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12.30.2007 at 06:11PM PST, ID: 23050208
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7.6

Paging mysql results with php - only the first page of results loads correctly.

Asked by databsl in PHP and Databases, PHP Scripting Language, MySQL Server

Tags:

I have been trying for weeks to get paging working for myql database results. I can get to the point where my results are limited by $offset and $rowsperpage, and paging links showing up but going through to the 2nd page of results doesnt display anything.

I have tried some tweaks found elsewhere on the net but the only improvement I can make is getting to the point where it loads the first 5 results on every single page (hardly an improvement).

Any help is greatly appreciated.

Below is the original code, based on a forum from tizag.com and modified.Start Free Trial 
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//Variables from form POST
$type=$_POST['type'];
$cost=$_POST['cost'];
$capacity=$_POST['capacity'];
$alcohol=$_POST['alcohol'];
$food=$_POST['food'];
$location=$_POST['location'];
$keywords=$_POST['keywords']; 
 
//Connect to database
$con = mysql_connect("localhost","root");
if (!$con)
  {
  die('Could not connect: ' . mysql_error());
  }
 
mysql_select_db("venuetest", $con); 
 
// How many rows of results need to be on each page?
$rowsPerPage = 5;
 
// by default we show first page
$pageNum = 1;
 
// if $_GET['page'] defined, use it as page number
if(isset($_GET['page'])) {
    $pageNum = $_GET['page']; 
	}
	
// Count the offset so each page will know how many rows to skip in order to get to the rows meant for each page
$offset = ($pageNum - 1) * $rowsPerPage;
 
//query database
$query = "select * from venues where (classification = '$type' AND 
												   cost='$cost' AND
												   capacity='$capacity' AND
												   alcohol='$alcohol' AND
												   food='$food' AND
												   location='$location' AND
												   keywords LIKE '$keywords') LIMIT $offset, $rowsPerPage";
												   
$result=mysql_query($query);
 
// We have to query the database again to count how many rows we have total
$query2   = "select * from venues where (classification = '$type' AND 
												   cost='$cost' AND
												   capacity='$capacity' AND
												   alcohol='$alcohol' AND
												   food='$food' AND
												   location='$location' AND
												   keywords LIKE '$keywords')";
$result2  = mysql_query($query2) or die('Error, query2 failed');
$numrows = mysql_num_rows($result2);
 
//count total rows in database
$total = mysql_query("select * from venues") or die (mysql_error());
$dbtotal = mysql_num_rows($total);
 
//If no results display message
if ($numrows == 0)
	{
	echo ("Please return to the search page and broaden your search criteria");
	}
	
//otherwise, display results in a table
else 
	{ 
echo "<table>
while($showresult = mysql_fetch_array( $result )) {
echo ("<tr><td>");
echo ($showresult["venue"]);
echo ("</td><td>");
echo ($showresult["email"]);
echo ("</td><td>");
echo ($showresult["images"]);
echo ("</td></tr>");
	}
	}
echo "</table>";
 
// how many pages we have when using paging?
$maxPage = ceil($numrows/$rowsPerPage);  
 
// Print page number links
$self = $_SERVER['PHP_SELF'];
$nav = '';
for($page = 1; $page <= $maxPage; $page++) {
    if ($page == $pageNum) {
            $nav .= " $page ";   // no need to create a link to current page
    } else {
            $nav .= " <a href=\"$self?page=$page&rowsPerPage=$rowsPerPage\" class='page'>$page</a> ";
    }
}
 
    // creating previous and next link
    // plus the link to go straight to
    // the first and last page
    if ($pageNum > 1) {
        $page = $pageNum - 1;
        $prev = " <a href=\"$self?page=$page&rowsPerPage=$rowsPerPage\" class='page'>&lt;</a> ";
         
        $first = " <a href=\"$self?page=1&rowsPerPage=$rowsPerPage\" class='page'>&lt;&lt;</a> ";
    } else {
        $prev  = '&nbsp;'; // we're on page one, don't print previous link
        $first = '&nbsp;'; // nor the first page link
    }
    if ($pageNum < $maxPage) {
        $page = $pageNum + 1;
        $next = " <a href=\"$self?page=$page&rowsPerPage=$rowsPerPage\" class='page'>&gt;</a> ";
        $last = " <a href=\"$self?page=$maxPage&rowsPerPage=$rowsPerPage\" class='page'>&gt;&gt;</a> ";
    } else {
        $next = '&nbsp;'; // we're on the last page, don't print next link
        $last = '&nbsp;'; // nor the last page link
    }
// print the navigation link
echo $first . $prev . $nav . $next . $last;
// and close the database connection
mysql_close();
[+][-]12.30.2007 at 08:55PM PST, ID: 20553365

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[+][-]01.01.2008 at 01:17PM PST, ID: 20561431

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[+][-]01.01.2008 at 03:14PM PST, ID: 20561722

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[+][-]01.02.2008 at 12:54AM PST, ID: 20563254

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About this solution

Zones: PHP and Databases, PHP Scripting Language, MySQL Server
Tags: php
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Solution Provided By: schmavey
Participating Experts: 1
Solution Grade: B
 
 
[+][-]01.03.2008 at 04:15PM PST, ID: 20578541

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