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Conditional Update - Only update certain field if another field has been changed

Thread began 8/25/2014 6:43 pm by dlovas275157 | Last modified 9/08/2014 11:45 am by Jason Byrnes | 1044 views | 5 replies |

dlovas275157

Conditional Update - Only update certain field if another field has been changed

This post is related to a recent post here:
http://www.webassist.com/forums/posts.php?id=35295

I am working on a permalink solution for my webassist based sites, and I have two database fields in a table:
careerTitle
careerPermalink

I have the insert.php page working great (thanks to Jason's previous help). The careerPermalink is based off the careerTitle field and increments (-1, or -2) if the title is already present by doing an occurrence count via a recordset.

On the update.php page, I would like the careerPermalink database field to only update (and do the increment) if the careerTitle database field has changed. Is there a way to perform a check (if careerTitle is being changed) and then update the careerPermalink and do the increment if needed?

Attached is my existing code.

Attached Files
update.php.zip
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Jason ByrnesWebAssist

create a hidden form element in the form named OrigTitle and bind it to the title column from the recordset. create another hidden element named OrigPermaLink and bind it to the perma link column of the recordset. then use the following code for the permalink binding:

<?php echo(($_POST["careerTitle"] != $_POST["OrigTitle"])?strtolower(((isset($_POST["careerTitle"]))?str_replace(" ","-",$_POST["careerTitle"]).(($row_rsOccurrencePermalink["occurrenceCount"] > 0)?"-".$row_rsOccurrencePermalink["occurrenceCount"]:""):"")):$_POST["OrigPermaLink"]); ?>



this will compare the posted title to the origianl title and create the perma link if it is different, or use the original perma link if not.

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dlovas275157

I have my permalinks working well, there is just 1 small issue surrunding the update.php page and the increment/count when a record with the same tilte already exists.

Here is in detail the issue:

If I create a career listing and enter a title of "My Title", the insert works great. If I update that listing, it updates correctly and only changes the "careerPermalink" field if the "careerTitle" field has changed, and it only increments if needed. If i add a second entry with the same name, it will increment it properly with -1 as expected.

Problem:
Problem occurs when you enter two careers with identical titles, and then immediately update the second entry for the very first time without changing anything (it will increment it from -1 to -2 when not needed).

Since this is a little hard to follow, I have provided in the private message area, access to my pages so you can add/update and hopefully see easier what is going on. Add 2 records witht he same careerTitle, and then immediately update the second one without making any changes, you will see the un-needed increment. Repeated updates after this update are not problematic.

Attached Files
careers.zip
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Jason ByrnesWebAssist

This is as expected

you create 2 records with the same title, so the occurrence count of the title would be 2

when you inset the first one, the title occurance count is 0

when you insert the second, the occuerance count is 1

when you update either one, the occurance count now becomes 2


you have not implemented what i sugested in message 2 so that the update will only occur if you make a change to the title

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dlovas275157

Ok, i rebuilt the Update SB following your procedure exactly and it is working now.

Not sure what happened, i think my files reverted and i lost a version.

Regardless it is working, and to slightly improve upon it i used:

preg_replace("/[\W]+/" instead of str_replace(" " to strip out any non-alpha numeric characters so the permalinks look nicer. For some reason /[\W]+/ only works with preg_replace and preg_replace does not work with the WebAssist DA Wizard so i have to swap the code after it is built with DA in code view. The wizard adds an extra slash for some reason as follows: \\W

Again, appreciate the help.

Daniel

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Jason ByrnesWebAssist

ok, glad to hear it is working.

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