Silly OO problem!

[jonsamwell]

Hi,

 

I am having problems getting this method to see the variables! I keep getting the error.

 

'Fatal error: Cannot access empty property in C:\wamp\www\parser\Parser\Database\Database_Connection.php on line (db_connect() method)'

 

I don't understand why the variables are seen as empty as they are intitalised????

 

class Database_Connection {

    var $username = 'User_main';
    var $password = 'password';
    var $server = 'localhost';
    var $database_name = 'pricing';
    var $link_identifier = null;


    function _constructor()
    {//Default Constructor
    }

    function db_connect()
    {
        $this->$link_identifier = mysql_connect($this->$server, $this->$username, $this->$password);
    }
}

 

If i hard code the values everything works fine.

[DeanWhitehouse]

All of your

$this -> $varName

should be

$this -> varName

 

Without the $ sign

[Mchl]

'var' is a thing of PHP4, and constructor method is called __construct() in PHP5.

 

Oh... and perhaps you should try mysqli if you're going into OOP.

[jonsamwell]

cool thanks work,

 

just trying to go from 'normal' php to OO

 

What is mysqli?

 

has it got foriegn key abilities??

 

regards,

[DeanWhitehouse]

Change var to public (the equivalent), read up on some php 5 OOP tutorials

[dennismonsewicz]

whats the big difference between mysql and mysqli?

[Mchl]

mysqli stands for "mysql Improved". It's recommended extension to use, when connecting to MySQL server version 4.1 or later.

 

Foreign key capability is a thing of storage engine itself. MyISAM doesn't have it, InnoDB does.

 

whats the big difference between mysql and mysqli?

 

It's object oriented, enables use of prepared statements (and some other features, that mysql lacks), it is said to be faster.

[dennismonsewicz]

ah gotcha... i am slowly filtering in PHP5 (OOP) into my every day programming... very new to it.. kinda confusing lol

[DarkSuperHero]

Doing the same here....i find it dificult to not make things over complicated sometimes...i end up getting rid of something i dont need in my OO code all the time... i star out thinking i think i need it when in fact i dont/wont.. :-)

 

cheers!