oop extends or implement

[purencool]

hi phpfreaks

 

I have an class that is called "connDatabase" what I want to do with it is either extend it or implement it.

But I don't know which one to use. The other issue I have is say class "a" has three vars that the that the construct

needs to obstantiate and "connDatabase" needs three of its own. How do I obstantiate?

 

thanks for any help

[trq]

You cannot implement a class, only an interface, so that solves that.

 

I assume when you say obstantiate, you mean instantiate?

 

You can setup a __construct in a child class that calls the parent _-construct() before doing its own work.

 

class Foo extends Bar
{
  public function __construct()
  {
    parent::__construct();
    // do own setup
  }
}

 

On a side note. be careful extending a database classes. does the child really extend the database or just depend on it? There is a difference.

[Zurev]

Extending is  what you would want to do....

 

I believe you mean instantiate? Do you think you could post some code here? At least the classes and their constructs?

[purencool]

sorry instantiate.

 

Below are the two classes I want to join. I have code that needs to call on information out

of the database. But  what I am trying to achieve is to extend the connDatabase onto the Controller i will

be able to query the database and not have to keep writing database connections.

 

I have a number of classes that needs this sort of functionality.

 

Note: if this is back practice please tell I would rather corrected now.

 

 

class connDatabase {
    private $dbConnection
    private $unlock;
    private $path;

    protected $host;
    protected $database;
    protected $username;
    protected $password;

    public function __construct ($dbConnection,$unlock,$path){
        $this->dbConnection = $dbConnection;
        $this->unlock = $unlock;
        $this->path = $path;
        $this->decryptLock();
    }
    private function decryptLock(){
        //decrypt

        //addhost and data


        //place into private
    }
    private function connection($query){

            $db = new PDO("mysql:host=$this->host;dbname=$this->database", "$this->username", "$this->password" );
            $db->beginTransaction();
            $db->exec ($query);
            $db->commit();
            $db->Null;
    }
    public function getConnection ($query){

        $this->connection($query);
    }

}

 

class controller {

    private $pages;
    private $language;
    private $accessLevel;
    private $path;
    private $defaultpage;

    public function __construct($default,$path, $pages, $language, $accessLevel) {
        $this->pages = $pages;//array showing pages
        $this->language = $language;
        $this->accessLevel = $accessLevel;
        $this->path = $path;
        $this->defaultpage =$default;
       
    }

    private function findTech($request) {



        return $return;
    }


    public function findTechReturn($request) {

        return $return;
    }

[trq]

I can tell just by the name 'controller' that it is not at all related to and therefore should not extend the database class.

 

The database class might be a dependency, but that's it. Even then, any database interactions should likely be moved into models (but I won't go into that).

 

You controller simply requires the Database class. This should be passed into your __construct() method.

[purencool]

do you mean I can do something like this

 

$controller = new controller(controller vars ,$database = new connDatabase($var, $var, $var))

 

add the database connection as a var inside the class

class controller {

    private $pages;
    private $language;
    private $accessLevel;
    private $path;
    private $defaultpage;
    private $connectionDatabase;

    public function __construct($default,$path, $pages, $language, $accessLevel, $connectionDatabase) {
        $this->pages = $pages;//array showing pages
        $this->language = $language;
        $this->accessLevel = $accessLevel;
        $this->path = $path;
        $this->defaultpage =$default;
        $this->connection =$connectionDatabase;
       
    }

[jcbones]

Here's some good reading for you.

[btherl]

Yes you can do that.  We have one app that does it that way, and another app that has the db connection in a global variable (not inside any class).  Both of those approaches work.

[purencool]

thanks for the help and the information.