| Re: OOP, classes and databases [message #169546 is a reply to message #169543] |
Fri, 17 September 2010 13:22   |
Mattias Campe
Messages: 7
Registered: September 2010
Karma:
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Junior Member |
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Op 17-09-10 14:59, "Álvaro G. Vicario" schreef:
> El 17/09/2010 14:57, Mattias Campe escribió/wrote:
>> Op 14-09-10 21:22, Thomas Mlynarczyk schreef:
>>> Mattias Campe schrieb:
>>>> > public static function getById(PDO $db, $id){
>>>> > // ....
>>>> > return new Person($row['id'], $row['name'], $row['adress']);
>>>> > }
>>>>
>>>> How could I use this class? Because I would need to make a Person from
>>>> the database, but first I would need to make a "random" Person, like:
>>>>
>>>> $oPerson = new Person("000","something that will be
>>>> overwritten","blabla");
>>>>
>>>> $oPerson->getById($dbh,"245");
>>>
>>> No. The crucial thing here is the "static" keyword: "public STATIC
>>> function getById(...)" That means you don't need a Person instance to
>>> access it, you simply write:
>>>
>>> $oPerson = Person::getById( $dbh, '245' );
>>>
>>
>> Owkay, now I understand. So I could use that class in two ways:
>>
>> Make a Person:
>> $oPerson1 = new Person("010","Johan","some adress");
>>
>> Get an existing Person
>> $oPerson2 = Person::getById($dbh, '245');
>>
>>
>>
>> So I think I'm getting it. Or at least almost: would it have the same
>> effect as using 2 constructors?
>>
>> public function __construct($id, $name, $address){
>> // ...
>> }
>> public function __construct($id, $dbh){
>> // ...
>> }
>>
>> $oPerson1 = new Person("010","Johan","some adress");
>> $oPerson2 = new Person($dbh, '245');
>
> I'm not sure about what you mean exactly but in PHP you cannot have more
> than one constructor. What I suggested is just a way to kind of separate
> DB logic from application logic.
>
I was wondering if "my" way and your way had the same effect, but "my"
way seems to be impossible in PHP. In my search for more information I
stumbled across this site [1] which refers to the static way of working,
just like you taught me.
[1] http://alfonsojimenez.com/php/multiple-constructors-in-php/
Thank you for the help!
Mattias
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