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Simple field update???

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bigbird3156

bigbird3156

Programmer
Feb 20, 2001
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AU
Hi...

If I pass a variable from another page and want it to replace the contents of a field from the database is there a simple way to do it???...

what would it look like??

i.e I want the contents of the variable "var2" to replace the contents of "$row_Recordset1['prod_cat']" automatically...

The idea is that there will be multiple records with the same field needing to be replaced and I want to repeat the function on the one page until all have been updated...

All I need here is the replace code the rest I have under control

The Bird from Down Under- Bigbird 3156 [upsidedown]
 
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assuming that the variable is passed in the query string

Code: 
//after data seek
$row_Recordset1['prod_cat'] = empty($_GET['var2']) ? $row_Recordset1['prod_cat'] : $_GET['var2'];
 
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I can't get this to work...

maybe it is the setup of the rest of the page... can you have a quick look...

Code: 
<body>
<p>Changing category <?php echo $_GET['val1']?> to <?php echo $_GET['val2']?></p>
<p>Updated Records</p>

<?php do { ?>
  <table width="650" border="0" align="center">
    <tr>
      <td width="50" align="left"><?php echo $row_Recordset1['prod_num']; ?></td>
      <td width="174" align="left"><?php echo $row_Recordset1['prod_name']; ?></td>
      <td width="188" align="left"><?php echo $row_Recordset1['designer']; ?></td>
      <td width="119" align="left"><?php $row_Recordset1['prod_cat'] = empty($_GET['var2']) ? $row_Recordset1['prod_cat'] : $_GET['var2']; ?>Updated!</td>
    </tr>
  </table>
  <?php } while ($row_Recordset1 = mysql_fetch_assoc($Recordset1)); ?>

The Bird from Down Under- Bigbird 3156 [upsidedown]
 
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your do ... while loop is inverted. and you are using a return function in a write context. and your table tags are inside the loop.

Code: 
<?php 
if (mysql_num_rows($Recordset1) > 0){
	$data = '';
	while ($row_Recordset1 = mysql_fetch_assoc($Recordset1)){
		$row_Recordset1['prod_cat'] = empty($_GET['var2']) ? $row_Recordset1['prod_cat'] : $_GET['var2']; 
		$data .= <<<HTML
		
	<tr>
      <td width="50" align="left">{$row_Recordset1['prod_num']}</td>
      <td width="174" align="left">{$row_Recordset1['prod_name']}</td>
      <td width="188" align="left">{$row_Recordset1['designer']}</td>
      <td width="119" align="left">{$row_Recordset1['prod_cat']} Updated!</td>
    </tr>

HTML;
	}	//end while
	echo <<<HTML
<table width="650" border="0" align="center">
	<tbody>
	$data
	</tbody>    
</table>
HTML;
} else { 	//no records returned
	echo "No records were updated";
}
 
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Thanks for that Jpadie...

I tried your code and it did not work...

firstly it did not loop, only showing the first record and secondly it did not actually update the record it showed either...

I assume that the
Code: 
{$row_Recordset1['prod_cat']} Updated!

inside the frame should display the updated prod_cat however it does not nor does it actually update...


The Bird from Down Under- Bigbird 3156 [upsidedown]
 
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are you intending to update the actual database with this code? this is data RETRIEVAL scripting, not data manipulation. changing a value in a retrieved does not change the actual recordset. to do that you must execute SQL UPDATE statements.

the table is created inside a while loop. if there is only one record shown then only one record is retrieved by your sql code.

if the text ' ... Updated!' does not display any prefix it is because there is no data within $row_Recordset1['prod_cat'] retrieved from the database.

 
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Ok, thanks for that... I have another look into it and see if i can work it out before I ask for the inevitable help...

having said that however I did choose a category that had multiple records associated with it ... yet only got the one record actually showing up

The Bird from Down Under- Bigbird 3156 [upsidedown]
 
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My apologies... the loop does work however it misses 1 record... I was using a category that had only 2 records and only 1 was coming up - but I tried again with a cat that had 36 records and 35 came up...

The Bird from Down Under- Bigbird 3156 [upsidedown]
 
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that cannot happen. unless you are using a do while loop rather than a while loop.
 
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OK... so I need to change the following line of code...

Code: 
while ($row_Recordset1 = mysql_fetch_assoc($Recordset1)){
        $row_Recordset1['prod_cat'] = empty($_GET['var2']) ? $row_Recordset1['prod_cat'] : $_GET['var2'];

to something with an UPDATE command in it... however I am struggling to make the passed variables work in this... I have written it like this...
Code: 
mysql_query("UPDATE products SET prod_cat = $_GET['val2'] WHERE prod_cat = $_GET['val1']");

which obviously does not work... but how do I make it work???

If I change it to something like...
Code: 
mysql_query("UPDATE products SET prod_cat = 'buttons' WHERE prod_cat = 'books'");
it works...but obviously I need to use the passed variables...

The Bird from Down Under- Bigbird 3156 [upsidedown]
 
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Code: 
if (!empty($_GET['val1'])){
 $val2 = mysql_real_escape_string($_GET['val2']);
 $val1 = mysql_real_escape_string($_GET['val1']);
mysql_query("UPDATE products SET prod_cat = '$val2' WHERE prod_cat = '$val1');
}

this will update ALL instances of one product category with the new. i.e. NOT ON A RECORD BY RECORD BASIS.

if you want to be selective you need to add the primary key to the where clause.
 
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