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Ô­ÎÄ £º http://manual.cakephp.org/chapter/20

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http://1000copy.itpub.net/resource/10379/16626

The Cake Blog Tutorial
Section 1

-----------------
/* First, create our posts table: */
-----------------
CREATE TABLE posts (
id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
title VARCHAR(50),
body TEXT,
created DATETIME DEFAULT NULL,
modified DATETIME DEFAULT NULL
);

/* Then insert some posts for testing: */
INSERT INTO posts (title,body,created)
VALUES ('The title', 'This is the post body.', NOW());
INSERT INTO posts (title,body,created)
VALUES ('A title once again', 'And the post body follows.', NOW());
INSERT INTO posts (title,body,created)
VALUES ('Title strikes back', 'This is really exciting! Not.', NOW());

-----------------
Cake Database Configuration
-----------------

/app/config/database.php.default . Make a copy of this file in the same directory, but name it database.php .

replace the values in the $default array with those that apply to your setup.

var $default = array('driver' => 'mysql',
'connect' => 'mysql_pconnect',
'host' => 'localhost',
'login' => 'cakeBlog',
'password' => 'c4k3-rUl3Z',
'database' => 'cake_blog_tutorial' );

TEST:localhost/cake ,you will get welcome page

-----------------
A Note On mod_rewrite
-----------------

If the Cake welcome page looks a little funny (no images or css styles), it probably means mod_rewrite isn't functioning on your system.

1. httpd.conf: Make sure the AllowOverride is set to All for the correct Directory.
2. Make sure you are loading up mod_rewrite correctly! You should see something like LoadModule rewrite_module libexec/httpd/mod_rewrite.so and AddModule mod_rewrite.c in your httpd.conf.

-----------------
Create a Post Model
-----------------

By creating a Cake model that will interact with our database, we'll have the foundation in place needed to do our view, add, edit, and delete operations later.

/app/models/post.php

<?php

class Post extends AppModel
{
var $name = 'Post';
}

?>
-----------------
Create a Posts Controller
-----------------

/app/controllers/posts_controller.php (index action added)

<?php

class PostsController extends AppController
{
var $name = 'Posts';

function index()
{
$this->set('posts', $this->Post->findAll());
}
function view($id = null)
{
$this->Post->id = $id;
$this->set('post', $this->Post->read());
}
}

?>
-----------------
Creating Post Views
-----------------

/app/views/posts/index.thtml

<h1>Blog posts</h1>

<table>
<tr><th>Id</th><th>Title</th><th>Created</th></tr>
<!-- Here's where we loop through our $posts array, printing out post info -->
<?php foreach ($posts as $post): ?>
<tr><td><?php echo $post['Post']['id']; ?>
</td><td><?php echo $html->link($post['Post']['title'], "/posts/view/".$post['Post']['id']); ?></td>
<td><?php echo $post['Post']['created']; ?></td>
</tr><?php endforeach; ?>
</table>

/app/views/posts/view.thtml

<h1><?php echo $post['Post']['title']?></h1>
<p><small>Created: <?php echo $post['Post']['created']?></small></p>
<p><?php echo $post['Post']['body']?></p>

-----------------
Adding Posts
-----------------

/app/controllers/posts_controller.php (add action added)

<?php

class PostsController extends AppController
{
var $name = 'Posts';

function index()
{
$this->set('posts', $this->Post->findAll());
}

function view($id)
{
$this->Post->id = $id;
$this->set('post', $this->Post->read());

}

function add()
{
if (!empty($this->data))
{
if ($this->Post->save($this->data))
{
$this->flash('Your post has been saved.','/posts');
}
}
}
}

?>

When a user uses a form to POST data to your application, that information is available in $this->params. You can pr() that out if you want to see what it looks like. $this->data is an alias for $this->params['data'].

The $this->flash() function called is a controller function that flashes a message to the user for a second (using the flash layout) then forwards the user on to another URL (/posts, in this case). If DEBUG is set to 0 $this->flash() will redirect automatically, however, if DEBUG > 0 then you will be able to see the flash layout and click on the message to handle the redirect.
-----------------
Form helper
-----------------
Everyone hates coding up endless forms and their validation routines, and Cake makes it easier and faster.

