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Update record in php/mySQL

Posted on 2009-04-14
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Last Modified: 2012-05-06
I'm trying to do a simple edit of rows in a database and am hitting a wall.

I am adding rows with no problem.

Please take a look and see if you can see any problems.  For debug purposes, I have echo'd out the Strain_ID (primary field) ...it echos correctly in the first page but it is empty in the second page.
*********here's the edit page -- Strain_ID is the primary field***********
 
<?php
require "authentication.inc"; 
session_start();
 
// Connect to an authenticated session or relocate to logout.php
sessionAuthenticate();
 
 
$username = $_SESSION["loginUsername"]
?>
 
 
<?php require_once("includes/connection.php"); ?>
<?
	$mouse_id =  $_GET['mouse_id'];
	$record = mysql_query("SELECT * FROM mousetest WHERE ( Strain_ID='$mouse_id' )")
		or die("Could not query database");
		
	$mouse_row = mysql_fetch_array( $record );
 
	
?>
<form action="edit_mouseline2.php" method="POST">
<table width="100%" border="0">
  <tr>
    <td valign="top"><p>Principal Investigator: <input type="text" name ="Principal_Investigator" 
    value="<?php echo $mouse_row['Principal_Investigator']; ?>"  /></p>
    <p>Co Investigator: <input type="text" name ="Co_Investigator" 
    value="<?php echo $mouse_row['Co_Investigator']; ?>"  /></p>
 </tr>
</table>
Strain ID Is <?php echo $mouse_row['Strain_ID']; ?>
 
 
**************here's  the code for:  edit_mouseline2.php ******************
<?php require_once("includes/connection.php"); ?>
<?php  require_once 'includes/functions.php'; ?>
<?php
require "authentication.inc"; 
session_start();
 
// Connect to an authenticated session or relocate to logout.php
sessionAuthenticate();
 
 
$username = $_SESSION["loginUsername"]
?>
 
 
 <?php
			
  
		$Common_Strain =  mysql_prep($_POST['Common_Strain']);
		$Co_Investigator = mysql_prep($_POST['Co_Investigator']);
 
$query = "UPDATE mousetest SET Principal_Investigator='$Principal_Investigator' WHERE Strain_ID='$Strain_ID'";
								
$result = mysql_query($query)
or die ("Couldn't execute query");
	?>

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Question by:liz2008
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2 Comments
 
LVL 11

Accepted Solution

by:
AlexanderR earned 2000 total points
ID: 24141123
because you are not passing strain_id between your form and edit_mouseline2.php

create a hidden input your form that stores strain_id:

<input type="hidden" name="strain_id" value="<?php echo $mouse_row['Strain_ID']; ?>" />

grab it in edit_mouseline2.php:
$Strain_ID = mysql_prep($_POST['strain_id']);
0
 

Author Closing Comment

by:liz2008
ID: 31570012
Thank you, that was the missing piece.
0

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