Return X values where an ID number doesnt matter

Posted on 16th Feb 2014 07:03 pm by admin

Well as for subject heading, thats the best i could think of.

Currently im having a problem with a rather old piece of script i had written for a guestbook.
The guestbook itself relies completely on the `id` field of the table to show the posts.
But if a post is deleted, then it screws up the pagination of the posts such that if you were to click "next page" the same results as the last page would show.

The query:
Line number On/Off | Expand/Contract$set = $numAllResults-$offset+1;SELECT * FROM `posts` WHERE `id` <= '$set' ORDER BY `id` DESC

This query works wonders if every entry in the table is only incremented by 1, but breaks when an entry of 'X' does not exist. ie. it skips post 'X' but also shows older posts based on the newest entry. As i know this isnt clear, let me clear it up with an example:
Line number On/Off | Expand/Contracttable - `posts``id`, `name`, `post`1,'Joe','Hi there'2,'Johanna','Love the guest book'3,'Jeff','Great stuff'4,'James','Could have more stuff'8,'John','Excellent!'9,'Joel','Not bad'

As you can see, there are 3 entries missing because they were deleted.
As it stands, there should be 2 pages in the guestbook because there are more than 5 entries.
However, the first page will show entries:
9,8,4,3,2.
The second page:
8,4,3,2,1

Now in this example, the problem isnt too huge, although when i have say 20 entries with half deleted, it will show the same posts for about 4 pages, and then change after the $set is lower than the older posts.

Yes i am posting my code, but, this was written over a year ago now, so i know i am breaking some of my own today's standards for programming Im just looking for a fix so that when items are deleted it will still show everything properly.

Line number On/Off | Expand/Contract<?phpinclude_once("include/connect.php");$guestbookconnect = connect();mysql_select_db("alexast_db",$guestbookconnect);$offset = $_GET['p'];if(!$_GET['p']){$offset = 0;}if($offset < 0){print "<script>window.location = 'guestbook.php';</script>";}$results = 5; //display number of results per page.$currentresults = 0; $getAllPostsSQL = "SELECT * FROM `posts` ORDER BY `id` DESC";$getAllPostsQuery = mysql_query($getAllPostsSQL, $guestbookconnect) or die(mysql_error($guestbookconnect));$numAllResults = mysql_num_rows($getAllPostsQuery); $set = $numAllResults-$offset+1;$getPostsSQL = "SELECT * FROM `posts` WHERE `id` <= '$set' ORDER BY `id` DESC";$getPostsQuery = mysql_query($getPostsSQL, $guestbookconnect) or die(mysql_error($guestbookconnect));$numResults = mysql_num_rows($getPostsQuery); while($getPostsResult = mysql_fetch_assoc($getPostsQuery)){$currentresults++; if($currentresults <= $results){?> <div class="guestbook_frame"> <div class="guestbook_box1"> <div id="style_name"><?php print $getPostsResult['name']; ?></div> </div> <div class="guestbook_box2"> <div id="style_date"><?php print $getPostsResult['date']; ?></div> </div> <div class="guestbook_box3"> </div> <div class="guestbook_box4"> <div id="style_content"><?php print $getPostsResult['content']; ?></div> </div> </div><?php }}mysql_close($guestbookconnect);?>

Your Answer:

Login to answer

Other forums

Adding delete feature to my forum
Hello I am currently trying to add a delete feature to my forum. I believe I have everything built r

Insert numbers from Barcode scanner into online php page
I have a real big problem, Here is what I'm trying to do. I have a Intermec CN3 handheld computer th

Multidimensional $_POST
Hello

How to get a single array from array of array (2 - dimension).
For example I have a

Install page
How do I make it so when a user submits information on the Install page, it'll right it into the cor

UDP server recvfrom() always returns -1? :(
Hello all,
I am getting a very strange error in my code :( I am writing a server application in C

Javascript or not?
How many people prefer javascript/ajax sites? How many prefer the good old fashion straight php sit

Display last record first.
I need some help how put the last record first and first record last.

Thanks

Code: &am

Typedef struct vs just struct
Anyone know the rationale for using typedef for structs when a struct is itself a typedef? I have s

TemplatePower & AJAX
Hi all,



I'm currently implementing some AJAX features in my PHP-framework (which is b

How to update this array?
I am saving a string that looks this: username1, username2, username3...
into a single cell in a