MVC on the example of CodeIgniter
The official website has a video about the creation of a blog. There it is told about application only of representation and the controller, the model falls and remains on independent studying. Next, I will try to tell you how to use the full MVC model on the example of blog entries.
Models (Model) - receives the necessary data.
Views - shows the user data.
Controllers (Controller) - controls the model and view.
')
Suppose a user visits our page. At this point, the Controller calls the Model, which returns the last 10 entries. The data is then transferred from the Controller to the View, which displays the page to the user.
Sql
Model
First, create a Model that selects all posts from the blog.
Our MBlog Model (location /system/application/models/mblog.php) looks like this:
Controller
Second, create a Blog Controller (location /system/application/controllers/blog.php). It looks like this:
What is going on here?
1. $ data ['title'] will be used as $ title in the Presentation template.
2. Blog entries from the database will be placed in $ data ['entries'] using the MBlog Model.
3. All data in the $ data array is passed to the View.
View
Third, create the Template view (location /system/application/views/template.php), which displays all entries to the user. It looks like this:
That's all. For beginners, you can give advice to first create a blog on video, and then modify it.
To have a deeper understanding of how this all works, you can view the source of one CMS .
Thanks for attention.
What is Model - View - Controller?
Models (Model) - receives the necessary data.
Views - shows the user data.
Controllers (Controller) - controls the model and view.
')
Suppose a user visits our page. At this point, the Controller calls the Model, which returns the last 10 entries. The data is then transferred from the Controller to the View, which displays the page to the user.
Consider how to implement mvc for example codeigniter.
Sql
CREATE TABLE `entries` (
`id` int (11) NOT NULL AUTO_INCREMENT,
`anons` text,
`title` varchar (255) DEFAULT NULL ,
`info` text,
`date_` datetime DEFAULT NULL ,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8Model
First, create a Model that selects all posts from the blog.
Our MBlog Model (location /system/application/models/mblog.php) looks like this:
class MBlog extends Model{
function MBlog(){
parent::Model();
}
function getAllEntries(){
$data = array();
$Q = $ this - > db- > get ('entries');
if ($Q- > num_rows() > 0){
foreach ($Q- > result_array() as $row){
$data[] = $row;
}
}
$Q- > free_result();
return $data;
}
}Controller
Second, create a Blog Controller (location /system/application/controllers/blog.php). It looks like this:
class Blog extends Controller {
function Blog(){
parent::Controller();
$ this ->load->model( 'MBlog' );
}
function index(){
$data['title'] = “ ”;
$data['entries'] = $ this -> MBlog-> getAllEntries();
$ this -> load-> vars($data);
$ this -> load-> view('template');
}
}What is going on here?
1. $ data ['title'] will be used as $ title in the Presentation template.
2. Blog entries from the database will be placed in $ data ['entries'] using the MBlog Model.
3. All data in the $ data array is passed to the View.
View
Third, create the Template view (location /system/application/views/template.php), which displays all entries to the user. It looks like this:
<!DOCTYPE html PUBLIC “- //W3C//DTD XHTML 1.0 Strict//EN” “http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd”>
<html xmlns=”http: //www.w3.org/1999/xhtml” xml:lang=”en” lang=”en”>
<head >
<meta http-equiv=”content-type” content=”text/html; charset=utf-8” />
<title> <?php echo $title; ?> </title>
</head>
<body>
<?php foreach ($entries as $row){
//
};
?>
</body>
</html>That's all. For beginners, you can give advice to first create a blog on video, and then modify it.
To have a deeper understanding of how this all works, you can view the source of one CMS .
Thanks for attention.
Source: https://habr.com/ru/post/52610/
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