I take a different approach :
// In the MainHandler
Define('StorageClassName',"_MySQL");
Class UserController {
function __construct($objDataStore=false){
if(!$objDataStore)
$this->DataStore = new
instanceof($this).STORAGECLASSNAME ;
}
Function update(){
$data = $this->DataStore->Load("foo");
$data->Set("foo","bar");
$data->save;
}
This assumes your using DBO so the loaded foo object inherited the
settings/methods from the DB Datastore.
Thus letting you passing a different datastore object or it builds one based
on the model name and the storage type you set as a constant.
However it still links the two together so you can use $this calls to
reference the DataStore of the Model layer.
David
> -----Original Message-----
> From: Mert Oztekin [mailto:[email protected]]
> Sent: Tuesday, October 27, 2009 6:14 AM
> To: 'Eric Bauman'; [email protected]
> Subject: RE: [PHP] What is the best practice for adding persistence to an MVC
> model?
>
> Hi Eric,
>
> IMO, controllers shouldnt be responsible for interacting models and
> datastoreres. Controllers might only change the datastore class of a model.
>
> You may use your models in lots of controller functions. Defining datastore in
> all controllers seems not a good practice. (too much unneccessary codes
> written)
>
> A simple example
>
> //controller
> Public function doItController()
> {
> $user = new user();
> // $user->setDataStorer(new anotherDataStorer()); // this is
> optional if
> you want to change models datastorer
> $user->loadUserFromId(1);
> }
>
> // model
> Class user
> {
> Protected $_dataStorer = null;
>
> Public function loadUserFromId($id = 0)
> {
> // codes codes codes
> $result = $this->getDataStorer()->query("select .....");
> // codes codes codes
> }
>
> // codes codes codes
> Public function getDataStorer()
> {
> if(null == $this->_dataStorer)
> $this->_dataStorer = new myVeryBestDataStorer();
> return $this->_dataStorer;
> }
>
> Public function setDataStorer($newStorer)
> {
> $this->_dataStorer = $newStorer;
> }
> }
>
>
> Hope it will be usefull and understandable
>
> -----Original Message-----
> From: Eric Bauman [mailto:[email protected]]
> Sent: Tuesday, October 27, 2009 8:27 AM
> To: [email protected]
> Subject: [PHP] What is the best practice for adding persistence to an MVC
> model?
>
> I'm in the process of implementing an ultra-light MVC framework in PHP.
> It seems to be a common opinion that the loading of data from a database,
> file etc. should be independent of the Model, and I agree.
> What I'm unsure of is the best way to link this "data layer" into MVC.
>
> I've considered a few options:
>
> *Datastore interacts with Model*
>
> //controller
> public function update()
> {
>
> $model = $this->loadModel('foo');
> $data = $this->loadDataStore('foo', $model);
>
> $data->loadBar(9); //loads data and populates Model
> $model->setBar('bar');
> $data->save(); //reads data from Model and saves
>
> }
>
> *Controller mediates between Model and Datastore*
>
> Seems a bit verbose and requires the model to know that a datastore exists.
>
> //controller
> public function update()
> {
>
> $model = $this->loadModel('foo');
> $data = $this->loadDataStore('foo');
>
> $model->setDataStore($data);
>
> $model->getDataStore->loadBar(9); //loads data and populates Model
> $model->setBar('bar');
> $model->getDataStore->save(); //reads data from Model and saves
>
> }
>
> *Datastore extends Model*
>
> What happens if we want to save a Model extending a database datastore to
> a flatfile datastore?
>
> //controller
> public function update()
> {
>
> $model = $this->loadHybrid('foo'); //get_class == Datastore_Database
>
> $model->loadBar(9); //loads data and populates
> $model->setBar('bar');
> $model->save(); //saves
>
> }
>
> *Model extends datastore*
>
> This allows for Model portability, but it seems wrong to extend like this.
> Further, the datastore cannot make use of any of the Model's methods.
>
> //controller extends model
> public function update()
> {
>
> $model = $this->loadHybrid('foo'); //get_class == Model
>
> $model->loadBar(9); //loads data and populates
> $model->setBar('bar');
> $model->save(); //saves
>
> }
>
>
>
> Any input on the "best" option - or alternative - would be most appreciated.
>
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