Here's our add view:
/app/views/posts/add.thtml
<h1>Add Post</h1><form method="post" action="<?php echo $html->url('/posts/add')?>"><p>
Title:
<?php echo $html->input('Post/title', array('size' => '40'))?><?php echo $html->tagErrorMsg('Post/title', 'Title is required.') ?></p><p>
Body:
<?php echo $html->textarea('Post/body', array('rows'=>'10')) ?><?php echo $html->tagErrorMsg('Post/body', 'Body is required.') ?></p><p><?php echo $html->submit('Save') ?></p></form>

The tagErrorMsg() function calls will output the error messages in case there is a validation problem.

-----------------
Data Validation
-----------------
If you'd like, you can update your /app/views/posts/index.thtml view to include a new "Add Post" link that points to www.example.com/posts/add.

That seems cool enough, but how do I tell Cake about my validation requirements? This is where we come back to the model.
/app/models/post.php (validation array added)
<?php

class Post extends AppModel
{
var $name = 'Post';

var $validate = array(

'title' => VALID_NOT_EMPTY,
'body' => VALID_NOT_EMPTY

);
}

?>

The $validate array tells Cake how to validate your data when the save() method is called. The values for those keys are just constants set by Cake that translate to regex matches (see /cake/libs/validators.php ).

you can also use Model::invalidate() to set your own validation dynamically.

TEST:Now that you have your validation in place, use the app to try to add a post without a title or body to see how it works.

-----------------
Deleting Posts
-----------------
Next, let's make a way for users to delete posts. Start with a delete() action in the PostsController:
/app/controllers/posts_controller.php (delete action only)
function delete($id)
{
$this->Post->del($id);
$this->flash('The post with id: '.$id.' has been deleted.', '/posts');
}

Because we're just executing some logic and redirecting, this action has no view. You might want to update your index view to allow users to delete posts, however.
/app/views/posts/index.thtml (add and delete links added)
<h1>Blog posts</h1><p><a href="/posts/add">Add Post</a></p><table><tr><th>Id</th><th>Title</th><th>Created</th></tr><!-- Here's where we loop through our $posts array, printing out post info --><?php foreach ($posts as $post): ?><tr><td><?php echo $post['Post']['id']; ?></td><td><?php echo $html->link($post['Post']['title'], '/posts/view/'.$post['Post']['id']);?><?php echo $html->link(
'Delete',
"/posts/delete/{$post['Post']['id']}",
null,
'Are you sure?'
)?></td></td><td><?php echo $post['Post']['created']; ?></td></tr><?php endforeach; ?></table>
-----------------
Editing Posts
-----------------

/app/controllers/posts_controller.php (edit action only)
function edit($id = null)
{
if (empty($this->data))
{
$this->Post->id = $id;
$this->data = $this->Post->read();
}
else
{
if ($this->Post->save($this->data['Post']))
{
$this->flash('Your post has been updated.','/posts');
}
}
}

/app/views/posts/edit.thtml
<h1>Edit Post</h1><form method="post" action="<?php echo $html->url('/posts/edit')?>"><?php echo $html->hidden('Post/id'); ?><p>
Title:
<?php echo $html->input('Post/title', array('size' => '40'))?><?php echo $html->tagErrorMsg('Post/title', 'Title is required.') ?></p><p>
Body:
<?php echo $html->textarea('Post/body', array('rows'=>'10')) ?><?php echo $html->tagErrorMsg('Post/body', 'Body is required.') ?></p><p><?php echo $html->submit('Save') ?></p></form>
-----------------
Conclusion
-----------------
Creating applications this way will win you peace, honor, women, and money beyond even your wildest fantasies. Simple, isn't it? Keep in mind that this tutorial was very basic. Cake has many more features to offer, and is flexible in ways we didn't wish to cover here. Use the rest of this manual as a guide for building more feature-rich applications.

© 2006 Cake Software Foundation
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