Creating multiple pages from sql query - php

Question

I am trying to create multiple pages from my query. If I have 100 results, and I want 10 results per page, I would like there to be ten pages created, with each page showing a different query. This is how my query is set up:
$sql ="SELECT * FROM Post WHERE (active ='1') ORDER BY PostID DESC ";
$result = mysql_query($sql,$db);
$numrows = mysql_num_rows($result);
while(($post = mysql_fetch_assoc($result))) {
$posts[] = $post;
}
<?php
if (!$numrows){ echo $errormessage;}
else{
foreach($posts as $post): ?>
echo stripslashes($post['text']);
<?php endforeach; }?>
This pulls each "post" from the database and puts displays them all out.
I would like to do something like this:
$results = mysql_num_rows($result);
$numpages = 10/$results; //gives the number of pages
while($numpages<$results)
{
//run code from above\\
}
What is the best way to do this with the method that I use? I appreciate your opinions because I'm at one of those stages where I'm lost in my own logic. Thank You!

Answer 1

Most pagination examples fail to meet real life requirements. A custom query string, for example.
So, here is a complete yet concise example:
<?
per_page=10;
// Let's put FROM and WHERE parts of the query into variable
$from_where="FROM Post WHERE active ='1'";
// and get total number of records
$sql = "SELECT count(*) ".$from_where;
$res = mysql_query($sql) or trigger_error(mysql_error()." in ".$sql);
$row = mysql_fetch_row($res);
$total_rows = $row[0];
//let's get page number from the query string
if (isset($_GET['page'])) $CUR_PAGE = intval($_GET['page']); else $CUR_PAGE=1;
//and calculate $start variable for the LIMIT clause
$start = abs(($CUR_PAGE-1)*$per_page);
//Let's query database for the actual data
$sql = "SELECT * $from_where ORDER BY PostID DESC LIMIT $start,$per_page";
$res = mysql_query($sql) or trigger_error(mysql_error()." in ".$sql);
// and fill an array
while ($row=mysql_fetch_array($res)) $DATA[++$start]=$row;
//now let's form new query string without page variable
$uri = strtok($_SERVER['REQUEST_URI'],"?")."?";
$tmpget = $_GET;
unset($tmpget['page']);
if ($tmpget) {
$uri .= http_build_query($tmpget)."&";
}
//now we're getting total pages number and fill an array of links
$num_pages=ceil($total_rows/$per_page);
for($i=1;$i<=$num_pages;$i++) $PAGES[$i]=$uri.'page='.$i;
//and, finally, starting output in the template.
?>
Found rows: <b><?=$total_rows?></b><br><br>
<? foreach ($DATA as $i => $row): ?>
<?=$i?>. <?=$row['title']?><br>
<? endforeach ?>
<br>
Pages:
<? foreach ($PAGES as $i => $link): ?>
<? if ($i == $CUR_PAGE): ?>
<b><?=$i?></b>
<? else: ?>
<?=$i?>
<? endif ?>
<? endforeach ?>

Answer 2

It would be hideous to extract all data from the database and manage it from PHP. It would kill the RAM, and the network.
Use the LIMIT clause for paging.
First, you need to see the total number of records. Use
$query = 'SELECT count(1) as cnt FROM Post WHERE active =1';
then,
$result = mysql_query($query, $db);
$row = mysql_fetch_assoc($result);
$count = $row['cnt'];
$pages = ceil($count/10.0); //used to display page links. It's the total number of pages.
$page = 3; //get it from somewhere else, it's the page number.
Then extract the data
$query = 'SELECT count(1) as cnt FROM Post WHERE active =1 LIMIT '.$page*10.', 10';
$result = mysql_query($query, $db);
while($row = mysql_fetch_assoc($result))
{
//display your row
}
Then output the data.

Answer 3

I'm using that similar code to do that:
$data = mysql_query("SELECT * FROM `table`");
$total_data = mysql_num_rows($data);
$step = 30;
$from = $_GET['p'];
$data = mysql_query("SELECT * FROM `table` LIMIT '.$from.','.$step.'"
That code get total rows
and that for creating links:
$p=1;
for ($j = 0 ; $j <= $total_data+$step; $j+=$step)
{
echo ' '.$p.' ';
$p++;
} ?>
You can also read about : pagination