Need help with listing

princeofpersia · April 4, 2011

Hi guys, in code below im listing 6 books where user can reserve the books by pressing a submit button, the query works fine except it only chooses last book listed, if i press on book id 1 it runs the query with last book listed, could you help me to see what im doing wrong? thanks in advance


<?php
//we start a session here to help us pass the user login variable to other pages of the webs application while user is logged in.
session_start();


//connect to database 
include 'include/db.php';

?>

<!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">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Business Events</title>
<link href="style.css" rel="stylesheet" type="text/css" />
</head>

<body>
<div id="topPan">
<ul>
	<li><a href="#">login</a></li>
	<li class="register"><a href="login.php" class="register">resister</a></li>
</ul>
<a href="index.html"><img src="images/logo.gif" alt="Business Events" width="281" height="56" border="0" class="logo" title="Business Events" /></a>
</div>
<div id="headerPan">
  <div id="headerleftPan"><img src="images/blank.gif" alt="" width="1" height="1" /></div>
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<?php






//we get the seesion here
$myemail = $_SESSION['EmailAddress'];

//now, we can get the users name from db in accordance to our session and also we can see if users is logged in using our db


$getuser=mysql_query("SELECT * FROM member WHERE EmailAddress='$myemail' AND loggedin='1'");
//here we get number of rows which matches our database
if ($getrows=mysql_num_rows($getuser)>=1){
//now from the results we get the first name of users logged in
while ($row=mysql_fetch_array($getuser)){
$username=$row['FirstName'];
$userid=$row['Id'];
}


//here we get the credit for user

$getcredit=mysql_query("SELECT Credit FROM member WHERE Id='$userid'");
while($row=mysql_fetch_array($getcredit)){

$credit=$row['Credit'];
}



echo "Welcome $username, Your credit is $credit | <a href='logout.php'>Logout</a>";
?>
<p>
<?
//From here we start processing the rest of the code

//we get list of all books available

$getbooks=mysql_query("SELECT * FROM bookstorent");
while($row=mysql_fetch_array($getbooks))

{


//here booking proccess starts





$bookid=$row['id'];
$booktitle=$row['title'];
$bookauthor=$row['author'];
$bookisbn=$row['isbn'];
$bookdescription=$row['description'];
$bookreleasedate=$row['releasedate'];
$bookcategory=$row['category'];
$bookcost=$row['cost'];
$bookimage=$row['imagelink'];
$bookquantity=$row['quantity'];


echo"<form name='book' action='' method='post'>";
//here we list all the data we have from database
echo "


<table width='746' height='297' border='0'>
  <tr>
    <td width='200' height='291' valign='top'><table width='200' height='351' border='0'>
      <tr>
        <td><img name='' src='$bookimage' width='200' height='263' alt='my library' /></td>
      </tr>
    </table></td>
    <td width='530' valign='top'><table width='535' border='0'>
      <tr>
        <td width='525'>Title: <strong>$booktitle</strong></td>
      </tr>
      <tr>
        <td>Author: <strong>$bookauthor</strong></td>
      </tr>
      <tr>
        <td> Release Date: <strong>$bookreleasedate</strong></td>
      </tr>
      <tr>
        <td>Category: <strong>$bookcategory</strong></td>
      </tr>
      <tr>
        <td>ISBN: <strong>$bookisbn</strong></td>
      </tr>
      <tr>
        <td>Cost: <strong>£$bookcost</strong></td>
      </tr>
      <tr>
        <td>Available to book:<strong>$bookquantity</strong></td>
      </tr>
      <tr>
        <td height='88' valign='top'>Description: <strong>$bookdescription</strong></td>
      </tr>
      <tr>
        <td height='22' valign='top'><input type='submit' name='book' value='Book Now'/></td>
      </tr>
    </table></td>
  </tr>
</table>

<hr size='1' align='center' width='100%' color='red'>

";
echo "</form>";

}


//////////////////////////////
//////////////////////////////
//here booking proccess starts
//////////////////////////////
//////////////////////////////


if ($_POST['book']){
$bookfrom=date('d-m-Y'); 
$returndate=date('d-m-Y', strtotime("+3 days"));
$bookstatus='out';

$book=mysql_query("INSERT INTO rent (bookid,userid,booktitle,bookfrom,bookuntill,bookstatus) VALUES ('$bookid','$userid','$booktitle','$bookfrom','$returndate','$bookstatus')");


$getcredit=mysql_query("UPDATE member SET Credit=$credit-1 WHERE Id='$userid' ");



echo "Book $booktitle has been reserved to be picked up, your pick up date is $bookfrom and return date is $returndate ";











}

}
else 
{
header("Location: users/login.php");
}

?>
    
    </p>
<!--HTML form starts here-->




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spiderwell · April 4, 2011

you are not passing a bookid in the <form> why not add a hidden input to pass the bookid, and because you dont pull that from the form, when you send the form, the value of $bookid is the one from the last row of record set, not from the form.

I hope that makes sense.

I would suggest either putting the form processing before the recordset loop or just not bother with the variables in the recordset, there is no need to do this

$bookauthor=$row['author']

<td>Author: <strong>$bookauthor</strong></td>

when you can just have

<td>Author: <strong>$row['author']</strong></td>

or even better post the form to a seperate page, then once processed, redirect back to book listing page.

princeofpersia · April 4, 2011

sorry im a newbie, how do i do that?

spiderwell · April 4, 2011

this should get you started:

at the top of your <form>, add this line into the echo statement <input type='hidden' name='bookid' value='$bookid'>

then after the if($_POST) statement add this

$bookid = $_POST['bookid']

do the same for all variables you need to pass or you will see soon as you do this, $booktitle's value is the last one in the recordset, not the one clicked on , highlighting the same error you have with bookid currently

that should be the quickest way to get the script working without a huge reworking of the code inplace. I would suggest though that you look at refining it somewhat in the long run.

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