
            $this->view->album = $album->fetchRow('id='.$id);
        }
    }

    // additional view fields required by form
    $this->view->action = 'edit';
    $this->view->buttonText = 'Update';
}
...

<?php echo $this->render('header.phtml'); ?>
<h1><?php echo $this->escape($this->title); ?></h1>
<?php echo $this->render('index/_form.phtml'); ?>
<?php echo $this->render('footer.phtml'); ?>

Рефакторинг

Удаление альбома

...
function deleteAction()
{
    $this->view->title = "Delete Album";
    $album = new Album();

    if ($this->_request->isPost()) {
        Zend_Loader::loadClass('Zend_Filter_Alpha');
        $filter = new Zend_Filter_Alpha();
        $id = (int)$this->_request->getPost('id');
        $del = $filter->filter($this->_request->getPost('del'));

        if ($del == 'Yes' && $id > 0) {
            $where = 'id = ' . $id;
            $rows_affected = $album->delete($where);
        }
    } else {
        $id = (int)$this->_request->getParam('id');

        if ($id > 0) {
            // only render if we have an id and can find the album.
            $this->view->album = $album->fetchRow('id='.$id);

            if ($this->view->album->id > 0) {
                // render template automatically
                return;
            }
        }
    }

    // redirect back to the album list unless we have rendered the view
    $this->_redirect('/');
}
...

<?php echo $this->render('header.phtml'); ?>
<h1><?php echo $this->escape($this->title); ?></h1>
<?php if ($this->album) :?>
<form action="<?php echo $this->baseUrl ?>/index/delete" method="post">
<p>Are you sure that you want to delete
    '<?php echo $this->escape($this->album->title); ?>' by
    '<?php echo $this->escape($this->album->artist); ?>'?
</p>
<div>
    <input type="hidden" name="id"
        value="<?php echo $this->album->id; ?>" />
    <input type="submit" name="del" value="Yes" />
    <input type="submit" name="del" value="No" />
</div>
</form>
<?php else: ?>
<p>Cannot find album.</p>
<?php endif;?>
<?php echo $this->render('footer.phtml'); ?>

Устранение неполадок

...
// setup controller
$frontController = Zend_Controller_Front::getInstance();
$frontController->throwExceptions(true);
$frontController->setBaseUrl('/mysubdir/zf-tutorial');
$frontController->setControllerDirectory('./application/controllers');
...

Заключение