Hi,
I am designing my own CMS which i hope to release to the public, however this is my first project I have done using OOP...
Here in Australia there is NO one Tafe or University course that teaches OOP, I am wondering if someone would be kind to help me find out why the following is not working
I have the following files
config.php
dbopen.php
dbclose.php
index.php
articals.php
Now to explain what these files do.
Config.php
- has all the same things that Joomla has inside its config files. Just names a bit different and something left out, but looks the same.
dbopen.php
has the following code
PHP Code:
<?php
require_once("configuration.php");
$vconfig = new VConfig();
//Create objects from DBObject class.
$myObj = new DBConnect("localhost","$vconfig->user","$vconfig->dbpass","$vconfig->db");
/*
You need to pass the values to the arguments for the constructor from
superclass DBConnect. If not $dbData won't know how to connect to database.
*/
// $dbData = new DBData("localhost","$vconfig->user","$vconfig->dbpass","$vconfig->db");
/*
You need to connect to MySQL before work on any databases.
*/
$myObj ->connectToMySQL();
/*
- Because the class DBData defined only one method selectDB();
- Whenever you want to work with a database, you need to connect to MySQL first.
- In your situation, You didn't call method connectToMySQL() from superclass DBObject.
--> That's why You cannot select any databases.(Thats why you've got the errors)
*/
//$dbData ->selectDB();
class DBConnect{
/////////////////////////////////////////////////
// PROTECTED PROPERTIES
/////////////////////////////////////////////////
protected $hostname, $username, $password,$db_name, $con ;
/**
* Constructor
* @param String $hostname,$username,$password,$db_name.
* All information we need to provide whenever connect to db.
*/
public function __construct($hostname,$username,$password,$db_name){
$this->hostname = $hostname;
$this->username = $username;
$this->password = $password;
$this->db_name = $db_name;
}
/**
* Connect to MySQL.
* @return void
*/
public function connectToMySQL(){
$this->con = mysql_connect($this->hostname,$this->username,$this->password);
if($this->con){
echo "<br>Connected sucessfully to MySQL .<br>";
}
else{
die( "<br>Could not connect to MySQL" . mysql_error() . ".<br />");
}
}
}
?>
The next file that runs is artical.php
PHP Code:
<?php
require_once("configuration.php");
$vconfig = new VConfig();
$dbData = new DBData("localhost","$vconfig->user","$vconfig->dbpass","$vconfig->db");
class DBData extends DBConnect{
/* This class doesn't define any constructors. Whenever you create a object from
* this class, The object will automaticaly refer to constructor of
* super class (DBObject class). cause DBData extends from DBConnect class
*/
public function title(){
$result=$DBData->query('SELECT * FROM push_content');
$row=$result->fetch_assoc();
//echo user's password
print $row['title'];
}
}
?>
and the closedb.php has the following
PHP Code:
<?php
/* You don't need to create a class just for closing a connection.
* This method you can build in DBConnect or DBObject class. But anyhow this is your option
* Maybe you have some special reason to have this class.
*/
class DBClose extends DBConnect{
function closeConnection(){
mysql_close();
}
}
?>
and in the index.php it links to each one of these using an include script.
the output in the index.php
PHP Code:
<?Php
//use joomla db class
require_once("configuration.php");
$vconfig = new VConfig();
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xml:lang="en-gb"
lang="en-gb" >
<head>
<title><?php print $vconfig->site_title; ?></title>
<meta name="description" content="<?php print $vconfig->SiteDesc; ?>" />
<meta name="keywords" content="<?php print $vconfig->SEOKeys; ?>" />
</head>
<body>
<?php
require_once("include/dbconnect/opendb.php");
require_once("system/articals/artical.php");
$dbData ->title();
</body>
</html>
<?php
require_once("include/dbconnect/dbclose.php");
?>
the code $dbData ->title();
makes this error. Fatal error: Call to a member function query() on a non-object in /home/desvisa/public_html/beta/system/articals/artical.php on line 15
which means this code
PHP Code:
$result=$DBData->query('SELECT * FROM push_content');
is wrong but i dont know why,
can someone please help
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Learning OOP the hard way! Please help
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