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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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Comment
Question by:liz2008
2 Comments
 
LVL 11

Accepted Solution

by:
AlexanderR earned 500 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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