SQL error when creating my own form in joomla - php

Question

hey guys i want to creat my own form in joomla and use the post method .
so i download extension to make my own code in articles in joomla like this
<form action="http://localhost/ocr/includes/Create_Subject.php" method="post">
username <input type="text" name="menu_name" value=""/><br/>
password <input type="text" name="id" value=""/><br/>
<input type="submit" name="save" value="Submit" />
</form>
and then i go to my website data base and create a table called show to add into it my values which i get it from my form and also
make a php file called (Create_Subject.php) and i put it in includes file in my website and called it by action like u see in my code in my html and the code of that php here
<?php
$coonect=mysql_connect("localhost","root","");
if(!$coonect){
echo "Data_base error";
die(mysql_error());
}
?>
<?php
$username=$_POST['menu_name'];
$id=$_POST['id'];
$db_select=mysql_select_db("ocr");
if(!$db_select){
die(mysql_error());
echo" error";
}
$query= "INSERT INTO show (
name , id )
VALUES( '{$username}' ,{$id} ) " ;
if(mysql_query($query)){
header("www.google.com");
exit;
}else{
echo"<p> error </p>";
}
?>
`
and when iam run the site show to my an error what am doing wrong any heleeeep plez ....:))

Answer 1

Here you can find plenty of information about SQLQuering with Joomla!
http://docs.joomla.org/Accessing_the_database_using_JDatabase
You can ask anything you want if you have any trouble...