Pagination with Microsoft sql & PHP - php

Question

Trying to do some pageintaion with mssql & php but i cant seem to get it working... i get no errors, so i cant really find out what im doing wrong, am i missing anything obvious?
<?php
error_reporting(E_ALL); ini_set('display_errors', 1);
$dbhost = 'localhost';
$dbuser = '*****';
$dbpass = '******';
$db = 'blog';
$connectionInfo = array( "UID"=>$dbuser,
"PWD"=>$dbpass,
"Database"=>$db, "CharacterSet" => "UTF-8");
$connect_db = sqlsrv_connect ( $dbhost, $connectionInfo ) or die(sqlsrv_errors());
if ((!isset($_GET['pagenum'])) || (!is_numeric($_GET['pagenum'])) || ($_GET['pagenum'] < 1)) { $pagenum = 1; }
else { $pagenum = $_GET['pagenum']; }
$result = sqlsrv_query ($connect_db,"SELECT blogID FROM blog_posts") or die(sqlsrv_errors());
$rows = sqlsrv_num_rows($result);
$page_rows = 2;
$last = ceil($rows/$page_rows);
if (($pagenum > $last) && ($last > 0)) { $pagenum = $last; }
$max = ($pagenum - 1) * $page_rows;
$result2 = sqlsrv_query(($connect_db,"SELECT TOP $page_rows FROM blog_posts WHERE blogID NOT IN (SELECT TOP $max blogID FROM blog_posts ORDER BY blogID ASC) ORDER BY blogID ASC") or die(sqlsrv_errors());
while($info = sqlsrv_fetch_array( $result2, SQLSRV_FETCH_BOTH ))
{
print $info['blogID'];
echo "<br>";
}
echo "<p>";
echo " --Page $pagenum of $last-- <p>";
if ($pagenum == 1) { }
else
{
echo " <a href='{$_SERVER['PHP_SELF']}?pagenum=1'> <<-First</a> ";
echo " ";
$previous = $pagenum-1;
echo " <a href='{$_SERVER['PHP_SELF']}?pagenum=$previous'> <-Previous</a> ";
}
echo " ---- ";
if ($pagenum == $last)
{
}
else {
$next = $pagenum+1;
echo " <a href='{$_SERVER['PHP_SELF']}?pagenum=$next'>Next -></a> ";
echo " ";
echo " <a href='{$_SERVER['PHP_SELF']}?pagenum=$last'>Last ->></a> ";
}
?>
blogID is the unique id of every post in the db

Answer 1

Non technical answer (eg, not writing all your code for you)
You've currently got the code that says $max = (page number-1) * length of page
-if page = 1, then max = 0, so there is no data for page 1
-for page 2, you'd have 1 page length of stuff
-for page 3, you'd have 2 page lengths of stuff
clearly - this isnt what you meant. What you meant to do was select the number of rows from end of previous page, to the end of the current page. MSSQL is less good at this
firstly
you need a min and max. to show from
$min = (page number -1 * pagelength)+1
(eg not the same record at end of one page and the beginning of the next)
$max = page number * pagelength
if page length was 5, a page view might be min record 21, and max 25
you can then use SQL like
SELECT *
FROM ( <your query here>
) AS RowConstrainedResult
WHERE RowNum >= $min
AND RowNum < $max
ORDER BY RowNum
your current select statement only gets a blog id - so its going to be a rather boring page but.. thats your call - but hopefully you get the idea.
You would also need to know the number of records, as you'd need to decide if there are more pages after all.