asked on

Fatal error: Call to a member function query() on a non-object in

Hey guys,

I'm trying to learn php and making my first cart at the moment. Found a tutorial online and have been able to save the cart contents into a session but I'm stuck on how to connect to the database to match the cart with the products in the database table.

this line

$result = $con->query($sql);

is causing the error...

Any help appreciated

<?php
		
		// login details for database
$dbhost = 'localhost';
$dbuser = 'username';
$dbpass = 'password';

// connect to database
$con = mysql_connect($dbhost, $dbuser, $dbpass) or die                      ('Error connecting to mysql');

// select products database
//mysql_select_db("futurek0_products", $con);

		$total = 0;
$output[] = '<table>';
foreach ($contents as $id=>$qty) {
$sql = 'SELECT * FROM products WHERE ID = '.$id;
$result = $con->query($sql);
$row = $result->fetch();
extract($row);
$output[] = '<tr>';
$output[] = '<td><a href="cart.php?action=delete&id='.$id.'" class="r">Remove</a></td>';
$output[] = '<td><input type="text" name="qty'.$id.'" value="'.$qty.'" size="3" maxlength="3" /></td>';
$output[] = '<td>&pound;'.($PRODUCT_PRICE * $qty).'</td>';
$total += $PRODUCT_PRICE * $qty;
$output[] = '</tr>';
}
$output[] = '</table>';
$output[] = '<p>Grand total: &pound;'.$total.'</p>';

?>

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SOLUTION

Marco Gasi

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ASKER CERTIFIED SOLUTION

Marco Gasi

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SOLUTION

Ray Paseur

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Mark Steggles

ASKER

Thanks marqusG,

I reworked the code (see attached) from your advice and am now getting results. The tutorial I was using is http://v3.thewatchmakerproject.com/journal/276/building-a-simple-php-shopping-cart

--

Thanks Ray, that code looks helpful.

--

One problem is that I'm only getting one result back when I loop through the cart. Something wrong with

foreach ($contents as $id=>$qty) { ?

Thanks

<?php
		
$total = 0;
echo '<table id="cart" cellspacing="0" cellpadding="0">
			<tr>
				<th>Product</th><th>Quantity</th><th>Price</th><th>Total</th><th>Remove</th>
			</tr>';
foreach ($contents as $id=>$qty) {
$sql = 'SELECT * FROM products WHERE ID = '.$id;
$result = mysql_query($sql,$con);
$row = mysql_fetch_array($result);
extract($row);
echo '<tr>';
echo '<td>' . $row['PRODUCT_DESC'] . '</td>';
echo '<td><input type="text" name="qty'.$id.'" value="'.$qty.'" size="3" maxlength="3" /></td>';
echo '<td>$' . $row['PRICE'] . '</td>';
echo '<td>$' . ($row["PRICE"] * $qty) . '</td>';
echo '<td><a href="cart.php?action=delete&id='.$id.'" class="r">Remove</a></td>';
$total += $row['PRICE'] * $qty;
echo '</tr>';
}
echo '</table>';
echo '<p>Grand total: $'.$total.'</p>';

?>

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Marco Gasi

Try write

$sql = 'SELECT * FROM products WHERE ID = '.$id; //why dot? it misses a '

$sql = 'SELECT * FROM products WHERE ID = '$id';

Then use this

while ($row = mysql_fetch_array($result){
echo '<tr>';
echo '<td>' . $row['PRODUCT_DESC'] . '</td>';
echo '<td><input type="text" name="qty'.$id.'" value="'.$qty.'" size="3" maxlength="3" /></td>';
echo '<td>$' . $row['PRICE'] . '</td>';
echo '<td>$' . ($row["PRICE"] * $qty) . '</td>';
echo '<td><a href="cart.php?action=delete&id='.$id.'" class="r">Remove</a></td>';
$total += $row['PRICE'] * $qty;
echo '</tr>';
}

I stronglky recommend you to read this tutorial and related book: http://articles.sitepoint.com/article/php-mysql-tutorial.

Good luck

Mark Steggles

ASKER

thanks guys