PHP mvc mode article system-learning mvc

Interface DataOperation
{
public function select($info);
public function selectNum($info);
}

The above interface definition reads Data interface, the select method will return the required articles. The selectNum method returns the total number of articles, which is used for paging display. $info is an array used to store query conditions.

Interface DataSource
{
public static function getInstance();
}

It is assumed here that the database is operated, and DataSource defines an interface, and all those that implement this interface The instance class will get a static object.

Interface Controller
{
public function pop();
public function push();
public function execute();
}
Interface View
{
public function display();
}

Define a class to implement the DataSource interface, using the singleton pattern.

class DataBaseSource implements DataSource
{
public static $instance = null;
public static function getInstance()
{
if(self::$instance == null)
{
self ::$instance == new PDO("mysql:host=localhost;dbname=article","root","123456");
}
return self::$instance;
}
}

Define an abstract class to implement DataOperation. We want to share a database connection, so initialize the database object in the abstract class, so that all subclasses can share this object.

abstract class DataBaseOperation implements DataOperation
{
protected $db = null;
public function __construct()
{
$this->db = DataBaseSource::getInstance();
}
public function select($info);
}

Let’s write a business subclass to implement the abstract class DataBaseOperation

class Tech extends DataBaseOperation
{
public function select($info)
{
//Implement your code here
}
public function selectNum($info)
{
/ /Implement your code here
}
}

After implementing the business logic layer, open the control layer.

class ViewController implements Controller
{
private $mod = array();
public function push($key,$value);
{
//implement you code, register the class into $this->mod;
}
public function pop($key)
{
//Implement your code, set the value of $this->mod[$key] to null;
 }
public function execute($key)
{
//Implement your code here and generate an example. Pay attention to using the new features of php5, exception handling
}
}
//Presentation layer, Interface View will be implemented here
 abstract ArticleView implements View
{
protected $smarty = null;
public function __construct()
{
$this->smarty = new Smarty();
/// Below you can define some attribute values ​​​​of smarty
}
 }
Specific pages, such as the display page of technology articles
class TechArticleView extends ArticleView
{
public function display()
{
//Implement your code, call the Tech class and more DataBaseOperation subclasses
}
}< ;/p>
//General entrance index.php
try
{
$viewController = new ViewController();
$viewController->push("tech",TechArticleView);
//Continuous increase
$mod = $_GET["mod"]:$_GET["mod"]:$_POST["mod"];
//Finally
$viewController->execute($key);
}
catch(Exception $e)
{
//Handling exceptions
}
?>